FactHandle fireFact1 = ksession.insert(new Fire(room1));
ksession.fireAllRules();
assertEquals(1, events.size());
// phase 2
Sprinkler sprinkler1 = new Sprinkler(room1);
ksession.insert(sprinkler1);
ksession.fireAllRules();
assertEquals(2, events.size());
// phase 3