[issue24412] setUpClass equivalent for addCleanup

[Robert Collins]

Robert Collins added the comment:

Btw some things to be aware of in addressing this:

 - we will need tests that catchable exceptions raised from a setUpModule or setUpClass cause cleanups already registered to run
 - if (and I'd need to check this) setUpModule or setUpClass can nest - I think setUpModule may, in package.module contexts) - that non-local cleanups definitively run too

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24412>
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