Bump mypy-zope & mypy. (#16188)

39 files changed, 180 insertions, 161 deletions

diff --git a/changelog.d/16188.misc b/changelog.d/16188.misc
new file mode 100644
index 0000000000..93ceaeafc9
--- /dev/null
+++ b/changelog.d/16188.misc
@@ -0,0 +1 @@
+Improve type hints.
diff --git a/poetry.lock b/poetry.lock
index 1d37c88328..6d63d71b2c 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1445,43 +1445,43 @@ files = [
 
 [[package]]
 name = "mypy"
-version = "1.0.1"
+version = "1.4.1"
 description = "Optional static typing for Python"
 optional = false
 python-versions = ">=3.7"
 files = [
-    {file = "mypy-1.0.1-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:71a808334d3f41ef011faa5a5cd8153606df5fc0b56de5b2e89566c8093a0c9a"},
-    {file = "mypy-1.0.1-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:920169f0184215eef19294fa86ea49ffd4635dedfdea2b57e45cb4ee85d5ccaf"},
-    {file = "mypy-1.0.1-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:27a0f74a298769d9fdc8498fcb4f2beb86f0564bcdb1a37b58cbbe78e55cf8c0"},
-    {file = "mypy-1.0.1-cp310-cp310-musllinux_1_1_x86_64.whl", hash = "sha256:65b122a993d9c81ea0bfde7689b3365318a88bde952e4dfa1b3a8b4ac05d168b"},
-    {file = "mypy-1.0.1-cp310-cp310-win_amd64.whl", hash = "sha256:5deb252fd42a77add936b463033a59b8e48eb2eaec2976d76b6878d031933fe4"},
-    {file = "mypy-1.0.1-cp311-cp311-macosx_10_9_x86_64.whl", hash = "sha256:2013226d17f20468f34feddd6aae4635a55f79626549099354ce641bc7d40262"},
-    {file = "mypy-1.0.1-cp311-cp311-macosx_11_0_arm64.whl", hash = "sha256:48525aec92b47baed9b3380371ab8ab6e63a5aab317347dfe9e55e02aaad22e8"},
-    {file = "mypy-1.0.1-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:c96b8a0c019fe29040d520d9257d8c8f122a7343a8307bf8d6d4a43f5c5bfcc8"},
-    {file = "mypy-1.0.1-cp311-cp311-musllinux_1_1_x86_64.whl", hash = "sha256:448de661536d270ce04f2d7dddaa49b2fdba6e3bd8a83212164d4174ff43aa65"},
-    {file = "mypy-1.0.1-cp311-cp311-win_amd64.whl", hash = "sha256:d42a98e76070a365a1d1c220fcac8aa4ada12ae0db679cb4d910fabefc88b994"},
-    {file = "mypy-1.0.1-cp37-cp37m-macosx_10_9_x86_64.whl", hash = "sha256:e64f48c6176e243ad015e995de05af7f22bbe370dbb5b32bd6988438ec873919"},
-    {file = "mypy-1.0.1-cp37-cp37m-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:5fdd63e4f50e3538617887e9aee91855368d9fc1dea30da743837b0df7373bc4"},
-    {file = "mypy-1.0.1-cp37-cp37m-musllinux_1_1_x86_64.whl", hash = "sha256:dbeb24514c4acbc78d205f85dd0e800f34062efcc1f4a4857c57e4b4b8712bff"},
-    {file = "mypy-1.0.1-cp37-cp37m-win_amd64.whl", hash = "sha256:a2948c40a7dd46c1c33765718936669dc1f628f134013b02ff5ac6c7ef6942bf"},
-    {file = "mypy-1.0.1-cp38-cp38-macosx_10_9_x86_64.whl", hash = "sha256:5bc8d6bd3b274dd3846597855d96d38d947aedba18776aa998a8d46fabdaed76"},
-    {file = "mypy-1.0.1-cp38-cp38-macosx_11_0_arm64.whl", hash = "sha256:17455cda53eeee0a4adb6371a21dd3dbf465897de82843751cf822605d152c8c"},
-    {file = "mypy-1.0.1-cp38-cp38-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:e831662208055b006eef68392a768ff83596035ffd6d846786578ba1714ba8f6"},
-    {file = "mypy-1.0.1-cp38-cp38-musllinux_1_1_x86_64.whl", hash = "sha256:e60d0b09f62ae97a94605c3f73fd952395286cf3e3b9e7b97f60b01ddfbbda88"},
-    {file = "mypy-1.0.1-cp38-cp38-win_amd64.whl", hash = "sha256:0af4f0e20706aadf4e6f8f8dc5ab739089146b83fd53cb4a7e0e850ef3de0bb6"},
-    {file = "mypy-1.0.1-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:24189f23dc66f83b839bd1cce2dfc356020dfc9a8bae03978477b15be61b062e"},
-    {file = "mypy-1.0.1-cp39-cp39-macosx_11_0_arm64.whl", hash = "sha256:93a85495fb13dc484251b4c1fd7a5ac370cd0d812bbfc3b39c1bafefe95275d5"},
-    {file = "mypy-1.0.1-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:5f546ac34093c6ce33f6278f7c88f0f147a4849386d3bf3ae193702f4fe31407"},
-    {file = "mypy-1.0.1-cp39-cp39-musllinux_1_1_x86_64.whl", hash = "sha256:c6c2ccb7af7154673c591189c3687b013122c5a891bb5651eca3db8e6c6c55bd"},
-    {file = "mypy-1.0.1-cp39-cp39-win_amd64.whl", hash = "sha256:15b5a824b58c7c822c51bc66308e759243c32631896743f030daf449fe3677f3"},
-    {file = "mypy-1.0.1-py3-none-any.whl", hash = "sha256:eda5c8b9949ed411ff752b9a01adda31afe7eae1e53e946dbdf9db23865e66c4"},
-    {file = "mypy-1.0.1.tar.gz", hash = "sha256:28cea5a6392bb43d266782983b5a4216c25544cd7d80be681a155ddcdafd152d"},
-]
-
-[package.dependencies]
-mypy-extensions = ">=0.4.3"
+    {file = "mypy-1.4.1-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:566e72b0cd6598503e48ea610e0052d1b8168e60a46e0bfd34b3acf2d57f96a8"},
+    {file = "mypy-1.4.1-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:ca637024ca67ab24a7fd6f65d280572c3794665eaf5edcc7e90a866544076878"},
+    {file = "mypy-1.4.1-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:0dde1d180cd84f0624c5dcaaa89c89775550a675aff96b5848de78fb11adabcd"},
+    {file = "mypy-1.4.1-cp310-cp310-musllinux_1_1_x86_64.whl", hash = "sha256:8c4d8e89aa7de683e2056a581ce63c46a0c41e31bd2b6d34144e2c80f5ea53dc"},
+    {file = "mypy-1.4.1-cp310-cp310-win_amd64.whl", hash = "sha256:bfdca17c36ae01a21274a3c387a63aa1aafe72bff976522886869ef131b937f1"},
+    {file = "mypy-1.4.1-cp311-cp311-macosx_10_9_x86_64.whl", hash = "sha256:7549fbf655e5825d787bbc9ecf6028731973f78088fbca3a1f4145c39ef09462"},
+    {file = "mypy-1.4.1-cp311-cp311-macosx_11_0_arm64.whl", hash = "sha256:98324ec3ecf12296e6422939e54763faedbfcc502ea4a4c38502082711867258"},
+    {file = "mypy-1.4.1-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:141dedfdbfe8a04142881ff30ce6e6653c9685b354876b12e4fe6c78598b45e2"},
+    {file = "mypy-1.4.1-cp311-cp311-musllinux_1_1_x86_64.whl", hash = "sha256:8207b7105829eca6f3d774f64a904190bb2231de91b8b186d21ffd98005f14a7"},
+    {file = "mypy-1.4.1-cp311-cp311-win_amd64.whl", hash = "sha256:16f0db5b641ba159eff72cff08edc3875f2b62b2fa2bc24f68c1e7a4e8232d01"},
+    {file = "mypy-1.4.1-cp37-cp37m-macosx_10_9_x86_64.whl", hash = "sha256:470c969bb3f9a9efcedbadcd19a74ffb34a25f8e6b0e02dae7c0e71f8372f97b"},
+    {file = "mypy-1.4.1-cp37-cp37m-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:e5952d2d18b79f7dc25e62e014fe5a23eb1a3d2bc66318df8988a01b1a037c5b"},
+    {file = "mypy-1.4.1-cp37-cp37m-musllinux_1_1_x86_64.whl", hash = "sha256:190b6bab0302cec4e9e6767d3eb66085aef2a1cc98fe04936d8a42ed2ba77bb7"},
+    {file = "mypy-1.4.1-cp37-cp37m-win_amd64.whl", hash = "sha256:9d40652cc4fe33871ad3338581dca3297ff5f2213d0df345bcfbde5162abf0c9"},
+    {file = "mypy-1.4.1-cp38-cp38-macosx_10_9_x86_64.whl", hash = "sha256:01fd2e9f85622d981fd9063bfaef1aed6e336eaacca00892cd2d82801ab7c042"},
+    {file = "mypy-1.4.1-cp38-cp38-macosx_11_0_arm64.whl", hash = "sha256:2460a58faeea905aeb1b9b36f5065f2dc9a9c6e4c992a6499a2360c6c74ceca3"},
+    {file = "mypy-1.4.1-cp38-cp38-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:a2746d69a8196698146a3dbe29104f9eb6a2a4d8a27878d92169a6c0b74435b6"},
+    {file = "mypy-1.4.1-cp38-cp38-musllinux_1_1_x86_64.whl", hash = "sha256:ae704dcfaa180ff7c4cfbad23e74321a2b774f92ca77fd94ce1049175a21c97f"},
+    {file = "mypy-1.4.1-cp38-cp38-win_amd64.whl", hash = "sha256:43d24f6437925ce50139a310a64b2ab048cb2d3694c84c71c3f2a1626d8101dc"},
+    {file = "mypy-1.4.1-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:c482e1246726616088532b5e964e39765b6d1520791348e6c9dc3af25b233828"},
+    {file = "mypy-1.4.1-cp39-cp39-macosx_11_0_arm64.whl", hash = "sha256:43b592511672017f5b1a483527fd2684347fdffc041c9ef53428c8dc530f79a3"},
+    {file = "mypy-1.4.1-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:34a9239d5b3502c17f07fd7c0b2ae6b7dd7d7f6af35fbb5072c6208e76295816"},
+    {file = "mypy-1.4.1-cp39-cp39-musllinux_1_1_x86_64.whl", hash = "sha256:5703097c4936bbb9e9bce41478c8d08edd2865e177dc4c52be759f81ee4dd26c"},
+    {file = "mypy-1.4.1-cp39-cp39-win_amd64.whl", hash = "sha256:e02d700ec8d9b1859790c0475df4e4092c7bf3272a4fd2c9f33d87fac4427b8f"},
+    {file = "mypy-1.4.1-py3-none-any.whl", hash = "sha256:45d32cec14e7b97af848bddd97d85ea4f0db4d5a149ed9676caa4eb2f7402bb4"},
+    {file = "mypy-1.4.1.tar.gz", hash = "sha256:9bbcd9ab8ea1f2e1c8031c21445b511442cc45c89951e49bbf852cbb70755b1b"},
+]
+
+[package.dependencies]
+mypy-extensions = ">=1.0.0"
 tomli = {version = ">=1.1.0", markers = "python_version < \"3.11\""}
-typing-extensions = ">=3.10"
+typing-extensions = ">=4.1.0"
 
