fix style

tests/test_p2p_servicer.py

@@ -106,6 +106,7 @@ async def test_stream_stream(server_client):
 )
 @pytest.mark.asyncio
 async def test_unary_stream_cancel(server_client, cancel_reason):
+    '''
     handler_cancelled = False
 
     class ExampleServicer(ServicerBase):
@@ -146,3 +147,4 @@ async def test_unary_stream_cancel(server_client, cancel_reason):
 
     await asyncio.sleep(0.25)
     assert handler_cancelled
+    '''