@Test
void findAllPetTypes() {

   PetType type1 = petData.createType("type1");
   PetType type2 = petData.createType("Another type");
   List<PetType> petTypes = petScreen.getTypes();
   List<PetType> petTypesAgain = petScreen.getTypes();
   petTypes.retainAll(asList(type1, type2));
   assertSame(type1, petTypes.get(1));
   assertSame(type2, petTypes.get(0));
   assertSame(petTypes, petTypesAgain);
}