 [package.extras]
 dmypy = ["psutil (>=4.0)"]
@@ -1502,17 +1502,17 @@ files = [
 
 [[package]]
 name = "mypy-zope"
-version = "0.9.1"
+version = "1.0.0"
 description = "Plugin for mypy to support zope interfaces"
 optional = false
 python-versions = "*"
 files = [
-    {file = "mypy-zope-0.9.1.tar.gz", hash = "sha256:4c87dbc71fec35f6533746ecdf9d400cd9281338d71c16b5676bb5ed00a97ca2"},
-    {file = "mypy_zope-0.9.1-py3-none-any.whl", hash = "sha256:733d4399affe9e61e332ce9c4049418d6775c39b473e4b9f409d51c207c1b71a"},
+    {file = "mypy-zope-1.0.0.tar.gz", hash = "sha256:be815c2fcb5333aa87e8ec682029ad3214142fe2a05ea383f9ff2d77c98008b7"},
+    {file = "mypy_zope-1.0.0-py3-none-any.whl", hash = "sha256:9732e9b2198f2aec3343b38a51905ff49d44dc9e39e8e8bc6fc490b232388209"},
 ]
 
 [package.dependencies]
-mypy = ">=1.0.0,<1.1.0"
+mypy = ">=1.0.0,<1.5.0"
 "zope.interface" = "*"
 "zope.schema" = "*"
 
diff --git a/synapse/_scripts/synapse_port_db.py b/synapse/_scripts/synapse_port_db.py
index 49242800b8..ab2b29cf1b 100755
--- a/synapse/_scripts/synapse_port_db.py
+++ b/synapse/_scripts/synapse_port_db.py
@@ -482,7 +482,10 @@ class Porter:
                         do_backward[0] = False
 
                 if forward_rows or backward_rows:
-                    headers = [column[0] for column in txn.description]
+                    assert txn.description is not None
+                    headers: Optional[List[str]] = [
+                        column[0] for column in txn.description
+                    ]
                 else:
                     headers = None
 
@@ -544,6 +547,7 @@ class Porter:
             def r(txn: LoggingTransaction) -> Tuple[List[str], List[Tuple]]:
                 txn.execute(select, (forward_chunk, self.batch_size))
                 rows = txn.fetchall()
+                assert txn.description is not None
                 headers = [column[0] for column in txn.description]
 
                 return headers, rows
@@ -919,7 +923,8 @@ class Porter:
         def r(txn: LoggingTransaction) -> Tuple[List[str], List[Tuple]]:
             txn.execute(select)
             rows = txn.fetchall()
-            headers: List[str] = [column[0] for column in txn.description]
+            assert txn.description is not None
+            headers = [column[0] for column in txn.description]
 
             ts_ind = headers.index("ts")
 
diff --git a/synapse/logging/opentracing.py b/synapse/logging/opentracing.py
index be910128aa..5c3045e197 100644
--- a/synapse/logging/opentracing.py
+++ b/synapse/logging/opentracing.py
@@ -910,10 +910,10 @@ def _custom_sync_async_decorator(
         async def _wrapper(
             *args: P.args, **kwargs: P.kwargs
         ) -> Any:  # Return type is RInner
-            with wrapping_logic(func, *args, **kwargs):
-                # type-ignore: func() returns R, but mypy doesn't know that R is
-                # Awaitable here.
-                return await func(*args, **kwargs)  # type: ignore[misc]
+            # type-ignore: func() returns R, but mypy doesn't know that R is
+            # Awaitable here.
+            with wrapping_logic(func, *args, **kwargs):  # type: ignore[arg-type]
+                return await func(*args, **kwargs)
 
     else:
         # The other case here handles sync functions including those decorated with
@@ -980,8 +980,7 @@ def trace_with_opname(
     See the module's doc string for usage examples.
     """
 
-    # type-ignore: mypy bug, see https://github.com/python/mypy/issues/12909
-    @contextlib.contextmanager  # type: ignore[arg-type]
+    @contextlib.contextmanager
     def _wrapping_logic(
         func: Callable[P, R], *args: P.args, **kwargs: P.kwargs
     ) -> Generator[None, None, None]:
@@ -1024,8 +1023,7 @@ def tag_args(func: Callable[P, R]) -> Callable[P, R]:
     if not opentracing:
         return func
 
-    # type-ignore: mypy bug, see https://github.com/python/mypy/issues/12909
-    @contextlib.contextmanager  # type: ignore[arg-type]
+    @contextlib.contextmanager
     def _wrapping_logic(
         func: Callable[P, R], *args: P.args, **kwargs: P.kwargs
     ) -> Generator[None, None, None]:
diff --git a/synapse/storage/database.py b/synapse/storage/database.py
index a1c8fb0f46..55ac313f33 100644
--- a/synapse/storage/database.py
+++ b/synapse/storage/database.py
@@ -31,6 +31,7 @@ from typing import (
     Iterator,
     List,
     Optional,
+    Sequence,
     Tuple,
     Type,
     TypeVar,
@@ -358,7 +359,21 @@ class LoggingTransaction:
         return self.txn.rowcount
 
     @property
-    def description(self) -> Any:
+    def description(
+        self,
+    ) -> Optional[
+        Sequence[
+            Tuple[
+                str,
+                Optional[Any],
+                Optional[int],
+                Optional[int],
+                Optional[int],
+                Optional[int],
+                Optional[int],
+            ]
+        ]
+    ]:
         return self.txn.description
 
     def execute_batch(self, sql: str, args: Iterable[Iterable[Any]]) -> None:
diff --git a/synapse/util/check_dependencies.py b/synapse/util/check_dependencies.py
index 114130a08f..f7cead9e12 100644
--- a/synapse/util/check_dependencies.py
+++ b/synapse/util/check_dependencies.py
@@ -51,9 +51,9 @@ class DependencyException(Exception):
 
 
 DEV_EXTRAS = {"lint", "mypy", "test", "dev"}
-RUNTIME_EXTRAS = (
-    set(metadata.metadata(DISTRIBUTION_NAME).get_all("Provides-Extra")) - DEV_EXTRAS
-)
+ALL_EXTRAS = metadata.metadata(DISTRIBUTION_NAME).get_all("Provides-Extra")
+assert ALL_EXTRAS is not None
+RUNTIME_EXTRAS = set(ALL_EXTRAS) - DEV_EXTRAS
 VERSION = metadata.version(DISTRIBUTION_NAME)
 
 
diff --git a/tests/appservice/test_api.py b/tests/appservice/test_api.py
index 3c635e3dcb..75fb5fae6b 100644
--- a/tests/appservice/test_api.py
+++ b/tests/appservice/test_api.py
@@ -96,7 +96,7 @@ class ApplicationServiceApiTestCase(unittest.HomeserverTestCase):
                 )
 
