Method expect_parsing_failure

Lib/test/test_clinic.py:790–795

(
        self, *, filename, expected_error, verify=True, output=None
    )

class ParseFileUnitTest(TestCase):
    def expect_parsing_failure(
        self, *, filename, expected_error, verify=True, output=None
    ):
        errmsg = re.escape(dedent(expected_error).strip())
        with self.assertRaisesRegex(ClinicError, errmsg):
            parse_file(filename, limited_capi=False)

    def test_parse_file_no_extension(self) -> None:
        self.expect_parsing_failure(