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zTestCase._formatMessagec O s" t | | � } | j d | | � S)a= Fail unless an exception of class expected_exception is raised
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unexpected exception.
If called with the callable and arguments omitted, will return a
context object used like this::
with self.assertRaises(SomeException):
do_something()
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is used as a context object.
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is used as a context object.
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warning as the 'warning' attribute; similarly, the 'filename'
and 'lineno' attributes give you information about the line
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objects.
Example::
with self.assertLogs('foo', level='INFO') as cm:
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logging.getLogger('foo.bar').error('second message')
self.assertEqual(cm.output, ['INFO:foo:first message',
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