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-rw-r--r--tests/appservice/test_appservice.py45
-rw-r--r--tests/events/test_utils.py5
-rw-r--r--tests/federation/test_federation_sender.py52
-rw-r--r--tests/handlers/test_appservice.py56
-rw-r--r--tests/rest/client/test_account.py290
-rw-r--r--tests/rest/client/test_filter.py29
-rw-r--r--tests/rest/client/test_relations.py465
-rw-r--r--tests/rest/client/test_report_event.py25
-rw-r--r--tests/rest/client/test_rooms.py271
-rw-r--r--tests/rest/client/test_third_party_rules.py108
-rw-r--r--tests/rest/client/test_typing.py39
-rw-r--r--tests/rest/key/v2/test_remote_key_resource.py44
-rw-r--r--tests/rest/media/v1/test_base.py4
-rw-r--r--tests/rest/media/v1/test_filepath.py48
-rw-r--r--tests/rest/media/v1/test_html_preview.py54
-rw-r--r--tests/rest/media/v1/test_oembed.py10
-rw-r--r--tests/rest/test_health.py8
-rw-r--r--tests/rest/test_well_known.py20
-rw-r--r--tests/test_visibility.py76
-rw-r--r--tests/util/test_async_helpers.py28
20 files changed, 916 insertions, 761 deletions
diff --git a/tests/appservice/test_appservice.py b/tests/appservice/test_appservice.py
index 9bd6275e92..edc584d0cf 100644
--- a/tests/appservice/test_appservice.py
+++ b/tests/appservice/test_appservice.py
@@ -36,7 +36,10 @@ class ApplicationServiceTestCase(unittest.TestCase):
             hostname="matrix.org",  # only used by get_groups_for_user
         )
         self.event = Mock(
-            type="m.something", room_id="!foo:bar", sender="@someone:somewhere"
+            event_id="$abc:xyz",
+            type="m.something",
+            room_id="!foo:bar",
+            sender="@someone:somewhere",
         )
 
         self.store = Mock()
@@ -50,7 +53,9 @@ class ApplicationServiceTestCase(unittest.TestCase):
         self.assertTrue(
             (
                 yield defer.ensureDeferred(
-                    self.service.is_interested(self.event, self.store)
+                    self.service.is_interested_in_event(
+                        self.event.event_id, self.event, self.store
+                    )
                 )
             )
         )
@@ -62,7 +67,9 @@ class ApplicationServiceTestCase(unittest.TestCase):
         self.assertFalse(
             (
                 yield defer.ensureDeferred(
-                    self.service.is_interested(self.event, self.store)
+                    self.service.is_interested_in_event(
+                        self.event.event_id, self.event, self.store
+                    )
                 )
             )
         )
@@ -76,7 +83,9 @@ class ApplicationServiceTestCase(unittest.TestCase):
         self.assertTrue(
             (
                 yield defer.ensureDeferred(
-                    self.service.is_interested(self.event, self.store)
+                    self.service.is_interested_in_event(
+                        self.event.event_id, self.event, self.store
+                    )
                 )
             )
         )
@@ -90,7 +99,9 @@ class ApplicationServiceTestCase(unittest.TestCase):
         self.assertTrue(
             (
                 yield defer.ensureDeferred(
-                    self.service.is_interested(self.event, self.store)
+                    self.service.is_interested_in_event(
+                        self.event.event_id, self.event, self.store
+                    )
                 )
             )
         )
@@ -104,7 +115,9 @@ class ApplicationServiceTestCase(unittest.TestCase):
         self.assertFalse(
             (
                 yield defer.ensureDeferred(
-                    self.service.is_interested(self.event, self.store)
+                    self.service.is_interested_in_event(
+                        self.event.event_id, self.event, self.store
+                    )
                 )
             )
         )
@@ -121,7 +134,9 @@ class ApplicationServiceTestCase(unittest.TestCase):
         self.assertTrue(
             (
                 yield defer.ensureDeferred(
-                    self.service.is_interested(self.event, self.store)
+                    self.service.is_interested_in_event(
+                        self.event.event_id, self.event, self.store
+                    )
                 )
             )
         )
@@ -174,7 +189,9 @@ class ApplicationServiceTestCase(unittest.TestCase):
         self.assertFalse(
             (
                 yield defer.ensureDeferred(
-                    self.service.is_interested(self.event, self.store)
+                    self.service.is_interested_in_event(
+                        self.event.event_id, self.event, self.store
+                    )
                 )
             )
         )
@@ -191,7 +208,9 @@ class ApplicationServiceTestCase(unittest.TestCase):
         self.assertTrue(
             (
                 yield defer.ensureDeferred(
-                    self.service.is_interested(self.event, self.store)
+                    self.service.is_interested_in_event(
+                        self.event.event_id, self.event, self.store
+                    )
                 )
             )
         )
@@ -207,7 +226,9 @@ class ApplicationServiceTestCase(unittest.TestCase):
         self.assertTrue(
             (
                 yield defer.ensureDeferred(
-                    self.service.is_interested(self.event, self.store)
+                    self.service.is_interested_in_event(
+                        self.event.event_id, self.event, self.store
+                    )
                 )
             )
         )
@@ -225,7 +246,9 @@ class ApplicationServiceTestCase(unittest.TestCase):
         self.assertTrue(
             (
                 yield defer.ensureDeferred(
-                    self.service.is_interested(event=self.event, store=self.store)
+                    self.service.is_interested_in_event(
+                        self.event.event_id, self.event, self.store
+                    )
                 )
             )
         )
diff --git a/tests/events/test_utils.py b/tests/events/test_utils.py
index 45e3395b33..00ad19e446 100644
--- a/tests/events/test_utils.py
+++ b/tests/events/test_utils.py
@@ -16,6 +16,7 @@ from synapse.api.constants import EventContentFields
 from synapse.api.room_versions import RoomVersions
 from synapse.events import make_event_from_dict
 from synapse.events.utils import (
+    SerializeEventConfig,
     copy_power_levels_contents,
     prune_event,
     serialize_event,
@@ -392,7 +393,9 @@ class PruneEventTestCase(unittest.TestCase):
 
 class SerializeEventTestCase(unittest.TestCase):
     def serialize(self, ev, fields):
-        return serialize_event(ev, 1479807801915, only_event_fields=fields)
+        return serialize_event(
+            ev, 1479807801915, config=SerializeEventConfig(only_event_fields=fields)
+        )
 
     def test_event_fields_works_with_keys(self):
         self.assertEqual(
diff --git a/tests/federation/test_federation_sender.py b/tests/federation/test_federation_sender.py
index 60e0c31f43..e90592855a 100644
--- a/tests/federation/test_federation_sender.py
+++ b/tests/federation/test_federation_sender.py
@@ -201,9 +201,12 @@ class FederationSenderDevicesTestCases(HomeserverTestCase):
         self.assertEqual(len(self.edus), 1)
         stream_id = self.check_device_update_edu(self.edus.pop(0), u1, "D1", None)
 
+        # We queue up device list updates to be sent over federation, so we
+        # advance to clear the queue.
+        self.reactor.advance(1)
+
         # a second call should produce no new device EDUs
         self.hs.get_federation_sender().send_device_messages("host2")
-        self.pump()
         self.assertEqual(self.edus, [])
 
         # a second device
@@ -232,6 +235,10 @@ class FederationSenderDevicesTestCases(HomeserverTestCase):
         device1_signing_key = self.generate_and_upload_device_signing_key(u1, "D1")
         device2_signing_key = self.generate_and_upload_device_signing_key(u1, "D2")
 
+        # We queue up device list updates to be sent over federation, so we
+        # advance to clear the queue.
+        self.reactor.advance(1)
+
         # expect two more edus
         self.assertEqual(len(self.edus), 2)
         stream_id = self.check_device_update_edu(self.edus.pop(0), u1, "D1", stream_id)
@@ -265,6 +272,10 @@ class FederationSenderDevicesTestCases(HomeserverTestCase):
             e2e_handler.upload_signing_keys_for_user(u1, cross_signing_keys)
         )
 
+        # We queue up device list updates to be sent over federation, so we
+        # advance to clear the queue.
+        self.reactor.advance(1)
+
         # expect signing key update edu
         self.assertEqual(len(self.edus), 2)
         self.assertEqual(self.edus.pop(0)["edu_type"], "m.signing_key_update")
@@ -284,6 +295,10 @@ class FederationSenderDevicesTestCases(HomeserverTestCase):
         )
         self.assertEqual(ret["failures"], {})
 
+        # We queue up device list updates to be sent over federation, so we
+        # advance to clear the queue.
+        self.reactor.advance(1)
+
         # expect two edus, in one or two transactions. We don't know what order the
         # devices will be updated.
         self.assertEqual(len(self.edus), 2)
@@ -307,6 +322,10 @@ class FederationSenderDevicesTestCases(HomeserverTestCase):
         self.login("user", "pass", device_id="D2")
         self.login("user", "pass", device_id="D3")
 
+        # We queue up device list updates to be sent over federation, so we
+        # advance to clear the queue.
+        self.reactor.advance(1)
+
         # expect three edus
         self.assertEqual(len(self.edus), 3)
         stream_id = self.check_device_update_edu(self.edus.pop(0), u1, "D1", None)
@@ -318,6 +337,10 @@ class FederationSenderDevicesTestCases(HomeserverTestCase):
             self.hs.get_device_handler().delete_devices(u1, ["D1", "D2", "D3"])
         )
 
+        # We queue up device list updates to be sent over federation, so we
+        # advance to clear the queue.
+        self.reactor.advance(1)
+
         # expect three edus, in an unknown order
         self.assertEqual(len(self.edus), 3)
         for edu in self.edus:
@@ -350,12 +373,19 @@ class FederationSenderDevicesTestCases(HomeserverTestCase):
             self.hs.get_device_handler().delete_devices(u1, ["D1", "D2", "D3"])
         )
 
+        # We queue up device list updates to be sent over federation, so we
+        # advance to clear the queue.
+        self.reactor.advance(1)
+
         self.assertGreaterEqual(mock_send_txn.call_count, 4)
 
         # recover the server
         mock_send_txn.side_effect = self.record_transaction
         self.hs.get_federation_sender().send_device_messages("host2")
-        self.pump()
+
+        # We queue up device list updates to be sent over federation, so we
+        # advance to clear the queue.
+        self.reactor.advance(1)
 
         # for each device, there should be a single update
         self.assertEqual(len(self.edus), 3)
@@ -390,6 +420,10 @@ class FederationSenderDevicesTestCases(HomeserverTestCase):
             self.hs.get_device_handler().delete_devices(u1, ["D1", "D2", "D3"])
         )
 
+        # We queue up device list updates to be sent over federation, so we
+        # advance to clear the queue.
+        self.reactor.advance(1)
+
         self.assertGreaterEqual(mock_send_txn.call_count, 4)
 
         # run the prune job
@@ -401,7 +435,10 @@ class FederationSenderDevicesTestCases(HomeserverTestCase):
         # recover the server
         mock_send_txn.side_effect = self.record_transaction
         self.hs.get_federation_sender().send_device_messages("host2")
-        self.pump()
+
+        # We queue up device list updates to be sent over federation, so we
+        # advance to clear the queue.
+        self.reactor.advance(1)
 
         # there should be a single update for this user.
         self.assertEqual(len(self.edus), 1)
@@ -435,6 +472,10 @@ class FederationSenderDevicesTestCases(HomeserverTestCase):
         self.login("user", "pass", device_id="D2")
         self.login("user", "pass", device_id="D3")
 
+        # We queue up device list updates to be sent over federation, so we
+        # advance to clear the queue.
+        self.reactor.advance(1)
+
         # delete them again
         self.get_success(
             self.hs.get_device_handler().delete_devices(u1, ["D1", "D2", "D3"])
@@ -451,7 +492,10 @@ class FederationSenderDevicesTestCases(HomeserverTestCase):
         # recover the server
         mock_send_txn.side_effect = self.record_transaction
         self.hs.get_federation_sender().send_device_messages("host2")
-        self.pump()
+
+        # We queue up device list updates to be sent over federation, so we
+        # advance to clear the queue.
+        self.reactor.advance(1)
 
         # ... and we should get a single update for this user.
         self.assertEqual(len(self.edus), 1)
diff --git a/tests/handlers/test_appservice.py b/tests/handlers/test_appservice.py
index 072e6bbcdd..cead9f90df 100644
--- a/tests/handlers/test_appservice.py
+++ b/tests/handlers/test_appservice.py
@@ -59,11 +59,11 @@ class AppServiceHandlerTestCase(unittest.TestCase):
         self.event_source = hs.get_event_sources()
 
     def test_notify_interested_services(self):
-        interested_service = self._mkservice(is_interested=True)
+        interested_service = self._mkservice(is_interested_in_event=True)
         services = [
-            self._mkservice(is_interested=False),
+            self._mkservice(is_interested_in_event=False),
             interested_service,
-            self._mkservice(is_interested=False),
+            self._mkservice(is_interested_in_event=False),
         ]
 
         self.mock_as_api.query_user.return_value = make_awaitable(True)
@@ -85,7 +85,7 @@ class AppServiceHandlerTestCase(unittest.TestCase):
 
     def test_query_user_exists_unknown_user(self):
         user_id = "@someone:anywhere"
-        services = [self._mkservice(is_interested=True)]
+        services = [self._mkservice(is_interested_in_event=True)]
         services[0].is_interested_in_user.return_value = True
         self.mock_store.get_app_services.return_value = services
         self.mock_store.get_user_by_id.return_value = make_awaitable(None)
@@ -102,7 +102,7 @@ class AppServiceHandlerTestCase(unittest.TestCase):
 
     def test_query_user_exists_known_user(self):
         user_id = "@someone:anywhere"
-        services = [self._mkservice(is_interested=True)]
+        services = [self._mkservice(is_interested_in_event=True)]
         services[0].is_interested_in_user.return_value = True
         self.mock_store.get_app_services.return_value = services
         self.mock_store.get_user_by_id.return_value = make_awaitable({"name": user_id})
@@ -127,11 +127,11 @@ class AppServiceHandlerTestCase(unittest.TestCase):
 
         room_id = "!alpha:bet"
         servers = ["aperture"]
-        interested_service = self._mkservice_alias(is_interested_in_alias=True)
+        interested_service = self._mkservice_alias(is_room_alias_in_namespace=True)
         services = [
-            self._mkservice_alias(is_interested_in_alias=False),
+            self._mkservice_alias(is_room_alias_in_namespace=False),
             interested_service,
-            self._mkservice_alias(is_interested_in_alias=False),
+            self._mkservice_alias(is_room_alias_in_namespace=False),
         ]
 
         self.mock_as_api.query_alias.return_value = make_awaitable(True)
@@ -275,7 +275,7 @@ class AppServiceHandlerTestCase(unittest.TestCase):
         to be pushed out to interested appservices, and that the stream ID is
         updated accordingly.
         """
-        interested_service = self._mkservice(is_interested=True)
+        interested_service = self._mkservice(is_interested_in_event=True)
         services = [interested_service]
         self.mock_store.get_app_services.return_value = services
         self.mock_store.get_type_stream_id_for_appservice.return_value = make_awaitable(
@@ -304,7 +304,7 @@ class AppServiceHandlerTestCase(unittest.TestCase):
         Test sending out of order ephemeral events to the appservice handler
         are ignored.
         """
-        interested_service = self._mkservice(is_interested=True)
+        interested_service = self._mkservice(is_interested_in_event=True)
         services = [interested_service]
 
         self.mock_store.get_app_services.return_value = services
@@ -325,17 +325,45 @@ class AppServiceHandlerTestCase(unittest.TestCase):
             interested_service, ephemeral=[]
         )
 
-    def _mkservice(self, is_interested, protocols=None):
+    def _mkservice(
+        self, is_interested_in_event: bool, protocols: Optional[Iterable] = None
+    ) -> Mock:
+        """
+        Create a new mock representing an ApplicationService.
+
+        Args:
+            is_interested_in_event: Whether this application service will be considered
+                interested in all events.
+            protocols: The third-party protocols that this application service claims to
+                support.
+
+        Returns:
+            A mock representing the ApplicationService.
+        """
         service = Mock()
-        service.is_interested.return_value = make_awaitable(is_interested)
+        service.is_interested_in_event.return_value = make_awaitable(
+            is_interested_in_event
+        )
         service.token = "mock_service_token"
         service.url = "mock_service_url"
         service.protocols = protocols
         return service
 
-    def _mkservice_alias(self, is_interested_in_alias):
+    def _mkservice_alias(self, is_room_alias_in_namespace: bool) -> Mock:
+        """
+        Create a new mock representing an ApplicationService that is or is not interested
+        any given room aliase.
+
+        Args:
+            is_room_alias_in_namespace: If true, the application service will be interested
+                in all room aliases that are queried against it. If false, the application
+                service will not be interested in any room aliases.
+
+        Returns:
+            A mock representing the ApplicationService.
+        """
         service = Mock()
-        service.is_interested_in_alias.return_value = is_interested_in_alias
+        service.is_room_alias_in_namespace.return_value = is_room_alias_in_namespace
         service.token = "mock_service_token"
         service.url = "mock_service_url"
         return service
diff --git a/tests/rest/client/test_account.py b/tests/rest/client/test_account.py
index 6c4462e74a..def836054d 100644
--- a/tests/rest/client/test_account.py
+++ b/tests/rest/client/test_account.py
@@ -15,11 +15,12 @@ import json
 import os
 import re
 from email.parser import Parser
-from typing import Dict, List, Optional
+from typing import Any, Dict, List, Optional, Union
 from unittest.mock import Mock
 
 import pkg_resources
 
+from twisted.internet.interfaces import IReactorTCP
 from twisted.test.proto_helpers import MemoryReactor
 
 import synapse.rest.admin
@@ -30,6 +31,7 @@ from synapse.rest import admin
 from synapse.rest.client import account, login, register, room
 from synapse.rest.synapse.client.password_reset import PasswordResetSubmitTokenResource
 from synapse.server import HomeServer
+from synapse.types import JsonDict
 from synapse.util import Clock
 
 from tests import unittest
@@ -46,7 +48,7 @@ class PasswordResetTestCase(unittest.HomeserverTestCase):
         login.register_servlets,
     ]
 
-    def make_homeserver(self, reactor, clock):
+    def make_homeserver(self, reactor: MemoryReactor, clock: Clock) -> HomeServer:
         config = self.default_config()
 
         # Email config.
@@ -67,20 +69,27 @@ class PasswordResetTestCase(unittest.HomeserverTestCase):
         hs = self.setup_test_homeserver(config=config)
 
         async def sendmail(
-            reactor, smtphost, smtpport, from_addr, to_addrs, msg, **kwargs
-        ):
-            self.email_attempts.append(msg)
-
-        self.email_attempts = []
+            reactor: IReactorTCP,
+            smtphost: str,
+            smtpport: int,
+            from_addr: str,
+            to_addr: str,
+            msg_bytes: bytes,
+            *args: Any,
+            **kwargs: Any,
+        ) -> None:
+            self.email_attempts.append(msg_bytes)
+
+        self.email_attempts: List[bytes] = []
         hs.get_send_email_handler()._sendmail = sendmail
 
         return hs
 
-    def prepare(self, reactor, clock, hs):
+    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
         self.store = hs.get_datastores().main
         self.submit_token_resource = PasswordResetSubmitTokenResource(hs)
 
-    def test_basic_password_reset(self):
+    def test_basic_password_reset(self) -> None:
         """Test basic password reset flow"""
         old_password = "monkey"
         new_password = "kangeroo"
@@ -118,7 +127,7 @@ class PasswordResetTestCase(unittest.HomeserverTestCase):
         self.attempt_wrong_password_login("kermit", old_password)
 
     @override_config({"rc_3pid_validation": {"burst_count": 3}})
-    def test_ratelimit_by_email(self):
+    def test_ratelimit_by_email(self) -> None:
         """Test that we ratelimit /requestToken for the same email."""
         old_password = "monkey"
         new_password = "kangeroo"
@@ -139,7 +148,7 @@ class PasswordResetTestCase(unittest.HomeserverTestCase):
             )
         )
 
-        def reset(ip):
+        def reset(ip: str) -> None:
             client_secret = "foobar"
             session_id = self._request_token(email, client_secret, ip)
 
@@ -166,7 +175,7 @@ class PasswordResetTestCase(unittest.HomeserverTestCase):
 
         self.assertEqual(cm.exception.code, 429)
 
-    def test_basic_password_reset_canonicalise_email(self):
+    def test_basic_password_reset_canonicalise_email(self) -> None:
         """Test basic password reset flow
         Request password reset with different spelling
         """
@@ -206,7 +215,7 @@ class PasswordResetTestCase(unittest.HomeserverTestCase):
         # Assert we can't log in with the old password
         self.attempt_wrong_password_login("kermit", old_password)
 
-    def test_cant_reset_password_without_clicking_link(self):
+    def test_cant_reset_password_without_clicking_link(self) -> None:
         """Test that we do actually need to click the link in the email"""
         old_password = "monkey"
         new_password = "kangeroo"
@@ -241,7 +250,7 @@ class PasswordResetTestCase(unittest.HomeserverTestCase):
         # Assert we can't log in with the new password
         self.attempt_wrong_password_login("kermit", new_password)
 
-    def test_no_valid_token(self):
+    def test_no_valid_token(self) -> None:
         """Test that we do actually need to request a token and can't just
         make a session up.
         """
@@ -277,7 +286,7 @@ class PasswordResetTestCase(unittest.HomeserverTestCase):
         self.attempt_wrong_password_login("kermit", new_password)
 
     @unittest.override_config({"request_token_inhibit_3pid_errors": True})
-    def test_password_reset_bad_email_inhibit_error(self):
+    def test_password_reset_bad_email_inhibit_error(self) -> None:
         """Test that triggering a password reset with an email address that isn't bound
         to an account doesn't leak the lack of binding for that address if configured
         that way.
@@ -292,7 +301,12 @@ class PasswordResetTestCase(unittest.HomeserverTestCase):
 
         self.assertIsNotNone(session_id)
 
-    def _request_token(self, email, client_secret, ip="127.0.0.1"):
+    def _request_token(
+        self,
+        email: str,
+        client_secret: str,
+        ip: str = "127.0.0.1",
+    ) -> str:
         channel = self.make_request(
             "POST",
             b"account/password/email/requestToken",
@@ -309,7 +323,7 @@ class PasswordResetTestCase(unittest.HomeserverTestCase):
 
         return channel.json_body["sid"]
 
