// A test that a room can be added to a map with one room in it.
 @Test
 public void addToOneRoomTest() {
   Map m = new Map();
   Room firstroom = Mockito.mock(Room.class);
   Room secondroom = Mockito.mock(Room.class);
   m.addRoom(firstroom);
   m.addRoom(secondroom);
   assertSame(secondroom, m.getLocation().northRoom);
 }
 // A test that a room can be added to an empty map.
 @Test
 public void addToEmptyMap() {
   Map m = new Map();
   Room firstroom = Mockito.mock(Room.class);
   m.addRoom(firstroom);
   assertSame(firstroom, m.getLocation());
 }