[TIP] Testing asynchronous method

[Gary Bernhardt]

I almost wrote this reply when I saw the thread. I think you should
absolutely write a mocked version as you propose. But you also want a
few integration tests to at least notice if the magic smoke comes out,
so you're back to needing some kind of reactor. :)

--
Gary
http://destroyallsoftware.com



On Tue, Oct 18, 2011 at 6:44 PM, Herman Sheremetyev <herman at swebpage.com> wrote:
> Maybe I'm missing something, but why can't you just set up a mock or
> spy on the callback with any of the existing tools?
>
> Flexmock example:
>
> from flexmock import flexmock
>
> class TestMyAsync(unittest.TestCase):
>   def test_async_method(self):
>       x = SomeAsyncModules()
>       flexmock(x).should_call('callback').once # will let the
> callback method run and just check that it did
>       # -- or --
>       # flexmock(x).should_receive('callback').once # will stub
> callback out but check that it was called
>       x.async_method(999, x.callback)
>
> More details here:
>
> http://has207.github.com/flexmock/
>
> Flexmock has a number of facilities that let you make assertions about
> whether things have been done or not. Whether they're async or not
> shouldn't make a difference..
>
> -Herman
>
> On Wed, Oct 19, 2011 at 2:40 AM, Pere Martir <pere.martir4 at gmail.com> wrote:
>> I want to test if a callback is called within a predefined time. I am
>> surprised that I cannot find a simple solution on Internet.
>>
>> I don't want to use Twisted Trial or tornado.testing but only Python
>> built-in unittest, is it possible ? I am developing  an asynchronous
>> library by TDD, and I don't want to depend on Twisted or Tornado.
>>
>> http://twistedmatrix.com/trac/wiki/TwistedTrial
>> http://www.tornadoweb.org/documentation/testing.html
>>
>> Inspired by tornado.testing, I've implemented the following, which I
>> believe is not correct:
>>
>>
>> class TestMyAsync(unittest.TestCase):
>>    def setUp(self):
>>        self._stopped = False
>>
>>    def _wait(self, timeout):
>>        if self._stopped: return True
>>        t = 0
>>        self._running = True
>>        while self._running:
>>            time.sleep(1)
>>            if not self._running:
>>                break
>>            t += 1
>>            if t == timeout:
>>                return False
>>        return True
>>
>>    def _stop(self):
>>        self._stopped = True
>>        self._running = False
>>
>>    def test_async_method(self):
>>        def callback(ticket):
>>            self.assertEqual(ticket, 998)
>>            self._stop()
>>        x = SomeAysncModules()
>>        x.async_method(999, callback)
>>        self.assertTrue(self._wait(3))
>>
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