-    def _validate_token(self, link):
+    def _validate_token(self, link: str) -> None:
         # Remove the host
         path = link.replace("https://example.com", "")
 
@@ -339,7 +353,7 @@ class PasswordResetTestCase(unittest.HomeserverTestCase):
         )
         self.assertEqual(200, channel.code, channel.result)
 
-    def _get_link_from_email(self):
+    def _get_link_from_email(self) -> str:
         assert self.email_attempts, "No emails have been sent"
 
         raw_msg = self.email_attempts[-1].decode("UTF-8")
@@ -354,14 +368,19 @@ class PasswordResetTestCase(unittest.HomeserverTestCase):
         if not text:
             self.fail("Could not find text portion of email to parse")
 
+        assert text is not None
         match = re.search(r"https://example.com\S+", text)
         assert match, "Could not find link in email"
 
         return match.group(0)
 
     def _reset_password(
-        self, new_password, session_id, client_secret, expected_code=200
-    ):
+        self,
+        new_password: str,
+        session_id: str,
+        client_secret: str,
+        expected_code: int = 200,
+    ) -> None:
         channel = self.make_request(
             "POST",
             b"account/password",
@@ -388,11 +407,11 @@ class DeactivateTestCase(unittest.HomeserverTestCase):
         room.register_servlets,
     ]
 
-    def make_homeserver(self, reactor, clock):
+    def make_homeserver(self, reactor: MemoryReactor, clock: Clock) -> HomeServer:
         self.hs = self.setup_test_homeserver()
         return self.hs
 
-    def test_deactivate_account(self):
+    def test_deactivate_account(self) -> None:
         user_id = self.register_user("kermit", "test")
         tok = self.login("kermit", "test")
 
@@ -407,7 +426,7 @@ class DeactivateTestCase(unittest.HomeserverTestCase):
         channel = self.make_request("GET", "account/whoami", access_token=tok)
         self.assertEqual(channel.code, 401)
 
-    def test_pending_invites(self):
+    def test_pending_invites(self) -> None:
         """Tests that deactivating a user rejects every pending invite for them."""
         store = self.hs.get_datastores().main
 
@@ -448,7 +467,7 @@ class DeactivateTestCase(unittest.HomeserverTestCase):
         self.assertEqual(len(memberships), 1, memberships)
         self.assertEqual(memberships[0].room_id, room_id, memberships)
 
-    def deactivate(self, user_id, tok):
+    def deactivate(self, user_id: str, tok: str) -> None:
         request_data = json.dumps(
             {
                 "auth": {
@@ -474,12 +493,12 @@ class WhoamiTestCase(unittest.HomeserverTestCase):
         register.register_servlets,
     ]
 
-    def default_config(self):
+    def default_config(self) -> Dict[str, Any]:
         config = super().default_config()
         config["allow_guest_access"] = True
         return config
 
-    def test_GET_whoami(self):
+    def test_GET_whoami(self) -> None:
         device_id = "wouldgohere"
         user_id = self.register_user("kermit", "test")
         tok = self.login("kermit", "test", device_id=device_id)
@@ -496,7 +515,7 @@ class WhoamiTestCase(unittest.HomeserverTestCase):
             },
         )
 
-    def test_GET_whoami_guests(self):
+    def test_GET_whoami_guests(self) -> None:
         channel = self.make_request(
             b"POST", b"/_matrix/client/r0/register?kind=guest", b"{}"
         )
@@ -516,7 +535,7 @@ class WhoamiTestCase(unittest.HomeserverTestCase):
             },
         )
 
-    def test_GET_whoami_appservices(self):
+    def test_GET_whoami_appservices(self) -> None:
         user_id = "@as:test"
         as_token = "i_am_an_app_service"
 
@@ -541,7 +560,7 @@ class WhoamiTestCase(unittest.HomeserverTestCase):
         )
         self.assertFalse(hasattr(whoami, "device_id"))
 
-    def _whoami(self, tok):
+    def _whoami(self, tok: str) -> JsonDict:
         channel = self.make_request("GET", "account/whoami", {}, access_token=tok)
         self.assertEqual(channel.code, 200)
         return channel.json_body
@@ -555,7 +574,7 @@ class ThreepidEmailRestTestCase(unittest.HomeserverTestCase):
         synapse.rest.admin.register_servlets_for_client_rest_resource,
     ]
 
-    def make_homeserver(self, reactor, clock):
+    def make_homeserver(self, reactor: MemoryReactor, clock: Clock) -> HomeServer:
         config = self.default_config()
 
         # Email config.
@@ -576,16 +595,23 @@ class ThreepidEmailRestTestCase(unittest.HomeserverTestCase):
         self.hs = self.setup_test_homeserver(config=config)
 
         async def sendmail(
-            reactor, smtphost, smtpport, from_addr, to_addrs, msg, **kwargs
-        ):
-            self.email_attempts.append(msg)
-
-        self.email_attempts = []
+            reactor: IReactorTCP,
+            smtphost: str,
+            smtpport: int,
+            from_addr: str,
+            to_addr: str,
+            msg_bytes: bytes,
+            *args: Any,
+            **kwargs: Any,
+        ) -> None:
+            self.email_attempts.append(msg_bytes)
+
+        self.email_attempts: List[bytes] = []
         self.hs.get_send_email_handler()._sendmail = sendmail
 
         return self.hs
 
-    def prepare(self, reactor, clock, hs):
+    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
         self.store = hs.get_datastores().main
 
         self.user_id = self.register_user("kermit", "test")
@@ -593,83 +619,73 @@ class ThreepidEmailRestTestCase(unittest.HomeserverTestCase):
         self.email = "test@example.com"
         self.url_3pid = b"account/3pid"
 
-    def test_add_valid_email(self):
-        self.get_success(self._add_email(self.email, self.email))
+    def test_add_valid_email(self) -> None:
+        self._add_email(self.email, self.email)
 
-    def test_add_valid_email_second_time(self):
-        self.get_success(self._add_email(self.email, self.email))
-        self.get_success(
-            self._request_token_invalid_email(
-                self.email,
-                expected_errcode=Codes.THREEPID_IN_USE,
-                expected_error="Email is already in use",
-            )
+    def test_add_valid_email_second_time(self) -> None:
+        self._add_email(self.email, self.email)
+        self._request_token_invalid_email(
+            self.email,
+            expected_errcode=Codes.THREEPID_IN_USE,
+            expected_error="Email is already in use",
         )
 
-    def test_add_valid_email_second_time_canonicalise(self):
-        self.get_success(self._add_email(self.email, self.email))
-        self.get_success(
-            self._request_token_invalid_email(
-                "TEST@EXAMPLE.COM",
-                expected_errcode=Codes.THREEPID_IN_USE,
-                expected_error="Email is already in use",
-            )
+    def test_add_valid_email_second_time_canonicalise(self) -> None:
+        self._add_email(self.email, self.email)
+        self._request_token_invalid_email(
+            "TEST@EXAMPLE.COM",
+            expected_errcode=Codes.THREEPID_IN_USE,
+            expected_error="Email is already in use",
         )
 
-    def test_add_email_no_at(self):
-        self.get_success(
-            self._request_token_invalid_email(
-                "address-without-at.bar",
-                expected_errcode=Codes.UNKNOWN,
-                expected_error="Unable to parse email address",
-            )
+    def test_add_email_no_at(self) -> None:
+        self._request_token_invalid_email(
+            "address-without-at.bar",
+            expected_errcode=Codes.UNKNOWN,
+            expected_error="Unable to parse email address",
         )
 
-    def test_add_email_two_at(self):
-        self.get_success(
-            self._request_token_invalid_email(
-                "foo@foo@test.bar",
-                expected_errcode=Codes.UNKNOWN,
-                expected_error="Unable to parse email address",
-            )
+    def test_add_email_two_at(self) -> None:
+        self._request_token_invalid_email(
+            "foo@foo@test.bar",
+            expected_errcode=Codes.UNKNOWN,
+            expected_error="Unable to parse email address",
         )
 
-    def test_add_email_bad_format(self):
-        self.get_success(
-            self._request_token_invalid_email(
-                "user@bad.example.net@good.example.com",
-                expected_errcode=Codes.UNKNOWN,
-                expected_error="Unable to parse email address",
-            )
+    def test_add_email_bad_format(self) -> None:
+        self._request_token_invalid_email(
+            "user@bad.example.net@good.example.com",
+            expected_errcode=Codes.UNKNOWN,
+            expected_error="Unable to parse email address",
         )
 
-    def test_add_email_domain_to_lower(self):
-        self.get_success(self._add_email("foo@TEST.BAR", "foo@test.bar"))
+    def test_add_email_domain_to_lower(self) -> None:
+        self._add_email("foo@TEST.BAR", "foo@test.bar")
 
-    def test_add_email_domain_with_umlaut(self):
-        self.get_success(self._add_email("foo@Öumlaut.com", "foo@öumlaut.com"))
+    def test_add_email_domain_with_umlaut(self) -> None:
+        self._add_email("foo@Öumlaut.com", "foo@öumlaut.com")
 
-    def test_add_email_address_casefold(self):
-        self.get_success(self._add_email("Strauß@Example.com", "strauss@example.com"))
+    def test_add_email_address_casefold(self) -> None:
+        self._add_email("Strauß@Example.com", "strauss@example.com")
 
-    def test_address_trim(self):
-        self.get_success(self._add_email(" foo@test.bar ", "foo@test.bar"))
+    def test_address_trim(self) -> None:
+        self._add_email(" foo@test.bar ", "foo@test.bar")
 
     @override_config({"rc_3pid_validation": {"burst_count": 3}})
-    def test_ratelimit_by_ip(self):
+    def test_ratelimit_by_ip(self) -> None:
         """Tests that adding emails is ratelimited by IP"""
 
         # We expect to be able to set three emails before getting ratelimited.
-        self.get_success(self._add_email("foo1@test.bar", "foo1@test.bar"))
-        self.get_success(self._add_email("foo2@test.bar", "foo2@test.bar"))
-        self.get_success(self._add_email("foo3@test.bar", "foo3@test.bar"))
+        self._add_email("foo1@test.bar", "foo1@test.bar")
+        self._add_email("foo2@test.bar", "foo2@test.bar")
+        self._add_email("foo3@test.bar", "foo3@test.bar")
 
         with self.assertRaises(HttpResponseException) as cm:
-            self.get_success(self._add_email("foo4@test.bar", "foo4@test.bar"))
+            self._add_email("foo4@test.bar", "foo4@test.bar")
 
         self.assertEqual(cm.exception.code, 429)
 
-    def test_add_email_if_disabled(self):
+    def test_add_email_if_disabled(self) -> None:
         """Test adding email to profile when doing so is disallowed"""
         self.hs.config.registration.enable_3pid_changes = False
 
@@ -695,7 +711,7 @@ class ThreepidEmailRestTestCase(unittest.HomeserverTestCase):
             },
             access_token=self.user_id_tok,
         )
-        self.assertEqual(400, int(channel.result["code"]), msg=channel.result["body"])
+        self.assertEqual(400, channel.code, msg=channel.result["body"])
         self.assertEqual(Codes.FORBIDDEN, channel.json_body["errcode"])
 
         # Get user
@@ -705,10 +721,10 @@ class ThreepidEmailRestTestCase(unittest.HomeserverTestCase):
             access_token=self.user_id_tok,
         )
 
-        self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"])
+        self.assertEqual(200, channel.code, msg=channel.result["body"])
         self.assertFalse(channel.json_body["threepids"])
 
-    def test_delete_email(self):
+    def test_delete_email(self) -> None:
         """Test deleting an email from profile"""
         # Add a threepid
         self.get_success(
@@ -727,7 +743,7 @@ class ThreepidEmailRestTestCase(unittest.HomeserverTestCase):
             {"medium": "email", "address": self.email},
             access_token=self.user_id_tok,
         )
-        self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"])
+        self.assertEqual(200, channel.code, msg=channel.result["body"])
 
         # Get user
         channel = self.make_request(
@@ -736,10 +752,10 @@ class ThreepidEmailRestTestCase(unittest.HomeserverTestCase):
             access_token=self.user_id_tok,
         )
 
-        self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"])
+        self.assertEqual(200, channel.code, msg=channel.result["body"])
         self.assertFalse(channel.json_body["threepids"])
 
-    def test_delete_email_if_disabled(self):
+    def test_delete_email_if_disabled(self) -> None:
         """Test deleting an email from profile when disallowed"""
         self.hs.config.registration.enable_3pid_changes = False
 
@@ -761,7 +777,7 @@ class ThreepidEmailRestTestCase(unittest.HomeserverTestCase):
             access_token=self.user_id_tok,
         )
 
-        self.assertEqual(400, int(channel.result["code"]), msg=channel.result["body"])
+        self.assertEqual(400, channel.code, msg=channel.result["body"])
         self.assertEqual(Codes.FORBIDDEN, channel.json_body["errcode"])
 
         # Get user
@@ -771,11 +787,11 @@ class ThreepidEmailRestTestCase(unittest.HomeserverTestCase):
             access_token=self.user_id_tok,
         )
 
-        self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"])
+        self.assertEqual(200, channel.code, msg=channel.result["body"])
         self.assertEqual("email", channel.json_body["threepids"][0]["medium"])
         self.assertEqual(self.email, channel.json_body["threepids"][0]["address"])
 
-    def test_cant_add_email_without_clicking_link(self):
+    def test_cant_add_email_without_clicking_link(self) -> None:
         """Test that we do actually need to click the link in the email"""
         client_secret = "foobar"
         session_id = self._request_token(self.email, client_secret)
@@ -797,7 +813,7 @@ class ThreepidEmailRestTestCase(unittest.HomeserverTestCase):
             },
             access_token=self.user_id_tok,
         )
-        self.assertEqual(400, int(channel.result["code"]), msg=channel.result["body"])
+        self.assertEqual(400, channel.code, msg=channel.result["body"])
         self.assertEqual(Codes.THREEPID_AUTH_FAILED, channel.json_body["errcode"])
 
         # Get user
@@ -807,10 +823,10 @@ class ThreepidEmailRestTestCase(unittest.HomeserverTestCase):
             access_token=self.user_id_tok,
         )
 
-        self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"])
+        self.assertEqual(200, channel.code, msg=channel.result["body"])
         self.assertFalse(channel.json_body["threepids"])
 
-    def test_no_valid_token(self):
+    def test_no_valid_token(self) -> None:
         """Test that we do actually need to request a token and can't just
         make a session up.
         """
@@ -832,7 +848,7 @@ class ThreepidEmailRestTestCase(unittest.HomeserverTestCase):
             },
             access_token=self.user_id_tok,
         )
-        self.assertEqual(400, int(channel.result["code"]), msg=channel.result["body"])
+        self.assertEqual(400, channel.code, msg=channel.result["body"])
         self.assertEqual(Codes.THREEPID_AUTH_FAILED, channel.json_body["errcode"])
 
         # Get user
@@ -842,11 +858,11 @@ class ThreepidEmailRestTestCase(unittest.HomeserverTestCase):
             access_token=self.user_id_tok,
         )
 
-        self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"])
+        self.assertEqual(200, channel.code, msg=channel.result["body"])
         self.assertFalse(channel.json_body["threepids"])
 
     @override_config({"next_link_domain_whitelist": None})
-    def test_next_link(self):
+    def test_next_link(self) -> None:
         """Tests a valid next_link parameter value with no whitelist (good case)"""
         self._request_token(
             "something@example.com",
@@ -856,7 +872,7 @@ class ThreepidEmailRestTestCase(unittest.HomeserverTestCase):
         )
 
     @override_config({"next_link_domain_whitelist": None})
-    def test_next_link_exotic_protocol(self):
+    def test_next_link_exotic_protocol(self) -> None:
         """Tests using a esoteric protocol as a next_link parameter value.
         Someone may be hosting a client on IPFS etc.
         """
@@ -868,7 +884,7 @@ class ThreepidEmailRestTestCase(unittest.HomeserverTestCase):
         )
 
     @override_config({"next_link_domain_whitelist": None})
-    def test_next_link_file_uri(self):
+    def test_next_link_file_uri(self) -> None:
         """Tests next_link parameters cannot be file URI"""
         # Attempt to use a next_link value that points to the local disk
         self._request_token(
@@ -879,7 +895,7 @@ class ThreepidEmailRestTestCase(unittest.HomeserverTestCase):
         )
 
     @override_config({"next_link_domain_whitelist": ["example.com", "example.org"]})
-    def test_next_link_domain_whitelist(self):
+    def test_next_link_domain_whitelist(self) -> None:
         """Tests next_link parameters must fit the whitelist if provided"""
 
         # Ensure not providing a next_link parameter still works
@@ -912,7 +928,7 @@ class ThreepidEmailRestTestCase(unittest.HomeserverTestCase):
         )
 
     @override_config({"next_link_domain_whitelist": []})
-    def test_empty_next_link_domain_whitelist(self):
+    def test_empty_next_link_domain_whitelist(self) -> None:
         """Tests an empty next_lint_domain_whitelist value, meaning next_link is essentially
         disallowed
         """
@@ -962,28 +978,28 @@ class ThreepidEmailRestTestCase(unittest.HomeserverTestCase):
 
     def _request_token_invalid_email(
         self,
-        email,
-        expected_errcode,
-        expected_error,
-        client_secret="foobar",
-    ):
+        email: str,
+        expected_errcode: str,
+        expected_error: str,
+        client_secret: str = "foobar",
+    ) -> None:
         channel = self.make_request(
             "POST",
             b"account/3pid/email/requestToken",
             {"client_secret": client_secret, "email": email, "send_attempt": 1},
         )
-        self.assertEqual(400, int(channel.result["code"]), msg=channel.result["body"])
+        self.assertEqual(400, channel.code, msg=channel.result["body"])
         self.assertEqual(expected_errcode, channel.json_body["errcode"])
         self.assertEqual(expected_error, channel.json_body["error"])
 
-    def _validate_token(self, link):
+    def _validate_token(self, link: str) -> None:
         # Remove the host
         path = link.replace("https://example.com", "")
 
         channel = self.make_request("GET", path, shorthand=False)
         self.assertEqual(200, channel.code, channel.result)
 
-    def _get_link_from_email(self):
+    def _get_link_from_email(self) -> str:
         assert self.email_attempts, "No emails have been sent"
 
         raw_msg = self.email_attempts[-1].decode("UTF-8")
@@ -998,12 +1014,13 @@ class ThreepidEmailRestTestCase(unittest.HomeserverTestCase):
         if not text:
             self.fail("Could not find text portion of email to parse")
 
+        assert text is not None
         match = re.search(r"https://example.com\S+", text)
         assert match, "Could not find link in email"
 
         return match.group(0)
 
-    def _add_email(self, request_email, expected_email):
+    def _add_email(self, request_email: str, expected_email: str) -> None:
         """Test adding an email to profile"""
         previous_email_attempts = len(self.email_attempts)
 
@@ -1030,7 +1047,7 @@ class ThreepidEmailRestTestCase(unittest.HomeserverTestCase):
             access_token=self.user_id_tok,
         )
 
-        self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"])
+        self.assertEqual(200, channel.code, msg=channel.result["body"])
 
         # Get user
         channel = self.make_request(
@@ -1039,7 +1056,7 @@ class ThreepidEmailRestTestCase(unittest.HomeserverTestCase):
             access_token=self.user_id_tok,
         )
 
-        self.assertEqual(200, int(channel.result["code"]), msg=channel.result["body"])
+        self.assertEqual(200, channel.code, msg=channel.result["body"])
         self.assertEqual("email", channel.json_body["threepids"][0]["medium"])
 
         threepids = {threepid["address"] for threepid in channel.json_body["threepids"]}
@@ -1055,18 +1072,18 @@ class AccountStatusTestCase(unittest.HomeserverTestCase):
 
     url = "/_matrix/client/unstable/org.matrix.msc3720/account_status"
 
-    def make_homeserver(self, reactor, clock):
+    def make_homeserver(self, reactor: MemoryReactor, clock: Clock) -> HomeServer:
         config = self.default_config()
         config["experimental_features"] = {"msc3720_enabled": True}
 
         return self.setup_test_homeserver(config=config)
 
-    def prepare(self, reactor: MemoryReactor, clock: Clock, homeserver: HomeServer):
+    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
         self.requester = self.register_user("requester", "password")
         self.requester_tok = self.login("requester", "password")
-        self.server_name = homeserver.config.server.server_name
+        self.server_name = hs.config.server.server_name
 
-    def test_missing_mxid(self):
+    def test_missing_mxid(self) -> None:
         """Tests that not providing any MXID raises an error."""
         self._test_status(
             users=None,
@@ -1074,7 +1091,7 @@ class AccountStatusTestCase(unittest.HomeserverTestCase):
             expected_errcode=Codes.MISSING_PARAM,
         )
 
-    def test_invalid_mxid(self):
+    def test_invalid_mxid(self) -> None:
         """Tests that providing an invalid MXID raises an error."""
         self._test_status(
             users=["bad:test"],
@@ -1082,7 +1099,7 @@ class AccountStatusTestCase(unittest.HomeserverTestCase):
             expected_errcode=Codes.INVALID_PARAM,
         )
 
-    def test_local_user_not_exists(self):
+    def test_local_user_not_exists(self) -> None:
         """Tests that the account status endpoints correctly reports that a user doesn't
         exist.
         """
@@ -1098,7 +1115,7 @@ class AccountStatusTestCase(unittest.HomeserverTestCase):
             expected_failures=[],
         )
 
-    def test_local_user_exists(self):
+    def test_local_user_exists(self) -> None:
         """Tests that the account status endpoint correctly reports that a user doesn't
         exist.
         """
@@ -1115,7 +1132,7 @@ class AccountStatusTestCase(unittest.HomeserverTestCase):
             expected_failures=[],
         )
 
-    def test_local_user_deactivated(self):
+    def test_local_user_deactivated(self) -> None:
         """Tests that the account status endpoint correctly reports a deactivated user."""
         user = self.register_user("someuser", "password")
         self.get_success(
@@ -1135,7 +1152,7 @@ class AccountStatusTestCase(unittest.HomeserverTestCase):
             expected_failures=[],
         )
 
