Method checkPatternError

Lib/test/test_re.py:48–55

(self, pattern, errmsg, pos=None)

        recurse(actual, expect)

    def checkPatternError(self, pattern, errmsg, pos=None):
        with self.assertRaises(re.PatternError) as cm:
            re.compile(pattern)
        with self.subTest(pattern=pattern):
            err = cm.exception
            self.assertEqual(err.msg, errmsg)
            if pos is not None:
                self.assertEqual(err.pos, pos)

    def checkTemplateError(self, pattern, repl, string, errmsg, pos=None):
        with self.assertRaises(re.PatternError) as cm: