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-rw-r--r--tests/http/__init__.py7
-rw-r--r--tests/replication/slave/storage/test_events.py7
-rw-r--r--tests/replication/test_multi_media_repo.py14
-rw-r--r--tests/server_notices/test_resource_limits_server_notices.py10
-rw-r--r--tests/unittest.py18
5 files changed, 30 insertions, 26 deletions
diff --git a/tests/http/__init__.py b/tests/http/__init__.py
index e74f7f5b48..093537adef 100644
--- a/tests/http/__init__.py
+++ b/tests/http/__init__.py
@@ -13,6 +13,7 @@
 # limitations under the License.
 import os.path
 import subprocess
+from typing import List
 
 from zope.interface import implementer
 
@@ -70,14 +71,14 @@ subjectAltName = %(sanentries)s
 """
 
 
-def create_test_cert_file(sanlist):
+def create_test_cert_file(sanlist: List[bytes]) -> str:
     """build an x509 certificate file
 
     Args:
-        sanlist: list[bytes]: a list of subjectAltName values for the cert
+        sanlist: a list of subjectAltName values for the cert
 
     Returns:
-        str: the path to the file
+        The path to the file
     """
     global cert_file_count
     csr_filename = "server.csr"
diff --git a/tests/replication/slave/storage/test_events.py b/tests/replication/slave/storage/test_events.py
index 96f3880923..dce71f7334 100644
--- a/tests/replication/slave/storage/test_events.py
+++ b/tests/replication/slave/storage/test_events.py
@@ -143,6 +143,7 @@ class EventsWorkerStoreTestCase(BaseSlavedStoreTestCase):
         self.persist(type="m.room.create", key="", creator=USER_ID)
         self.check("get_invited_rooms_for_local_user", [USER_ID_2], [])
         event = self.persist(type="m.room.member", key=USER_ID_2, membership="invite")
+        assert event.internal_metadata.stream_ordering is not None
 
         self.replicate()
 
@@ -230,6 +231,7 @@ class EventsWorkerStoreTestCase(BaseSlavedStoreTestCase):
         j2 = self.persist(
             type="m.room.member", sender=USER_ID_2, key=USER_ID_2, membership="join"
         )
+        assert j2.internal_metadata.stream_ordering is not None
         self.replicate()
 
         expected_pos = PersistedEventPosition(
@@ -287,6 +289,7 @@ class EventsWorkerStoreTestCase(BaseSlavedStoreTestCase):
             )
         )
         self.replicate()
+        assert j2.internal_metadata.stream_ordering is not None
 
         event_source = RoomEventSource(self.hs)
         event_source.store = self.slaved_store
@@ -336,10 +339,10 @@ class EventsWorkerStoreTestCase(BaseSlavedStoreTestCase):
 
     event_id = 0
 
-    def persist(self, backfill=False, **kwargs):
+    def persist(self, backfill=False, **kwargs) -> FrozenEvent:
         """
         Returns:
-            synapse.events.FrozenEvent: The event that was persisted.
+            The event that was persisted.
         """
         event, context = self.build_event(**kwargs)
 
diff --git a/tests/replication/test_multi_media_repo.py b/tests/replication/test_multi_media_repo.py
index 13aa5eb51a..96cdf2c45b 100644
--- a/tests/replication/test_multi_media_repo.py
+++ b/tests/replication/test_multi_media_repo.py
@@ -15,8 +15,9 @@ import logging
 import os
 from typing import Optional, Tuple
 
+from twisted.internet.interfaces import IOpenSSLServerConnectionCreator
 from twisted.internet.protocol import Factory
-from twisted.protocols.tls import TLSMemoryBIOFactory
+from twisted.protocols.tls import TLSMemoryBIOFactory, TLSMemoryBIOProtocol
 from twisted.web.http import HTTPChannel
 from twisted.web.server import Request
 
@@ -102,7 +103,7 @@ class MediaRepoShardTestCase(BaseMultiWorkerStreamTestCase):
         )
 
         # fish the test server back out of the server-side TLS protocol.
-        http_server = server_tls_protocol.wrappedProtocol
+        http_server: HTTPChannel = server_tls_protocol.wrappedProtocol  # type: ignore[assignment]
 
