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    )
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class ErrorTests(tests.TestCase):
 
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    def test_invalid_pattern(self):
 
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        error = lazy_regex.InvalidPattern('Bad pattern msg.')
 
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        self.assertEqualDiff("Invalid pattern(s) found. Bad pattern msg.",
 
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            str(error))
 
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class InstrumentedLazyRegex(lazy_regex.LazyRegex):
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    """Keep track of actions on the lazy regex"""
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        p = lazy_regex.lazy_compile('RE:[')
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        # As p.match is lazy, we make it into a lambda so its handled
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        # by assertRaises correctly.
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        e = self.assertRaises(errors.InvalidPattern, lambda: p.match('foo'))
 
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        e = self.assertRaises(lazy_regex.InvalidPattern, lambda: p.match('foo'))
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        self.assertEqual(e.msg, '"RE:[" unexpected end of regular expression')
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