Louie Lu added the comment:

It seem setUpModule will smash out the test, I've add a trust-will-work test 
inside the test_configdialog.py:

class Test(unittest.TestCase):
    def setUp(self):
        self.root = tkinter.Tk()

    def test_test(self):
        self.root.bind('<KeyRelease-Up>', lambda x: print('testing'))
        self.root.update()
        self.root.event_generate('<KeyRelease-Up>')


This will print out `testing` when commet out setUpModule's `root = Tk()` line. 
But if this line is running, then the trust-test won't print out `testing`

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue30870>
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