assertFalse(validator.determineValid("too many fields here * * * * * * *"));
        assertFalse(validator.determineValid("* * * *"));
    }

    @Test
    public void test_isValid_basicInvalidCronExpression() {
        final ConstraintValidatorContext context = null;
        assertFalse(validator.isValid("invalid cron", context));
        assertFalse(validator.isValid("too many fields * * * * * * *", context));