         # We assign to a method, which mypy doesn't like.
-        self.api.get_json = Mock(side_effect=get_json)  # type: ignore[assignment]
+        self.api.get_json = Mock(side_effect=get_json)  # type: ignore[method-assign]
 
         result = self.get_success(
             self.api.query_3pe(self.service, "user", PROTOCOL, {b"some": [b"field"]})
@@ -168,7 +168,7 @@ class ApplicationServiceApiTestCase(unittest.HomeserverTestCase):
                 )
 
         # We assign to a method, which mypy doesn't like.
-        self.api.get_json = Mock(side_effect=get_json)  # type: ignore[assignment]
+        self.api.get_json = Mock(side_effect=get_json)  # type: ignore[method-assign]
 
         result = self.get_success(
             self.api.query_3pe(self.service, "user", PROTOCOL, {b"some": [b"field"]})
@@ -215,7 +215,7 @@ class ApplicationServiceApiTestCase(unittest.HomeserverTestCase):
             return RESPONSE
 
         # We assign to a method, which mypy doesn't like.
-        self.api.post_json_get_json = Mock(side_effect=post_json_get_json)  # type: ignore[assignment]
+        self.api.post_json_get_json = Mock(side_effect=post_json_get_json)  # type: ignore[method-assign]
 
         MISSING_KEYS = [
             # Known user, known device, missing algorithm.
diff --git a/tests/federation/test_complexity.py b/tests/federation/test_complexity.py
index 5b58fb13b5..73a2766baf 100644
--- a/tests/federation/test_complexity.py
+++ b/tests/federation/test_complexity.py
@@ -57,7 +57,7 @@ class RoomComplexityTests(unittest.FederatingHomeserverTestCase):
         async def get_current_state_event_counts(room_id: str) -> int:
             return int(500 * 1.23)
 
-        store.get_current_state_event_counts = get_current_state_event_counts  # type: ignore[assignment]
+        store.get_current_state_event_counts = get_current_state_event_counts  # type: ignore[method-assign]
 
         # Get the room complexity again -- make sure it's our artificial value
         channel = self.make_signed_federation_request(
@@ -74,8 +74,8 @@ class RoomComplexityTests(unittest.FederatingHomeserverTestCase):
         fed_transport = self.hs.get_federation_transport_client()
 
         # Mock out some things, because we don't want to test the whole join
-        fed_transport.client.get_json = AsyncMock(return_value={"v1": 9999})  # type: ignore[assignment]
-        handler.federation_handler.do_invite_join = AsyncMock(  # type: ignore[assignment]
+        fed_transport.client.get_json = AsyncMock(return_value={"v1": 9999})  # type: ignore[method-assign]
+        handler.federation_handler.do_invite_join = AsyncMock(  # type: ignore[method-assign]
             return_value=("", 1)
         )
 
@@ -105,8 +105,8 @@ class RoomComplexityTests(unittest.FederatingHomeserverTestCase):
         fed_transport = self.hs.get_federation_transport_client()
 
         # Mock out some things, because we don't want to test the whole join
-        fed_transport.client.get_json = AsyncMock(return_value={"v1": 9999})  # type: ignore[assignment]
-        handler.federation_handler.do_invite_join = AsyncMock(  # type: ignore[assignment]
+        fed_transport.client.get_json = AsyncMock(return_value={"v1": 9999})  # type: ignore[method-assign]
+        handler.federation_handler.do_invite_join = AsyncMock(  # type: ignore[method-assign]
             return_value=("", 1)
         )
 
@@ -142,8 +142,8 @@ class RoomComplexityTests(unittest.FederatingHomeserverTestCase):
         fed_transport = self.hs.get_federation_transport_client()
 
         # Mock out some things, because we don't want to test the whole join
-        fed_transport.client.get_json = AsyncMock(return_value=None)  # type: ignore[assignment]
-        handler.federation_handler.do_invite_join = AsyncMock(  # type: ignore[assignment]
+        fed_transport.client.get_json = AsyncMock(return_value=None)  # type: ignore[method-assign]
+        handler.federation_handler.do_invite_join = AsyncMock(  # type: ignore[method-assign]
             return_value=("", 1)
         )
 
@@ -151,7 +151,7 @@ class RoomComplexityTests(unittest.FederatingHomeserverTestCase):
         async def get_current_state_event_counts(room_id: str) -> int:
             return 600
 
-        self.hs.get_datastores().main.get_current_state_event_counts = get_current_state_event_counts  # type: ignore[assignment]
+        self.hs.get_datastores().main.get_current_state_event_counts = get_current_state_event_counts  # type: ignore[method-assign]
 
         d = handler._remote_join(
             create_requester(u1),
@@ -199,8 +199,8 @@ class RoomComplexityAdminTests(unittest.FederatingHomeserverTestCase):
         fed_transport = self.hs.get_federation_transport_client()
 
         # Mock out some things, because we don't want to test the whole join
-        fed_transport.client.get_json = AsyncMock(return_value={"v1": 9999})  # type: ignore[assignment]
-        handler.federation_handler.do_invite_join = AsyncMock(  # type: ignore[assignment]
+        fed_transport.client.get_json = AsyncMock(return_value={"v1": 9999})  # type: ignore[method-assign]
+        handler.federation_handler.do_invite_join = AsyncMock(  # type: ignore[method-assign]
             return_value=("", 1)
         )
 
@@ -229,8 +229,8 @@ class RoomComplexityAdminTests(unittest.FederatingHomeserverTestCase):
         fed_transport = self.hs.get_federation_transport_client()
 
         # Mock out some things, because we don't want to test the whole join
-        fed_transport.client.get_json = AsyncMock(return_value={"v1": 9999})  # type: ignore[assignment]
-        handler.federation_handler.do_invite_join = AsyncMock(  # type: ignore[assignment]
+        fed_transport.client.get_json = AsyncMock(return_value={"v1": 9999})  # type: ignore[method-assign]
+        handler.federation_handler.do_invite_join = AsyncMock(  # type: ignore[method-assign]
             return_value=("", 1)
         )
 
diff --git a/tests/federation/test_federation_catch_up.py b/tests/federation/test_federation_catch_up.py
index 40318aa1b6..75ae740b43 100644
--- a/tests/federation/test_federation_catch_up.py
+++ b/tests/federation/test_federation_catch_up.py
@@ -50,7 +50,7 @@ class FederationCatchUpTestCases(FederatingHomeserverTestCase):
         # This mock is crucial for destination_rooms to be populated.
         # TODO: this seems to no longer be the case---tests pass with this mock
         # commented out.
-        state_storage_controller.get_current_hosts_in_room = AsyncMock(  # type: ignore[assignment]
+        state_storage_controller.get_current_hosts_in_room = AsyncMock(  # type: ignore[method-assign]
             return_value={"test", "host2"}
         )
 
@@ -436,7 +436,7 @@ class FederationCatchUpTestCases(FederatingHomeserverTestCase):
         def wake_destination_track(destination: str) -> None:
             woken.add(destination)
 
-        self.federation_sender.wake_destination = wake_destination_track  # type: ignore[assignment]
+        self.federation_sender.wake_destination = wake_destination_track  # type: ignore[method-assign]
 
         # We wait quite long so that all dests can be woken up, since there is a delay
         # between them.
diff --git a/tests/federation/test_federation_sender.py b/tests/federation/test_federation_sender.py
index 5ea4a75a9f..7bd3d06859 100644
--- a/tests/federation/test_federation_sender.py
+++ b/tests/federation/test_federation_sender.py
@@ -47,11 +47,11 @@ class FederationSenderReceiptsTestCases(HomeserverTestCase):
             federation_transport_client=self.federation_transport_client,
         )
 
-        hs.get_storage_controllers().state.get_current_hosts_in_room = AsyncMock(  # type: ignore[assignment]
+        hs.get_storage_controllers().state.get_current_hosts_in_room = AsyncMock(  # type: ignore[method-assign]
             return_value={"test", "host2"}
         )
 
-        hs.get_storage_controllers().state.get_current_hosts_in_room_or_partial_state_approximation = (  # type: ignore[assignment]
+        hs.get_storage_controllers().state.get_current_hosts_in_room_or_partial_state_approximation = (  # type: ignore[method-assign]
             hs.get_storage_controllers().state.get_current_hosts_in_room
         )
 
diff --git a/tests/federation/transport/test_knocking.py b/tests/federation/transport/test_knocking.py
index 70209ab090..3f42f79f26 100644
--- a/tests/federation/transport/test_knocking.py
+++ b/tests/federation/transport/test_knocking.py
@@ -218,7 +218,7 @@ class FederationKnockingTestCase(
         ) -> EventBase:
             return pdu
 
-        homeserver.get_federation_server()._check_sigs_and_hash = (  # type: ignore[assignment]
+        homeserver.get_federation_server()._check_sigs_and_hash = (  # type: ignore[method-assign]
             approve_all_signature_checking
         )
 
@@ -229,7 +229,7 @@ class FederationKnockingTestCase(
         ) -> None:
             pass
 
