c# - 如何使用 Moq 从 Repository 中正确伪造 IQueryable？

Question

我有一个类在其构造函数中采用 IRepository，如下所示......

    public class UserService
    {
       public IRepository<User> _repo { get; set; }
       public UserService(IRepository<User> repo = null)
       {
        _repo = repo ?? new UserRepository();
       }

并且有一个看起来像这样的方法......

public bool IsUserActive(email string)
{
   //The method actually does more but to keep it simple lets imagine 
   // it does this
   User user = _repo.Find(u => u.Email == email).First();
   return user.IsActive;
}

IRepository 看起来像这样。

public interface IRepository<T> : IDisposable where T : IEntity
{
    void InsertOrUpdate(T entity);
    void Delete(T entity);
    IQueryable<T> Find(Func<T, bool> query);
    T Find(int id);
    void Save();
}

我想测试 IsUserActive 方法并确保它在用户的 IsActive 字段为 false 时返回 false，反之亦然。

我正在尝试以下...

    [Test]
    public void IsUserActive_EmailThatWillReturnInactiveUser_ReturnsFalse()
    {
        //Arrange
        var fakeUserRepo = new Mock<IRepository<User>>();
        var query = new Func<User, bool>(u => u.Email == "AnyString");
        var listOfMatchingUsers = new List<User>() 
        {
                    new User 
                    { 
                        Email = "AnyString", 
                        IsActive = False 
                    }
        };
        IQueryable<User> queryableUsers = listOfMatchingUsers.AsQueryable();
        fakeUserRepo.Setup(r => r.Find(query)).Returns(queryableUsers);
        var userService = new UserService(fakeUserRepo.Object);

        //Act
        var result = userService.IsUserActive("AnyString");

        //Assert
        Assert.IsFalse(result);
    }

当我在 NUnit 中运行时，我在这一行收到错误“Sequence Contains No Elements”

var result = userService.IsUserActive("AnyString");

我哪里错了？

Answer 1

将模拟设置更改为

fakeUserRepo.Setup(r => r.Find(It.IsAny<Func<User, bool>>()))
            .Returns(queryableUsers);