[issue8273] move generally useful test_support functions into the unittest package

[Ezio Melotti]

Ezio Melotti <ezio.melotti at gmail.com> added the comment:

Also note that the test_support module is for some reason documented here: http://docs.python.org/library/test.html#module-test.test_support
This means that there are probably developers out there that are already using these functions even if some of them are not intended/designed to be used outside the Python test suite.
This situation is sub-optimal for two reasons:
1) test_support can't evolve quickly because the documented functions have to be backward-compatible;
2) other developers are using these python-test-suite-specific functions in their tests;
It would be better to keep test_support for our test suite only and provide/move useful function in unittest.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue8273>
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