async def METHOD_NAME(self, mock_processor):
    """Test that process_update calls do_process_update."""
    update = Update(1)
    async def coroutine():
        pass
    await mock_processor.process_update(update, coroutine())
    # This flag is set in the mock processor in do_process_update, telling us that
    # do_process_update was called.
    assert mock_processor.test_flag