id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
7694	Models that are imported into tests.py (and utilize signals) result in parallel tests that break test cases	Dave Naffziger	nobody	"In a sample models.py file:

{{{
def MyModel(models.Model):
    """"""
    >>> u=User.objects.create_user('test2','te...@test.com')
    >>> u.email='new'
    >>> u.save()
    """"""
    anyfield = models.BooleanField()

COUNT = 0

def user_pre_save(sender, instance, signal, *args, **kwargs):
    global COUNT
    r = random.randint(1,50)
    print 'pre_save: count: %s random: %s' %(COUNT, r)
    COUNT +=1

dispatcher.connect(user_pre_save, signal=signals.pre_save,
sender=User)
}}}

Then create a tests.py and add this import (that's all you need):
{{{
from myproject.models import MyModel 
}}}

Here is what the test output looks like.  Note that it looks like we're creating two duplicate threads each with their own state (COUNT doesn't increment between the runs of user_pre_save, but random is different.


{{{
pre_save: count: 0 random: 49
pre_save: count: 0 random: 23
...
Failed example:
    u=User.objects.create_user('test2','te...@test.com')
Expected nothing
Got:
    pre_save: count: 1 random: 13
    pre_save: count: 1 random: 2
...

Failed example:
    u.save()
Expected nothing
Got:
    pre_save: count: 2 random: 18
    pre_save: count: 2 random: 49 
}}}


I've not been able to figure out what is causing this."		closed	Testing framework	dev		invalid			Unreviewed	0	0	0	0	0	0