@Test(expected = IllegalArgumentException.class)
public void invalid_up_cast() {
CatCage catCage = new CatCage();
PetCage cage = (PetCage) catCage;
cage.enter(new Dog());
}
@Test
public void allows() {
Animal a = new Animal();
Cat c = new Cat();
Dog d = new Dog();
PersianCat pc = new PersianCat();
PetCage cage = new PetCage();
assertTrue(cage.allows(a));
assertTrue(cage.allows(c));
assertTrue(cage.allows(d));
assertTrue(cage.allows(pc));
PetCage catCage = new CatCage();
assertTrue(catCage.allows(c));
assertTrue(catCage.allows(pc));
assertFalse(catCage.allows(a));
assertFalse(catCage.allows(d));
}
@Test(expected = IllegalStateException.class)
public void takeOut_from_empty_cat_cage() {
PetCage cage = new CatCage();
cage.takeOut();
}
@Test
public void empty() {
PetCage cage = new PetCage();
PetCage catCage = new CatCage();
assertTrue(cage.isEmpty());
assertTrue(catCage.isEmpty());
Animal a = new Animal();
Cat c = new Cat();
cage.enter(a);
catCage.enter(c);
assertFalse(cage.isEmpty());
assertFalse(catCage.isEmpty());
cage.takeOut();
catCage.takeOut();
assertTrue(cage.isEmpty());
assertTrue(catCage.isEmpty());
}
