How to test Python 3.4 asyncio code?

Question

What\'s the best way to write unit tests for code using the Python 3.4 asyncio library? Assume I want to test a TCP client (SocketConnection):

Answer 1

async_test, suggested by Marvin Killing, definitely can help -- as well as direct calling loop.run_until_complete()

But I also strongly recommend to recreate new event loop for every test and directly pass loop to API calls (at least asyncio itself accepts loop keyword-only parameter for every call that need it).

Like

class Test(unittest.TestCase):
    def setUp(self):
        self.loop = asyncio.new_event_loop()
        asyncio.set_event_loop(None)

    def test_xxx(self):
        @asyncio.coroutine
        def go():
            reader, writer = yield from asyncio.open_connection(
                '127.0.0.1', 8888, loop=self.loop)
            yield from asyncio.sleep(0.01, loop=self.loop)
        self.loop.run_until_complete(go())

that isolates tests in test case and prevents strange errors like longstanding coroutine that has been created in test_a but finished only on test_b execution time.