为什么我收到此错误消息：预期＃1，实际＃0？

Question

为什么使用Rhino Mocks的以下测试代码会引发此异常：预期为＃1，实际为＃0？

    int PRODUCT_ID = 1;
    [TestMethod]
    public void If_Cart_Already_Exists_Then_AddToBasket_Should_Use_It_ByCallingIShoppingCartGetCart() 
    {
        ShoppingCart cart = new ShoppingCart();  //without UserName as ctor parameter

        IShoppingCartRepository shoppingCartRepository = MockRepository.GenerateMock<IShoppingCartRepository>();
        shoppingCartRepository.Expect(r => r.GetCart()).Return(cart);

        ShoppingCartController c = new ShoppingCartController(shoppingCartRepository); //DI
        c.AddToCart(PRODUCT_ID);//interAct

        shoppingCartRepository.VerifyAllExpectations(); //Error: IShoppingCartRepository.GetCart(); Expected #1, Actual #0.
    }

Answer 1

可能是因为期待购物车对象的回归。

也许您可以使用Stub而不是Expect并使用AssertWasCalled进行验证。

public void If_Cart_Already_Exists_Then_AddToBasket_Should_Use_It_ByCallingIShoppingCartGetCart() 
{
    ShoppingCart cart = new ShoppingCart();  //without UserName as ctor parameter

    IShoppingCartRepository shoppingCartRepository = MockRepository.GenerateMock<IShoppingCartRepository>();
    shoppingCartRepository.Stub(r => r.GetCart()).Return(cart);

    ShoppingCartController c = new ShoppingCartController(shoppingCartRepository); //DI
    c.AddToCart(PRODUCT_ID);//interAct

    shoppingCartRepository.AssertWasCalled(r => r.GetCart());
}