@Test
  public void checkGettingIngsofCake() {

    cManager.removeAll();
    iManager.removeAll();
    rManager.removeAll();

    Cake cake = new Cake(CAKE_NAME, CAKE_PRICE, CAKE_WEIGHT);
    cManager.addCake(cake);
    cake = cManager.getAll().get(0);

    int i = 0;
    for (String n : ING_NAMES) {
      Ingredient ing = new Ingredient(n, ING_KINDS.get(i));
      iManager.addIngredient(ing);
      i++;
    }
    List<Ingredient> ings = iManager.getAll();

    for (Ingredient ing : ings) rManager.addRelationship(cake, ing);

    List<Ingredient> ingsOfCake = rManager.getIngdredientsOfCake(cake);

    i = 0;
    for (Ingredient ing : ingsOfCake) {
      assertEquals(ING_NAMES.get(i), ing.getName());
      assertEquals(ING_KINDS.get(i), ing.getKind());
      i++;
    }
  }