human
I wrote the below code

    async_popen = MagicMock()
    @asyncio.coroutine
    def communicate(input=None):
        'Communicate    mock.'
        fixture = bytes(load_fixture('alpr_stdout.txt'), 'utf-8')
        return (fixture, None)
    async_popen.communicate = communicate
    return async_popen

What's a good function header?
 ... Here's a good function header?
assistant
#Here's a good function header.

@asyncio.coroutine
def mock_async_subprocess():