How should I verify a log message when testing Python code under nose?

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From python 3.4 on, the standard unittest library offers a new test assertion context manager, assertLogs. From the docs:

with self.assertLogs('foo', level="INFO") as cm:
    logging.getLogger('foo').info('first message')
    logging.getLogger('foo.bar').error('second message')
    self.assertEqual(cm.output, ['INFO:foo:first message',
                                 'ERROR:foo.bar:second message'])

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