[issue19746] No introspective way to detect ModuleImportFailure in unittest

[Robert Collins]

Robert Collins added the comment:

Right: the existing code stringifies the original exception and creates an exception object and a closure
def test_thing(self):
    raise exception_obj

but that has the stringified original exception.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19746>
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