[issue15178] Doctest should handle situations when test files are not readable

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

I think that sounds reasonable.  The message should say files in all three cases', since the individual  test file summary method will be similar but talking about numbers of tests.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15178>
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