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

        assertTrue(ruleManager.removeRule(rule2));
        assertTrue(ruleManager.removeRule(rule1));
        assertTrue(ruleManager.removeRule(rule3));

        assertEquals(0, ruleManager.getRuleCount());
    }

    /**
     * Test hasRule with existing rule
     */

        @Override
        public void addRule(Rule rule) {
        }

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

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

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

    /**

        public void addRule(int index, Rule rule) {
            if (rule != null) {
                rules.add(index, rule);
            }
        }

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

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