第一次和第二次使用 Moq 時返回不同的值 - Different return values the first and second time with Moq

問題：

I have a test like this:我有一個這樣的測試：

    [TestCase("~/page/myaction")]
    public void Page_With_Custom_Action(string path) {
        // Arrange
        var pathData = new Mock<IPathData>();
        var pageModel = new Mock<IPageModel>();
        var repository = new Mock<IPageRepository>();
        var mapper = new Mock<IControllerMapper>();
        var container = new Mock<IContainer>();

        container.Setup(x => x.GetInstance<IPageRepository>()).Returns(repository.Object);

        repository.Setup(x => x.GetPageByUrl<IPageModel>(path)).Returns(() => pageModel.Object);

        pathData.Setup(x => x.Action).Returns("myaction");
        pathData.Setup(x => x.Controller).Returns("page");

        var resolver = new DashboardPathResolver(pathData.Object, repository.Object, mapper.Object, container.Object);

        // Act
        var data = resolver.ResolvePath(path);

        // Assert
        Assert.NotNull(data);
        Assert.AreEqual("myaction", data.Action);
        Assert.AreEqual("page", data.Controller);
    }

GetPageByUrl runs twice in my DashboardPathResolver , how can I tell Moq to return null the first time and pageModel.Object the second? GetPageByUrl在我的DashboardPathResolver運行兩次，我如何告訴 Moq 第一次返回null ，第二次返回pageModel.Object ？

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解決方案：

參考一： https://stackoom.com/question/UZoy
參考二： Different return values the first and second time with Moq