-    def test_mixed_local_and_remote_users(self):
+    def test_mixed_local_and_remote_users(self) -> None:
         """Tests that if some users are remote the account status endpoint correctly
         merges the remote responses with the local result.
         """
@@ -1150,7 +1167,13 @@ class AccountStatusTestCase(unittest.HomeserverTestCase):
             "@bad:badremote",
         ]
 
-        async def post_json(destination, path, data, *a, **kwa):
+        async def post_json(
+            destination: str,
+            path: str,
+            data: Optional[JsonDict] = None,
+            *a: Any,
+            **kwa: Any,
+        ) -> Union[JsonDict, list]:
             if destination == "remote":
                 return {
                     "account_statuses": {
@@ -1160,9 +1183,7 @@ class AccountStatusTestCase(unittest.HomeserverTestCase):
                         },
                     }
                 }
-            if destination == "otherremote":
-                return {}
-            if destination == "badremote":
+            elif destination == "badremote":
                 # badremote tries to overwrite the status of a user that doesn't belong
                 # to it (i.e. users[1]) with false data, which Synapse is expected to
                 # ignore.
@@ -1176,6 +1197,9 @@ class AccountStatusTestCase(unittest.HomeserverTestCase):
                         },
                     }
                 }
+            # if destination == "otherremote"
+            else:
+                return {}
 
         # Register a mock that will return the expected result depending on the remote.
         self.hs.get_federation_http_client().post_json = Mock(side_effect=post_json)
@@ -1205,7 +1229,7 @@ class AccountStatusTestCase(unittest.HomeserverTestCase):
         expected_statuses: Optional[Dict[str, Dict[str, bool]]] = None,
         expected_failures: Optional[List[str]] = None,
         expected_errcode: Optional[str] = None,
-    ):
+    ) -> None:
         """Send a request to the account status endpoint and check that the response
         matches with what's expected.
 
diff --git a/tests/rest/client/test_filter.py b/tests/rest/client/test_filter.py
index 5c31a54421..823e8ab8c4 100644
--- a/tests/rest/client/test_filter.py
+++ b/tests/rest/client/test_filter.py
@@ -12,10 +12,12 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from twisted.internet import defer
+from twisted.test.proto_helpers import MemoryReactor
 
 from synapse.api.errors import Codes
 from synapse.rest.client import filter
+from synapse.server import HomeServer
+from synapse.util import Clock
 
 from tests import unittest
 
@@ -30,11 +32,11 @@ class FilterTestCase(unittest.HomeserverTestCase):
     EXAMPLE_FILTER_JSON = b'{"room": {"timeline": {"types": ["m.room.message"]}}}'
     servlets = [filter.register_servlets]
 
-    def prepare(self, reactor, clock, hs):
+    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
         self.filtering = hs.get_filtering()
         self.store = hs.get_datastores().main
 
-    def test_add_filter(self):
+    def test_add_filter(self) -> None:
         channel = self.make_request(
             "POST",
             "/_matrix/client/r0/user/%s/filter" % (self.user_id),
@@ -43,11 +45,13 @@ class FilterTestCase(unittest.HomeserverTestCase):
 
         self.assertEqual(channel.result["code"], b"200")
         self.assertEqual(channel.json_body, {"filter_id": "0"})
-        filter = self.store.get_user_filter(user_localpart="apple", filter_id=0)
+        filter = self.get_success(
+            self.store.get_user_filter(user_localpart="apple", filter_id=0)
+        )
         self.pump()
-        self.assertEqual(filter.result, self.EXAMPLE_FILTER)
+        self.assertEqual(filter, self.EXAMPLE_FILTER)
 
-    def test_add_filter_for_other_user(self):
+    def test_add_filter_for_other_user(self) -> None:
         channel = self.make_request(
             "POST",
             "/_matrix/client/r0/user/%s/filter" % ("@watermelon:test"),
@@ -57,7 +61,7 @@ class FilterTestCase(unittest.HomeserverTestCase):
         self.assertEqual(channel.result["code"], b"403")
         self.assertEqual(channel.json_body["errcode"], Codes.FORBIDDEN)
 
-    def test_add_filter_non_local_user(self):
+    def test_add_filter_non_local_user(self) -> None:
         _is_mine = self.hs.is_mine
         self.hs.is_mine = lambda target_user: False
         channel = self.make_request(
@@ -70,14 +74,13 @@ class FilterTestCase(unittest.HomeserverTestCase):
         self.assertEqual(channel.result["code"], b"403")
         self.assertEqual(channel.json_body["errcode"], Codes.FORBIDDEN)
 
-    def test_get_filter(self):
-        filter_id = defer.ensureDeferred(
+    def test_get_filter(self) -> None:
+        filter_id = self.get_success(
             self.filtering.add_user_filter(
                 user_localpart="apple", user_filter=self.EXAMPLE_FILTER
             )
         )
         self.reactor.advance(1)
-        filter_id = filter_id.result
         channel = self.make_request(
             "GET", "/_matrix/client/r0/user/%s/filter/%s" % (self.user_id, filter_id)
         )
@@ -85,7 +88,7 @@ class FilterTestCase(unittest.HomeserverTestCase):
         self.assertEqual(channel.result["code"], b"200")
         self.assertEqual(channel.json_body, self.EXAMPLE_FILTER)
 
-    def test_get_filter_non_existant(self):
+    def test_get_filter_non_existant(self) -> None:
         channel = self.make_request(
             "GET", "/_matrix/client/r0/user/%s/filter/12382148321" % (self.user_id)
         )
@@ -95,7 +98,7 @@ class FilterTestCase(unittest.HomeserverTestCase):
 
     # Currently invalid params do not have an appropriate errcode
     # in errors.py
-    def test_get_filter_invalid_id(self):
+    def test_get_filter_invalid_id(self) -> None:
         channel = self.make_request(
             "GET", "/_matrix/client/r0/user/%s/filter/foobar" % (self.user_id)
         )
@@ -103,7 +106,7 @@ class FilterTestCase(unittest.HomeserverTestCase):
         self.assertEqual(channel.result["code"], b"400")
 
     # No ID also returns an invalid_id error
-    def test_get_filter_no_id(self):
+    def test_get_filter_no_id(self) -> None:
         channel = self.make_request(
             "GET", "/_matrix/client/r0/user/%s/filter/" % (self.user_id)
         )
diff --git a/tests/rest/client/test_relations.py b/tests/rest/client/test_relations.py
index c8db45719e..274f9c44c1 100644
--- a/tests/rest/client/test_relations.py
+++ b/tests/rest/client/test_relations.py
@@ -15,7 +15,7 @@
 
 import itertools
 import urllib.parse
-from typing import Dict, List, Optional, Tuple
+from typing import Any, Dict, List, Optional, Tuple
 from unittest.mock import patch
 
 from twisted.test.proto_helpers import MemoryReactor
@@ -24,8 +24,7 @@ from synapse.api.constants import EventTypes, RelationTypes
 from synapse.rest import admin
 from synapse.rest.client import login, register, relations, room, sync
 from synapse.server import HomeServer
-from synapse.storage.relations import RelationPaginationToken
-from synapse.types import JsonDict, StreamToken
+from synapse.types import JsonDict
 from synapse.util import Clock
 
 from tests import unittest
@@ -34,7 +33,7 @@ from tests.test_utils import make_awaitable
 from tests.test_utils.event_injection import inject_event
 
 
-class RelationsTestCase(unittest.HomeserverTestCase):
+class BaseRelationsTestCase(unittest.HomeserverTestCase):
     servlets = [
         relations.register_servlets,
         room.register_servlets,
@@ -45,10 +44,9 @@ class RelationsTestCase(unittest.HomeserverTestCase):
     ]
     hijack_auth = False
 
-    def default_config(self) -> dict:
+    def default_config(self) -> Dict[str, Any]:
         # We need to enable msc1849 support for aggregations
         config = super().default_config()
-        config["experimental_msc1849_support_enabled"] = True
 
         # We enable frozen dicts as relations/edits change event contents, so we
         # want to test that we don't modify the events in the caches.
@@ -67,10 +65,62 @@ class RelationsTestCase(unittest.HomeserverTestCase):
         res = self.helper.send(self.room, body="Hi!", tok=self.user_token)
         self.parent_id = res["event_id"]
 
-    def test_send_relation(self) -> None:
-        """Tests that sending a relation using the new /send_relation works
-        creates the right shape of event.
+    def _create_user(self, localpart: str) -> Tuple[str, str]:
+        user_id = self.register_user(localpart, "abc123")
+        access_token = self.login(localpart, "abc123")
+
+        return user_id, access_token
+
+    def _send_relation(
+        self,
+        relation_type: str,
+        event_type: str,
+        key: Optional[str] = None,
+        content: Optional[dict] = None,
+        access_token: Optional[str] = None,
+        parent_id: Optional[str] = None,
+    ) -> FakeChannel:
+        """Helper function to send a relation pointing at `self.parent_id`
+
+        Args:
+            relation_type: One of `RelationTypes`
+            event_type: The type of the event to create
+            key: The aggregation key used for m.annotation relation type.
+            content: The content of the created event. Will be modified to configure
+                the m.relates_to key based on the other provided parameters.
+            access_token: The access token used to send the relation, defaults
+                to `self.user_token`
+            parent_id: The event_id this relation relates to. If None, then self.parent_id
+
+        Returns:
+            FakeChannel
         """
+        if not access_token:
+            access_token = self.user_token
+
+        original_id = parent_id if parent_id else self.parent_id
+
+        if content is None:
+            content = {}
+        content["m.relates_to"] = {
+            "event_id": original_id,
+            "rel_type": relation_type,
+        }
+        if key is not None:
+            content["m.relates_to"]["key"] = key
+
+        channel = self.make_request(
+            "POST",
+            f"/_matrix/client/v3/rooms/{self.room}/send/{event_type}",
+            content,
+            access_token=access_token,
+        )
+        return channel
+
+
+class RelationsTestCase(BaseRelationsTestCase):
+    def test_send_relation(self) -> None:
+        """Tests that sending a relation works."""
 
         channel = self._send_relation(RelationTypes.ANNOTATION, "m.reaction", key="👍")
         self.assertEqual(200, channel.code, channel.json_body)
@@ -79,7 +129,7 @@ class RelationsTestCase(unittest.HomeserverTestCase):
 
         channel = self.make_request(
             "GET",
-            "/rooms/%s/event/%s" % (self.room, event_id),
+            f"/rooms/{self.room}/event/{event_id}",
             access_token=self.user_token,
         )
         self.assertEqual(200, channel.code, channel.json_body)
@@ -230,15 +280,6 @@ class RelationsTestCase(unittest.HomeserverTestCase):
             channel.json_body["chunk"][0],
         )
 
-    def _stream_token_to_relation_token(self, token: str) -> str:
-        """Convert a StreamToken into a legacy token (RelationPaginationToken)."""
-        room_key = self.get_success(StreamToken.from_string(self.store, token)).room_key
-        return self.get_success(
-            RelationPaginationToken(
-                topological=room_key.topological, stream=room_key.stream
-            ).to_string(self.store)
-        )
-
     def test_repeated_paginate_relations(self) -> None:
         """Test that if we paginate using a limit and tokens then we get the
         expected events.
@@ -279,34 +320,6 @@ class RelationsTestCase(unittest.HomeserverTestCase):
         found_event_ids.reverse()
         self.assertEqual(found_event_ids, expected_event_ids)
 
-        # Reset and try again, but convert the tokens to the legacy format.
-        prev_token = ""
-        found_event_ids = []
-        for _ in range(20):
-            from_token = ""
-            if prev_token:
-                from_token = "&from=" + self._stream_token_to_relation_token(prev_token)
-
-            channel = self.make_request(
-                "GET",
-                f"/_matrix/client/unstable/rooms/{self.room}/relations/{self.parent_id}?limit=1{from_token}",
-                access_token=self.user_token,
-            )
-            self.assertEqual(200, channel.code, channel.json_body)
-
-            found_event_ids.extend(e["event_id"] for e in channel.json_body["chunk"])
-            next_batch = channel.json_body.get("next_batch")
-
-            self.assertNotEqual(prev_token, next_batch)
-            prev_token = next_batch
-
-            if not prev_token:
-                break
-
-        # We paginated backwards, so reverse
-        found_event_ids.reverse()
-        self.assertEqual(found_event_ids, expected_event_ids)
-
     def test_pagination_from_sync_and_messages(self) -> None:
         """Pagination tokens from /sync and /messages can be used to paginate /relations."""
         channel = self._send_relation(RelationTypes.ANNOTATION, "m.reaction", "A")
@@ -317,9 +330,7 @@ class RelationsTestCase(unittest.HomeserverTestCase):
 
         # Request /sync, limiting it such that only the latest event is returned
         # (and not the relation).
-        filter = urllib.parse.quote_plus(
-            '{"room": {"timeline": {"limit": 1}}}'.encode()
-        )
+        filter = urllib.parse.quote_plus(b'{"room": {"timeline": {"limit": 1}}}')
         channel = self.make_request(
             "GET", f"/sync?filter={filter}", access_token=self.user_token
         )
@@ -404,8 +415,7 @@ class RelationsTestCase(unittest.HomeserverTestCase):
 
             channel = self.make_request(
                 "GET",
-                "/_matrix/client/unstable/rooms/%s/aggregations/%s?limit=1%s"
-                % (self.room, self.parent_id, from_token),
+                f"/_matrix/client/unstable/rooms/{self.room}/aggregations/{self.parent_id}?limit=1{from_token}",
                 access_token=self.user_token,
             )
             self.assertEqual(200, channel.code, channel.json_body)
@@ -495,39 +505,6 @@ class RelationsTestCase(unittest.HomeserverTestCase):
         found_event_ids.reverse()
         self.assertEqual(found_event_ids, expected_event_ids)
 
-        # Reset and try again, but convert the tokens to the legacy format.
-        prev_token = ""
-        found_event_ids = []
-        for _ in range(20):
-            from_token = ""
-            if prev_token:
-                from_token = "&from=" + self._stream_token_to_relation_token(prev_token)
-
-            channel = self.make_request(
-                "GET",
-                f"/_matrix/client/unstable/rooms/{self.room}"
-                f"/aggregations/{self.parent_id}/{RelationTypes.ANNOTATION}"
-                f"/m.reaction/{encoded_key}?limit=1{from_token}",
-                access_token=self.user_token,
-            )
-            self.assertEqual(200, channel.code, channel.json_body)
-
-            self.assertEqual(len(channel.json_body["chunk"]), 1, channel.json_body)
-
-            found_event_ids.extend(e["event_id"] for e in channel.json_body["chunk"])
-
-            next_batch = channel.json_body.get("next_batch")
-
-            self.assertNotEqual(prev_token, next_batch)
-            prev_token = next_batch
-
-            if not prev_token:
-                break
-
-        # We paginated backwards, so reverse
-        found_event_ids.reverse()
-        self.assertEqual(found_event_ids, expected_event_ids)
-
     def test_aggregation(self) -> None:
         """Test that annotations get correctly aggregated."""
 
@@ -544,8 +521,7 @@ class RelationsTestCase(unittest.HomeserverTestCase):
 
         channel = self.make_request(
             "GET",
-            "/_matrix/client/unstable/rooms/%s/aggregations/%s"
-            % (self.room, self.parent_id),
+            f"/_matrix/client/unstable/rooms/{self.room}/aggregations/{self.parent_id}",
             access_token=self.user_token,
         )
         self.assertEqual(200, channel.code, channel.json_body)
@@ -560,47 +536,13 @@ class RelationsTestCase(unittest.HomeserverTestCase):
             },
         )
 
-    def test_aggregation_redactions(self) -> None:
-        """Test that annotations get correctly aggregated after a redaction."""
-
-        channel = self._send_relation(RelationTypes.ANNOTATION, "m.reaction", "a")
-        self.assertEqual(200, channel.code, channel.json_body)
-        to_redact_event_id = channel.json_body["event_id"]
-
-        channel = self._send_relation(
-            RelationTypes.ANNOTATION, "m.reaction", "a", access_token=self.user2_token
-        )
-        self.assertEqual(200, channel.code, channel.json_body)
-
-        # Now lets redact one of the 'a' reactions
-        channel = self.make_request(
-            "POST",
-            "/_matrix/client/r0/rooms/%s/redact/%s" % (self.room, to_redact_event_id),
-            access_token=self.user_token,
-            content={},
-        )
-        self.assertEqual(200, channel.code, channel.json_body)
-
-        channel = self.make_request(
-            "GET",
-            "/_matrix/client/unstable/rooms/%s/aggregations/%s"
-            % (self.room, self.parent_id),
-            access_token=self.user_token,
-        )
-        self.assertEqual(200, channel.code, channel.json_body)
-
-        self.assertEqual(
-            channel.json_body,
-            {"chunk": [{"type": "m.reaction", "key": "a", "count": 1}]},
-        )
-
     def test_aggregation_must_be_annotation(self) -> None:
         """Test that aggregations must be annotations."""
 
         channel = self.make_request(
             "GET",
-            "/_matrix/client/unstable/rooms/%s/aggregations/%s/%s?limit=1"
-            % (self.room, self.parent_id, RelationTypes.REPLACE),
+            f"/_matrix/client/unstable/rooms/{self.room}/aggregations"
+            f"/{self.parent_id}/{RelationTypes.REPLACE}?limit=1",
             access_token=self.user_token,
         )
         self.assertEqual(400, channel.code, channel.json_body)
@@ -691,10 +633,8 @@ class RelationsTestCase(unittest.HomeserverTestCase):
                         }
                     },
                     "event_id": thread_2,
-                    "room_id": self.room,
                     "sender": self.user_id,
                     "type": "m.room.test",
-                    "user_id": self.user_id,
                 },
                 relations_dict[RelationTypes.THREAD].get("latest_event"),
             )
@@ -986,9 +926,7 @@ class RelationsTestCase(unittest.HomeserverTestCase):
 
         # Request sync, but limit the timeline so it becomes limited (and includes
         # bundled aggregations).
-        filter = urllib.parse.quote_plus(
-            '{"room": {"timeline": {"limit": 2}}}'.encode()
-        )
+        filter = urllib.parse.quote_plus(b'{"room": {"timeline": {"limit": 2}}}')
         channel = self.make_request(
             "GET", f"/sync?filter={filter}", access_token=self.user_token
         )
@@ -1053,7 +991,7 @@ class RelationsTestCase(unittest.HomeserverTestCase):
 
         channel = self.make_request(
             "GET",
-            "/rooms/%s/event/%s" % (self.room, self.parent_id),
+            f"/rooms/{self.room}/event/{self.parent_id}",
             access_token=self.user_token,
         )
         self.assertEqual(200, channel.code, channel.json_body)
@@ -1096,7 +1034,7 @@ class RelationsTestCase(unittest.HomeserverTestCase):
 
         channel = self.make_request(
             "GET",
-            "/rooms/%s/event/%s" % (self.room, reply),
+            f"/rooms/{self.room}/event/{reply}",
             access_token=self.user_token,
         )
         self.assertEqual(200, channel.code, channel.json_body)
@@ -1198,7 +1136,7 @@ class RelationsTestCase(unittest.HomeserverTestCase):
         # Request the original event.
         channel = self.make_request(
             "GET",
-            "/rooms/%s/event/%s" % (self.room, self.parent_id),
+            f"/rooms/{self.room}/event/{self.parent_id}",
             access_token=self.user_token,
         )
         self.assertEqual(200, channel.code, channel.json_body)
@@ -1217,102 +1155,6 @@ class RelationsTestCase(unittest.HomeserverTestCase):
             {"event_id": edit_event_id, "sender": self.user_id}, m_replace_dict
         )
 
-    def test_relations_redaction_redacts_edits(self) -> None:
-        """Test that edits of an event are redacted when the original event
-        is redacted.
-        """
-        # Send a new event
-        res = self.helper.send(self.room, body="Heyo!", tok=self.user_token)
-        original_event_id = res["event_id"]
-
-        # Add a relation
-        channel = self._send_relation(
-            RelationTypes.REPLACE,
-            "m.room.message",
-            parent_id=original_event_id,
-            content={
-                "msgtype": "m.text",
-                "body": "Wibble",
-                "m.new_content": {"msgtype": "m.text", "body": "First edit"},
-            },
-        )
-        self.assertEqual(200, channel.code, channel.json_body)
-
-        # Check the relation is returned
-        channel = self.make_request(
-            "GET",
-            "/_matrix/client/unstable/rooms/%s/relations/%s/m.replace/m.room.message"
-            % (self.room, original_event_id),
-            access_token=self.user_token,
-        )
-        self.assertEqual(200, channel.code, channel.json_body)
-
-        self.assertIn("chunk", channel.json_body)
-        self.assertEqual(len(channel.json_body["chunk"]), 1)
-
-        # Redact the original event
-        channel = self.make_request(
-            "PUT",
-            "/rooms/%s/redact/%s/%s"
-            % (self.room, original_event_id, "test_relations_redaction_redacts_edits"),
-            access_token=self.user_token,
-            content="{}",
-        )
-        self.assertEqual(200, channel.code, channel.json_body)
-
-        # Try to check for remaining m.replace relations
-        channel = self.make_request(
-            "GET",
-            "/_matrix/client/unstable/rooms/%s/relations/%s/m.replace/m.room.message"
-            % (self.room, original_event_id),
-            access_token=self.user_token,
-        )
-        self.assertEqual(200, channel.code, channel.json_body)
-
-        # Check that no relations are returned
-        self.assertIn("chunk", channel.json_body)
-        self.assertEqual(channel.json_body["chunk"], [])
-
-    def test_aggregations_redaction_prevents_access_to_aggregations(self) -> None:
-        """Test that annotations of an event are redacted when the original event
-        is redacted.
-        """
-        # Send a new event
-        res = self.helper.send(self.room, body="Hello!", tok=self.user_token)
-        original_event_id = res["event_id"]
-
-        # Add a relation
-        channel = self._send_relation(
-            RelationTypes.ANNOTATION, "m.reaction", key="👍", parent_id=original_event_id
-        )
-        self.assertEqual(200, channel.code, channel.json_body)
-
-        # Redact the original
-        channel = self.make_request(
-            "PUT",
-            "/rooms/%s/redact/%s/%s"
-            % (
-                self.room,
-                original_event_id,
-                "test_aggregations_redaction_prevents_access_to_aggregations",
-            ),
-            access_token=self.user_token,
-            content="{}",
-        )
-        self.assertEqual(200, channel.code, channel.json_body)
-
-        # Check that aggregations returns zero
-        channel = self.make_request(
-            "GET",
-            "/_matrix/client/unstable/rooms/%s/aggregations/%s/m.annotation/m.reaction"
-            % (self.room, original_event_id),
-            access_token=self.user_token,
-        )
-        self.assertEqual(200, channel.code, channel.json_body)
-
-        self.assertIn("chunk", channel.json_body)
-        self.assertEqual(channel.json_body["chunk"], [])
-
     def test_unknown_relations(self) -> None:
         """Unknown relations should be accepted."""
         channel = self._send_relation("m.relation.test", "m.room.test")
@@ -1321,8 +1163,7 @@ class RelationsTestCase(unittest.HomeserverTestCase):
 
         channel = self.make_request(
             "GET",
-            "/_matrix/client/unstable/rooms/%s/relations/%s?limit=1"
-            % (self.room, self.parent_id),
+            f"/_matrix/client/unstable/rooms/{self.room}/relations/{self.parent_id}?limit=1",
             access_token=self.user_token,
         )
         self.assertEqual(200, channel.code, channel.json_body)
@@ -1343,7 +1184,7 @@ class RelationsTestCase(unittest.HomeserverTestCase):
         # When bundling the unknown relation is not included.
         channel = self.make_request(
             "GET",
-            "/rooms/%s/event/%s" % (self.room, self.parent_id),
+            f"/rooms/{self.room}/event/{self.parent_id}",
             access_token=self.user_token,
         )
         self.assertEqual(200, channel.code, channel.json_body)
@@ -1352,8 +1193,7 @@ class RelationsTestCase(unittest.HomeserverTestCase):
         # But unknown relations can be directly queried.
         channel = self.make_request(
             "GET",
-            "/_matrix/client/unstable/rooms/%s/aggregations/%s?limit=1"
-            % (self.room, self.parent_id),
+            f"/_matrix/client/unstable/rooms/{self.room}/aggregations/{self.parent_id}?limit=1",
             access_token=self.user_token,
         )
         self.assertEqual(200, channel.code, channel.json_body)
@@ -1369,58 +1209,6 @@ class RelationsTestCase(unittest.HomeserverTestCase):
 
         raise AssertionError(f"Event {self.parent_id} not found in chunk")
 
