[issue11509] fileinput module unit test coverage improvements

[Denver Coneybeare]

Denver Coneybeare <denver.coneybeare at gmail.com> added the comment:

fileinput_unittests_v13.patch is the final patch.  Test coverage increased from 65% to 93% with this patch.  The only code left untested is fileinput._test(), which by its name suggests that testing is not required.

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<http://bugs.python.org/issue11509>
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