Properly designate async test methods

Author: vchudnov-g

tests/asyncio/test_operation_async.py

@@ -164,7 +164,7 @@ async def test_exception():
 
 @mock.patch("asyncio.sleep", autospec=True)
 @pytest.mark.asyncio
-async def test_unexpected_result(unused_sleep):
+async async def test_unexpected_result(unused_sleep):
     responses = [
         make_operation_proto(),
         # Second operation response is done, but has not error or response.
@@ -178,7 +178,7 @@ async def test_unexpected_result(unused_sleep):
 
 
 @pytest.mark.asyncio
-def test_from_gapic():
+async def test_from_gapic():
     operation_proto = make_operation_proto(done=True)
     operations_client = mock.create_autospec(
         operations_v1.OperationsClient, instance=True