-    def _send_relation(
-        self,
-        relation_type: str,
-        event_type: str,
-        key: Optional[str] = None,
-        content: Optional[dict] = None,
-        access_token: Optional[str] = None,
-        parent_id: Optional[str] = None,
-    ) -> FakeChannel:
-        """Helper function to send a relation pointing at `self.parent_id`
-
-        Args:
-            relation_type: One of `RelationTypes`
-            event_type: The type of the event to create
-            key: The aggregation key used for m.annotation relation type.
-            content: The content of the created event. Will be modified to configure
-                the m.relates_to key based on the other provided parameters.
-            access_token: The access token used to send the relation, defaults
-                to `self.user_token`
-            parent_id: The event_id this relation relates to. If None, then self.parent_id
-
-        Returns:
-            FakeChannel
-        """
-        if not access_token:
-            access_token = self.user_token
-
-        original_id = parent_id if parent_id else self.parent_id
-
-        if content is None:
-            content = {}
-        content["m.relates_to"] = {
-            "event_id": original_id,
-            "rel_type": relation_type,
-        }
-        if key is not None:
-            content["m.relates_to"]["key"] = key
-
-        channel = self.make_request(
-            "POST",
-            f"/_matrix/client/v3/rooms/{self.room}/send/{event_type}",
-            content,
-            access_token=access_token,
-        )
-        return channel
-
-    def _create_user(self, localpart: str) -> Tuple[str, str]:
-        user_id = self.register_user(localpart, "abc123")
-        access_token = self.login(localpart, "abc123")
-
-        return user_id, access_token
-
     def test_background_update(self) -> None:
         """Test the event_arbitrary_relations background update."""
         channel = self._send_relation(RelationTypes.ANNOTATION, "m.reaction", key="👍")
@@ -1482,3 +1270,112 @@ class RelationsTestCase(unittest.HomeserverTestCase):
             [ev["event_id"] for ev in channel.json_body["chunk"]],
             [annotation_event_id_good, thread_event_id],
         )
+
+
+class RelationRedactionTestCase(BaseRelationsTestCase):
+    """Test the behaviour of relations when the parent or child event is redacted."""
+
+    def _redact(self, event_id: str) -> None:
+        channel = self.make_request(
+            "POST",
+            f"/_matrix/client/r0/rooms/{self.room}/redact/{event_id}",
+            access_token=self.user_token,
+            content={},
+        )
+        self.assertEqual(200, channel.code, channel.json_body)
+
+    def test_redact_relation_annotation(self) -> None:
+        """Test that annotations of an event are properly handled after the
+        annotation is redacted.
+        """
+        channel = self._send_relation(RelationTypes.ANNOTATION, "m.reaction", "a")
+        self.assertEqual(200, channel.code, channel.json_body)
+        to_redact_event_id = channel.json_body["event_id"]
+
+        channel = self._send_relation(
+            RelationTypes.ANNOTATION, "m.reaction", "a", access_token=self.user2_token
+        )
+        self.assertEqual(200, channel.code, channel.json_body)
+
+        # Redact one of the reactions.
+        self._redact(to_redact_event_id)
+
+        # Ensure that the aggregations are correct.
+        channel = self.make_request(
+            "GET",
+            f"/_matrix/client/unstable/rooms/{self.room}/aggregations/{self.parent_id}",
+            access_token=self.user_token,
+        )
+        self.assertEqual(200, channel.code, channel.json_body)
+
+        self.assertEqual(
+            channel.json_body,
+            {"chunk": [{"type": "m.reaction", "key": "a", "count": 1}]},
+        )
+
+    def test_redact_relation_edit(self) -> None:
+        """Test that edits of an event are redacted when the original event
+        is redacted.
+        """
+        # Add a relation
+        channel = self._send_relation(
+            RelationTypes.REPLACE,
+            "m.room.message",
+            parent_id=self.parent_id,
+            content={
+                "msgtype": "m.text",
+                "body": "Wibble",
+                "m.new_content": {"msgtype": "m.text", "body": "First edit"},
+            },
+        )
+        self.assertEqual(200, channel.code, channel.json_body)
+
+        # Check the relation is returned
+        channel = self.make_request(
+            "GET",
+            f"/_matrix/client/unstable/rooms/{self.room}/relations"
+            f"/{self.parent_id}/m.replace/m.room.message",
+            access_token=self.user_token,
+        )
+        self.assertEqual(200, channel.code, channel.json_body)
+
+        self.assertIn("chunk", channel.json_body)
+        self.assertEqual(len(channel.json_body["chunk"]), 1)
+
+        # Redact the original event
+        self._redact(self.parent_id)
+
+        # Try to check for remaining m.replace relations
+        channel = self.make_request(
+            "GET",
+            f"/_matrix/client/unstable/rooms/{self.room}/relations"
+            f"/{self.parent_id}/m.replace/m.room.message",
+            access_token=self.user_token,
+        )
+        self.assertEqual(200, channel.code, channel.json_body)
+
+        # Check that no relations are returned
+        self.assertIn("chunk", channel.json_body)
+        self.assertEqual(channel.json_body["chunk"], [])
+
+    def test_redact_parent(self) -> None:
+        """Test that annotations of an event are redacted when the original event
+        is redacted.
+        """
+        # Add a relation
+        channel = self._send_relation(RelationTypes.ANNOTATION, "m.reaction", key="👍")
+        self.assertEqual(200, channel.code, channel.json_body)
+
+        # Redact the original event.
+        self._redact(self.parent_id)
+
+        # Check that aggregations returns zero
+        channel = self.make_request(
+            "GET",
+            f"/_matrix/client/unstable/rooms/{self.room}/aggregations/{self.parent_id}/m.annotation/m.reaction",
+            access_token=self.user_token,
+        )
+        self.assertEqual(200, channel.code, channel.json_body)
+
+        self.assertIn("chunk", channel.json_body)
+        self.assertEqual(channel.json_body["chunk"], [])
diff --git a/tests/rest/client/test_report_event.py b/tests/rest/client/test_report_event.py
index ee6b0b9ebf..20a259fc43 100644
--- a/tests/rest/client/test_report_event.py
+++ b/tests/rest/client/test_report_event.py
@@ -14,8 +14,13 @@
 
 import json
 
+from twisted.test.proto_helpers import MemoryReactor
+
 import synapse.rest.admin
 from synapse.rest.client import login, report_event, room
+from synapse.server import HomeServer
+from synapse.types import JsonDict
+from synapse.util import Clock
 
 from tests import unittest
 
@@ -28,7 +33,7 @@ class ReportEventTestCase(unittest.HomeserverTestCase):
         report_event.register_servlets,
     ]
 
-    def prepare(self, reactor, clock, hs):
+    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
         self.admin_user = self.register_user("admin", "pass", admin=True)
         self.admin_user_tok = self.login("admin", "pass")
         self.other_user = self.register_user("user", "pass")
@@ -42,35 +47,35 @@ class ReportEventTestCase(unittest.HomeserverTestCase):
         self.event_id = resp["event_id"]
         self.report_path = f"rooms/{self.room_id}/report/{self.event_id}"
 
-    def test_reason_str_and_score_int(self):
+    def test_reason_str_and_score_int(self) -> None:
         data = {"reason": "this makes me sad", "score": -100}
         self._assert_status(200, data)
 
-    def test_no_reason(self):
+    def test_no_reason(self) -> None:
         data = {"score": 0}
         self._assert_status(200, data)
 
-    def test_no_score(self):
+    def test_no_score(self) -> None:
         data = {"reason": "this makes me sad"}
         self._assert_status(200, data)
 
-    def test_no_reason_and_no_score(self):
-        data = {}
+    def test_no_reason_and_no_score(self) -> None:
+        data: JsonDict = {}
         self._assert_status(200, data)
 
-    def test_reason_int_and_score_str(self):
+    def test_reason_int_and_score_str(self) -> None:
         data = {"reason": 10, "score": "string"}
         self._assert_status(400, data)
 
-    def test_reason_zero_and_score_blank(self):
+    def test_reason_zero_and_score_blank(self) -> None:
         data = {"reason": 0, "score": ""}
         self._assert_status(400, data)
 
-    def test_reason_and_score_null(self):
+    def test_reason_and_score_null(self) -> None:
         data = {"reason": None, "score": None}
         self._assert_status(400, data)
 
-    def _assert_status(self, response_status, data):
+    def _assert_status(self, response_status: int, data: JsonDict) -> None:
         channel = self.make_request(
             "POST",
             self.report_path,
diff --git a/tests/rest/client/test_rooms.py b/tests/rest/client/test_rooms.py
index e0b11e7264..37866ee330 100644
--- a/tests/rest/client/test_rooms.py
+++ b/tests/rest/client/test_rooms.py
@@ -18,11 +18,12 @@
 """Tests REST events for /rooms paths."""
 
 import json
-from typing import Iterable, List
+from typing import Any, Dict, Iterable, List, Optional
 from unittest.mock import Mock, call
 from urllib import parse as urlparse
 
 from twisted.internet import defer
+from twisted.test.proto_helpers import MemoryReactor
 
 import synapse.rest.admin
 from synapse.api.constants import (
@@ -35,7 +36,9 @@ from synapse.api.errors import Codes, HttpResponseException
 from synapse.handlers.pagination import PurgeStatus
 from synapse.rest import admin
 from synapse.rest.client import account, directory, login, profile, room, sync
+from synapse.server import HomeServer
 from synapse.types import JsonDict, RoomAlias, UserID, create_requester
+from synapse.util import Clock
 from synapse.util.stringutils import random_string
 
 from tests import unittest
@@ -45,11 +48,11 @@ PATH_PREFIX = b"/_matrix/client/api/v1"
 
 
 class RoomBase(unittest.HomeserverTestCase):
-    rmcreator_id = None
+    rmcreator_id: Optional[str] = None
 
     servlets = [room.register_servlets, room.register_deprecated_servlets]
 
-    def make_homeserver(self, reactor, clock):
+    def make_homeserver(self, reactor: MemoryReactor, clock: Clock) -> HomeServer:
 
         self.hs = self.setup_test_homeserver(
             "red",
@@ -57,15 +60,15 @@ class RoomBase(unittest.HomeserverTestCase):
             federation_client=Mock(),
         )
 
-        self.hs.get_federation_handler = Mock()
+        self.hs.get_federation_handler = Mock()  # type: ignore[assignment]
         self.hs.get_federation_handler.return_value.maybe_backfill = Mock(
             return_value=make_awaitable(None)
         )
 
-        async def _insert_client_ip(*args, **kwargs):
+        async def _insert_client_ip(*args: Any, **kwargs: Any) -> None:
             return None
 
-        self.hs.get_datastores().main.insert_client_ip = _insert_client_ip
+        self.hs.get_datastores().main.insert_client_ip = _insert_client_ip  # type: ignore[assignment]
 
         return self.hs
 
@@ -76,7 +79,7 @@ class RoomPermissionsTestCase(RoomBase):
     user_id = "@sid1:red"
     rmcreator_id = "@notme:red"
 
-    def prepare(self, reactor, clock, hs):
+    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
 
         self.helper.auth_user_id = self.rmcreator_id
         # create some rooms under the name rmcreator_id
@@ -108,12 +111,12 @@ class RoomPermissionsTestCase(RoomBase):
         # auth as user_id now
         self.helper.auth_user_id = self.user_id
 
-    def test_can_do_action(self):
+    def test_can_do_action(self) -> None:
         msg_content = b'{"msgtype":"m.text","body":"hello"}'
 
         seq = iter(range(100))
 
-        def send_msg_path():
+        def send_msg_path() -> str:
             return "/rooms/%s/send/m.room.message/mid%s" % (
                 self.created_rmid,
                 str(next(seq)),
@@ -148,7 +151,7 @@ class RoomPermissionsTestCase(RoomBase):
         channel = self.make_request("PUT", send_msg_path(), msg_content)
         self.assertEqual(403, channel.code, msg=channel.result["body"])
 
-    def test_topic_perms(self):
+    def test_topic_perms(self) -> None:
         topic_content = b'{"topic":"My Topic Name"}'
         topic_path = "/rooms/%s/state/m.room.topic" % self.created_rmid
 
@@ -214,14 +217,14 @@ class RoomPermissionsTestCase(RoomBase):
         self.assertEqual(403, channel.code, msg=channel.result["body"])
 
     def _test_get_membership(
-        self, room=None, members: Iterable = frozenset(), expect_code=None
-    ):
+        self, room: str, members: Iterable = frozenset(), expect_code: int = 200
+    ) -> None:
         for member in members:
             path = "/rooms/%s/state/m.room.member/%s" % (room, member)
             channel = self.make_request("GET", path)
             self.assertEqual(expect_code, channel.code)
 
-    def test_membership_basic_room_perms(self):
+    def test_membership_basic_room_perms(self) -> None:
         # === room does not exist ===
         room = self.uncreated_rmid
         # get membership of self, get membership of other, uncreated room
@@ -241,7 +244,7 @@ class RoomPermissionsTestCase(RoomBase):
             self.helper.join(room=room, user=usr, expect_code=404)
             self.helper.leave(room=room, user=usr, expect_code=404)
 
-    def test_membership_private_room_perms(self):
+    def test_membership_private_room_perms(self) -> None:
         room = self.created_rmid
         # get membership of self, get membership of other, private room + invite
         # expect all 403s
@@ -264,7 +267,7 @@ class RoomPermissionsTestCase(RoomBase):
             members=[self.user_id, self.rmcreator_id], room=room, expect_code=200
         )
 
-    def test_membership_public_room_perms(self):
+    def test_membership_public_room_perms(self) -> None:
         room = self.created_public_rmid
         # get membership of self, get membership of other, public room + invite
         # expect 403
@@ -287,7 +290,7 @@ class RoomPermissionsTestCase(RoomBase):
             members=[self.user_id, self.rmcreator_id], room=room, expect_code=200
         )
 
-    def test_invited_permissions(self):
+    def test_invited_permissions(self) -> None:
         room = self.created_rmid
         self.helper.invite(room=room, src=self.rmcreator_id, targ=self.user_id)
 
@@ -310,7 +313,7 @@ class RoomPermissionsTestCase(RoomBase):
             expect_code=403,
         )
 
-    def test_joined_permissions(self):
+    def test_joined_permissions(self) -> None:
         room = self.created_rmid
         self.helper.invite(room=room, src=self.rmcreator_id, targ=self.user_id)
         self.helper.join(room=room, user=self.user_id)
@@ -348,7 +351,7 @@ class RoomPermissionsTestCase(RoomBase):
         # set left of self, expect 200
         self.helper.leave(room=room, user=self.user_id)
 
-    def test_leave_permissions(self):
+    def test_leave_permissions(self) -> None:
         room = self.created_rmid
         self.helper.invite(room=room, src=self.rmcreator_id, targ=self.user_id)
         self.helper.join(room=room, user=self.user_id)
@@ -383,7 +386,7 @@ class RoomPermissionsTestCase(RoomBase):
         )
 
     # tests the "from banned" line from the table in https://spec.matrix.org/unstable/client-server-api/#mroommember
-    def test_member_event_from_ban(self):
+    def test_member_event_from_ban(self) -> None:
         room = self.created_rmid
         self.helper.invite(room=room, src=self.rmcreator_id, targ=self.user_id)
         self.helper.join(room=room, user=self.user_id)
@@ -475,21 +478,21 @@ class RoomsMemberListTestCase(RoomBase):
 
     user_id = "@sid1:red"
 
-    def test_get_member_list(self):
+    def test_get_member_list(self) -> None:
         room_id = self.helper.create_room_as(self.user_id)
         channel = self.make_request("GET", "/rooms/%s/members" % room_id)
         self.assertEqual(200, channel.code, msg=channel.result["body"])
 
-    def test_get_member_list_no_room(self):
+    def test_get_member_list_no_room(self) -> None:
         channel = self.make_request("GET", "/rooms/roomdoesnotexist/members")
         self.assertEqual(403, channel.code, msg=channel.result["body"])
 
-    def test_get_member_list_no_permission(self):
+    def test_get_member_list_no_permission(self) -> None:
         room_id = self.helper.create_room_as("@some_other_guy:red")
         channel = self.make_request("GET", "/rooms/%s/members" % room_id)
         self.assertEqual(403, channel.code, msg=channel.result["body"])
 
-    def test_get_member_list_no_permission_with_at_token(self):
+    def test_get_member_list_no_permission_with_at_token(self) -> None:
         """
         Tests that a stranger to the room cannot get the member list
         (in the case that they use an at token).
@@ -509,7 +512,7 @@ class RoomsMemberListTestCase(RoomBase):
         )
         self.assertEqual(403, channel.code, msg=channel.result["body"])
 
-    def test_get_member_list_no_permission_former_member(self):
+    def test_get_member_list_no_permission_former_member(self) -> None:
         """
         Tests that a former member of the room can not get the member list.
         """
@@ -529,7 +532,7 @@ class RoomsMemberListTestCase(RoomBase):
         channel = self.make_request("GET", "/rooms/%s/members" % room_id)
         self.assertEqual(403, channel.code, msg=channel.result["body"])
 
-    def test_get_member_list_no_permission_former_member_with_at_token(self):
+    def test_get_member_list_no_permission_former_member_with_at_token(self) -> None:
         """
         Tests that a former member of the room can not get the member list
         (in the case that they use an at token).
@@ -569,7 +572,7 @@ class RoomsMemberListTestCase(RoomBase):
         )
         self.assertEqual(403, channel.code, msg=channel.result["body"])
 
-    def test_get_member_list_mixed_memberships(self):
+    def test_get_member_list_mixed_memberships(self) -> None:
         room_creator = "@some_other_guy:red"
         room_id = self.helper.create_room_as(room_creator)
         room_path = "/rooms/%s/members" % room_id
@@ -594,26 +597,26 @@ class RoomsCreateTestCase(RoomBase):
 
     user_id = "@sid1:red"
 
-    def test_post_room_no_keys(self):
+    def test_post_room_no_keys(self) -> None:
         # POST with no config keys, expect new room id
         channel = self.make_request("POST", "/createRoom", "{}")
 
         self.assertEqual(200, channel.code, channel.result)
         self.assertTrue("room_id" in channel.json_body)
 
-    def test_post_room_visibility_key(self):
+    def test_post_room_visibility_key(self) -> None:
         # POST with visibility config key, expect new room id
         channel = self.make_request("POST", "/createRoom", b'{"visibility":"private"}')
         self.assertEqual(200, channel.code)
         self.assertTrue("room_id" in channel.json_body)
 
-    def test_post_room_custom_key(self):
+    def test_post_room_custom_key(self) -> None:
         # POST with custom config keys, expect new room id
         channel = self.make_request("POST", "/createRoom", b'{"custom":"stuff"}')
         self.assertEqual(200, channel.code)
         self.assertTrue("room_id" in channel.json_body)
 
-    def test_post_room_known_and_unknown_keys(self):
+    def test_post_room_known_and_unknown_keys(self) -> None:
         # POST with custom + known config keys, expect new room id
         channel = self.make_request(
             "POST", "/createRoom", b'{"visibility":"private","custom":"things"}'
@@ -621,7 +624,7 @@ class RoomsCreateTestCase(RoomBase):
         self.assertEqual(200, channel.code)
         self.assertTrue("room_id" in channel.json_body)
 
-    def test_post_room_invalid_content(self):
+    def test_post_room_invalid_content(self) -> None:
         # POST with invalid content / paths, expect 400
         channel = self.make_request("POST", "/createRoom", b'{"visibili')
         self.assertEqual(400, channel.code)
@@ -629,7 +632,7 @@ class RoomsCreateTestCase(RoomBase):
         channel = self.make_request("POST", "/createRoom", b'["hello"]')
         self.assertEqual(400, channel.code)
 
-    def test_post_room_invitees_invalid_mxid(self):
+    def test_post_room_invitees_invalid_mxid(self) -> None:
         # POST with invalid invitee, see https://github.com/matrix-org/synapse/issues/4088
         # Note the trailing space in the MXID here!
         channel = self.make_request(
@@ -638,7 +641,7 @@ class RoomsCreateTestCase(RoomBase):
         self.assertEqual(400, channel.code)
 
