}

    public void test_initialize() {
        final CronExpression cronExpression = null;
        validator.initialize(cronExpression);
    }

    public void test_determineValid_invalidExpressions() {
        assertFalse(validator.determineValid("invalid"));
        assertFalse(validator.determineValid("too many fields here * * * * * * *"));
        assertFalse(validator.determineValid("* * * *"));
    }