[Twisted-Python] deferLater with trial issue

[Laurens Van Houtven]

You're supposed to clean up whatever junk you left in the reactor after your test. Do that in the tearDown method.

cheers
lvh



On 23 May 2012, at 23:30, Conway, Nicholas J wrote:

> Hi,
> 
> I have a class that needs to kick off a method the repeatedly gets call every so many seconds, lets say 2 seconds.
> 
> I chose to use task.deferLater to do this, but seems like LoopingCall gives similar results..  
> 
> I've boiled it down to the following example
> >>>>
> from twisted.internet import reactor, task
> from twisted.trial import unittest
> 
> class MyLoop(object):
>     def __init__(self):
>         self.updateParameters()
>     
>     def updateParameters(self):
>         d = task.deferLater(reactor, 2, self.dosomething)
> 
>     def dosomething(self):
>         print "cool"
> 
> class LoopTestCase(unittest.TestCase):
>     def setUp(self):
>         self.cL = MyLoop()
>     
>     def test_dummy(self):
>         d = defer.Deferred()
>         d.addCallback(lambda x: x)
>         d.callback(None)
>         return d	 # return a deferred just in case but happens either way
> >>>>>
> MyLoop works when running normally with a reactor.run(), but when I try run this test, I get the following error:
> 
> [ERROR]
> Traceback (most recent call last):
> Failure: twisted.trial.util.DirtyReactorAggregateError: Reactor was unclean.
> DelayedCalls: (set twisted.internet.base.DelayedCall.debug = True to debug)
> <DelayedCall 0x1018fbb90 [1.99891901016s] called=0 cancelled=0 Deferred.callback(None)>
> 
> So I don't fully understand what's going on to cause this.  Any pointers would be appreciated
> 
> Thanks,
> 
> -Nick
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