WHERE语句在使用It.IsAny的单元测试中不起作用

Question

我对存储库的单元测试有一些问题，尤其是方法FindBy()

public IQueryable<T> FindBy(Expression<Func<T, bool>> predicate)
{
   return Entities.Where(predicate);
}

实体是IDbSet<T> Entities = _context.Set<T>();

我正在尝试在控制器中测试该方法，但是我总是在houses得到NULL 。
您能给我些建议吗？

public override HttpResponseMessage Get()
{
    var houses = Repository.FindBy(y => y.Year == DateTime.Now.Year);

    if (houses != null && houses.Any())
    {
        return Request.CreateResponse(HttpStatusCode.OK, houses);
    }

    const string message = "House: No content";
    return ErrorMsg(HttpStatusCode.NotFound, message);
}

这是我的测试方法

[TestMethod]
public void GetAll()
{   //Arrange
    var houses = new List<House>
     {
         new House {ID = 1, BuildNr = "01", HouseNr = "001" },
         new House {ID = 2, BuildNr = "02", HouseNr = "002" },
         new House {ID = 3, BuildNr = "03", HouseNr = "003" },
         new House {ID = 4, BuildNr = "04", HouseNr = "004" },
         new House {ID = 5, BuildNr = "05", HouseNr = "005" }
     };

    var mock = new Mock<IRepository<T>>();
    mock.Setup(m => m.FindBy(f => f.Year == It.IsAny<int>()))
        .Returns(houses.AsQueryable());
    //...

    var controller = new HouseController(mock.Object);
    //Action
    var response = controller.Get();
    var result = response.ContentToQueryable<T>();
    //Assert
    Assert.AreEqual(5, result.Count());
}

Answer 1

那不是使用It.IsAny的正确方法，IsAny旨在替代整个参数，而不是一个参数的一部分-在这种情况下，您可以像这样将它（某种方式）用于未指定的谓词：

 mock.Setup(m => m.FindBy(It.IsAny<Expression<Func<int, bool>>>())

您已经知道控制器方法将使用当前年份，请使用该年份进行设置：

mock.Setup(m => m.FindBy(f => f.Year == DateTime.Now.Year))

然后，如果不小心将控制器方法更改为使用错误的值，则测试将失败。