[PySide] Creating and deleting instances of QApplication within unit tests

[Aaron Richiger]

Hello Dan!

Sorry for not having replied to your question so far... Don't 
overestimate our testing capabilities;-)
Below, you can see some example code with a class with multiple tests. 
Hope it helps...
Aaron

import unittest
import sys

from PySide.QtGui import *
from PySide.QtCore import *
from PySide.QtTest import *


class TestDemo(unittest.TestCase):

     @classmethod
     def setUpClass(cls):
         try:
             cls.app = QApplication(sys.argv)
         except:
             pass

     def test_widget_1(self):
         w1 = QPushButton()
         w1.clicked.connect(self.slot)
         QTest.mouseClick(w1, Qt.LeftButton)
         self.assertTrue(self.clicked)

     def test_widget_2(self):
         w2 = QPushButton()
         w2.clicked.connect(self.slot)
         QTest.mouseClick(w2, Qt.LeftButton)
         self.assertTrue(self.clicked)

     def slot(self):
         self.clicked = True


if __name__ == '__main__':
     unittest.main()




Am 29.10.2013 20:33, schrieb Dan McCombs:
> Ok, let me ask this question -
>
> Someone out there must be unit testing their PySide code. Could you 
> give an example of a test class with multiple separate tests?
>
> Thanks!
>
> -Dan
>
> --
> Dan McCombs
> Senior Software Engineer / Dyn
> http://dyn.com/
>
> Are you prepared for website disaster? Find out in two minutes:
> http://dyn.com/dynedu-disaster-planning/
>
>
> On Sat, Oct 26, 2013 at 8:01 AM, Dan McCombs <dmccombs at dyn.com 
> <mailto:dmccombs at dyn.com>> wrote:
>
>     Hi Matthew,
>
>     Yes, the first thing I tried was:
>
>        app = QtGui.QApplication([])
>        ...
>        del app
>
>     But, the next test raises the exception about there already being
>     a QApplication instance when it runs that first line. That's why I
>     resorted to poking around trying to figure out where PySide is
>     keeping track of that original instance causing it to raise that
>     exception.
>
>     -Dan
>
>
>     --
>     Dan McCombs
>     Senior Software Engineer / Dyn
>     http://dyn.com/
>
>     Are you prepared for website disaster? Find out in two minutes:
>     http://dyn.com/dynedu-disaster-planning/
>
>
>     On Fri, Oct 25, 2013 at 3:13 PM, Dan McCombs <dmccombs at dyn.com
>     <mailto:dmccombs at dyn.com>> wrote:
>
>         Hey all,
>
>         I've been struggling with unit testing my PySide application.
>         My tests run fine, but if I have more than one test, Python
>         segfaults on quit. It seems the solution would be to
>         destroy/create the QApplication instance on each test run, as
>         I've seen people mentioning in the case of PyQT such as:
>
>         http://stuvel.eu/blog/127/multiple-instances-of-qapplication-in-one-process
>
>         I've tried doing something similar in PySide with the
>         following lines in my setUp for each test:
>
>         QtGui.qApp = QtGui.QApplication([])
>
>         And the following in my tearDown:
>
>         QtGui.quit()
>         QtGui.qApp = none
>
>         However, the instance still exists (I can get it via
>         QtGui.QApplication.instance()) and when the second test setUp
>         starts to run, I get an exception that "A QApplication
>         instance already exists.".
>
>         How can I fully remove the QApplication instance between tests?
>
>         Thanks,
>
>         -Dan
>
>
>
>
>
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