unittest.TestCase.assertRaisesRegex()

assertRaisesRegex(exception, regex, callable, *args, **kwds) assertRaisesRegex(exception, regex, msg=None)

Like assertRaises() but also tests that regex matches on the string representation of the raised exception. regex may be a regular expression object or a string containing a regular expression suitable for use by re.search(). Examples:

self.assertRaisesRegex(ValueError, "invalid literal for.*XYZ'$",
                       int, 'XYZ')

or:

with self.assertRaisesRegex(ValueError, 'literal'):
   int('XYZ')