ASP.NET MVC 2-请告诉我为什么在单元测试中存储库在控制器中不返回任何数据

问题描述

|| 我遇到的问题是我的单元测试失败，当我逐步了解逻辑时，我不知道为什么。我有一个单元测试，该单元测试在查看单个类别的产品（即属于“图书”类别的产品）时失败。通过测试调试时，我注意到在StoreController.List方法的前几行中返回了零个“ products”。如果调用GetProducts（）或GetProductsByCategoryTypeDescription（），则会发生这种情况，但不会返回任何内容。根据我的模拟，数据应该返回并且我对为什么不返回感到困惑。如果需要，我也可以显示我的实体，但是在这种情况下，我认为它们并不重要... 要注意的最大事情是我的测试失败，但是当手动测试应用程序时，它似乎可以正常工作。我认为问题在于我如何潜在地设置我的模拟。 .NET：V 4.0 测试工具：NUnit v2.5 模拟框架：Moq 4.0 DI：Ninject 2.2 ORM：Linq 2 SQL 我的资料库：

public class ProductCategoryRepository : IProductCategoryRepository
{
    private Table<ProductCategory> productCategoryTable;

    private IQueryable<ProductCategory> ProductsCategories
    {
        get { return productCategoryTable; }
    }

    public ProductCategoryRepository(string connectionString)
    {
        productCategoryTable = (new DataContext(connectionString)).GetTable<ProductCategory>();
    }

    public IQueryable<ProductCategory> GetProductCategories()
    {
        return ProductsCategories;
    }
}

}

public class ProductRepository : IProductRepository
{
    private Table<Product> productTable;

    private IQueryable<Product> Products
    {
        get { return productTable; }
    }

    public ProductRepository(string connectionString)
    {
        var dc = new DataContext(connectionString);
        productTable = dc.GetTable<Product>(); 

    }
    public IQueryable<Product> GetProducts()
    {
        return this.Products;
    }

    public IQueryable<Product> GetProductsByCategoryTypeDescription(string productCategoryDescription)
    {
        return this.Products.Where(x => x.ProductCategory.Description == productCategoryDescription);
    }
}

我的控制器出现问题：

    public ViewResult List(string category,int page = 1) //Use default value
    {
        var productsToShow = (category == null)
            ? productRepository.GetProducts()
            : productRepository.GetProductsByCategoryTypeDescription(category);

        var viewModel = new ProductListViewModel
        {
            Products = productsToShow.Skip((page - 1) * this.PageSize)
                                     .Take(PageSize)
                                     .ToList(),PagingInfo = new PagingInfo
            {
                CurrentPage = page,ItemsPerPage = PageSize,TotalItems = productsToShow.Count()
            },CurrentCategory = category
        };

        return View(viewModel);
    }

我的单元测试：

    [Test]
    public void Can_View_Products_From_A_Single_Category()
    {
        // Arrange: If two products are in two different categories...
        IProductRepository productRepository = UnitTestHelpers.MockProductRepository(
            new Sermon { Name = \"Sermon1\",ProductCategory = new ProductCategory { ProductCategoryId = 1,Description = \"Sermons\" } },new Sermon { Name = \"Sermon2\",ProductCategory = new ProductCategory { ProductCategoryId = 2,Description = \"Books\" } }
            );

        IProductCategoryRepository productCategoryRepository = UnitTestHelpers.MockProductCategoryRepository(
            new ProductCategory { ProductCategoryId = 1,Description = \"Sermons\" });

        var controller = new StoreController(productRepository,productCategoryRepository);

        // Act: ... then when we ask for one specific category
        var result = controller.List(\"Sermons\",1);

        // Arrange: ... we get only the product from that category
        var viewModel = (ProductListViewModel)result.ViewData.Model;
        viewModel.Products.Count.ShouldEqual(1);
        viewModel.Products[0].Name.ShouldEqual(\"Sermon1\");
        viewModel.CurrentCategory.ShouldEqual(\"Sermons\");
    }

    public static void ShouldEqual<T>(this T actualValue,T expectedValue)
    {
        Assert.AreEqual(expectedValue,actualValue);
    }

    public static IProductRepository MockProductRepository(params Product[] products)
    {
        // Generate an implementer of IProductRepository at runtime using Moq
        var mockProductRepos = new Mock<IProductRepository>();
        mockProductRepos.Setup(x => x.GetProducts()).Returns(products.AsQueryable());
        return mockProductRepos.Object;
    }

    public static IProductCategoryRepository MockProductCategoryRepository(params ProductCategory[] productCategories)
    {
        // Generate an implementer of IProductRepository at runtime using Moq
        var mockProductCategoryRepos = new Mock<IProductCategoryRepository>();
        mockProductCategoryRepos.Setup(x => x.GetProductCategories()).Returns(productCategories.AsQueryable());
        return mockProductCategoryRepos.Object;
    }

