public void RetrieveLeftOverSize()
        {
            int expectedValue = 10;
            int actualValue   = wagon.RetrieveLeftOverSize();

            Assert.AreEqual(expectedValue, actualValue);
        }
        public void RetrieveLeftOverSize1()
        {
            wagon.InsertInWagon(MockAnimals.testAnimals[0]);
            int actualValue = wagon.RetrieveLeftOverSize();

            Assert.AreEqual(9, actualValue);
        }