[issue15351] Add to unittest.TestCase support for using context managers

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

That should have been

   self.addCleanup(MyContextManager.__exit__)

You could alternatively call __exit__() explicitly in tearDown, of course, but I believe addCleanup is a more reliable cleanup than tearDown.

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<http://bugs.python.org/issue15351>
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