Require types in tests.storage. (#14646)

Adds missing type hints to `tests.storage` package
and does not allow untyped definitions.

tests/storage/test_rollback_worker.py

@@ -14,10 +14,15 @@
 from typing import List
 from unittest import mock
 
+from twisted.test.proto_helpers import MemoryReactor
+
 from synapse.app.generic_worker import GenericWorkerServer
+from synapse.server import HomeServer
 from synapse.storage.database import LoggingDatabaseConnection
 from synapse.storage.prepare_database import PrepareDatabaseException, prepare_database
 from synapse.storage.schema import SCHEMA_VERSION
+from synapse.types import JsonDict
+from synapse.util import Clock
 
 from tests.unittest import HomeserverTestCase
 
@@ -39,13 +44,13 @@ def fake_listdir(filepath: str) -> List[str]:
 
 
 class WorkerSchemaTests(HomeserverTestCase):
-    def make_homeserver(self, reactor, clock):
+    def make_homeserver(self, reactor: MemoryReactor, clock: Clock) -> HomeServer:
         hs = self.setup_test_homeserver(
             federation_http_client=None, homeserver_to_use=GenericWorkerServer
         )
         return hs
 
-    def default_config(self):
+    def default_config(self) -> JsonDict:
         conf = super().default_config()
 
         # Mark this as a worker app.
@@ -53,7 +58,7 @@ class WorkerSchemaTests(HomeserverTestCase):
 
         return conf
 
-    def test_rolling_back(self):
+    def test_rolling_back(self) -> None:
         """Test that workers can start if the DB is a newer schema version"""
 
         db_pool = self.hs.get_datastores().main.db_pool
@@ -70,7 +75,7 @@ class WorkerSchemaTests(HomeserverTestCase):
 
         prepare_database(db_conn, db_pool.engine, self.hs.config)
 
-    def test_not_upgraded_old_schema_version(self):
+    def test_not_upgraded_old_schema_version(self) -> None:
         """Test that workers don't start if the DB has an older schema version"""
         db_pool = self.hs.get_datastores().main.db_pool
         db_conn = LoggingDatabaseConnection(
@@ -87,7 +92,7 @@ class WorkerSchemaTests(HomeserverTestCase):
         with self.assertRaises(PrepareDatabaseException):
             prepare_database(db_conn, db_pool.engine, self.hs.config)
 
-    def test_not_upgraded_current_schema_version_with_outstanding_deltas(self):
+    def test_not_upgraded_current_schema_version_with_outstanding_deltas(self) -> None:
         """
         Test that workers don't start if the DB is on the current schema version,
         but there are still outstanding delta migrations to run.