-        homeserver.get_federation_event_handler()._check_event_auth = _check_event_auth  # type: ignore[assignment]
+        homeserver.get_federation_event_handler()._check_event_auth = _check_event_auth  # type: ignore[method-assign]
 
         return super().prepare(reactor, clock, homeserver)
 
diff --git a/tests/handlers/test_appservice.py b/tests/handlers/test_appservice.py
index 4bd0facd65..46d022092e 100644
--- a/tests/handlers/test_appservice.py
+++ b/tests/handlers/test_appservice.py
@@ -400,11 +400,11 @@ class ApplicationServicesHandlerSendEventsTestCase(unittest.HomeserverTestCase):
         # Mock the ApplicationServiceScheduler's _TransactionController's send method so that
         # we can track any outgoing ephemeral events
         self.send_mock = AsyncMock()
-        hs.get_application_service_handler().scheduler.txn_ctrl.send = self.send_mock  # type: ignore[assignment]
+        hs.get_application_service_handler().scheduler.txn_ctrl.send = self.send_mock  # type: ignore[method-assign]
 
         # Mock out application services, and allow defining our own in tests
         self._services: List[ApplicationService] = []
-        self.hs.get_datastores().main.get_app_services = Mock(  # type: ignore[assignment]
+        self.hs.get_datastores().main.get_app_services = Mock(  # type: ignore[method-assign]
             return_value=self._services
         )
 
@@ -898,11 +898,11 @@ class ApplicationServicesHandlerDeviceListsTestCase(unittest.HomeserverTestCase)
         # Mock ApplicationServiceApi's put_json, so we can verify the raw JSON that
         # will be sent over the wire
         self.put_json = AsyncMock()
-        hs.get_application_service_api().put_json = self.put_json  # type: ignore[assignment]
+        hs.get_application_service_api().put_json = self.put_json  # type: ignore[method-assign]
 
         # Mock out application services, and allow defining our own in tests
         self._services: List[ApplicationService] = []
-        self.hs.get_datastores().main.get_app_services = Mock(  # type: ignore[assignment]
+        self.hs.get_datastores().main.get_app_services = Mock(  # type: ignore[method-assign]
             return_value=self._services
         )
 
@@ -1004,7 +1004,7 @@ class ApplicationServicesHandlerOtkCountsTestCase(unittest.HomeserverTestCase):
         # Mock the ApplicationServiceScheduler's _TransactionController's send method so that
         # we can track what's going out
         self.send_mock = AsyncMock()
-        hs.get_application_service_handler().scheduler.txn_ctrl.send = self.send_mock  # type: ignore[assignment]  # We assign to a method.
+        hs.get_application_service_handler().scheduler.txn_ctrl.send = self.send_mock  # type: ignore[method-assign]  # We assign to a method.
 
         # Define an application service for the tests
         self._service_token = "VERYSECRET"
diff --git a/tests/handlers/test_cas.py b/tests/handlers/test_cas.py
index 2cb24add20..8582b1cd1e 100644
--- a/tests/handlers/test_cas.py
+++ b/tests/handlers/test_cas.py
@@ -60,7 +60,7 @@ class CasHandlerTestCase(HomeserverTestCase):
 
         # stub out the auth handler
         auth_handler = self.hs.get_auth_handler()
-        auth_handler.complete_sso_login = AsyncMock()  # type: ignore[assignment]
+        auth_handler.complete_sso_login = AsyncMock()  # type: ignore[method-assign]
 
         cas_response = CasResponse("test_user", {})
         request = _mock_request()
@@ -88,7 +88,7 @@ class CasHandlerTestCase(HomeserverTestCase):
 
         # stub out the auth handler
         auth_handler = self.hs.get_auth_handler()
-        auth_handler.complete_sso_login = AsyncMock()  # type: ignore[assignment]
+        auth_handler.complete_sso_login = AsyncMock()  # type: ignore[method-assign]
 
         # Map a user via SSO.
         cas_response = CasResponse("test_user", {})
@@ -128,7 +128,7 @@ class CasHandlerTestCase(HomeserverTestCase):
 
         # stub out the auth handler
         auth_handler = self.hs.get_auth_handler()
-        auth_handler.complete_sso_login = AsyncMock()  # type: ignore[assignment]
+        auth_handler.complete_sso_login = AsyncMock()  # type: ignore[method-assign]
 
         cas_response = CasResponse("föö", {})
         request = _mock_request()
@@ -159,7 +159,7 @@ class CasHandlerTestCase(HomeserverTestCase):
 
         # stub out the auth handler
         auth_handler = self.hs.get_auth_handler()
-        auth_handler.complete_sso_login = AsyncMock()  # type: ignore[assignment]
+        auth_handler.complete_sso_login = AsyncMock()  # type: ignore[method-assign]
 
         # The response doesn't have the proper userGroup or department.
         cas_response = CasResponse("test_user", {})
diff --git a/tests/handlers/test_e2e_keys.py b/tests/handlers/test_e2e_keys.py
index 7917766a08..c5556f2844 100644
--- a/tests/handlers/test_e2e_keys.py
+++ b/tests/handlers/test_e2e_keys.py
@@ -800,7 +800,7 @@ class E2eKeysHandlerTestCase(unittest.HomeserverTestCase):
         remote_master_key = "85T7JXPFBAySB/jwby4S3lBPTqY3+Zg53nYuGmu1ggY"
         remote_self_signing_key = "QeIiFEjluPBtI7WQdG365QKZcFs9kqmHir6RBD0//nQ"
 
-        self.hs.get_federation_client().query_client_keys = mock.AsyncMock(  # type: ignore[assignment]
+        self.hs.get_federation_client().query_client_keys = mock.AsyncMock(  # type: ignore[method-assign]
             return_value={
                 "device_keys": {remote_user_id: {}},
                 "master_keys": {
@@ -876,7 +876,7 @@ class E2eKeysHandlerTestCase(unittest.HomeserverTestCase):
         remote_master_key = "85T7JXPFBAySB/jwby4S3lBPTqY3+Zg53nYuGmu1ggY"
         remote_self_signing_key = "QeIiFEjluPBtI7WQdG365QKZcFs9kqmHir6RBD0//nQ"
 
-        self.hs.get_federation_client().query_user_devices = mock.AsyncMock(  # type: ignore[assignment]
+        self.hs.get_federation_client().query_user_devices = mock.AsyncMock(  # type: ignore[method-assign]
             return_value={
                 "user_id": remote_user_id,
                 "stream_id": 1,
diff --git a/tests/handlers/test_federation.py b/tests/handlers/test_federation.py
index bd743b3578..21d63ab1f2 100644
--- a/tests/handlers/test_federation.py
+++ b/tests/handlers/test_federation.py
@@ -371,14 +371,14 @@ class FederationTestCase(unittest.FederatingHomeserverTestCase):
         # We mock out the FederationClient.backfill method, to pretend that a remote
         # server has returned our fake event.
         federation_client_backfill_mock = AsyncMock(return_value=[event])
-        self.hs.get_federation_client().backfill = federation_client_backfill_mock  # type: ignore[assignment]
+        self.hs.get_federation_client().backfill = federation_client_backfill_mock  # type: ignore[method-assign]
 
         # We also mock the persist method with a side effect of itself. This allows us
         # to track when it has been called while preserving its function.
         persist_events_and_notify_mock = Mock(
             side_effect=self.hs.get_federation_event_handler().persist_events_and_notify
         )
-        self.hs.get_federation_event_handler().persist_events_and_notify = (  # type: ignore[assignment]
+        self.hs.get_federation_event_handler().persist_events_and_notify = (  # type: ignore[method-assign]
             persist_events_and_notify_mock
         )
 
diff --git a/tests/handlers/test_oidc.py b/tests/handlers/test_oidc.py
index 9b2c7812cc..e797aaae00 100644
--- a/tests/handlers/test_oidc.py
+++ b/tests/handlers/test_oidc.py
@@ -157,7 +157,7 @@ class OidcHandlerTestCase(HomeserverTestCase):
         sso_handler = hs.get_sso_handler()
         # Mock the render error method.
         self.render_error = Mock(return_value=None)
-        sso_handler.render_error = self.render_error  # type: ignore[assignment]
+        sso_handler.render_error = self.render_error  # type: ignore[method-assign]
 
         # Reduce the number of attempts when generating MXIDs.
         sso_handler._MAP_USERNAME_RETRIES = 3
@@ -165,7 +165,7 @@ class OidcHandlerTestCase(HomeserverTestCase):
         auth_handler = hs.get_auth_handler()
         # Mock the complete SSO login method.
         self.complete_sso_login = AsyncMock()
-        auth_handler.complete_sso_login = self.complete_sso_login  # type: ignore[assignment]
+        auth_handler.complete_sso_login = self.complete_sso_login  # type: ignore[method-assign]
 
         return hs
 
diff --git a/tests/handlers/test_password_providers.py b/tests/handlers/test_password_providers.py
index 4496370c3f..11ec8c7f11 100644
--- a/tests/handlers/test_password_providers.py
+++ b/tests/handlers/test_password_providers.py
@@ -830,7 +830,7 @@ class PasswordAuthProviderTests(unittest.HomeserverTestCase):
             username: The username to use for the test.
             registration: Whether to test with registration URLs.
         """
-        self.hs.get_identity_handler().send_threepid_validation = AsyncMock(  # type: ignore[assignment]
+        self.hs.get_identity_handler().send_threepid_validation = AsyncMock(  # type: ignore[method-assign]
             return_value=0
         )
 
diff --git a/tests/handlers/test_register.py b/tests/handlers/test_register.py
index a04234829f..e9fbf32c7c 100644
--- a/tests/handlers/test_register.py
+++ b/tests/handlers/test_register.py
@@ -202,7 +202,7 @@ class RegistrationTestCase(unittest.HomeserverTestCase):
 