     @unittest.override_config({"rc_invites": {"per_room": {"burst_count": 3}}})
-    def test_post_room_invitees_ratelimit(self):
+    def test_post_room_invitees_ratelimit(self) -> None:
         """Test that invites sent when creating a room are ratelimited by a RateLimiter,
         which ratelimits them correctly, including by not limiting when the requester is
         exempt from ratelimiting.
@@ -674,7 +677,7 @@ class RoomsCreateTestCase(RoomBase):
         channel = self.make_request("POST", "/createRoom", content)
         self.assertEqual(200, channel.code)
 
-    def test_spam_checker_may_join_room(self):
+    def test_spam_checker_may_join_room(self) -> None:
         """Tests that the user_may_join_room spam checker callback is correctly bypassed
         when creating a new room.
         """
@@ -704,12 +707,12 @@ class RoomTopicTestCase(RoomBase):
 
     user_id = "@sid1:red"
 
-    def prepare(self, reactor, clock, hs):
+    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
         # create the room
         self.room_id = self.helper.create_room_as(self.user_id)
         self.path = "/rooms/%s/state/m.room.topic" % (self.room_id,)
 
-    def test_invalid_puts(self):
+    def test_invalid_puts(self) -> None:
         # missing keys or invalid json
         channel = self.make_request("PUT", self.path, "{}")
         self.assertEqual(400, channel.code, msg=channel.result["body"])
@@ -736,7 +739,7 @@ class RoomTopicTestCase(RoomBase):
         channel = self.make_request("PUT", self.path, content)
         self.assertEqual(400, channel.code, msg=channel.result["body"])
 
-    def test_rooms_topic(self):
+    def test_rooms_topic(self) -> None:
         # nothing should be there
         channel = self.make_request("GET", self.path)
         self.assertEqual(404, channel.code, msg=channel.result["body"])
@@ -751,7 +754,7 @@ class RoomTopicTestCase(RoomBase):
         self.assertEqual(200, channel.code, msg=channel.result["body"])
         self.assert_dict(json.loads(content), channel.json_body)
 
-    def test_rooms_topic_with_extra_keys(self):
+    def test_rooms_topic_with_extra_keys(self) -> None:
         # valid put with extra keys
         content = '{"topic":"Seasons","subtopic":"Summer"}'
         channel = self.make_request("PUT", self.path, content)
@@ -768,10 +771,10 @@ class RoomMemberStateTestCase(RoomBase):
 
     user_id = "@sid1:red"
 
-    def prepare(self, reactor, clock, hs):
+    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
         self.room_id = self.helper.create_room_as(self.user_id)
 
-    def test_invalid_puts(self):
+    def test_invalid_puts(self) -> None:
         path = "/rooms/%s/state/m.room.member/%s" % (self.room_id, self.user_id)
         # missing keys or invalid json
         channel = self.make_request("PUT", path, "{}")
@@ -801,7 +804,7 @@ class RoomMemberStateTestCase(RoomBase):
         channel = self.make_request("PUT", path, content.encode("ascii"))
         self.assertEqual(400, channel.code, msg=channel.result["body"])
 
-    def test_rooms_members_self(self):
+    def test_rooms_members_self(self) -> None:
         path = "/rooms/%s/state/m.room.member/%s" % (
             urlparse.quote(self.room_id),
             self.user_id,
@@ -812,13 +815,13 @@ class RoomMemberStateTestCase(RoomBase):
         channel = self.make_request("PUT", path, content.encode("ascii"))
         self.assertEqual(200, channel.code, msg=channel.result["body"])
 
-        channel = self.make_request("GET", path, None)
+        channel = self.make_request("GET", path, content=b"")
         self.assertEqual(200, channel.code, msg=channel.result["body"])
 
         expected_response = {"membership": Membership.JOIN}
         self.assertEqual(expected_response, channel.json_body)
 
-    def test_rooms_members_other(self):
+    def test_rooms_members_other(self) -> None:
         self.other_id = "@zzsid1:red"
         path = "/rooms/%s/state/m.room.member/%s" % (
             urlparse.quote(self.room_id),
@@ -830,11 +833,11 @@ class RoomMemberStateTestCase(RoomBase):
         channel = self.make_request("PUT", path, content)
         self.assertEqual(200, channel.code, msg=channel.result["body"])
 
-        channel = self.make_request("GET", path, None)
+        channel = self.make_request("GET", path, content=b"")
         self.assertEqual(200, channel.code, msg=channel.result["body"])
         self.assertEqual(json.loads(content), channel.json_body)
 
-    def test_rooms_members_other_custom_keys(self):
+    def test_rooms_members_other_custom_keys(self) -> None:
         self.other_id = "@zzsid1:red"
         path = "/rooms/%s/state/m.room.member/%s" % (
             urlparse.quote(self.room_id),
@@ -849,7 +852,7 @@ class RoomMemberStateTestCase(RoomBase):
         channel = self.make_request("PUT", path, content)
         self.assertEqual(200, channel.code, msg=channel.result["body"])
 
-        channel = self.make_request("GET", path, None)
+        channel = self.make_request("GET", path, content=b"")
         self.assertEqual(200, channel.code, msg=channel.result["body"])
         self.assertEqual(json.loads(content), channel.json_body)
 
@@ -866,7 +869,7 @@ class RoomInviteRatelimitTestCase(RoomBase):
     @unittest.override_config(
         {"rc_invites": {"per_room": {"per_second": 0.5, "burst_count": 3}}}
     )
-    def test_invites_by_rooms_ratelimit(self):
+    def test_invites_by_rooms_ratelimit(self) -> None:
         """Tests that invites in a room are actually rate-limited."""
         room_id = self.helper.create_room_as(self.user_id)
 
@@ -878,7 +881,7 @@ class RoomInviteRatelimitTestCase(RoomBase):
     @unittest.override_config(
         {"rc_invites": {"per_user": {"per_second": 0.5, "burst_count": 3}}}
     )
-    def test_invites_by_users_ratelimit(self):
+    def test_invites_by_users_ratelimit(self) -> None:
         """Tests that invites to a specific user are actually rate-limited."""
 
         for _ in range(3):
@@ -897,7 +900,7 @@ class RoomJoinTestCase(RoomBase):
         room.register_servlets,
     ]
 
-    def prepare(self, reactor, clock, homeserver):
+    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
         self.user1 = self.register_user("thomas", "hackme")
         self.tok1 = self.login("thomas", "hackme")
 
@@ -908,7 +911,7 @@ class RoomJoinTestCase(RoomBase):
         self.room2 = self.helper.create_room_as(room_creator=self.user1, tok=self.tok1)
         self.room3 = self.helper.create_room_as(room_creator=self.user1, tok=self.tok1)
 
-    def test_spam_checker_may_join_room(self):
+    def test_spam_checker_may_join_room(self) -> None:
         """Tests that the user_may_join_room spam checker callback is correctly called
         and blocks room joins when needed.
         """
@@ -975,8 +978,8 @@ class RoomJoinRatelimitTestCase(RoomBase):
         room.register_servlets,
     ]
 
-    def prepare(self, reactor, clock, homeserver):
-        super().prepare(reactor, clock, homeserver)
+    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
+        super().prepare(reactor, clock, hs)
         # profile changes expect that the user is actually registered
         user = UserID.from_string(self.user_id)
         self.get_success(self.register_user(user.localpart, "supersecretpassword"))
@@ -984,7 +987,7 @@ class RoomJoinRatelimitTestCase(RoomBase):
     @unittest.override_config(
         {"rc_joins": {"local": {"per_second": 0.5, "burst_count": 3}}}
     )
-    def test_join_local_ratelimit(self):
+    def test_join_local_ratelimit(self) -> None:
         """Tests that local joins are actually rate-limited."""
         for _ in range(3):
             self.helper.create_room_as(self.user_id)
@@ -994,7 +997,7 @@ class RoomJoinRatelimitTestCase(RoomBase):
     @unittest.override_config(
         {"rc_joins": {"local": {"per_second": 0.5, "burst_count": 3}}}
     )
-    def test_join_local_ratelimit_profile_change(self):
+    def test_join_local_ratelimit_profile_change(self) -> None:
         """Tests that sending a profile update into all of the user's joined rooms isn't
         rate-limited by the rate-limiter on joins."""
 
@@ -1031,7 +1034,7 @@ class RoomJoinRatelimitTestCase(RoomBase):
     @unittest.override_config(
         {"rc_joins": {"local": {"per_second": 0.5, "burst_count": 3}}}
     )
-    def test_join_local_ratelimit_idempotent(self):
+    def test_join_local_ratelimit_idempotent(self) -> None:
         """Tests that the room join endpoints remain idempotent despite rate-limiting
         on room joins."""
         room_id = self.helper.create_room_as(self.user_id)
@@ -1056,7 +1059,7 @@ class RoomJoinRatelimitTestCase(RoomBase):
             "autocreate_auto_join_rooms": True,
         },
     )
-    def test_autojoin_rooms(self):
+    def test_autojoin_rooms(self) -> None:
         user_id = self.register_user("testuser", "password")
 
         # Check that the new user successfully joined the four rooms
@@ -1071,10 +1074,10 @@ class RoomMessagesTestCase(RoomBase):
 
     user_id = "@sid1:red"
 
-    def prepare(self, reactor, clock, hs):
+    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
         self.room_id = self.helper.create_room_as(self.user_id)
 
-    def test_invalid_puts(self):
+    def test_invalid_puts(self) -> None:
         path = "/rooms/%s/send/m.room.message/mid1" % (urlparse.quote(self.room_id))
         # missing keys or invalid json
         channel = self.make_request("PUT", path, b"{}")
@@ -1095,7 +1098,7 @@ class RoomMessagesTestCase(RoomBase):
         channel = self.make_request("PUT", path, b"")
         self.assertEqual(400, channel.code, msg=channel.result["body"])
 
-    def test_rooms_messages_sent(self):
+    def test_rooms_messages_sent(self) -> None:
         path = "/rooms/%s/send/m.room.message/mid1" % (urlparse.quote(self.room_id))
 
         content = b'{"body":"test","msgtype":{"type":"a"}}'
@@ -1119,11 +1122,11 @@ class RoomInitialSyncTestCase(RoomBase):
 
     user_id = "@sid1:red"
 
-    def prepare(self, reactor, clock, hs):
+    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
         # create the room
         self.room_id = self.helper.create_room_as(self.user_id)
 
-    def test_initial_sync(self):
+    def test_initial_sync(self) -> None:
         channel = self.make_request("GET", "/rooms/%s/initialSync" % self.room_id)
         self.assertEqual(200, channel.code)
 
@@ -1131,7 +1134,7 @@ class RoomInitialSyncTestCase(RoomBase):
         self.assertEqual("join", channel.json_body["membership"])
 
         # Room state is easier to assert on if we unpack it into a dict
-        state = {}
+        state: JsonDict = {}
         for event in channel.json_body["state"]:
             if "state_key" not in event:
                 continue
@@ -1160,10 +1163,10 @@ class RoomMessageListTestCase(RoomBase):
 
     user_id = "@sid1:red"
 
-    def prepare(self, reactor, clock, hs):
+    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
         self.room_id = self.helper.create_room_as(self.user_id)
 
-    def test_topo_token_is_accepted(self):
+    def test_topo_token_is_accepted(self) -> None:
         token = "t1-0_0_0_0_0_0_0_0_0"
         channel = self.make_request(
             "GET", "/rooms/%s/messages?access_token=x&from=%s" % (self.room_id, token)
@@ -1174,7 +1177,7 @@ class RoomMessageListTestCase(RoomBase):
         self.assertTrue("chunk" in channel.json_body)
         self.assertTrue("end" in channel.json_body)
 
-    def test_stream_token_is_accepted_for_fwd_pagianation(self):
+    def test_stream_token_is_accepted_for_fwd_pagianation(self) -> None:
         token = "s0_0_0_0_0_0_0_0_0"
         channel = self.make_request(
             "GET", "/rooms/%s/messages?access_token=x&from=%s" % (self.room_id, token)
@@ -1185,7 +1188,7 @@ class RoomMessageListTestCase(RoomBase):
         self.assertTrue("chunk" in channel.json_body)
         self.assertTrue("end" in channel.json_body)
 
-    def test_room_messages_purge(self):
+    def test_room_messages_purge(self) -> None:
         store = self.hs.get_datastores().main
         pagination_handler = self.hs.get_pagination_handler()
 
@@ -1278,10 +1281,10 @@ class RoomSearchTestCase(unittest.HomeserverTestCase):
     user_id = True
     hijack_auth = False
 
-    def prepare(self, reactor, clock, hs):
+    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
 
         # Register the user who does the searching
-        self.user_id = self.register_user("user", "pass")
+        self.user_id2 = self.register_user("user", "pass")
         self.access_token = self.login("user", "pass")
 
         # Register the user who sends the message
@@ -1289,12 +1292,12 @@ class RoomSearchTestCase(unittest.HomeserverTestCase):
         self.other_access_token = self.login("otheruser", "pass")
 
         # Create a room
-        self.room = self.helper.create_room_as(self.user_id, tok=self.access_token)
+        self.room = self.helper.create_room_as(self.user_id2, tok=self.access_token)
 
         # Invite the other person
         self.helper.invite(
             room=self.room,
-            src=self.user_id,
+            src=self.user_id2,
             tok=self.access_token,
             targ=self.other_user_id,
         )
@@ -1304,7 +1307,7 @@ class RoomSearchTestCase(unittest.HomeserverTestCase):
             room=self.room, user=self.other_user_id, tok=self.other_access_token
         )
 
-    def test_finds_message(self):
+    def test_finds_message(self) -> None:
         """
         The search functionality will search for content in messages if asked to
         do so.
@@ -1333,7 +1336,7 @@ class RoomSearchTestCase(unittest.HomeserverTestCase):
         # No context was requested, so we should get none.
         self.assertEqual(results["results"][0]["context"], {})
 
-    def test_include_context(self):
+    def test_include_context(self) -> None:
         """
         When event_context includes include_profile, profile information will be
         included in the search response.
@@ -1379,7 +1382,7 @@ class PublicRoomsRestrictedTestCase(unittest.HomeserverTestCase):
         login.register_servlets,
     ]
 
-    def make_homeserver(self, reactor, clock):
+    def make_homeserver(self, reactor: MemoryReactor, clock: Clock) -> HomeServer:
 
         self.url = b"/_matrix/client/r0/publicRooms"
 
@@ -1389,11 +1392,11 @@ class PublicRoomsRestrictedTestCase(unittest.HomeserverTestCase):
 
         return self.hs
 
-    def test_restricted_no_auth(self):
+    def test_restricted_no_auth(self) -> None:
         channel = self.make_request("GET", self.url)
         self.assertEqual(channel.code, 401, channel.result)
 
-    def test_restricted_auth(self):
+    def test_restricted_auth(self) -> None:
         self.register_user("user", "pass")
         tok = self.login("user", "pass")
 
@@ -1412,19 +1415,19 @@ class PublicRoomsTestRemoteSearchFallbackTestCase(unittest.HomeserverTestCase):
         login.register_servlets,
     ]
 
-    def make_homeserver(self, reactor, clock):
+    def make_homeserver(self, reactor: MemoryReactor, clock: Clock) -> HomeServer:
         return self.setup_test_homeserver(federation_client=Mock())
 
-    def prepare(self, reactor, clock, hs):
+    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
         self.register_user("user", "pass")
         self.token = self.login("user", "pass")
 
         self.federation_client = hs.get_federation_client()
 
-    def test_simple(self):
+    def test_simple(self) -> None:
         "Simple test for searching rooms over federation"
-        self.federation_client.get_public_rooms.side_effect = (
-            lambda *a, **k: defer.succeed({})
+        self.federation_client.get_public_rooms.side_effect = lambda *a, **k: defer.succeed(  # type: ignore[attr-defined]
+            {}
         )
 
         search_filter = {"generic_search_term": "foobar"}
@@ -1437,7 +1440,7 @@ class PublicRoomsTestRemoteSearchFallbackTestCase(unittest.HomeserverTestCase):
         )
         self.assertEqual(channel.code, 200, channel.result)
 
-        self.federation_client.get_public_rooms.assert_called_once_with(
+        self.federation_client.get_public_rooms.assert_called_once_with(  # type: ignore[attr-defined]
             "testserv",
             limit=100,
             since_token=None,
@@ -1446,12 +1449,12 @@ class PublicRoomsTestRemoteSearchFallbackTestCase(unittest.HomeserverTestCase):
             third_party_instance_id=None,
         )
 
-    def test_fallback(self):
+    def test_fallback(self) -> None:
         "Test that searching public rooms over federation falls back if it gets a 404"
 
         # The `get_public_rooms` should be called again if the first call fails
         # with a 404, when using search filters.
-        self.federation_client.get_public_rooms.side_effect = (
+        self.federation_client.get_public_rooms.side_effect = (  # type: ignore[attr-defined]
             HttpResponseException(404, "Not Found", b""),
             defer.succeed({}),
         )
@@ -1466,7 +1469,7 @@ class PublicRoomsTestRemoteSearchFallbackTestCase(unittest.HomeserverTestCase):
         )
         self.assertEqual(channel.code, 200, channel.result)
 
-        self.federation_client.get_public_rooms.assert_has_calls(
+        self.federation_client.get_public_rooms.assert_has_calls(  # type: ignore[attr-defined]
             [
                 call(
                     "testserv",
@@ -1497,14 +1500,14 @@ class PerRoomProfilesForbiddenTestCase(unittest.HomeserverTestCase):
         profile.register_servlets,
     ]
 
-    def make_homeserver(self, reactor, clock):
+    def make_homeserver(self, reactor: MemoryReactor, clock: Clock) -> HomeServer:
         config = self.default_config()
         config["allow_per_room_profiles"] = False
         self.hs = self.setup_test_homeserver(config=config)
 
         return self.hs
 
-    def prepare(self, reactor, clock, homeserver):
+    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
         self.user_id = self.register_user("test", "test")
         self.tok = self.login("test", "test")
 
@@ -1522,7 +1525,7 @@ class PerRoomProfilesForbiddenTestCase(unittest.HomeserverTestCase):
 
         self.room_id = self.helper.create_room_as(self.user_id, tok=self.tok)
 
-    def test_per_room_profile_forbidden(self):
+    def test_per_room_profile_forbidden(self) -> None:
         data = {"membership": "join", "displayname": "other test user"}
         request_data = json.dumps(data)
         channel = self.make_request(
@@ -1557,7 +1560,7 @@ class RoomMembershipReasonTestCase(unittest.HomeserverTestCase):
         login.register_servlets,
     ]
 
-    def prepare(self, reactor, clock, homeserver):
+    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
         self.creator = self.register_user("creator", "test")
         self.creator_tok = self.login("creator", "test")
 
@@ -1566,7 +1569,7 @@ class RoomMembershipReasonTestCase(unittest.HomeserverTestCase):
 
         self.room_id = self.helper.create_room_as(self.creator, tok=self.creator_tok)
 
-    def test_join_reason(self):
+    def test_join_reason(self) -> None:
         reason = "hello"
         channel = self.make_request(
             "POST",
@@ -1578,7 +1581,7 @@ class RoomMembershipReasonTestCase(unittest.HomeserverTestCase):
 
         self._check_for_reason(reason)
 
-    def test_leave_reason(self):
+    def test_leave_reason(self) -> None:
         self.helper.join(self.room_id, user=self.second_user_id, tok=self.second_tok)
 
         reason = "hello"
@@ -1592,7 +1595,7 @@ class RoomMembershipReasonTestCase(unittest.HomeserverTestCase):
 
         self._check_for_reason(reason)
 
-    def test_kick_reason(self):
+    def test_kick_reason(self) -> None:
         self.helper.join(self.room_id, user=self.second_user_id, tok=self.second_tok)
 
         reason = "hello"
@@ -1606,7 +1609,7 @@ class RoomMembershipReasonTestCase(unittest.HomeserverTestCase):
 
         self._check_for_reason(reason)
 
-    def test_ban_reason(self):
+    def test_ban_reason(self) -> None:
         self.helper.join(self.room_id, user=self.second_user_id, tok=self.second_tok)
 
         reason = "hello"
@@ -1620,7 +1623,7 @@ class RoomMembershipReasonTestCase(unittest.HomeserverTestCase):
 
         self._check_for_reason(reason)
 
-    def test_unban_reason(self):
+    def test_unban_reason(self) -> None:
         reason = "hello"
         channel = self.make_request(
             "POST",
@@ -1632,7 +1635,7 @@ class RoomMembershipReasonTestCase(unittest.HomeserverTestCase):
 
         self._check_for_reason(reason)
 
-    def test_invite_reason(self):
+    def test_invite_reason(self) -> None:
         reason = "hello"
         channel = self.make_request(
             "POST",
@@ -1644,7 +1647,7 @@ class RoomMembershipReasonTestCase(unittest.HomeserverTestCase):
 
         self._check_for_reason(reason)
 
-    def test_reject_invite_reason(self):
+    def test_reject_invite_reason(self) -> None:
         self.helper.invite(
             self.room_id,
             src=self.creator,
@@ -1663,7 +1666,7 @@ class RoomMembershipReasonTestCase(unittest.HomeserverTestCase):
 
         self._check_for_reason(reason)
 
-    def _check_for_reason(self, reason):
+    def _check_for_reason(self, reason: str) -> None:
         channel = self.make_request(
             "GET",
             "/_matrix/client/r0/rooms/{}/state/m.room.member/{}".format(
@@ -1704,12 +1707,12 @@ class LabelsTestCase(unittest.HomeserverTestCase):
         "org.matrix.not_labels": ["#notfun"],
     }
 
-    def prepare(self, reactor, clock, homeserver):
+    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
         self.user_id = self.register_user("test", "test")
         self.tok = self.login("test", "test")
         self.room_id = self.helper.create_room_as(self.user_id, tok=self.tok)
 
-    def test_context_filter_labels(self):
+    def test_context_filter_labels(self) -> None:
         """Test that we can filter by a label on a /context request."""
         event_id = self._send_labelled_messages_in_room()
 
@@ -1739,7 +1742,7 @@ class LabelsTestCase(unittest.HomeserverTestCase):
             events_after[0]["content"]["body"], "with right label", events_after[0]
         )
 
