Mocking async call in python 3.5

Question

How do I mock async call from one native coroutine to other one using unittest.mock.patch?

I currently have quite an awkward solution:

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Answer 1

Everyone's missing what's probably the simplest and clearest solution:

@patch('some.path')
def test(self, mock):
    f = asyncio.Future()
    f.set_result('whatever result you want')
    process_smtp_message.return_value = f
    mock.assert_called_with(1, 2, 3)

remember a coroutine can be thought of as just a function which is guaranteed to return a future which can, in turn be awaited.