[issue7712] Add a context manager to change cwd in test.test_support and run the test suite in a temp dir.

[Florent Xicluna]

Florent Xicluna <laxyf at yahoo.fr> added the comment:

Brian, is it the only one failing?
Did you have some test running before? Which one? (alphabetic order?)

Do you reproduce the error when running this test alone?
  "-m test.regrtest -uall test_bufio"

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7712>
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