assertEquals(1, validators.length);
        assertEquals(CronExpressionValidator.class, validators[0]);
    }

    // Test validation with valid cron expressions
    @Test
    public void test_validCronExpressions() {
        TestBean bean = new TestBean();

        // Test null value (should be valid)
        bean.setCronExpression(null);
        Set<ConstraintViolation<TestBean>> violations = validator.validate(bean);