-    def test_context_filter_not_labels(self):
+    def test_context_filter_not_labels(self) -> None:
         """Test that we can filter by the absence of a label on a /context request."""
         event_id = self._send_labelled_messages_in_room()
 
@@ -1772,7 +1775,7 @@ class LabelsTestCase(unittest.HomeserverTestCase):
             events_after[1]["content"]["body"], "with two wrong labels", events_after[1]
         )
 
-    def test_context_filter_labels_not_labels(self):
+    def test_context_filter_labels_not_labels(self) -> None:
         """Test that we can filter by both a label and the absence of another label on a
         /context request.
         """
@@ -1801,7 +1804,7 @@ class LabelsTestCase(unittest.HomeserverTestCase):
             events_after[0]["content"]["body"], "with wrong label", events_after[0]
         )
 
-    def test_messages_filter_labels(self):
+    def test_messages_filter_labels(self) -> None:
         """Test that we can filter by a label on a /messages request."""
         self._send_labelled_messages_in_room()
 
@@ -1818,7 +1821,7 @@ class LabelsTestCase(unittest.HomeserverTestCase):
         self.assertEqual(events[0]["content"]["body"], "with right label", events[0])
         self.assertEqual(events[1]["content"]["body"], "with right label", events[1])
 
-    def test_messages_filter_not_labels(self):
+    def test_messages_filter_not_labels(self) -> None:
         """Test that we can filter by the absence of a label on a /messages request."""
         self._send_labelled_messages_in_room()
 
@@ -1839,7 +1842,7 @@ class LabelsTestCase(unittest.HomeserverTestCase):
             events[3]["content"]["body"], "with two wrong labels", events[3]
         )
 
-    def test_messages_filter_labels_not_labels(self):
+    def test_messages_filter_labels_not_labels(self) -> None:
         """Test that we can filter by both a label and the absence of another label on a
         /messages request.
         """
@@ -1862,7 +1865,7 @@ class LabelsTestCase(unittest.HomeserverTestCase):
         self.assertEqual(len(events), 1, [event["content"] for event in events])
         self.assertEqual(events[0]["content"]["body"], "with wrong label", events[0])
 
-    def test_search_filter_labels(self):
+    def test_search_filter_labels(self) -> None:
         """Test that we can filter by a label on a /search request."""
         request_data = json.dumps(
             {
@@ -1899,7 +1902,7 @@ class LabelsTestCase(unittest.HomeserverTestCase):
             results[1]["result"]["content"]["body"],
         )
 
-    def test_search_filter_not_labels(self):
+    def test_search_filter_not_labels(self) -> None:
         """Test that we can filter by the absence of a label on a /search request."""
         request_data = json.dumps(
             {
@@ -1946,7 +1949,7 @@ class LabelsTestCase(unittest.HomeserverTestCase):
             results[3]["result"]["content"]["body"],
         )
 
-    def test_search_filter_labels_not_labels(self):
+    def test_search_filter_labels_not_labels(self) -> None:
         """Test that we can filter by both a label and the absence of another label on a
         /search request.
         """
@@ -1980,7 +1983,7 @@ class LabelsTestCase(unittest.HomeserverTestCase):
             results[0]["result"]["content"]["body"],
         )
 
-    def _send_labelled_messages_in_room(self):
+    def _send_labelled_messages_in_room(self) -> str:
         """Sends several messages to a room with different labels (or without any) to test
         filtering by label.
         Returns:
@@ -2056,12 +2059,12 @@ class RelationsTestCase(unittest.HomeserverTestCase):
         login.register_servlets,
     ]
 
-    def default_config(self):
+    def default_config(self) -> Dict[str, Any]:
         config = super().default_config()
         config["experimental_features"] = {"msc3440_enabled": True}
         return config
 
-    def prepare(self, reactor, clock, homeserver):
+    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
         self.user_id = self.register_user("test", "test")
         self.tok = self.login("test", "test")
         self.room_id = self.helper.create_room_as(self.user_id, tok=self.tok)
@@ -2136,7 +2139,7 @@ class RelationsTestCase(unittest.HomeserverTestCase):
 
         return channel.json_body["chunk"]
 
-    def test_filter_relation_senders(self):
+    def test_filter_relation_senders(self) -> None:
         # Messages which second user reacted to.
         filter = {"io.element.relation_senders": [self.second_user_id]}
         chunk = self._filter_messages(filter)
@@ -2159,7 +2162,7 @@ class RelationsTestCase(unittest.HomeserverTestCase):
             [c["event_id"] for c in chunk], [self.event_id_1, self.event_id_2]
         )
 
-    def test_filter_relation_type(self):
+    def test_filter_relation_type(self) -> None:
         # Messages which have annotations.
         filter = {"io.element.relation_types": [RelationTypes.ANNOTATION]}
         chunk = self._filter_messages(filter)
@@ -2185,7 +2188,7 @@ class RelationsTestCase(unittest.HomeserverTestCase):
             [c["event_id"] for c in chunk], [self.event_id_1, self.event_id_2]
         )
 
-    def test_filter_relation_senders_and_type(self):
+    def test_filter_relation_senders_and_type(self) -> None:
         # Messages which second user reacted to.
         filter = {
             "io.element.relation_senders": [self.second_user_id],
@@ -2205,7 +2208,7 @@ class ContextTestCase(unittest.HomeserverTestCase):
         account.register_servlets,
     ]
 
-    def prepare(self, reactor, clock, homeserver):
+    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
         self.user_id = self.register_user("user", "password")
         self.tok = self.login("user", "password")
         self.room_id = self.helper.create_room_as(
@@ -2218,7 +2221,7 @@ class ContextTestCase(unittest.HomeserverTestCase):
         self.helper.invite(self.room_id, self.user_id, self.other_user_id, tok=self.tok)
         self.helper.join(self.room_id, self.other_user_id, tok=self.other_tok)
 
-    def test_erased_sender(self):
+    def test_erased_sender(self) -> None:
         """Test that an erasure request results in the requester's events being hidden
         from any new member of the room.
         """
@@ -2332,7 +2335,7 @@ class RoomAliasListTestCase(unittest.HomeserverTestCase):
         room.register_servlets,
     ]
 
-    def prepare(self, reactor, clock, homeserver):
+    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
         self.room_owner = self.register_user("room_owner", "test")
         self.room_owner_tok = self.login("room_owner", "test")
 
@@ -2340,17 +2343,17 @@ class RoomAliasListTestCase(unittest.HomeserverTestCase):
             self.room_owner, tok=self.room_owner_tok
         )
 
-    def test_no_aliases(self):
+    def test_no_aliases(self) -> None:
         res = self._get_aliases(self.room_owner_tok)
         self.assertEqual(res["aliases"], [])
 
-    def test_not_in_room(self):
+    def test_not_in_room(self) -> None:
         self.register_user("user", "test")
         user_tok = self.login("user", "test")
         res = self._get_aliases(user_tok, expected_code=403)
         self.assertEqual(res["errcode"], "M_FORBIDDEN")
 
-    def test_admin_user(self):
+    def test_admin_user(self) -> None:
         alias1 = self._random_alias()
         self._set_alias_via_directory(alias1)
 
@@ -2360,7 +2363,7 @@ class RoomAliasListTestCase(unittest.HomeserverTestCase):
         res = self._get_aliases(user_tok)
         self.assertEqual(res["aliases"], [alias1])
 
-    def test_with_aliases(self):
+    def test_with_aliases(self) -> None:
         alias1 = self._random_alias()
         alias2 = self._random_alias()
 
@@ -2370,7 +2373,7 @@ class RoomAliasListTestCase(unittest.HomeserverTestCase):
         res = self._get_aliases(self.room_owner_tok)
         self.assertEqual(set(res["aliases"]), {alias1, alias2})
 
-    def test_peekable_room(self):
+    def test_peekable_room(self) -> None:
         alias1 = self._random_alias()
         self._set_alias_via_directory(alias1)
 
@@ -2404,7 +2407,7 @@ class RoomAliasListTestCase(unittest.HomeserverTestCase):
     def _random_alias(self) -> str:
         return RoomAlias(random_string(5), self.hs.hostname).to_string()
 
-    def _set_alias_via_directory(self, alias: str, expected_code: int = 200):
+    def _set_alias_via_directory(self, alias: str, expected_code: int = 200) -> None:
         url = "/_matrix/client/r0/directory/room/" + alias
         data = {"room_id": self.room_id}
         request_data = json.dumps(data)
@@ -2423,7 +2426,7 @@ class RoomCanonicalAliasTestCase(unittest.HomeserverTestCase):
         room.register_servlets,
     ]
 
-    def prepare(self, reactor, clock, homeserver):
+    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
         self.room_owner = self.register_user("room_owner", "test")
         self.room_owner_tok = self.login("room_owner", "test")
 
@@ -2434,7 +2437,7 @@ class RoomCanonicalAliasTestCase(unittest.HomeserverTestCase):
         self.alias = "#alias:test"
         self._set_alias_via_directory(self.alias)
 
-    def _set_alias_via_directory(self, alias: str, expected_code: int = 200):
+    def _set_alias_via_directory(self, alias: str, expected_code: int = 200) -> None:
         url = "/_matrix/client/r0/directory/room/" + alias
         data = {"room_id": self.room_id}
         request_data = json.dumps(data)
@@ -2456,7 +2459,9 @@ class RoomCanonicalAliasTestCase(unittest.HomeserverTestCase):
         self.assertIsInstance(res, dict)
         return res
 
-    def _set_canonical_alias(self, content: str, expected_code: int = 200) -> JsonDict:
+    def _set_canonical_alias(
+        self, content: JsonDict, expected_code: int = 200
+    ) -> JsonDict:
         """Calls the endpoint under test. returns the json response object."""
         channel = self.make_request(
             "PUT",
@@ -2469,7 +2474,7 @@ class RoomCanonicalAliasTestCase(unittest.HomeserverTestCase):
         self.assertIsInstance(res, dict)
         return res
 
-    def test_canonical_alias(self):
+    def test_canonical_alias(self) -> None:
         """Test a basic alias message."""
         # There is no canonical alias to start with.
         self._get_canonical_alias(expected_code=404)
@@ -2488,7 +2493,7 @@ class RoomCanonicalAliasTestCase(unittest.HomeserverTestCase):
         res = self._get_canonical_alias()
         self.assertEqual(res, {})
 
-    def test_alt_aliases(self):
+    def test_alt_aliases(self) -> None:
         """Test a canonical alias message with alt_aliases."""
         # Create an alias.
         self._set_canonical_alias({"alt_aliases": [self.alias]})
@@ -2504,7 +2509,7 @@ class RoomCanonicalAliasTestCase(unittest.HomeserverTestCase):
         res = self._get_canonical_alias()
         self.assertEqual(res, {})
 
-    def test_alias_alt_aliases(self):
+    def test_alias_alt_aliases(self) -> None:
         """Test a canonical alias message with an alias and alt_aliases."""
         # Create an alias.
         self._set_canonical_alias({"alias": self.alias, "alt_aliases": [self.alias]})
@@ -2520,7 +2525,7 @@ class RoomCanonicalAliasTestCase(unittest.HomeserverTestCase):
         res = self._get_canonical_alias()
         self.assertEqual(res, {})
 
-    def test_partial_modify(self):
+    def test_partial_modify(self) -> None:
         """Test removing only the alt_aliases."""
         # Create an alias.
         self._set_canonical_alias({"alias": self.alias, "alt_aliases": [self.alias]})
@@ -2536,7 +2541,7 @@ class RoomCanonicalAliasTestCase(unittest.HomeserverTestCase):
         res = self._get_canonical_alias()
         self.assertEqual(res, {"alias": self.alias})
 
-    def test_add_alias(self):
+    def test_add_alias(self) -> None:
         """Test removing only the alt_aliases."""
         # Create an additional alias.
         second_alias = "#second:test"
@@ -2556,7 +2561,7 @@ class RoomCanonicalAliasTestCase(unittest.HomeserverTestCase):
             res, {"alias": self.alias, "alt_aliases": [self.alias, second_alias]}
         )
 
-    def test_bad_data(self):
+    def test_bad_data(self) -> None:
         """Invalid data for alt_aliases should cause errors."""
         self._set_canonical_alias({"alt_aliases": "@bad:test"}, expected_code=400)
         self._set_canonical_alias({"alt_aliases": None}, expected_code=400)
@@ -2566,7 +2571,7 @@ class RoomCanonicalAliasTestCase(unittest.HomeserverTestCase):
         self._set_canonical_alias({"alt_aliases": True}, expected_code=400)
         self._set_canonical_alias({"alt_aliases": {}}, expected_code=400)
 
-    def test_bad_alias(self):
+    def test_bad_alias(self) -> None:
         """An alias which does not point to the room raises a SynapseError."""
         self._set_canonical_alias({"alias": "@unknown:test"}, expected_code=400)
         self._set_canonical_alias({"alt_aliases": ["@unknown:test"]}, expected_code=400)
@@ -2580,13 +2585,13 @@ class ThreepidInviteTestCase(unittest.HomeserverTestCase):
         room.register_servlets,
     ]
 
-    def prepare(self, reactor, clock, homeserver):
+    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
         self.user_id = self.register_user("thomas", "hackme")
         self.tok = self.login("thomas", "hackme")
 
         self.room_id = self.helper.create_room_as(self.user_id, tok=self.tok)
 
-    def test_threepid_invite_spamcheck(self):
+    def test_threepid_invite_spamcheck(self) -> None:
         # Mock a few functions to prevent the test from failing due to failing to talk to
         # a remote IS. We keep the mock for _mock_make_and_store_3pid_invite around so we
         # can check its call_count later on during the test.
diff --git a/tests/rest/client/test_third_party_rules.py b/tests/rest/client/test_third_party_rules.py
index bfc04785b7..58f1ea11b7 100644
--- a/tests/rest/client/test_third_party_rules.py
+++ b/tests/rest/client/test_third_party_rules.py
@@ -12,16 +12,22 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 import threading
-from typing import TYPE_CHECKING, Dict, Optional, Tuple
+from typing import TYPE_CHECKING, Any, Dict, Optional, Tuple, Union
 from unittest.mock import Mock
 
+from twisted.test.proto_helpers import MemoryReactor
+
 from synapse.api.constants import EventTypes, LoginType, Membership
 from synapse.api.errors import SynapseError
+from synapse.api.room_versions import RoomVersion
 from synapse.events import EventBase
+from synapse.events.snapshot import EventContext
 from synapse.events.third_party_rules import load_legacy_third_party_event_rules
 from synapse.rest import admin
 from synapse.rest.client import account, login, profile, room
+from synapse.server import HomeServer
 from synapse.types import JsonDict, Requester, StateMap
+from synapse.util import Clock
 from synapse.util.frozenutils import unfreeze
 
 from tests import unittest
@@ -34,7 +40,7 @@ thread_local = threading.local()
 
 
 class LegacyThirdPartyRulesTestModule:
-    def __init__(self, config: Dict, module_api: "ModuleApi"):
+    def __init__(self, config: Dict, module_api: "ModuleApi") -> None:
         # keep a record of the "current" rules module, so that the test can patch
         # it if desired.
         thread_local.rules_module = self
@@ -42,32 +48,36 @@ class LegacyThirdPartyRulesTestModule:
 
     async def on_create_room(
         self, requester: Requester, config: dict, is_requester_admin: bool
-    ):
+    ) -> bool:
         return True
 
-    async def check_event_allowed(self, event: EventBase, state: StateMap[EventBase]):
+    async def check_event_allowed(
+        self, event: EventBase, state: StateMap[EventBase]
+    ) -> Union[bool, dict]:
         return True
 
     @staticmethod
-    def parse_config(config):
+    def parse_config(config: Dict[str, Any]) -> Dict[str, Any]:
         return config
 
 
 class LegacyDenyNewRooms(LegacyThirdPartyRulesTestModule):
-    def __init__(self, config: Dict, module_api: "ModuleApi"):
+    def __init__(self, config: Dict, module_api: "ModuleApi") -> None:
         super().__init__(config, module_api)
 
-    def on_create_room(
+    async def on_create_room(
         self, requester: Requester, config: dict, is_requester_admin: bool
-    ):
+    ) -> bool:
         return False
 
 
 class LegacyChangeEvents(LegacyThirdPartyRulesTestModule):
-    def __init__(self, config: Dict, module_api: "ModuleApi"):
+    def __init__(self, config: Dict, module_api: "ModuleApi") -> None:
         super().__init__(config, module_api)
 
-    async def check_event_allowed(self, event: EventBase, state: StateMap[EventBase]):
+    async def check_event_allowed(
+        self, event: EventBase, state: StateMap[EventBase]
+    ) -> JsonDict:
         d = event.get_dict()
         content = unfreeze(event.content)
         content["foo"] = "bar"
@@ -84,7 +94,7 @@ class ThirdPartyRulesTestCase(unittest.FederatingHomeserverTestCase):
         account.register_servlets,
     ]
 
-    def make_homeserver(self, reactor, clock):
+    def make_homeserver(self, reactor: MemoryReactor, clock: Clock) -> HomeServer:
         hs = self.setup_test_homeserver()
 
         load_legacy_third_party_event_rules(hs)
@@ -94,22 +104,30 @@ class ThirdPartyRulesTestCase(unittest.FederatingHomeserverTestCase):
         # Note that these checks are not relevant to this test case.
 
         # Have this homeserver auto-approve all event signature checking.
-        async def approve_all_signature_checking(_, pdu):
+        async def approve_all_signature_checking(
+            _: RoomVersion, pdu: EventBase
+        ) -> EventBase:
             return pdu
 
-        hs.get_federation_server()._check_sigs_and_hash = approve_all_signature_checking
+        hs.get_federation_server()._check_sigs_and_hash = approve_all_signature_checking  # type: ignore[assignment]
 
         # Have this homeserver skip event auth checks. This is necessary due to
         # event auth checks ensuring that events were signed by the sender's homeserver.
-        async def _check_event_auth(origin, event, context, *args, **kwargs):
+        async def _check_event_auth(
+            origin: str,
+            event: EventBase,
+            context: EventContext,
+            *args: Any,
+            **kwargs: Any,
+        ) -> EventContext:
             return context
 
-        hs.get_federation_event_handler()._check_event_auth = _check_event_auth
+        hs.get_federation_event_handler()._check_event_auth = _check_event_auth  # type: ignore[assignment]
 
         return hs
 
-    def prepare(self, reactor, clock, homeserver):
-        super().prepare(reactor, clock, homeserver)
+    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
+        super().prepare(reactor, clock, hs)
         # Create some users and a room to play with during the tests
         self.user_id = self.register_user("kermit", "monkey")
         self.invitee = self.register_user("invitee", "hackme")
@@ -121,13 +139,15 @@ class ThirdPartyRulesTestCase(unittest.FederatingHomeserverTestCase):
         except Exception:
             pass
 
-    def test_third_party_rules(self):
+    def test_third_party_rules(self) -> None:
         """Tests that a forbidden event is forbidden from being sent, but an allowed one
         can be sent.
         """
         # patch the rules module with a Mock which will return False for some event
         # types
-        async def check(ev, state):
+        async def check(
+            ev: EventBase, state: StateMap[EventBase]
+        ) -> Tuple[bool, Optional[JsonDict]]:
             return ev.type != "foo.bar.forbidden", None
 
         callback = Mock(spec=[], side_effect=check)
@@ -161,7 +181,7 @@ class ThirdPartyRulesTestCase(unittest.FederatingHomeserverTestCase):
         )
         self.assertEqual(channel.result["code"], b"403", channel.result)
 
-    def test_third_party_rules_workaround_synapse_errors_pass_through(self):
+    def test_third_party_rules_workaround_synapse_errors_pass_through(self) -> None:
         """
         Tests that the workaround introduced by https://github.com/matrix-org/synapse/pull/11042
         is functional: that SynapseErrors are passed through from check_event_allowed
@@ -172,7 +192,7 @@ class ThirdPartyRulesTestCase(unittest.FederatingHomeserverTestCase):
         """
 
         class NastyHackException(SynapseError):
-            def error_dict(self):
+            def error_dict(self) -> JsonDict:
                 """
                 This overrides SynapseError's `error_dict` to nastily inject
                 JSON into the error response.
@@ -182,7 +202,9 @@ class ThirdPartyRulesTestCase(unittest.FederatingHomeserverTestCase):
                 return result
 
         # add a callback that will raise our hacky exception
-        async def check(ev, state) -> Tuple[bool, Optional[JsonDict]]:
+        async def check(
+            ev: EventBase, state: StateMap[EventBase]
+        ) -> Tuple[bool, Optional[JsonDict]]:
             raise NastyHackException(429, "message")
 
         self.hs.get_third_party_event_rules()._check_event_allowed_callbacks = [check]
@@ -202,11 +224,13 @@ class ThirdPartyRulesTestCase(unittest.FederatingHomeserverTestCase):
             {"errcode": "M_UNKNOWN", "error": "message", "nasty": "very"},
         )
 
-    def test_cannot_modify_event(self):
+    def test_cannot_modify_event(self) -> None:
         """cannot accidentally modify an event before it is persisted"""
 
         # first patch the event checker so that it will try to modify the event
-        async def check(ev: EventBase, state):
+        async def check(
+            ev: EventBase, state: StateMap[EventBase]
+        ) -> Tuple[bool, Optional[JsonDict]]:
             ev.content = {"x": "y"}
             return True, None
 
@@ -223,10 +247,12 @@ class ThirdPartyRulesTestCase(unittest.FederatingHomeserverTestCase):
         # 500 Internal Server Error
         self.assertEqual(channel.code, 500, channel.result)
 
-    def test_modify_event(self):
+    def test_modify_event(self) -> None:
         """The module can return a modified version of the event"""
         # first patch the event checker so that it will modify the event
-        async def check(ev: EventBase, state):
+        async def check(
+            ev: EventBase, state: StateMap[EventBase]
+        ) -> Tuple[bool, Optional[JsonDict]]:
             d = ev.get_dict()
             d["content"] = {"x": "y"}
             return True, d
@@ -253,10 +279,12 @@ class ThirdPartyRulesTestCase(unittest.FederatingHomeserverTestCase):
         ev = channel.json_body
         self.assertEqual(ev["content"]["x"], "y")
 
-    def test_message_edit(self):
+    def test_message_edit(self) -> None:
         """Ensure that the module doesn't cause issues with edited messages."""
         # first patch the event checker so that it will modify the event
-        async def check(ev: EventBase, state):
+        async def check(
+            ev: EventBase, state: StateMap[EventBase]
+        ) -> Tuple[bool, Optional[JsonDict]]:
             d = ev.get_dict()
             d["content"] = {
                 "msgtype": "m.text",
@@ -315,7 +343,7 @@ class ThirdPartyRulesTestCase(unittest.FederatingHomeserverTestCase):
         ev = channel.json_body
         self.assertEqual(ev["content"]["body"], "EDITED BODY")
 
-    def test_send_event(self):
+    def test_send_event(self) -> None:
         """Tests that a module can send an event into a room via the module api"""
         content = {
             "msgtype": "m.text",
@@ -344,7 +372,7 @@ class ThirdPartyRulesTestCase(unittest.FederatingHomeserverTestCase):
             }
         }
     )
-    def test_legacy_check_event_allowed(self):
+    def test_legacy_check_event_allowed(self) -> None:
         """Tests that the wrapper for legacy check_event_allowed callbacks works
         correctly.
         """
@@ -379,13 +407,13 @@ class ThirdPartyRulesTestCase(unittest.FederatingHomeserverTestCase):
             }
         }
     )
-    def test_legacy_on_create_room(self):
+    def test_legacy_on_create_room(self) -> None:
         """Tests that the wrapper for legacy on_create_room callbacks works
         correctly.
         """
         self.helper.create_room_as(self.user_id, tok=self.tok, expect_code=403)
 
-    def test_sent_event_end_up_in_room_state(self):
+    def test_sent_event_end_up_in_room_state(self) -> None:
         """Tests that a state event sent by a module while processing another state event
         doesn't get dropped from the state of the room. This is to guard against a bug
         where Synapse has been observed doing so, see https://github.com/matrix-org/synapse/issues/10830
@@ -400,7 +428,9 @@ class ThirdPartyRulesTestCase(unittest.FederatingHomeserverTestCase):
         api = self.hs.get_module_api()
 
         # Define a callback that sends a custom event on power levels update.
-        async def test_fn(event: EventBase, state_events):
+        async def test_fn(
+            event: EventBase, state_events: StateMap[EventBase]
+        ) -> Tuple[bool, Optional[JsonDict]]:
             if event.is_state and event.type == EventTypes.PowerLevels:
                 await api.create_and_send_event_into_room(
                     {
@@ -436,7 +466,7 @@ class ThirdPartyRulesTestCase(unittest.FederatingHomeserverTestCase):
             self.assertEqual(channel.code, 200)
             self.assertEqual(channel.json_body["i"], i)
 
-    def test_on_new_event(self):
+    def test_on_new_event(self) -> None:
         """Test that the on_new_event callback is called on new events"""
         on_new_event = Mock(make_awaitable(None))
         self.hs.get_third_party_event_rules()._on_new_event_callbacks.append(
@@ -501,7 +531,7 @@ class ThirdPartyRulesTestCase(unittest.FederatingHomeserverTestCase):
 
         self.assertEqual(channel.code, 200, channel.result)
 
-    def _update_power_levels(self, event_default: int = 0):
+    def _update_power_levels(self, event_default: int = 0) -> None:
         """Updates the room's power levels.
 
