public void AddDogToTheShoppingCart_ShouldAddToDogListInShoppingCart()
{
var dog = CreateFakeDog();
_shoppingCartService.AddDogToTheShoppingCart(dog);
_shoppingCartService.ShoppingCartDogList.Should().Contain(dog);
_shoppingCartService.ShoppingCartDogList[0].Should().BeEquivalentTo(dog);
_shoppingCartService.ShoppingCartDogList.Should().NotBeEmpty();
}