remove unused test code

Author: parthea

tests/aio/test__helpers.py

@@ -65,11 +65,7 @@ async def test_response_log_debug_disabled(logger, caplog, base_logger):
 
 @pytest.mark.asyncio
 async def test_response_log_debug_enabled_response_json(logger, caplog, base_logger):
-    class MockResponse:
-        async def json(self):
-            return {"key1": "value1", "key2": "value2", "key3": "value3"}
-
-    response = MockResponse()
+    response = None
     caplog.set_level(logging.DEBUG, logger=_MOCK_CHILD_LOGGER_NAME)
     await _helpers.response_log_async(logger, response)
     assert len(caplog.records) == 1