[issue14534] Add method to mark unittest.TestCases as "do not run".

[Michael Foord]

Michael Foord added the comment:

If you're writing a mixin you don't need to derive from TestCase, you just derive from object. The point of this feature is to allow TestCase subclasses to be "base classes" instead of being used as a mixin.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue14534>
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