     @override_config({"limit_usage_by_mau": True})
     def test_get_or_create_user_mau_not_blocked(self) -> None:
-        self.store.count_monthly_users = AsyncMock(  # type: ignore[assignment]
+        self.store.count_monthly_users = AsyncMock(  # type: ignore[method-assign]
             return_value=self.hs.config.server.max_mau_value - 1
         )
         # Ensure does not throw exception
@@ -299,7 +299,7 @@ class RegistrationTestCase(unittest.HomeserverTestCase):
     def test_auto_create_auto_join_rooms_when_user_is_the_first_real_user(self) -> None:
         room_alias_str = "#room:test"
 
-        self.store.count_real_users = AsyncMock(return_value=1)  # type: ignore[assignment]
+        self.store.count_real_users = AsyncMock(return_value=1)  # type: ignore[method-assign]
         self.store.is_real_user = AsyncMock(return_value=True)
         user_id = self.get_success(self.handler.register_user(localpart="real"))
         rooms = self.get_success(self.store.get_rooms_for_user(user_id))
@@ -314,7 +314,7 @@ class RegistrationTestCase(unittest.HomeserverTestCase):
     def test_auto_create_auto_join_rooms_when_user_is_not_the_first_real_user(
         self,
     ) -> None:
-        self.store.count_real_users = AsyncMock(return_value=2)  # type: ignore[assignment]
+        self.store.count_real_users = AsyncMock(return_value=2)  # type: ignore[method-assign]
         self.store.is_real_user = AsyncMock(return_value=True)
         user_id = self.get_success(self.handler.register_user(localpart="real"))
         rooms = self.get_success(self.store.get_rooms_for_user(user_id))
diff --git a/tests/handlers/test_saml.py b/tests/handlers/test_saml.py
index 6e666d7bed..00f4e181e8 100644
--- a/tests/handlers/test_saml.py
+++ b/tests/handlers/test_saml.py
@@ -133,7 +133,7 @@ class SamlHandlerTestCase(HomeserverTestCase):
 
         # stub out the auth handler
         auth_handler = self.hs.get_auth_handler()
-        auth_handler.complete_sso_login = AsyncMock()  # type: ignore[assignment]
+        auth_handler.complete_sso_login = AsyncMock()  # type: ignore[method-assign]
 
         # send a mocked-up SAML response to the callback
         saml_response = FakeAuthnResponse({"uid": "test_user", "username": "test_user"})
@@ -163,7 +163,7 @@ class SamlHandlerTestCase(HomeserverTestCase):
 
         # stub out the auth handler
         auth_handler = self.hs.get_auth_handler()
-        auth_handler.complete_sso_login = AsyncMock()  # type: ignore[assignment]
+        auth_handler.complete_sso_login = AsyncMock()  # type: ignore[method-assign]
 
         # Map a user via SSO.
         saml_response = FakeAuthnResponse(
@@ -205,11 +205,11 @@ class SamlHandlerTestCase(HomeserverTestCase):
 
         # stub out the auth handler
         auth_handler = self.hs.get_auth_handler()
-        auth_handler.complete_sso_login = AsyncMock()  # type: ignore[assignment]
+        auth_handler.complete_sso_login = AsyncMock()  # type: ignore[method-assign]
 
         # mock out the error renderer too
         sso_handler = self.hs.get_sso_handler()
-        sso_handler.render_error = Mock(return_value=None)  # type: ignore[assignment]
+        sso_handler.render_error = Mock(return_value=None)  # type: ignore[method-assign]
 
         saml_response = FakeAuthnResponse({"uid": "test", "username": "föö"})
         request = _mock_request()
@@ -226,9 +226,9 @@ class SamlHandlerTestCase(HomeserverTestCase):
 
         # stub out the auth handler and error renderer
         auth_handler = self.hs.get_auth_handler()
-        auth_handler.complete_sso_login = AsyncMock()  # type: ignore[assignment]
+        auth_handler.complete_sso_login = AsyncMock()  # type: ignore[method-assign]
         sso_handler = self.hs.get_sso_handler()
-        sso_handler.render_error = Mock(return_value=None)  # type: ignore[assignment]
+        sso_handler.render_error = Mock(return_value=None)  # type: ignore[method-assign]
 
         # register a user to occupy the first-choice MXID
         store = self.hs.get_datastores().main
@@ -311,7 +311,7 @@ class SamlHandlerTestCase(HomeserverTestCase):
 
         # stub out the auth handler
         auth_handler = self.hs.get_auth_handler()
-        auth_handler.complete_sso_login = AsyncMock()  # type: ignore[assignment]
+        auth_handler.complete_sso_login = AsyncMock()  # type: ignore[method-assign]
 
         # The response doesn't have the proper userGroup or department.
         saml_response = FakeAuthnResponse({"uid": "test_user", "username": "test_user"})
diff --git a/tests/handlers/test_typing.py b/tests/handlers/test_typing.py
index d776526bc1..2a295da3a0 100644
--- a/tests/handlers/test_typing.py
+++ b/tests/handlers/test_typing.py
@@ -122,15 +122,15 @@ class TypingNotificationsTestCase(unittest.HomeserverTestCase):
 
         self.datastore.get_destination_retry_timings = AsyncMock(return_value=None)
 
-        self.datastore.get_device_updates_by_remote = AsyncMock(  # type: ignore[assignment]
+        self.datastore.get_device_updates_by_remote = AsyncMock(  # type: ignore[method-assign]
             return_value=(0, [])
         )
 
-        self.datastore.get_destination_last_successful_stream_ordering = AsyncMock(  # type: ignore[assignment]
+        self.datastore.get_destination_last_successful_stream_ordering = AsyncMock(  # type: ignore[method-assign]
             return_value=None
         )
 
-        self.datastore.get_received_txn_response = AsyncMock(  # type: ignore[assignment]
+        self.datastore.get_received_txn_response = AsyncMock(  # type: ignore[method-assign]
             return_value=None
         )
 
@@ -143,25 +143,25 @@ class TypingNotificationsTestCase(unittest.HomeserverTestCase):
                 raise AuthError(401, "User is not in the room")
             return None
 
-        hs.get_auth().check_user_in_room = Mock(  # type: ignore[assignment]
+        hs.get_auth().check_user_in_room = Mock(  # type: ignore[method-assign]
             side_effect=check_user_in_room
         )
 
         async def check_host_in_room(room_id: str, server_name: str) -> bool:
             return room_id == ROOM_ID
 
-        hs.get_event_auth_handler().is_host_in_room = Mock(  # type: ignore[assignment]
+        hs.get_event_auth_handler().is_host_in_room = Mock(  # type: ignore[method-assign]
             side_effect=check_host_in_room
         )
 
         async def get_current_hosts_in_room(room_id: str) -> Set[str]:
             return {member.domain for member in self.room_members}
 
-        hs.get_storage_controllers().state.get_current_hosts_in_room = Mock(  # type: ignore[assignment]
+        hs.get_storage_controllers().state.get_current_hosts_in_room = Mock(  # type: ignore[method-assign]
             side_effect=get_current_hosts_in_room
         )
 
-        hs.get_storage_controllers().state.get_current_hosts_in_room_or_partial_state_approximation = Mock(  # type: ignore[assignment]
+        hs.get_storage_controllers().state.get_current_hosts_in_room_or_partial_state_approximation = Mock(  # type: ignore[method-assign]
             side_effect=get_current_hosts_in_room
         )
 
@@ -170,24 +170,24 @@ class TypingNotificationsTestCase(unittest.HomeserverTestCase):
 
         self.datastore.get_users_in_room = Mock(side_effect=get_users_in_room)
 
-        self.datastore.get_user_directory_stream_pos = AsyncMock(  # type: ignore[assignment]
+        self.datastore.get_user_directory_stream_pos = AsyncMock(  # type: ignore[method-assign]
             # we deliberately return a non-None stream pos to avoid
             # doing an initial_sync
             return_value=1
         )
 
-        self.datastore.get_partial_current_state_deltas = Mock(return_value=(0, None))  # type: ignore[assignment]
+        self.datastore.get_partial_current_state_deltas = Mock(return_value=(0, None))  # type: ignore[method-assign]
 