         # give the reactor a pump to get the TLS juices flowing.
         self.reactor.pump((0.1,))
@@ -238,16 +239,15 @@ def get_connection_factory():
     return test_server_connection_factory
 
 
-def _build_test_server(connection_creator):
+def _build_test_server(
+    connection_creator: IOpenSSLServerConnectionCreator,
+) -> TLSMemoryBIOProtocol:
     """Construct a test server
 
     This builds an HTTP channel, wrapped with a TLSMemoryBIOProtocol
 
     Args:
-        connection_creator (IOpenSSLServerConnectionCreator): thing to build
-            SSL connections
-        sanlist (list[bytes]): list of the SAN entries for the cert returned
-            by the server
+        connection_creator: thing to build SSL connections
 
     Returns:
         TLSMemoryBIOProtocol
diff --git a/tests/server_notices/test_resource_limits_server_notices.py b/tests/server_notices/test_resource_limits_server_notices.py
index bf403045e9..7cbc40736c 100644
--- a/tests/server_notices/test_resource_limits_server_notices.py
+++ b/tests/server_notices/test_resource_limits_server_notices.py
@@ -11,6 +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 typing import Tuple
 from unittest.mock import Mock
 
 from twisted.test.proto_helpers import MemoryReactor
@@ -350,14 +351,15 @@ class TestResourceLimitsServerNoticesWithRealRooms(unittest.HomeserverTestCase):
 
         self.assertTrue(notice_in_room, "No server notice in room")
 
-    def _trigger_notice_and_join(self):
+    def _trigger_notice_and_join(self) -> Tuple[str, str, str]:
         """Creates enough active users to hit the MAU limit and trigger a system notice
         about it, then joins the system notices room with one of the users created.
 
         Returns:
-            user_id (str): The ID of the user that joined the room.
-            tok (str): The access token of the user that joined the room.
-            room_id (str): The ID of the room that's been joined.
+            A tuple of:
+                user_id: The ID of the user that joined the room.
+                tok: The access token of the user that joined the room.
+                room_id: The ID of the room that's been joined.
         """
         user_id = None
         tok = None
diff --git a/tests/unittest.py b/tests/unittest.py
index 5116be338e..a120c2976c 100644
--- a/tests/unittest.py
+++ b/tests/unittest.py
@@ -360,13 +360,13 @@ class HomeserverTestCase(TestCase):
                 store.db_pool.updates.do_next_background_update(False), by=0.1
             )
 
-    def make_homeserver(self, reactor, clock):
+    def make_homeserver(self, reactor: MemoryReactor, clock: Clock):
         """
         Make and return a homeserver.
 
         Args:
             reactor: A Twisted Reactor, or something that pretends to be one.
-            clock (synapse.util.Clock): The Clock, associated with the reactor.
+            clock: The Clock, associated with the reactor.
 
         Returns:
             A homeserver suitable for testing.
@@ -426,9 +426,8 @@ class HomeserverTestCase(TestCase):
 
         Args:
             reactor: A Twisted Reactor, or something that pretends to be one.
-            clock (synapse.util.Clock): The Clock, associated with the reactor.
-            homeserver (synapse.server.HomeServer): The HomeServer to test
-            against.
+            clock: The Clock, associated with the reactor.
+            homeserver: The HomeServer to test against.
 
         Function to optionally be overridden in subclasses.
         """
@@ -452,11 +451,10 @@ class HomeserverTestCase(TestCase):
         given content.
 
         Args:
-            method (bytes/unicode): The HTTP request method ("verb").
-            path (bytes/unicode): The HTTP path, suitably URL encoded (e.g.
-            escaped UTF-8 & spaces and such).
-            content (bytes or dict): The body of the request. JSON-encoded, if
-            a dict.
+            method: The HTTP request method ("verb").
+            path: The HTTP path, suitably URL encoded (e.g. escaped UTF-8 & spaces
+                and such). content (bytes or dict): The body of the request.
+                JSON-encoded, if a dict.
             shorthand: Whether to try and be helpful and prefix the given URL
             with the usual REST API path, if it doesn't contain it.
             federation_auth_origin: if set to not-None, we will add a fake