ruleManager.addRule(rule1);
        ruleManager.addRule(rule2);
        ruleManager.addRule(rule3);

        assertTrue(ruleManager.hasRule(rule1));
        assertTrue(ruleManager.hasRule(rule2));
        assertTrue(ruleManager.hasRule(rule3));
        assertEquals(3, ruleManager.getRuleCount());
    }

    /**
     * Test adding null rule
     */
    public void test_addRule_null() {

            }
        }

        @Override
        public boolean removeRule(Rule rule) {
            return rules.remove(rule);
        }

        @Override
        public boolean hasRule(Rule rule) {
            return rules.contains(rule);
        }

        public List<Rule> getRules() {
            return new ArrayList<>(rules);
        }

        public void clearRules() {

        public void addRule(int index, Rule rule) {
        }

        @Override
        public boolean removeRule(Rule rule) {
            return false;
        }

        @Override
        public boolean hasRule(Rule rule) {
            return false;
        }
    }

    /**
     * Test implementation of IntervalController for testing
     */