    public static void ShouldBeRedirectionTo(this ActionResult actionResult,object expectedRouteValues)
    {
        var actualValues = ((RedirectToRouteResult)actionResult).RouteValues;
        var expectedValues = new RouteValueDictionary(expectedRouteValues);

        foreach (string key in expectedValues.Keys)
            actualValues[key].ShouldEqual(expectedValues[key]);
    }

public static class UnitTestHelpers
{
    public static void ShouldEqual<T>(this T actualValue,actualValue);
    }

    public static IProductRepository MockProductRepository(params Product[] products)
    {
        // Generate an implementer of IProductRepository at runtime using Moq
        var mockProductRepos = new Mock<IProductRepository>();
        mockProductRepos.Setup(x => x.GetProducts()).Returns(products.AsQueryable());
        return mockProductRepos.Object;
    }

    public static IProductCategoryRepository MockProductCategoryRepository(params ProductCategory[] productCategories)
    {
        // Generate an implementer of IProductRepository at runtime using Moq
        var mockProductCategoryRepos = new Mock<IProductCategoryRepository>();
        mockProductCategoryRepos.Setup(x => x.GetProductCategories()).Returns(productCategories.AsQueryable());
        return mockProductCategoryRepos.Object;
    }

}

解决方法

list方法的第一行如下：

public ViewResult List(string category,int page = 1) //Use default value
{
    var productsToShow = (category == null)
        ? productRepository.GetProducts()
        : productRepository.GetProductsByCategoryTypeDescription(category);

在测试中调用list方法时，如下所示：

var result = controller.List(\"Sermons\",1);

根据呼叫站点，我们可以看到category参数不为null。这意味着List方法将跳过productRepository.GetProducts()调用而改为执行productRepository.GetProductsByCategoryTypeDescription(category)调用。查看您的设置存储库模拟的帮助程序，我们看到：

public static IProductRepository MockProductRepository(params Product[] products)
{
    // Generate an implementer of IProductRepository at runtime using Moq
    var mockProductRepos = new Mock<IProductRepository>();
    mockProductRepos.Setup(x => x.GetProducts()).Returns(products.AsQueryable());
    return mockProductRepos.Object;
}

由此可见，未在IProductRepository上设置GetProductsByCategoryTypeDescription方法，它将返回null或空的IEnumerable<Product>。您需要显式设置此方法以返回所需的集合。我建议添加一个新的帮助程序，或用以下类似的方法替换现有的帮助程序：

public static IProductRepository MockProductRepository(string category,params Product[] products)
{
    // Generate an implementer of IProductRepository at runtime using Moq
    var mockProductRepos = new Mock<IProductRepository>();
    mockProductRepos.Setup(x => x.GetProductsByCategoryTypeDescription(category)).Returns(products.AsQueryable());
    return mockProductRepos.Object;
}

然后更改单元测试以使用该助手。将类别变量添加到测试中，以确保\“ Sermons \”值仅在一个位置进行硬编码。

// Arrange: If two products are in two different categories...
string category = \"Sermons\";
IProductRepository productRepository = UnitTestHelpers.MockProductRepository(
    category,new Sermon { Name = \"Sermon1\",ProductCategory = new ProductCategory { ProductCategoryId = 1,Description = \"Sermons\" } },new Sermon { Name = \"Sermon2\",ProductCategory = new ProductCategory { ProductCategoryId = 2,Description = \"Books\" } }
    );

再次将类别变量用于\“ Act \”步骤：

// Act: ... then when we ask for one specific category
var result = controller.List(category,1);

这样可以解决您的零产品问题。要注意的另一件事是，对于此单元测试，您设置了一个模拟IProductCategoryRepository，但似乎根本没有使用它。也许有一些未显示的代码需要它。但是如果不是这样，那么您可能应该只使用一个普通的，未初始化的模拟（即将新的Mock<IProductCategoryRepository>().Object直接传递给控制器构造函数），以明确此特定测试中不涉及该对象。 ,仅仅通过查看您发布的代码，我认为您可能会缺少模拟的概念。在查看单元测试时，我们没有理由看到您的依赖关系的具体实现，因为它们是被模拟/存根的。该测试应该做的就是验证您对控制器与存储库依赖项交互的期望。

2-asp.net mvc mvc 中不单元单元告诉存储存储控制器控制器数据数据数据测试测试测试返回返回

ASP.NET MVC 2-请告诉我为什么在单元测试中存储库在控制器中不返回任何数据

问题描述

解决方法

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