         Args:
@@ -533,7 +563,7 @@ class ThirdPartyRulesTestCase(unittest.FederatingHomeserverTestCase):
             tok=self.tok,
         )
 
-    def test_on_profile_update(self):
+    def test_on_profile_update(self) -> None:
         """Tests that the on_profile_update module callback is correctly called on
         profile updates.
         """
@@ -592,7 +622,7 @@ class ThirdPartyRulesTestCase(unittest.FederatingHomeserverTestCase):
         self.assertEqual(profile_info.display_name, displayname)
         self.assertEqual(profile_info.avatar_url, avatar_url)
 
-    def test_on_profile_update_admin(self):
+    def test_on_profile_update_admin(self) -> None:
         """Tests that the on_profile_update module callback is correctly called on
         profile updates triggered by a server admin.
         """
@@ -634,7 +664,7 @@ class ThirdPartyRulesTestCase(unittest.FederatingHomeserverTestCase):
         self.assertEqual(profile_info.display_name, displayname)
         self.assertEqual(profile_info.avatar_url, avatar_url)
 
-    def test_on_user_deactivation_status_changed(self):
+    def test_on_user_deactivation_status_changed(self) -> None:
         """Tests that the on_user_deactivation_status_changed module callback is called
         correctly when processing a user's deactivation.
         """
@@ -691,7 +721,7 @@ class ThirdPartyRulesTestCase(unittest.FederatingHomeserverTestCase):
         args = profile_mock.call_args[0]
         self.assertTrue(args[3])
 
-    def test_on_user_deactivation_status_changed_admin(self):
+    def test_on_user_deactivation_status_changed_admin(self) -> None:
         """Tests that the on_user_deactivation_status_changed module callback is called
         correctly when processing a user's deactivation triggered by a server admin as
         well as a reactivation.
diff --git a/tests/rest/client/test_typing.py b/tests/rest/client/test_typing.py
index 8b2da88e8a..d6da510773 100644
--- a/tests/rest/client/test_typing.py
+++ b/tests/rest/client/test_typing.py
@@ -15,10 +15,12 @@
 
 """Tests REST events for /rooms paths."""
 
-from unittest.mock import Mock
+from twisted.test.proto_helpers import MemoryReactor
 
 from synapse.rest.client import room
+from synapse.server import HomeServer
 from synapse.types import UserID
+from synapse.util import Clock
 
 from tests import unittest
 
@@ -33,40 +35,17 @@ class RoomTypingTestCase(unittest.HomeserverTestCase):
     user = UserID.from_string(user_id)
     servlets = [room.register_servlets]
 
-    def make_homeserver(self, reactor, clock):
-
-        hs = self.setup_test_homeserver(
-            "red",
-            federation_http_client=None,
-            federation_client=Mock(),
-        )
-
+    def make_homeserver(self, reactor: MemoryReactor, clock: Clock) -> HomeServer:
+        hs = self.setup_test_homeserver("red")
         self.event_source = hs.get_event_sources().sources.typing
-
-        hs.get_federation_handler = Mock()
-
-        async def get_user_by_access_token(token=None, allow_guest=False):
-            return {
-                "user": UserID.from_string(self.auth_user_id),
-                "token_id": 1,
-                "is_guest": False,
-            }
-
-        hs.get_auth().get_user_by_access_token = get_user_by_access_token
-
-        async def _insert_client_ip(*args, **kwargs):
-            return None
-
-        hs.get_datastores().main.insert_client_ip = _insert_client_ip
-
         return hs
 
-    def prepare(self, reactor, clock, hs):
+    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
         self.room_id = self.helper.create_room_as(self.user_id)
         # Need another user to make notifications actually work
         self.helper.join(self.room_id, user="@jim:red")
 
-    def test_set_typing(self):
+    def test_set_typing(self) -> None:
         channel = self.make_request(
             "PUT",
             "/rooms/%s/typing/%s" % (self.room_id, self.user_id),
@@ -95,7 +74,7 @@ class RoomTypingTestCase(unittest.HomeserverTestCase):
             ],
         )
 
-    def test_set_not_typing(self):
+    def test_set_not_typing(self) -> None:
         channel = self.make_request(
             "PUT",
             "/rooms/%s/typing/%s" % (self.room_id, self.user_id),
@@ -103,7 +82,7 @@ class RoomTypingTestCase(unittest.HomeserverTestCase):
         )
         self.assertEqual(200, channel.code)
 
-    def test_typing_timeout(self):
+    def test_typing_timeout(self) -> None:
         channel = self.make_request(
             "PUT",
             "/rooms/%s/typing/%s" % (self.room_id, self.user_id),
diff --git a/tests/rest/key/v2/test_remote_key_resource.py b/tests/rest/key/v2/test_remote_key_resource.py
index 4672a68596..978c252f84 100644
--- a/tests/rest/key/v2/test_remote_key_resource.py
+++ b/tests/rest/key/v2/test_remote_key_resource.py
@@ -13,19 +13,24 @@
 # limitations under the License.
 import urllib.parse
 from io import BytesIO, StringIO
+from typing import Any, Dict, Optional, Union
 from unittest.mock import Mock
 
 import signedjson.key
 from canonicaljson import encode_canonical_json
-from nacl.signing import SigningKey
 from signedjson.sign import sign_json
+from signedjson.types import SigningKey
 
-from twisted.web.resource import NoResource
+from twisted.test.proto_helpers import MemoryReactor
+from twisted.web.resource import NoResource, Resource
 
 from synapse.crypto.keyring import PerspectivesKeyFetcher
 from synapse.http.site import SynapseRequest
 from synapse.rest.key.v2 import KeyApiV2Resource
+from synapse.server import HomeServer
 from synapse.storage.keys import FetchKeyResult
+from synapse.types import JsonDict
+from synapse.util import Clock
 from synapse.util.httpresourcetree import create_resource_tree
 from synapse.util.stringutils import random_string
 
@@ -35,11 +40,11 @@ from tests.utils import default_config
 
 
 class BaseRemoteKeyResourceTestCase(unittest.HomeserverTestCase):
-    def make_homeserver(self, reactor, clock):
+    def make_homeserver(self, reactor: MemoryReactor, clock: Clock) -> HomeServer:
         self.http_client = Mock()
         return self.setup_test_homeserver(federation_http_client=self.http_client)
 
-    def create_test_resource(self):
+    def create_test_resource(self) -> Resource:
         return create_resource_tree(
             {"/_matrix/key/v2": KeyApiV2Resource(self.hs)}, root_resource=NoResource()
         )
@@ -51,7 +56,12 @@ class BaseRemoteKeyResourceTestCase(unittest.HomeserverTestCase):
         Tell the mock http client to expect an outgoing GET request for the given key
         """
 
-        async def get_json(destination, path, ignore_backoff=False, **kwargs):
+        async def get_json(
+            destination: str,
+            path: str,
+            ignore_backoff: bool = False,
+            **kwargs: Any,
+        ) -> Union[JsonDict, list]:
             self.assertTrue(ignore_backoff)
             self.assertEqual(destination, server_name)
             key_id = "%s:%s" % (signing_key.alg, signing_key.version)
@@ -84,7 +94,8 @@ class RemoteKeyResourceTestCase(BaseRemoteKeyResourceTestCase):
         Checks that the response is a 200 and returns the decoded json body.
         """
         channel = FakeChannel(self.site, self.reactor)
-        req = SynapseRequest(channel, self.site)
+        # channel is a `FakeChannel` but `HTTPChannel` is expected
+        req = SynapseRequest(channel, self.site)  # type: ignore[arg-type]
         req.content = BytesIO(b"")
         req.requestReceived(
             b"GET",
@@ -97,7 +108,7 @@ class RemoteKeyResourceTestCase(BaseRemoteKeyResourceTestCase):
         resp = channel.json_body
         return resp
 
-    def test_get_key(self):
+    def test_get_key(self) -> None:
         """Fetch a remote key"""
         SERVER_NAME = "remote.server"
         testkey = signedjson.key.generate_signing_key("ver1")
@@ -114,7 +125,7 @@ class RemoteKeyResourceTestCase(BaseRemoteKeyResourceTestCase):
         self.assertIn(SERVER_NAME, keys[0]["signatures"])
         self.assertIn(self.hs.hostname, keys[0]["signatures"])
 
-    def test_get_own_key(self):
+    def test_get_own_key(self) -> None:
         """Fetch our own key"""
         testkey = signedjson.key.generate_signing_key("ver1")
         self.expect_outgoing_key_request(self.hs.hostname, testkey)
@@ -141,7 +152,7 @@ class EndToEndPerspectivesTests(BaseRemoteKeyResourceTestCase):
     endpoint, to check that the two implementations are compatible.
     """
 
-    def default_config(self):
+    def default_config(self) -> Dict[str, Any]:
         config = super().default_config()
 
         # replace the signing key with our own
@@ -152,7 +163,7 @@ class EndToEndPerspectivesTests(BaseRemoteKeyResourceTestCase):
 
         return config
 
-    def prepare(self, reactor, clock, homeserver):
+    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
         # make a second homeserver, configured to use the first one as a key notary
         self.http_client2 = Mock()
         config = default_config(name="keyclient")
@@ -175,7 +186,9 @@ class EndToEndPerspectivesTests(BaseRemoteKeyResourceTestCase):
 
         # wire up outbound POST /key/v2/query requests from hs2 so that they
         # will be forwarded to hs1
-        async def post_json(destination, path, data):
+        async def post_json(
+            destination: str, path: str, data: Optional[JsonDict] = None
+        ) -> Union[JsonDict, list]:
             self.assertEqual(destination, self.hs.hostname)
             self.assertEqual(
                 path,
@@ -183,7 +196,8 @@ class EndToEndPerspectivesTests(BaseRemoteKeyResourceTestCase):
             )
 
             channel = FakeChannel(self.site, self.reactor)
-            req = SynapseRequest(channel, self.site)
+            # channel is a `FakeChannel` but `HTTPChannel` is expected
+            req = SynapseRequest(channel, self.site)  # type: ignore[arg-type]
             req.content = BytesIO(encode_canonical_json(data))
 
             req.requestReceived(
@@ -198,7 +212,7 @@ class EndToEndPerspectivesTests(BaseRemoteKeyResourceTestCase):
 
         self.http_client2.post_json.side_effect = post_json
 
-    def test_get_key(self):
+    def test_get_key(self) -> None:
         """Fetch a key belonging to a random server"""
         # make up a key to be fetched.
         testkey = signedjson.key.generate_signing_key("abc")
@@ -218,7 +232,7 @@ class EndToEndPerspectivesTests(BaseRemoteKeyResourceTestCase):
             signedjson.key.encode_verify_key_base64(testkey.verify_key),
         )
 
-    def test_get_notary_key(self):
+    def test_get_notary_key(self) -> None:
         """Fetch a key belonging to the notary server"""
         # make up a key to be fetched. We randomise the keyid to try to get it to
         # appear before the key server signing key sometimes (otherwise we bail out
@@ -240,7 +254,7 @@ class EndToEndPerspectivesTests(BaseRemoteKeyResourceTestCase):
             signedjson.key.encode_verify_key_base64(testkey.verify_key),
         )
 
-    def test_get_notary_keyserver_key(self):
+    def test_get_notary_keyserver_key(self) -> None:
         """Fetch the notary's keyserver key"""
         # we expect hs1 to make a regular key request to itself
         self.expect_outgoing_key_request(self.hs.hostname, self.hs_signing_key)
diff --git a/tests/rest/media/v1/test_base.py b/tests/rest/media/v1/test_base.py
index f761e23f1b..c73179151a 100644
--- a/tests/rest/media/v1/test_base.py
+++ b/tests/rest/media/v1/test_base.py
@@ -28,11 +28,11 @@ class GetFileNameFromHeadersTests(unittest.TestCase):
         b"inline; filename*=utf-8''foo%C2%A3bar": "foo£bar",
     }
 
-    def tests(self):
+    def tests(self) -> None:
         for hdr, expected in self.TEST_CASES.items():
             res = get_filename_from_headers({b"Content-Disposition": [hdr]})
             self.assertEqual(
                 res,
                 expected,
-                "expected output for %s to be %s but was %s" % (hdr, expected, res),
+                f"expected output for {hdr!r} to be {expected} but was {res}",
             )
diff --git a/tests/rest/media/v1/test_filepath.py b/tests/rest/media/v1/test_filepath.py
index 913bc530aa..43e6f0f70a 100644
--- a/tests/rest/media/v1/test_filepath.py
+++ b/tests/rest/media/v1/test_filepath.py
@@ -21,12 +21,12 @@ from tests import unittest
 
 
 class MediaFilePathsTestCase(unittest.TestCase):
-    def setUp(self):
+    def setUp(self) -> None:
         super().setUp()
 
         self.filepaths = MediaFilePaths("/media_store")
 
-    def test_local_media_filepath(self):
+    def test_local_media_filepath(self) -> None:
         """Test local media paths"""
         self.assertEqual(
             self.filepaths.local_media_filepath_rel("GerZNDnDZVjsOtardLuwfIBg"),
@@ -37,7 +37,7 @@ class MediaFilePathsTestCase(unittest.TestCase):
             "/media_store/local_content/Ge/rZ/NDnDZVjsOtardLuwfIBg",
         )
 
-    def test_local_media_thumbnail(self):
+    def test_local_media_thumbnail(self) -> None:
         """Test local media thumbnail paths"""
         self.assertEqual(
             self.filepaths.local_media_thumbnail_rel(
@@ -52,14 +52,14 @@ class MediaFilePathsTestCase(unittest.TestCase):
             "/media_store/local_thumbnails/Ge/rZ/NDnDZVjsOtardLuwfIBg/800-600-image-jpeg-scale",
         )
 
-    def test_local_media_thumbnail_dir(self):
+    def test_local_media_thumbnail_dir(self) -> None:
         """Test local media thumbnail directory paths"""
         self.assertEqual(
             self.filepaths.local_media_thumbnail_dir("GerZNDnDZVjsOtardLuwfIBg"),
             "/media_store/local_thumbnails/Ge/rZ/NDnDZVjsOtardLuwfIBg",
         )
 
-    def test_remote_media_filepath(self):
+    def test_remote_media_filepath(self) -> None:
         """Test remote media paths"""
         self.assertEqual(
             self.filepaths.remote_media_filepath_rel(
@@ -74,7 +74,7 @@ class MediaFilePathsTestCase(unittest.TestCase):
             "/media_store/remote_content/example.com/Ge/rZ/NDnDZVjsOtardLuwfIBg",
         )
 
-    def test_remote_media_thumbnail(self):
+    def test_remote_media_thumbnail(self) -> None:
         """Test remote media thumbnail paths"""
         self.assertEqual(
             self.filepaths.remote_media_thumbnail_rel(
@@ -99,7 +99,7 @@ class MediaFilePathsTestCase(unittest.TestCase):
             "/media_store/remote_thumbnail/example.com/Ge/rZ/NDnDZVjsOtardLuwfIBg/800-600-image-jpeg-scale",
         )
 
-    def test_remote_media_thumbnail_legacy(self):
+    def test_remote_media_thumbnail_legacy(self) -> None:
         """Test old-style remote media thumbnail paths"""
         self.assertEqual(
             self.filepaths.remote_media_thumbnail_rel_legacy(
@@ -108,7 +108,7 @@ class MediaFilePathsTestCase(unittest.TestCase):
             "remote_thumbnail/example.com/Ge/rZ/NDnDZVjsOtardLuwfIBg/800-600-image-jpeg",
         )
 
-    def test_remote_media_thumbnail_dir(self):
+    def test_remote_media_thumbnail_dir(self) -> None:
         """Test remote media thumbnail directory paths"""
         self.assertEqual(
             self.filepaths.remote_media_thumbnail_dir(
@@ -117,7 +117,7 @@ class MediaFilePathsTestCase(unittest.TestCase):
             "/media_store/remote_thumbnail/example.com/Ge/rZ/NDnDZVjsOtardLuwfIBg",
         )
 
-    def test_url_cache_filepath(self):
+    def test_url_cache_filepath(self) -> None:
         """Test URL cache paths"""
         self.assertEqual(
             self.filepaths.url_cache_filepath_rel("2020-01-02_GerZNDnDZVjsOtar"),
@@ -128,7 +128,7 @@ class MediaFilePathsTestCase(unittest.TestCase):
             "/media_store/url_cache/2020-01-02/GerZNDnDZVjsOtar",
         )
 
-    def test_url_cache_filepath_legacy(self):
+    def test_url_cache_filepath_legacy(self) -> None:
         """Test old-style URL cache paths"""
         self.assertEqual(
             self.filepaths.url_cache_filepath_rel("GerZNDnDZVjsOtardLuwfIBg"),
@@ -139,7 +139,7 @@ class MediaFilePathsTestCase(unittest.TestCase):
             "/media_store/url_cache/Ge/rZ/NDnDZVjsOtardLuwfIBg",
         )
 
-    def test_url_cache_filepath_dirs_to_delete(self):
+    def test_url_cache_filepath_dirs_to_delete(self) -> None:
         """Test URL cache cleanup paths"""
         self.assertEqual(
             self.filepaths.url_cache_filepath_dirs_to_delete(
@@ -148,7 +148,7 @@ class MediaFilePathsTestCase(unittest.TestCase):
             ["/media_store/url_cache/2020-01-02"],
         )
 
-    def test_url_cache_filepath_dirs_to_delete_legacy(self):
+    def test_url_cache_filepath_dirs_to_delete_legacy(self) -> None:
         """Test old-style URL cache cleanup paths"""
         self.assertEqual(
             self.filepaths.url_cache_filepath_dirs_to_delete(
@@ -160,7 +160,7 @@ class MediaFilePathsTestCase(unittest.TestCase):
             ],
         )
 
-    def test_url_cache_thumbnail(self):
+    def test_url_cache_thumbnail(self) -> None:
         """Test URL cache thumbnail paths"""
         self.assertEqual(
             self.filepaths.url_cache_thumbnail_rel(
@@ -175,7 +175,7 @@ class MediaFilePathsTestCase(unittest.TestCase):
             "/media_store/url_cache_thumbnails/2020-01-02/GerZNDnDZVjsOtar/800-600-image-jpeg-scale",
         )
 
-    def test_url_cache_thumbnail_legacy(self):
+    def test_url_cache_thumbnail_legacy(self) -> None:
         """Test old-style URL cache thumbnail paths"""
         self.assertEqual(
             self.filepaths.url_cache_thumbnail_rel(
@@ -190,7 +190,7 @@ class MediaFilePathsTestCase(unittest.TestCase):
             "/media_store/url_cache_thumbnails/Ge/rZ/NDnDZVjsOtardLuwfIBg/800-600-image-jpeg-scale",
         )
 
-    def test_url_cache_thumbnail_directory(self):
+    def test_url_cache_thumbnail_directory(self) -> None:
         """Test URL cache thumbnail directory paths"""
         self.assertEqual(
             self.filepaths.url_cache_thumbnail_directory_rel(
@@ -203,7 +203,7 @@ class MediaFilePathsTestCase(unittest.TestCase):
             "/media_store/url_cache_thumbnails/2020-01-02/GerZNDnDZVjsOtar",
         )
 
