为什么我收到此错误消息:预期 #1，实际 #0? [英] Why I got this error message: Expected #1, Actual #0?

问题描述

为什么以下使用 Rhino Mocks 的测试代码会引发此异常:预期 #1，实际 #0?

Why the following test code using Rhino Mocks raises this exception: Expected #1, Actual #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.
    }

推荐答案

可能是因为期待购物车对象的返回.

Probably because expecting returning of cart object.

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

Maybe you may use Stub instead of Expect and verify using AssertWasCalled.

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());
}

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