1 files changed, 7 insertions, 7 deletions
diff --git a/tests/util/test_rwlock.py b/tests/util/test_rwlock.py
index 5da04362a9..bc93de62eb 100644
--- a/tests/util/test_rwlock.py
+++ b/tests/util/test_rwlock.py
@@ -49,7 +49,7 @@ class ReadWriteLockTestCase(unittest.TestCase):
         acquired_d: "Deferred[None]" = Deferred()
         unblock_d: "Deferred[None]" = Deferred()
 
-        async def reader_or_writer():
+        async def reader_or_writer() -> str:
             async with read_or_write(key):
                 acquired_d.callback(None)
                 await unblock_d
@@ -134,7 +134,7 @@ class ReadWriteLockTestCase(unittest.TestCase):
                 d.called, msg="deferred %d was unexpectedly resolved" % (i + n)
             )
 
-    def test_rwlock(self):
+    def test_rwlock(self) -> None:
         rwlock = ReadWriteLock()
         key = "key"
 
@@ -197,7 +197,7 @@ class ReadWriteLockTestCase(unittest.TestCase):
         _, acquired_d = self._start_nonblocking_reader(rwlock, key, "last reader")
         self.assertTrue(acquired_d.called)
 
-    def test_lock_handoff_to_nonblocking_writer(self):
+    def test_lock_handoff_to_nonblocking_writer(self) -> None:
         """Test a writer handing the lock to another writer that completes instantly."""
         rwlock = ReadWriteLock()
         key = "key"
@@ -216,7 +216,7 @@ class ReadWriteLockTestCase(unittest.TestCase):
         d3, _ = self._start_nonblocking_writer(rwlock, key, "write 3 completed")
         self.assertTrue(d3.called)
 
-    def test_cancellation_while_holding_read_lock(self):
+    def test_cancellation_while_holding_read_lock(self) -> None:
         """Test cancellation while holding a read lock.
 
         A waiting writer should be given the lock when the reader holding the lock is
@@ -242,7 +242,7 @@ class ReadWriteLockTestCase(unittest.TestCase):
         )
         self.assertEqual("write completed", self.successResultOf(writer_d))
 
-    def test_cancellation_while_holding_write_lock(self):
+    def test_cancellation_while_holding_write_lock(self) -> None:
         """Test cancellation while holding a write lock.
 
         A waiting reader should be given the lock when the writer holding the lock is
@@ -268,7 +268,7 @@ class ReadWriteLockTestCase(unittest.TestCase):
         )
         self.assertEqual("read completed", self.successResultOf(reader_d))
 
-    def test_cancellation_while_waiting_for_read_lock(self):
+    def test_cancellation_while_waiting_for_read_lock(self) -> None:
         """Test cancellation while waiting for a read lock.
 
         Tests that cancelling a waiting reader:
@@ -319,7 +319,7 @@ class ReadWriteLockTestCase(unittest.TestCase):
         )
         self.assertEqual("write 2 completed", self.successResultOf(writer2_d))
 
-    def test_cancellation_while_waiting_for_write_lock(self):
+    def test_cancellation_while_waiting_for_write_lock(self) -> None:
         """Test cancellation while waiting for a write lock.
 
         Tests that cancelling a waiting writer: