Method expect_failure

Lib/test/test_clinic.py:2966–2969

(self, *args)

        return out

    def expect_failure(self, *args):
        out, err, code = self.run_clinic(*args)
        self.assertNotEqual(code, 0, f"Unexpected success: {args=}")
        return out, err

    def test_external(self):
        CLINIC_TEST = 'clinic.test.c'