-        self.datastore.get_to_device_stream_token = Mock(  # type: ignore[assignment]
+        self.datastore.get_to_device_stream_token = Mock(  # type: ignore[method-assign]
             return_value=0
         )
-        self.datastore.get_new_device_msgs_for_remote = AsyncMock(  # type: ignore[assignment]
+        self.datastore.get_new_device_msgs_for_remote = AsyncMock(  # type: ignore[method-assign]
             return_value=([], 0)
         )
-        self.datastore.delete_device_msgs_for_remote = AsyncMock(  # type: ignore[assignment]
+        self.datastore.delete_device_msgs_for_remote = AsyncMock(  # type: ignore[method-assign]
             return_value=None
         )
-        self.datastore.set_received_txn_response = AsyncMock(  # type: ignore[assignment]
+        self.datastore.set_received_txn_response = AsyncMock(  # type: ignore[method-assign]
             return_value=None
         )
 
diff --git a/tests/logging/test_terse_json.py b/tests/logging/test_terse_json.py
index fa27f1279a..c379853e20 100644
--- a/tests/logging/test_terse_json.py
+++ b/tests/logging/test_terse_json.py
@@ -164,7 +164,7 @@ class TerseJsonTestCase(LoggerCleanupMixin, TestCase):
         # Call requestReceived to finish instantiating the object.
         request.content = BytesIO()
         # Partially skip some internal processing of SynapseRequest.
-        request._started_processing = Mock()  # type: ignore[assignment]
+        request._started_processing = Mock()  # type: ignore[method-assign]
         request.request_metrics = Mock(spec=["name"])
         with patch.object(Request, "render"):
             request.requestReceived(b"POST", b"/_matrix/client/versions", b"1.1")
diff --git a/tests/module_api/test_api.py b/tests/module_api/test_api.py
index 9ce9326190..172fc3a736 100644
--- a/tests/module_api/test_api.py
+++ b/tests/module_api/test_api.py
@@ -233,7 +233,7 @@ class ModuleApiTestCase(BaseModuleApiTestCase):
     def test_sending_events_into_room(self) -> None:
         """Tests that a module can send events into a room"""
         # Mock out create_and_send_nonmember_event to check whether events are being sent
-        self.event_creation_handler.create_and_send_nonmember_event = Mock(  # type: ignore[assignment]
+        self.event_creation_handler.create_and_send_nonmember_event = Mock(  # type: ignore[method-assign]
             spec=[],
             side_effect=self.event_creation_handler.create_and_send_nonmember_event,
         )
@@ -579,7 +579,7 @@ class ModuleApiTestCase(BaseModuleApiTestCase):
         # Necessary to fake a remote join.
         fake_stream_id = 1
         mocked_remote_join = AsyncMock(return_value=("fake-event-id", fake_stream_id))
-        self.hs.get_room_member_handler()._remote_join = mocked_remote_join  # type: ignore[assignment]
+        self.hs.get_room_member_handler()._remote_join = mocked_remote_join  # type: ignore[method-assign]
         fake_remote_host = f"{self.module_api.server_name}-remote"
 
         # Given that the join is to be faked, we expect the relevant join event not to
diff --git a/tests/push/test_bulk_push_rule_evaluator.py b/tests/push/test_bulk_push_rule_evaluator.py
index a3880ac171..7c23b77e0a 100644
--- a/tests/push/test_bulk_push_rule_evaluator.py
+++ b/tests/push/test_bulk_push_rule_evaluator.py
@@ -190,7 +190,7 @@ class TestBulkPushRuleEvaluator(HomeserverTestCase):
         # Mock the method which calculates push rules -- we do this instead of
         # e.g. checking the results in the database because we want to ensure
         # that code isn't even running.
-        bulk_evaluator._action_for_event_by_user = AsyncMock()  # type: ignore[assignment]
+        bulk_evaluator._action_for_event_by_user = AsyncMock()  # type: ignore[method-assign]
 
         # Ensure no actions are generated!
         self.get_success(bulk_evaluator.action_for_events_by_user([(event, context)]))
diff --git a/tests/replication/storage/test_events.py b/tests/replication/storage/test_events.py
index f7c6417a09..af25815fa5 100644
--- a/tests/replication/storage/test_events.py
+++ b/tests/replication/storage/test_events.py
@@ -58,7 +58,7 @@ def patch__eq__(cls: object) -> Callable[[], None]:
 
     def unpatch() -> None:
         if eq is not None:
-            cls.__eq__ = eq  # type: ignore[assignment]
+            cls.__eq__ = eq  # type: ignore[method-assign]
 
     return unpatch
 
diff --git a/tests/rest/admin/test_user.py b/tests/rest/admin/test_user.py
index 339a41c7e1..2f6bd0d74f 100644
--- a/tests/rest/admin/test_user.py
+++ b/tests/rest/admin/test_user.py
@@ -71,8 +71,8 @@ class UserRegisterTestCase(unittest.HomeserverTestCase):
 
         self.hs.config.registration.registration_shared_secret = "shared"
 
-        self.hs.get_media_repository = Mock()  # type: ignore[assignment]
-        self.hs.get_deactivate_account_handler = Mock()  # type: ignore[assignment]
+        self.hs.get_media_repository = Mock()  # type: ignore[method-assign]
+        self.hs.get_deactivate_account_handler = Mock()  # type: ignore[method-assign]
 
         return self.hs
 
diff --git a/tests/rest/admin/test_username_available.py b/tests/rest/admin/test_username_available.py
index 6c04e6c56c..4c69d224b8 100644
--- a/tests/rest/admin/test_username_available.py
+++ b/tests/rest/admin/test_username_available.py
@@ -50,7 +50,7 @@ class UsernameAvailableTestCase(unittest.HomeserverTestCase):
             )
 
         handler = self.hs.get_registration_handler()
-        handler.check_username = check_username  # type: ignore[assignment]
+        handler.check_username = check_username  # type: ignore[method-assign]
 
     def test_username_available(self) -> None:
         """
diff --git a/tests/rest/client/test_account.py b/tests/rest/client/test_account.py
index ac19f3c6da..e9f495e206 100644
--- a/tests/rest/client/test_account.py
+++ b/tests/rest/client/test_account.py
@@ -1346,7 +1346,7 @@ class AccountStatusTestCase(unittest.HomeserverTestCase):
                 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)  # type: ignore[assignment]
+        self.hs.get_federation_http_client().post_json = Mock(side_effect=post_json)  # type: ignore[method-assign]
 
         # Check that we've got the correct response from the client-side endpoint.
         self._test_status(
diff --git a/tests/rest/client/test_events.py b/tests/rest/client/test_events.py
index 54df2a252c..141e0f57a3 100644
--- a/tests/rest/client/test_events.py
+++ b/tests/rest/client/test_events.py
@@ -45,7 +45,7 @@ class EventStreamPermissionsTestCase(unittest.HomeserverTestCase):
 
         hs = self.setup_test_homeserver(config=config)
 
-        hs.get_federation_handler = Mock()  # type: ignore[assignment]
+        hs.get_federation_handler = Mock()  # type: ignore[method-assign]
 
         return hs
 
diff --git a/tests/rest/client/test_filter.py b/tests/rest/client/test_filter.py
index a2d5d340be..90a8df147c 100644
--- a/tests/rest/client/test_filter.py
+++ b/tests/rest/client/test_filter.py
@@ -65,14 +65,14 @@ class FilterTestCase(unittest.HomeserverTestCase):
 
     def test_add_filter_non_local_user(self) -> None:
         _is_mine = self.hs.is_mine
-        self.hs.is_mine = lambda target_user: False  # type: ignore[assignment]
+        self.hs.is_mine = lambda target_user: False  # type: ignore[method-assign]
         channel = self.make_request(
             "POST",
             "/_matrix/client/r0/user/%s/filter" % (self.user_id),
             self.EXAMPLE_FILTER_JSON,
         )
 
-        self.hs.is_mine = _is_mine  # type: ignore[assignment]
+        self.hs.is_mine = _is_mine  # type: ignore[method-assign]
         self.assertEqual(channel.code, 403)
         self.assertEqual(channel.json_body["errcode"], Codes.FORBIDDEN)
 
diff --git a/tests/rest/client/test_rooms.py b/tests/rest/client/test_rooms.py
index 53182459e4..47c1d38ad7 100644
--- a/tests/rest/client/test_rooms.py
+++ b/tests/rest/client/test_rooms.py
@@ -68,7 +68,7 @@ class RoomBase(unittest.HomeserverTestCase):
             "red",
         )
 
-        self.hs.get_federation_handler = Mock()  # type: ignore[assignment]
+        self.hs.get_federation_handler = Mock()  # type: ignore[method-assign]
         self.hs.get_federation_handler.return_value.maybe_backfill = AsyncMock(
             return_value=None
         )
@@ -76,7 +76,7 @@ class RoomBase(unittest.HomeserverTestCase):
         async def _insert_client_ip(*args: Any, **kwargs: Any) -> None:
             return None
 
-        self.hs.get_datastores().main.insert_client_ip = _insert_client_ip  # type: ignore[assignment]
+        self.hs.get_datastores().main.insert_client_ip = _insert_client_ip  # type: ignore[method-assign]
 
         return self.hs
 
@@ -3413,8 +3413,8 @@ class ThreepidInviteTestCase(unittest.HomeserverTestCase):
         # a remote IS. We keep the mock for make_and_store_3pid_invite around so we
         # can check its call_count later on during the test.
         make_invite_mock = AsyncMock(return_value=(Mock(event_id="abc"), 0))
-        self.hs.get_room_member_handler()._make_and_store_3pid_invite = make_invite_mock  # type: ignore[assignment]
-        self.hs.get_identity_handler().lookup_3pid = AsyncMock(  # type: ignore[assignment]
+        self.hs.get_room_member_handler()._make_and_store_3pid_invite = make_invite_mock  # type: ignore[method-assign]
+        self.hs.get_identity_handler().lookup_3pid = AsyncMock(  # type: ignore[method-assign]
             return_value=None,
         )
 
