模拟AsNoTracking实体框架 [英] Mock AsNoTracking Entity Framework

问题描述

我如何模拟AsNoTracking方法？
在下面的示例中，DbContext注入到服务类中。如果从GetOrderedProducts方法中删除AsNoTracking扩展方法，但是AsNoTracking测试失败，因为它返回null，它可以正常工作。
我也试图模拟AsNoTracking返回正确的值，但它没有起作用。

How do I mock AsNoTracking method?
In below example, DbContext has injected to the service class.It works fine if I remove AsNoTracking extension method from GetOrderedProducts method, but with AsNoTracking test fails because it returns null. I've also tried to mock AsNoTracking to return proper value but it didn't work.

public interface IUnitOfWork
{
    IDbSet<TEntity> Set<TEntity>() where TEntity : class;
    int SaveAllChanges();
}

public class Entites : DbContext, IUnitOfWork
{
    public virtual DbSet<Product> Products { get; set; }  // This is virtual because Moq needs to override the behaviour

    public new virtual IDbSet<TEntity> Set<TEntity>() where TEntity : class   // This is virtual because Moq needs to override the behaviour 
    {
        return base.Set<TEntity>();
    }

    public int SaveAllChanges()
    {
        return base.SaveChanges();
    }
}

    public class ProductService
{
    private readonly IDbSet<Product> _products;
    private readonly IUnitOfWork _uow;

    public ProductService(IUnitOfWork uow)
    {
        _uow = uow;
        _products = _uow.Set<Product>();
    }
    public IEnumerable<Product> GetOrderedProducts()
    {
        return _products.AsNoTracking().OrderBy(x => x.Name).ToList();
    }
}

    [TestFixture]
public class ProductServiceTest
{
    private readonly ProductService _productService;

    public ProductServiceTest()
    {
        IQueryable<Product> data = GetRoadNetworks().AsQueryable();
        var mockSet = new Mock<DbSet<Product>>();
        mockSet.As<IQueryable<Product>>().Setup(m => m.Provider).Returns(data.Provider);
        mockSet.As<IQueryable<Product>>().Setup(m => m.Expression).Returns(data.Expression);
        mockSet.As<IQueryable<Product>>().Setup(m => m.ElementType).Returns(data.ElementType);
        mockSet.As<IQueryable<Product>>().Setup(m => m.GetEnumerator()).Returns(data.GetEnumerator());
        var context = new Mock<Entites>();
        context.Setup(c => c.Products).Returns(mockSet.Object);
        context.Setup(m => m.Set<Product>()).Returns(mockSet.Object);
        context.Setup(c => c.Products.AsNoTracking()).Returns(mockSet.Object);
        _productService = new ProductService(context.Object);
    }

    private IEnumerable<Product> GetRoadNetworks()
    {
        return new List<Product>
        {
            new Product
            {
                Id = 1,
                Name = "A"
            },
            new Product
            {
                Id = 2,
                Name = "B"
            },
            new Product
            {
                Id = 1,
                Name = "C"
            }
        };
    }

    [Test]
    public void GetOrderedProductTest()
    {
        IEnumerable<Product> products = _productService.GetOrderedProducts();
        List<string> names = products.Select(x => x.Name).ToList();
        var expected = new List<string> {"A", "B", "C"};
        CollectionAssert.AreEqual(names, expected);
    }
}

问题是单元测试中的AsNoTracking返回null

The problem is AsNoTracking returns null in unit test

推荐答案

查看<$ c $的源代码 c> AsNoTracking（）扩展方法：

Looking at the source code of the AsNoTracking() extension method:

public static IQueryable AsNoTracking(this IQueryable source)
{
    var asDbQuery = source as DbQuery;
    return asDbQuery != null ? asDbQuery.AsNoTracking() : CommonAsNoTracking(source);
}

由于源您的 DbSet< Product> 您正在尝试嘲笑）确实是一个 DbQuery （因为 DbSet 源自 DbQuery ），它尝试调用真实（非嘲笑） AsNoTracking（）方法，正确返回null。

Since source (your DbSet<Product> you're trying to mock) is indeed a DbQuery (because DbSet is deriving from DbQuery), it tries to invoke the 'real' (non-mocked) AsNoTracking() method which rightfully returns null.

尝试模拟 AsNoTracking（）方法：

mockSet.Setup(x => x.AsNoTracking()).Returns(mockSet.Object);

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