-    def test_url_cache_thumbnail_directory_legacy(self):
+    def test_url_cache_thumbnail_directory_legacy(self) -> None:
         """Test old-style URL cache thumbnail directory paths"""
         self.assertEqual(
             self.filepaths.url_cache_thumbnail_directory_rel(
@@ -216,7 +216,7 @@ class MediaFilePathsTestCase(unittest.TestCase):
             "/media_store/url_cache_thumbnails/Ge/rZ/NDnDZVjsOtardLuwfIBg",
         )
 
-    def test_url_cache_thumbnail_dirs_to_delete(self):
+    def test_url_cache_thumbnail_dirs_to_delete(self) -> None:
         """Test URL cache thumbnail cleanup paths"""
         self.assertEqual(
             self.filepaths.url_cache_thumbnail_dirs_to_delete(
@@ -228,7 +228,7 @@ class MediaFilePathsTestCase(unittest.TestCase):
             ],
         )
 
-    def test_url_cache_thumbnail_dirs_to_delete_legacy(self):
+    def test_url_cache_thumbnail_dirs_to_delete_legacy(self) -> None:
         """Test old-style URL cache thumbnail cleanup paths"""
         self.assertEqual(
             self.filepaths.url_cache_thumbnail_dirs_to_delete(
@@ -241,7 +241,7 @@ class MediaFilePathsTestCase(unittest.TestCase):
             ],
         )
 
-    def test_server_name_validation(self):
+    def test_server_name_validation(self) -> None:
         """Test validation of server names"""
         self._test_path_validation(
             [
@@ -274,7 +274,7 @@ class MediaFilePathsTestCase(unittest.TestCase):
             ],
         )
 
-    def test_file_id_validation(self):
+    def test_file_id_validation(self) -> None:
         """Test validation of local, remote and legacy URL cache file / media IDs"""
         # File / media IDs get split into three parts to form paths, consisting of the
         # first two characters, next two characters and rest of the ID.
@@ -357,7 +357,7 @@ class MediaFilePathsTestCase(unittest.TestCase):
             invalid_values=invalid_file_ids,
         )
 
-    def test_url_cache_media_id_validation(self):
+    def test_url_cache_media_id_validation(self) -> None:
         """Test validation of URL cache media IDs"""
         self._test_path_validation(
             [
@@ -387,7 +387,7 @@ class MediaFilePathsTestCase(unittest.TestCase):
             ],
         )
 
-    def test_content_type_validation(self):
+    def test_content_type_validation(self) -> None:
         """Test validation of thumbnail content types"""
         self._test_path_validation(
             [
@@ -410,7 +410,7 @@ class MediaFilePathsTestCase(unittest.TestCase):
             ],
         )
 
-    def test_thumbnail_method_validation(self):
+    def test_thumbnail_method_validation(self) -> None:
         """Test validation of thumbnail methods"""
         self._test_path_validation(
             [
@@ -440,7 +440,7 @@ class MediaFilePathsTestCase(unittest.TestCase):
         parameter: str,
         valid_values: Iterable[str],
         invalid_values: Iterable[str],
-    ):
+    ) -> None:
         """Test that the specified methods validate the named parameter as expected
 
         Args:
diff --git a/tests/rest/media/v1/test_html_preview.py b/tests/rest/media/v1/test_html_preview.py
index a4b57e3d1f..3fb37a2a59 100644
--- a/tests/rest/media/v1/test_html_preview.py
+++ b/tests/rest/media/v1/test_html_preview.py
@@ -32,7 +32,7 @@ class SummarizeTestCase(unittest.TestCase):
     if not lxml:
         skip = "url preview feature requires lxml"
 
-    def test_long_summarize(self):
+    def test_long_summarize(self) -> None:
         example_paras = [
             """Tromsø (Norwegian pronunciation: [ˈtrʊmsœ] ( listen); Northern Sami:
             Romsa; Finnish: Tromssa[2] Kven: Tromssa) is a city and municipality in
@@ -90,7 +90,7 @@ class SummarizeTestCase(unittest.TestCase):
             " Tromsøya had a population of 36,088. Substantial parts of the urban…",
         )
 
-    def test_short_summarize(self):
+    def test_short_summarize(self) -> None:
         example_paras = [
             "Tromsø (Norwegian pronunciation: [ˈtrʊmsœ] ( listen); Northern Sami:"
             " Romsa; Finnish: Tromssa[2] Kven: Tromssa) is a city and municipality in"
@@ -117,7 +117,7 @@ class SummarizeTestCase(unittest.TestCase):
             " most of the year.",
         )
 
-    def test_small_then_large_summarize(self):
+    def test_small_then_large_summarize(self) -> None:
         example_paras = [
             "Tromsø (Norwegian pronunciation: [ˈtrʊmsœ] ( listen); Northern Sami:"
             " Romsa; Finnish: Tromssa[2] Kven: Tromssa) is a city and municipality in"
@@ -150,7 +150,7 @@ class CalcOgTestCase(unittest.TestCase):
     if not lxml:
         skip = "url preview feature requires lxml"
 
-    def test_simple(self):
+    def test_simple(self) -> None:
         html = b"""
         <html>
         <head><title>Foo</title></head>
@@ -165,7 +165,7 @@ class CalcOgTestCase(unittest.TestCase):
 
         self.assertEqual(og, {"og:title": "Foo", "og:description": "Some text."})
 
-    def test_comment(self):
+    def test_comment(self) -> None:
         html = b"""
         <html>
         <head><title>Foo</title></head>
@@ -181,7 +181,7 @@ class CalcOgTestCase(unittest.TestCase):
 
         self.assertEqual(og, {"og:title": "Foo", "og:description": "Some text."})
 
-    def test_comment2(self):
+    def test_comment2(self) -> None:
         html = b"""
         <html>
         <head><title>Foo</title></head>
@@ -206,7 +206,7 @@ class CalcOgTestCase(unittest.TestCase):
             },
         )
 
-    def test_script(self):
+    def test_script(self) -> None:
         html = b"""
         <html>
         <head><title>Foo</title></head>
@@ -222,7 +222,7 @@ class CalcOgTestCase(unittest.TestCase):
 
         self.assertEqual(og, {"og:title": "Foo", "og:description": "Some text."})
 
-    def test_missing_title(self):
+    def test_missing_title(self) -> None:
         html = b"""
         <html>
         <body>
@@ -236,7 +236,7 @@ class CalcOgTestCase(unittest.TestCase):
 
         self.assertEqual(og, {"og:title": None, "og:description": "Some text."})
 
-    def test_h1_as_title(self):
+    def test_h1_as_title(self) -> None:
         html = b"""
         <html>
         <meta property="og:description" content="Some text."/>
@@ -251,7 +251,7 @@ class CalcOgTestCase(unittest.TestCase):
 
         self.assertEqual(og, {"og:title": "Title", "og:description": "Some text."})
 
-    def test_missing_title_and_broken_h1(self):
+    def test_missing_title_and_broken_h1(self) -> None:
         html = b"""
         <html>
         <body>
@@ -266,19 +266,19 @@ class CalcOgTestCase(unittest.TestCase):
 
         self.assertEqual(og, {"og:title": None, "og:description": "Some text."})
 
-    def test_empty(self):
+    def test_empty(self) -> None:
         """Test a body with no data in it."""
         html = b""
         tree = decode_body(html, "http://example.com/test.html")
         self.assertIsNone(tree)
 
-    def test_no_tree(self):
+    def test_no_tree(self) -> None:
         """A valid body with no tree in it."""
         html = b"\x00"
         tree = decode_body(html, "http://example.com/test.html")
         self.assertIsNone(tree)
 
-    def test_xml(self):
+    def test_xml(self) -> None:
         """Test decoding XML and ensure it works properly."""
         # Note that the strip() call is important to ensure the xml tag starts
         # at the initial byte.
@@ -293,7 +293,7 @@ class CalcOgTestCase(unittest.TestCase):
         og = parse_html_to_open_graph(tree, "http://example.com/test.html")
         self.assertEqual(og, {"og:title": "Foo", "og:description": "Some text."})
 
-    def test_invalid_encoding(self):
+    def test_invalid_encoding(self) -> None:
         """An invalid character encoding should be ignored and treated as UTF-8, if possible."""
         html = b"""
         <html>
@@ -307,7 +307,7 @@ class CalcOgTestCase(unittest.TestCase):
         og = parse_html_to_open_graph(tree, "http://example.com/test.html")
         self.assertEqual(og, {"og:title": "Foo", "og:description": "Some text."})
 
-    def test_invalid_encoding2(self):
+    def test_invalid_encoding2(self) -> None:
         """A body which doesn't match the sent character encoding."""
         # Note that this contains an invalid UTF-8 sequence in the title.
         html = b"""
@@ -322,7 +322,7 @@ class CalcOgTestCase(unittest.TestCase):
         og = parse_html_to_open_graph(tree, "http://example.com/test.html")
         self.assertEqual(og, {"og:title": "ÿÿ Foo", "og:description": "Some text."})
 
-    def test_windows_1252(self):
+    def test_windows_1252(self) -> None:
         """A body which uses cp1252, but doesn't declare that."""
         html = b"""
         <html>
@@ -338,7 +338,7 @@ class CalcOgTestCase(unittest.TestCase):
 
 
 class MediaEncodingTestCase(unittest.TestCase):
-    def test_meta_charset(self):
+    def test_meta_charset(self) -> None:
         """A character encoding is found via the meta tag."""
         encodings = _get_html_media_encodings(
             b"""
@@ -363,7 +363,7 @@ class MediaEncodingTestCase(unittest.TestCase):
         )
         self.assertEqual(list(encodings), ["ascii", "utf-8", "cp1252"])
 
-    def test_meta_charset_underscores(self):
+    def test_meta_charset_underscores(self) -> None:
         """A character encoding contains underscore."""
         encodings = _get_html_media_encodings(
             b"""
@@ -376,7 +376,7 @@ class MediaEncodingTestCase(unittest.TestCase):
         )
         self.assertEqual(list(encodings), ["shift_jis", "utf-8", "cp1252"])
 
-    def test_xml_encoding(self):
+    def test_xml_encoding(self) -> None:
         """A character encoding is found via the meta tag."""
         encodings = _get_html_media_encodings(
             b"""
@@ -388,7 +388,7 @@ class MediaEncodingTestCase(unittest.TestCase):
         )
         self.assertEqual(list(encodings), ["ascii", "utf-8", "cp1252"])
 
-    def test_meta_xml_encoding(self):
+    def test_meta_xml_encoding(self) -> None:
         """Meta tags take precedence over XML encoding."""
         encodings = _get_html_media_encodings(
             b"""
@@ -402,7 +402,7 @@ class MediaEncodingTestCase(unittest.TestCase):
         )
         self.assertEqual(list(encodings), ["utf-16", "ascii", "utf-8", "cp1252"])
 
-    def test_content_type(self):
+    def test_content_type(self) -> None:
         """A character encoding is found via the Content-Type header."""
         # Test a few variations of the header.
         headers = (
@@ -417,12 +417,12 @@ class MediaEncodingTestCase(unittest.TestCase):
             encodings = _get_html_media_encodings(b"", header)
             self.assertEqual(list(encodings), ["ascii", "utf-8", "cp1252"])
 
-    def test_fallback(self):
+    def test_fallback(self) -> None:
         """A character encoding cannot be found in the body or header."""
         encodings = _get_html_media_encodings(b"", "text/html")
         self.assertEqual(list(encodings), ["utf-8", "cp1252"])
 
-    def test_duplicates(self):
+    def test_duplicates(self) -> None:
         """Ensure each encoding is only attempted once."""
         encodings = _get_html_media_encodings(
             b"""
@@ -436,7 +436,7 @@ class MediaEncodingTestCase(unittest.TestCase):
         )
         self.assertEqual(list(encodings), ["utf-8", "cp1252"])
 
-    def test_unknown_invalid(self):
+    def test_unknown_invalid(self) -> None:
         """A character encoding should be ignored if it is unknown or invalid."""
         encodings = _get_html_media_encodings(
             b"""
@@ -451,7 +451,7 @@ class MediaEncodingTestCase(unittest.TestCase):
 
 
 class RebaseUrlTestCase(unittest.TestCase):
-    def test_relative(self):
+    def test_relative(self) -> None:
         """Relative URLs should be resolved based on the context of the base URL."""
         self.assertEqual(
             rebase_url("subpage", "https://example.com/foo/"),
@@ -466,14 +466,14 @@ class RebaseUrlTestCase(unittest.TestCase):
             "https://example.com/bar",
         )
 
-    def test_absolute(self):
+    def test_absolute(self) -> None:
         """Absolute URLs should not be modified."""
         self.assertEqual(
             rebase_url("https://alice.com/a/", "https://example.com/foo/"),
             "https://alice.com/a/",
         )
 
-    def test_data(self):
+    def test_data(self) -> None:
         """Data URLs should not be modified."""
         self.assertEqual(
             rebase_url("data:,Hello%2C%20World%21", "https://example.com/foo/"),
diff --git a/tests/rest/media/v1/test_oembed.py b/tests/rest/media/v1/test_oembed.py
index 048d0ca44a..f38d7225f8 100644
--- a/tests/rest/media/v1/test_oembed.py
+++ b/tests/rest/media/v1/test_oembed.py
@@ -16,7 +16,7 @@ import json
 
 from twisted.test.proto_helpers import MemoryReactor
 
-from synapse.rest.media.v1.oembed import OEmbedProvider
+from synapse.rest.media.v1.oembed import OEmbedProvider, OEmbedResult
 from synapse.server import HomeServer
 from synapse.types import JsonDict
 from synapse.util import Clock
@@ -25,15 +25,15 @@ from tests.unittest import HomeserverTestCase
 
 
 class OEmbedTests(HomeserverTestCase):
-    def prepare(self, reactor: MemoryReactor, clock: Clock, homeserver: HomeServer):
-        self.oembed = OEmbedProvider(homeserver)
+    def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
+        self.oembed = OEmbedProvider(hs)
 
-    def parse_response(self, response: JsonDict):
+    def parse_response(self, response: JsonDict) -> OEmbedResult:
         return self.oembed.parse_oembed_response(
             "https://test", json.dumps(response).encode("utf-8")
         )
 
-    def test_version(self):
+    def test_version(self) -> None:
         """Accept versions that are similar to 1.0 as a string or int (or missing)."""
         for version in ("1.0", 1.0, 1):
             result = self.parse_response({"version": version, "type": "link"})
diff --git a/tests/rest/test_health.py b/tests/rest/test_health.py
index 01d48c3860..da325955f8 100644
--- a/tests/rest/test_health.py
+++ b/tests/rest/test_health.py
@@ -11,7 +11,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-
+from http import HTTPStatus
 
 from synapse.rest.health import HealthResource
 
@@ -19,12 +19,12 @@ from tests import unittest
 
 
 class HealthCheckTests(unittest.HomeserverTestCase):
-    def create_test_resource(self):
+    def create_test_resource(self) -> HealthResource:
         # replace the JsonResource with a HealthResource.
         return HealthResource()
 
-    def test_health(self):
+    def test_health(self) -> None:
         channel = self.make_request("GET", "/health", shorthand=False)
 
-        self.assertEqual(channel.code, 200)
+        self.assertEqual(channel.code, HTTPStatus.OK)
         self.assertEqual(channel.result["body"], b"OK")
diff --git a/tests/rest/test_well_known.py b/tests/rest/test_well_known.py
index 118aa93a32..11f78f52b8 100644
--- a/tests/rest/test_well_known.py
+++ b/tests/rest/test_well_known.py
@@ -11,6 +11,8 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+from http import HTTPStatus
+
 from twisted.web.resource import Resource
 
 from synapse.rest.well_known import well_known_resource
@@ -19,7 +21,7 @@ from tests import unittest
 
 
 class WellKnownTests(unittest.HomeserverTestCase):
-    def create_test_resource(self):
+    def create_test_resource(self) -> Resource:
         # replace the JsonResource with a Resource wrapping the WellKnownResource
         res = Resource()
         res.putChild(b".well-known", well_known_resource(self.hs))
@@ -31,12 +33,12 @@ class WellKnownTests(unittest.HomeserverTestCase):
             "default_identity_server": "https://testis",
         }
     )
-    def test_client_well_known(self):
+    def test_client_well_known(self) -> None:
         channel = self.make_request(
             "GET", "/.well-known/matrix/client", shorthand=False
         )
 
-        self.assertEqual(channel.code, 200)
+        self.assertEqual(channel.code, HTTPStatus.OK)
         self.assertEqual(
             channel.json_body,
             {
@@ -50,27 +52,27 @@ class WellKnownTests(unittest.HomeserverTestCase):
             "public_baseurl": None,
         }
     )
-    def test_client_well_known_no_public_baseurl(self):
+    def test_client_well_known_no_public_baseurl(self) -> None:
         channel = self.make_request(
             "GET", "/.well-known/matrix/client", shorthand=False
         )
 
-        self.assertEqual(channel.code, 404)
+        self.assertEqual(channel.code, HTTPStatus.NOT_FOUND)
 
     @unittest.override_config({"serve_server_wellknown": True})
-    def test_server_well_known(self):
+    def test_server_well_known(self) -> None:
         channel = self.make_request(
             "GET", "/.well-known/matrix/server", shorthand=False
         )
 
-        self.assertEqual(channel.code, 200)
+        self.assertEqual(channel.code, HTTPStatus.OK)
         self.assertEqual(
             channel.json_body,
             {"m.server": "test:443"},
         )
 
-    def test_server_well_known_disabled(self):
+    def test_server_well_known_disabled(self) -> None:
         channel = self.make_request(
             "GET", "/.well-known/matrix/server", shorthand=False
         )
-        self.assertEqual(channel.code, 404)
+        self.assertEqual(channel.code, HTTPStatus.NOT_FOUND)
diff --git a/tests/test_visibility.py b/tests/test_visibility.py
index 219b5660b1..532e3fe9cd 100644
--- a/tests/test_visibility.py
+++ b/tests/test_visibility.py
@@ -13,11 +13,12 @@
 # limitations under the License.
 import logging
 from typing import Optional
+from unittest.mock import patch
 
 from synapse.api.room_versions import RoomVersions
-from synapse.events import EventBase
-from synapse.types import JsonDict
-from synapse.visibility import filter_events_for_server
+from synapse.events import EventBase, make_event_from_dict
+from synapse.types import JsonDict, create_requester
+from synapse.visibility import filter_events_for_client, filter_events_for_server
 
 from tests import unittest
 from tests.utils import create_room
@@ -185,3 +186,72 @@ class FilterEventsForServerTestCase(unittest.HomeserverTestCase):
 
         self.get_success(self.storage.persistence.persist_event(event, context))
         return event
+
+
+class FilterEventsForClientTestCase(unittest.FederatingHomeserverTestCase):
+    def test_out_of_band_invite_rejection(self):
+        # this is where we have received an invite event over federation, and then
+        # rejected it.
+        invite_pdu = {
+            "room_id": "!room:id",
+            "depth": 1,
+            "auth_events": [],
+            "prev_events": [],
+            "origin_server_ts": 1,
+            "sender": "@someone:" + self.OTHER_SERVER_NAME,
+            "type": "m.room.member",
+            "state_key": "@user:test",
+            "content": {"membership": "invite"},
+        }
+        self.add_hashes_and_signatures(invite_pdu)
+        invite_event_id = make_event_from_dict(invite_pdu, RoomVersions.V9).event_id
+
+        self.get_success(
+            self.hs.get_federation_server().on_invite_request(
+                self.OTHER_SERVER_NAME,
+                invite_pdu,
+                "9",
+            )
+        )
+
+        # stub out do_remotely_reject_invite so that we fall back to a locally-
+        # generated rejection
+        with patch.object(
+            self.hs.get_federation_handler(),
+            "do_remotely_reject_invite",
+            side_effect=Exception(),
+        ):
+            reject_event_id, _ = self.get_success(
+                self.hs.get_room_member_handler().remote_reject_invite(
+                    invite_event_id,
+                    txn_id=None,
+                    requester=create_requester("@user:test"),
+                    content={},
+                )
+            )
+
+        invite_event, reject_event = self.get_success(
+            self.hs.get_datastores().main.get_events_as_list(
+                [invite_event_id, reject_event_id]
+            )
+        )
+
+        # the invited user should be able to see both the invite and the rejection
+        self.assertEqual(
+            self.get_success(
+                filter_events_for_client(
+                    self.hs.get_storage(), "@user:test", [invite_event, reject_event]
+                )
+            ),
+            [invite_event, reject_event],
+        )
+
+        # other users should see neither
+        self.assertEqual(
+            self.get_success(
+                filter_events_for_client(
+                    self.hs.get_storage(), "@other:test", [invite_event, reject_event]
+                )
+            ),
+            [],
+        )
diff --git a/tests/util/test_async_helpers.py b/tests/util/test_async_helpers.py
index 362014f4cb..ff53ce114b 100644
--- a/tests/util/test_async_helpers.py
+++ b/tests/util/test_async_helpers.py
@@ -100,6 +100,34 @@ class ObservableDeferredTest(TestCase):
         self.assertEqual(str(results[0].value), "gah!", "observer 1 errback result")
         self.assertEqual(str(results[1].value), "gah!", "observer 2 errback result")
 
+    def test_cancellation(self):
+        """Test that cancelling an observer does not affect other observers."""
+        origin_d: "Deferred[int]" = Deferred()
+        observable = ObservableDeferred(origin_d, consumeErrors=True)
+
+        observer1 = observable.observe()
+        observer2 = observable.observe()
+        observer3 = observable.observe()
+
+        self.assertFalse(observer1.called)
+        self.assertFalse(observer2.called)
+        self.assertFalse(observer3.called)
+
+        # cancel the second observer
+        observer2.cancel()
+        self.assertFalse(observer1.called)
+        self.failureResultOf(observer2, CancelledError)
+        self.assertFalse(observer3.called)
+
+        # other observers resolve as normal
+        origin_d.callback(123)
+        self.assertEqual(observer1.result, 123, "observer 1 callback result")
+        self.assertEqual(observer3.result, 123, "observer 3 callback result")
+
+        # additional observers resolve as normal
+        observer4 = observable.observe()
+        self.assertEqual(observer4.result, 123, "observer 4 callback result")
+
 
 class TimeoutDeferredTest(TestCase):
     def setUp(self):