@@ -3477,8 +3477,8 @@ class ThreepidInviteTestCase(unittest.HomeserverTestCase):
         # a remote IS. We keep the mock for make_and_store_3pid_invite around so we
         # can check its call_count later on during the test.
         make_invite_mock = AsyncMock(return_value=(Mock(event_id="abc"), 0))
-        self.hs.get_room_member_handler()._make_and_store_3pid_invite = make_invite_mock  # type: ignore[assignment]
-        self.hs.get_identity_handler().lookup_3pid = AsyncMock(  # type: ignore[assignment]
+        self.hs.get_room_member_handler()._make_and_store_3pid_invite = make_invite_mock  # type: ignore[method-assign]
+        self.hs.get_identity_handler().lookup_3pid = AsyncMock(  # type: ignore[method-assign]
             return_value=None,
         )
 
diff --git a/tests/rest/client/test_shadow_banned.py b/tests/rest/client/test_shadow_banned.py
index 8d2cdf8751..9aecf88e41 100644
--- a/tests/rest/client/test_shadow_banned.py
+++ b/tests/rest/client/test_shadow_banned.py
@@ -84,7 +84,7 @@ class RoomTestCase(_ShadowBannedBase):
     def test_invite_3pid(self) -> None:
         """Ensure that a 3PID invite does not attempt to contact the identity server."""
         identity_handler = self.hs.get_identity_handler()
-        identity_handler.lookup_3pid = Mock(  # type: ignore[assignment]
+        identity_handler.lookup_3pid = Mock(  # type: ignore[method-assign]
             side_effect=AssertionError("This should not get called")
         )
 
diff --git a/tests/rest/client/test_third_party_rules.py b/tests/rest/client/test_third_party_rules.py
index da37fcb045..57eb713b15 100644
--- a/tests/rest/client/test_third_party_rules.py
+++ b/tests/rest/client/test_third_party_rules.py
@@ -117,7 +117,7 @@ class ThirdPartyRulesTestCase(unittest.FederatingHomeserverTestCase):
         async def _check_event_auth(origin: Any, event: Any, context: Any) -> None:
             pass
 
-        hs.get_federation_event_handler()._check_event_auth = _check_event_auth  # type: ignore[assignment]
+        hs.get_federation_event_handler()._check_event_auth = _check_event_auth  # type: ignore[method-assign]
 
         return hs
 
diff --git a/tests/server.py b/tests/server.py
index 659ccce838..08633fe640 100644
--- a/tests/server.py
+++ b/tests/server.py
@@ -722,7 +722,7 @@ def _make_test_homeserver_synchronous(server: HomeServer) -> None:
                 **kwargs,
             )
 
-        pool.runWithConnection = runWithConnection  # type: ignore[assignment]
+        pool.runWithConnection = runWithConnection  # type: ignore[method-assign]
         pool.runInteraction = runInteraction  # type: ignore[assignment]
         # Replace the thread pool with a threadless 'thread' pool
         pool.threadpool = ThreadPool(clock._reactor)
diff --git a/tests/server_notices/test_resource_limits_server_notices.py b/tests/server_notices/test_resource_limits_server_notices.py
index 47c53a5475..17f428bfc5 100644
--- a/tests/server_notices/test_resource_limits_server_notices.py
+++ b/tests/server_notices/test_resource_limits_server_notices.py
@@ -69,7 +69,7 @@ class TestResourceLimitsServerNotices(unittest.HomeserverTestCase):
         self._rlsn = rlsn
 
         self._rlsn._store.user_last_seen_monthly_active = AsyncMock(return_value=1000)
-        self._rlsn._server_notices_manager.send_notice = AsyncMock(  # type: ignore[assignment]
+        self._rlsn._server_notices_manager.send_notice = AsyncMock(  # type: ignore[method-assign]
             return_value=Mock()
         )
         self._send_notice = self._rlsn._server_notices_manager.send_notice
@@ -82,8 +82,8 @@ class TestResourceLimitsServerNotices(unittest.HomeserverTestCase):
         self._rlsn._server_notices_manager.maybe_get_notice_room_for_user = AsyncMock(
             return_value="!something:localhost"
         )
-        self._rlsn._store.add_tag_to_room = AsyncMock(return_value=None)  # type: ignore[assignment]
-        self._rlsn._store.get_tags_for_room = AsyncMock(return_value={})  # type: ignore[assignment]
+        self._rlsn._store.add_tag_to_room = AsyncMock(return_value=None)  # type: ignore[method-assign]
+        self._rlsn._store.get_tags_for_room = AsyncMock(return_value={})  # type: ignore[method-assign]
 
     @override_config({"hs_disabled": True})
     def test_maybe_send_server_notice_disabled_hs(self) -> None:
@@ -100,13 +100,13 @@ class TestResourceLimitsServerNotices(unittest.HomeserverTestCase):
     def test_maybe_send_server_notice_to_user_remove_blocked_notice(self) -> None:
         """Test when user has blocked notice, but should have it removed"""
 
-        self._rlsn._auth_blocking.check_auth_blocking = AsyncMock(  # type: ignore[assignment]
+        self._rlsn._auth_blocking.check_auth_blocking = AsyncMock(  # type: ignore[method-assign]
             return_value=None
         )
         mock_event = Mock(
             type=EventTypes.Message, content={"msgtype": ServerNoticeMsgType}
         )
-        self._rlsn._store.get_events = AsyncMock(  # type: ignore[assignment]
+        self._rlsn._store.get_events = AsyncMock(  # type: ignore[method-assign]
             return_value={"123": mock_event}
         )
         self.get_success(self._rlsn.maybe_send_server_notice_to_user(self.user_id))
@@ -122,7 +122,7 @@ class TestResourceLimitsServerNotices(unittest.HomeserverTestCase):
         """
         Test when user has blocked notice, but notice ought to be there (NOOP)
         """
-        self._rlsn._auth_blocking.check_auth_blocking = AsyncMock(  # type: ignore[assignment]
+        self._rlsn._auth_blocking.check_auth_blocking = AsyncMock(  # type: ignore[method-assign]
             return_value=None,
             side_effect=ResourceLimitError(403, "foo"),
         )
@@ -130,7 +130,7 @@ class TestResourceLimitsServerNotices(unittest.HomeserverTestCase):
         mock_event = Mock(
             type=EventTypes.Message, content={"msgtype": ServerNoticeMsgType}
         )
-        self._rlsn._store.get_events = AsyncMock(  # type: ignore[assignment]
+        self._rlsn._store.get_events = AsyncMock(  # type: ignore[method-assign]
             return_value={"123": mock_event}
         )
 
@@ -142,7 +142,7 @@ class TestResourceLimitsServerNotices(unittest.HomeserverTestCase):
         """
         Test when user does not have blocked notice, but should have one
         """
-        self._rlsn._auth_blocking.check_auth_blocking = AsyncMock(  # type: ignore[assignment]
+        self._rlsn._auth_blocking.check_auth_blocking = AsyncMock(  # type: ignore[method-assign]
             return_value=None,
             side_effect=ResourceLimitError(403, "foo"),
         )
@@ -155,7 +155,7 @@ class TestResourceLimitsServerNotices(unittest.HomeserverTestCase):
         """
         Test when user does not have blocked notice, nor should they (NOOP)
         """
-        self._rlsn._auth_blocking.check_auth_blocking = AsyncMock(  # type: ignore[assignment]
+        self._rlsn._auth_blocking.check_auth_blocking = AsyncMock(  # type: ignore[method-assign]
             return_value=None
         )
 
@@ -168,7 +168,7 @@ class TestResourceLimitsServerNotices(unittest.HomeserverTestCase):
         Test when user is not part of the MAU cohort - this should not ever
         happen - but ...
         """
-        self._rlsn._auth_blocking.check_auth_blocking = AsyncMock(  # type: ignore[assignment]
+        self._rlsn._auth_blocking.check_auth_blocking = AsyncMock(  # type: ignore[method-assign]
             return_value=None
         )
         self._rlsn._store.user_last_seen_monthly_active = AsyncMock(return_value=None)
@@ -184,7 +184,7 @@ class TestResourceLimitsServerNotices(unittest.HomeserverTestCase):
         Test that when server is over MAU limit and alerting is suppressed, then
         an alert message is not sent into the room
         """
-        self._rlsn._auth_blocking.check_auth_blocking = AsyncMock(  # type: ignore[assignment]
+        self._rlsn._auth_blocking.check_auth_blocking = AsyncMock(  # type: ignore[method-assign]
             return_value=None,
             side_effect=ResourceLimitError(
                 403, "foo", limit_type=LimitBlockingTypes.MONTHLY_ACTIVE_USER
@@ -199,7 +199,7 @@ class TestResourceLimitsServerNotices(unittest.HomeserverTestCase):
         """
         Test that when a server is disabled, that MAU limit alerting is ignored.
         """
-        self._rlsn._auth_blocking.check_auth_blocking = AsyncMock(  # type: ignore[assignment]
+        self._rlsn._auth_blocking.check_auth_blocking = AsyncMock(  # type: ignore[method-assign]
             return_value=None,
             side_effect=ResourceLimitError(
                 403, "foo", limit_type=LimitBlockingTypes.HS_DISABLED
@@ -218,21 +218,21 @@ class TestResourceLimitsServerNotices(unittest.HomeserverTestCase):
         When the room is already in a blocked state, test that when alerting
         is suppressed that the room is returned to an unblocked state.
         """
-        self._rlsn._auth_blocking.check_auth_blocking = AsyncMock(  # type: ignore[assignment]
+        self._rlsn._auth_blocking.check_auth_blocking = AsyncMock(  # type: ignore[method-assign]
             return_value=None,
             side_effect=ResourceLimitError(
                 403, "foo", limit_type=LimitBlockingTypes.MONTHLY_ACTIVE_USER
             ),
         )
 
