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

[Michael Foord]

Michael Foord added the comment:

Zachary: Inheriting from TestCase in your mixin is actually an anti-pattern. And yes, most people seem to do it (most people seem to misunderstand how to use mixins, which is why I like this approach of having a way of explicitly marking base classes).

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