[issue11509] fileinput module unit test coverage improvements

[Roundup Robot]

Roundup Robot <devnull at devnull> added the comment:

New changeset 9448691fe084 by briancurtin in branch 'default':
Add news item for #11509.
http://hg.python.org/cpython/rev/9448691fe084

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