[issue5679] cleanUp stack for unittest

[Michael Foord]

Michael Foord <michael at voidspace.org.uk> added the comment:

And actually your conditionally_undo_setup() call in setUp is incorrect.
It should in an except block that re-raises rather than a finally block
(which will do the cleanup even in non-exceptional circumstances). Easy
code to get wrong...

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5679>
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