STINNER Victor added the comment:

You should call "cls.percolator.close()" in your tearDownClass() method, before 
cls.text.destroy().

By the way, I prefer to assign an attribute to None instead of using "del 
obj.attr".

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nosy: +haypo

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue21703>
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