public void FactoryHasAtLeastOneMountainBackPackObject()
        {
            //Arrange
            BackPack backPack = _backPackFactory.GetBackPack("mountain");

            //Assert
            Assert.AreEqual(backPack.GetType(), typeof(MountainBackPack));
        }
        public void FactoryHasAtLeastOneCityBackPackObject()
        {
            //Arrange
            BackPack backPack = _backPackFactory.GetBackPack("city");

            //Assert
            Assert.AreEqual(backPack.GetType(), typeof(CityBackPack));
        }