Anton Barkovsky <swarmer...@gmail.com> added the comment:

The warning is printed by the file object when it closes itself in __del__:

  ResourceWarning: unclosed file <_io.TextIOWrapper name='/dev/null' mode='r+' 
encoding='UTF-8'>

There isn't much to test, or is there?

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue15447>
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