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

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

If anything gets moved, it needs to be part of a very well thought-out plan with the same high threshold for approval that it would have had if it weren't in test_support.

The unittest module already brims with complexity and would suffer quite a bit if a hodge-podge of functions were added.

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