@Test public void addPerson() throws Exception { // setup Room anyRoom = new Room("test"); Person somebody = new Person("somebody"); Person somebodyElse = new Person("somebodyElse"); anyRoom.addPerson(somebody); anyRoom.addPerson(somebodyElse); ArrayList listOfPeopleInRoom = anyRoom.getPeopleInRoom(); // does the people exist in the room? assertTrue(anyRoom.getPeopleInRoom().contains(somebody)); assertTrue(anyRoom.getPeopleInRoom().contains(somebodyElse)); }