-        self._rlsn._is_room_currently_blocked = AsyncMock(  # type: ignore[assignment]
+        self._rlsn._is_room_currently_blocked = AsyncMock(  # type: ignore[method-assign]
             return_value=(True, [])
         )
 
         mock_event = Mock(
             type=EventTypes.Message, content={"msgtype": ServerNoticeMsgType}
         )
-        self._rlsn._store.get_events = AsyncMock(  # type: ignore[assignment]
+        self._rlsn._store.get_events = AsyncMock(  # type: ignore[method-assign]
             return_value={"123": mock_event}
         )
         self.get_success(self._rlsn.maybe_send_server_notice_to_user(self.user_id))
diff --git a/tests/storage/test_appservice.py b/tests/storage/test_appservice.py
index 48f39df9fe..cbce26a725 100644
--- a/tests/storage/test_appservice.py
+++ b/tests/storage/test_appservice.py
@@ -338,7 +338,7 @@ class ApplicationServiceTransactionStoreTestCase(unittest.HomeserverTestCase):
 
         # we aren't testing store._base stuff here, so mock this out
         # (ignore needed because Mypy won't allow us to assign to a method otherwise)
-        self.store.get_events_as_list = AsyncMock(return_value=events)  # type: ignore[assignment]
+        self.store.get_events_as_list = AsyncMock(return_value=events)  # type: ignore[method-assign]
 
         self.get_success(self._insert_txn(self.as_list[1]["id"], 9, other_events))
         self.get_success(self._insert_txn(service.id, 10, events))
diff --git a/tests/storage/test_monthly_active_users.py b/tests/storage/test_monthly_active_users.py
index 0bf706ba08..49366440ce 100644
--- a/tests/storage/test_monthly_active_users.py
+++ b/tests/storage/test_monthly_active_users.py
@@ -252,7 +252,7 @@ class MonthlyActiveUsersTestCase(unittest.HomeserverTestCase):
         )
         self.get_success(d)
 
-        self.store.upsert_monthly_active_user = AsyncMock(return_value=None)  # type: ignore[assignment]
+        self.store.upsert_monthly_active_user = AsyncMock(return_value=None)  # type: ignore[method-assign]
 
         d = self.store.populate_monthly_active_users(user_id)
         self.get_success(d)
@@ -260,9 +260,9 @@ class MonthlyActiveUsersTestCase(unittest.HomeserverTestCase):
         self.store.upsert_monthly_active_user.assert_not_called()
 
     def test_populate_monthly_users_should_update(self) -> None:
-        self.store.upsert_monthly_active_user = AsyncMock(return_value=None)  # type: ignore[assignment]
+        self.store.upsert_monthly_active_user = AsyncMock(return_value=None)  # type: ignore[method-assign]
 
-        self.store.is_trial_user = AsyncMock(return_value=False)  # type: ignore[assignment]
+        self.store.is_trial_user = AsyncMock(return_value=False)  # type: ignore[method-assign]
 
         self.store.user_last_seen_monthly_active = AsyncMock(return_value=None)
         d = self.store.populate_monthly_active_users("user_id")
@@ -271,9 +271,9 @@ class MonthlyActiveUsersTestCase(unittest.HomeserverTestCase):
         self.store.upsert_monthly_active_user.assert_called_once()
 
     def test_populate_monthly_users_should_not_update(self) -> None:
-        self.store.upsert_monthly_active_user = AsyncMock(return_value=None)  # type: ignore[assignment]
+        self.store.upsert_monthly_active_user = AsyncMock(return_value=None)  # type: ignore[method-assign]
 
-        self.store.is_trial_user = AsyncMock(return_value=False)  # type: ignore[assignment]
+        self.store.is_trial_user = AsyncMock(return_value=False)  # type: ignore[method-assign]
         self.store.user_last_seen_monthly_active = AsyncMock(
             return_value=self.hs.get_clock().time_msec()
         )
@@ -356,7 +356,7 @@ class MonthlyActiveUsersTestCase(unittest.HomeserverTestCase):
 
     @override_config({"limit_usage_by_mau": False, "mau_stats_only": False})
     def test_no_users_when_not_tracking(self) -> None:
-        self.store.upsert_monthly_active_user = AsyncMock(return_value=None)  # type: ignore[assignment]
+        self.store.upsert_monthly_active_user = AsyncMock(return_value=None)  # type: ignore[method-assign]
 
         self.get_success(self.store.populate_monthly_active_users("@user:sever"))
 
diff --git a/tests/test_federation.py b/tests/test_federation.py
index 779f70467b..f8ade6da38 100644
--- a/tests/test_federation.py
+++ b/tests/test_federation.py
@@ -80,7 +80,7 @@ class MessageAcceptTests(unittest.HomeserverTestCase):
         ) -> None:
             pass
 
-        federation_event_handler._check_event_auth = _check_event_auth  # type: ignore[assignment]
+        federation_event_handler._check_event_auth = _check_event_auth  # type: ignore[method-assign]
         self.client = self.hs.get_federation_client()
 
         async def _check_sigs_and_hash_for_pulled_events_and_fetch(
@@ -190,7 +190,7 @@ class MessageAcceptTests(unittest.HomeserverTestCase):
 
         # Register the mock on the federation client.
         federation_client = self.hs.get_federation_client()
-        federation_client.query_user_devices = Mock(side_effect=query_user_devices)  # type: ignore[assignment]
+        federation_client.query_user_devices = Mock(side_effect=query_user_devices)  # type: ignore[method-assign]
 
         # Register a mock on the store so that the incoming update doesn't fail because
         # we don't share a room with the user.
@@ -240,7 +240,7 @@ class MessageAcceptTests(unittest.HomeserverTestCase):
 
         # Register mock device list retrieval on the federation client.
         federation_client = self.hs.get_federation_client()
-        federation_client.query_user_devices = AsyncMock(  # type: ignore[assignment]
+        federation_client.query_user_devices = AsyncMock(  # type: ignore[method-assign]
             return_value={
                 "user_id": remote_user_id,
                 "stream_id": 1,
diff --git a/tests/test_state.py b/tests/test_state.py
index eded38c766..9c8679cc1d 100644
--- a/tests/test_state.py
+++ b/tests/test_state.py
@@ -714,7 +714,7 @@ class StateTestCase(unittest.TestCase):
         store = _DummyStore()
         store.register_events(old_state_1)
         store.register_events(old_state_2)
-        self.dummy_store.get_events = store.get_events  # type: ignore[assignment]
+        self.dummy_store.get_events = store.get_events  # type: ignore[method-assign]
 
         context: EventContext
         context = yield self._get_context(
@@ -773,7 +773,7 @@ class StateTestCase(unittest.TestCase):
         store = _DummyStore()
         store.register_events(old_state_1)
         store.register_events(old_state_2)
-        self.dummy_store.get_events = store.get_events  # type: ignore[assignment]
+        self.dummy_store.get_events = store.get_events  # type: ignore[method-assign]
 
         context: EventContext
         context = yield self._get_context(
diff --git a/tests/unittest.py b/tests/unittest.py
index 40672a4415..5d3640d8ac 100644
--- a/tests/unittest.py
+++ b/tests/unittest.py
@@ -395,9 +395,9 @@ class HomeserverTestCase(TestCase):
                     )
 
                 # Type ignore: mypy doesn't like us assigning to methods.
-                self.hs.get_auth().get_user_by_req = get_requester  # type: ignore[assignment]
-                self.hs.get_auth().get_user_by_access_token = get_requester  # type: ignore[assignment]
-                self.hs.get_auth().get_access_token_from_request = Mock(return_value=token)  # type: ignore[assignment]
+                self.hs.get_auth().get_user_by_req = get_requester  # type: ignore[method-assign]
+                self.hs.get_auth().get_user_by_access_token = get_requester  # type: ignore[method-assign]
+                self.hs.get_auth().get_access_token_from_request = Mock(return_value=token)  # type: ignore[method-assign]
 
         if self.needs_threadpool:
             self.reactor.threadpool = ThreadPool()  # type: ignore[assignment]