[issue21918] Convert test_tools to directory

[Zachary Ware]

Zachary Ware added the comment:

Here's the same patch in --git format, which should make the actual changes clearer (though probably not in Rietveld).

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Added file: http://bugs.python.org/file35906/test_tools.diff--git

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<http://bugs.python.org/issue21918>
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