Method test_is_valid

Lib/test/test_string/test_string.py:505–524

(self)

                         'tim likes to eat a bag of ham worth $100')

    def test_is_valid(self):
        eq = self.assertEqual
        s = Template('$who likes to eat a bag of ${what} worth $$100')
        self.assertTrue(s.is_valid())

        s = Template('$who likes to eat a bag of ${what} worth $100')
        self.assertFalse(s.is_valid())

        # if the pattern has an unrecognized capture group,
        # it should raise ValueError like substitute and safe_substitute do
        class BadPattern(Template):
            pattern = r"""
            (?P<badname>.*)                  |
            (?P<escaped>@{2})                   |
            @(?P<named>[_a-z][._a-z0-9]*)       |
            @{(?P<braced>[_a-z][._a-z0-9]*)}    |
            (?P<invalid>@)                      |
            """
        s = BadPattern('@bag.foo.who likes to eat a bag of @bag.what')
        self.assertRaises(ValueError, s.is_valid)

    def test_get_identifiers(self):
        eq = self.assertEqual