Terry J. Reedy added the comment:
I forgot to mention that with this particular shutdown order
@classmethod
def tearDownClass(cls):
del cls.text, cls.editwin
cls.root.destroy()
del cls.root
the shutdown warning message we have seen about not handling an event went
away. Even though editwin is a dummy, it had to be deleted -- I suspect to
delete its reference to the gui text widget.
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