assertEquals(1, helper.ruleList.size());
        IntervalRule rule = helper.ruleList.get(0);
        assertEquals(1000, rule.getDelay());
    }

    @Test
    public void test_addIntervalRule_emptyDays() {
        IntervalControlHelper helper = new IntervalControlHelper();
        helper.addIntervalRule("10:00", "18:00", "", 1000);

        assertEquals(1, helper.ruleList.size());