我應該為控制器或服務層或兩者都編寫單元測試嗎？

我正在學習並嘗試為我的項目使用單元測試。但是當我嘗試使用單元測試編寫展示時，我看到控制器的單元測試與服務層的單元測試相同。下面是我為控制器和服務層編寫的單元測試程式碼

控制器測試：

 private Mock<ICountryService> _countryServiceMock;
 CountryController objController;
 List<Country> listCountry;

 [TestInitialize]
 public void Initialize()
 {

     _countryServiceMock = new Mock<ICountryService>();
     objController = new CountryController(_countryServiceMock.Object);
     listCountry = new List<Country>() {
      new Country() { Id = 1, Name = "US" },
      new Country() { Id = 2, Name = "India" },
      new Country() { Id = 3, Name = "Russia" }
     };
 }

 [TestMethod]
 public void Country_Get_All()
 {
     //Arrange
     _countryServiceMock.Setup(x => x.GetAll()).Returns(listCountry);

     //Act
     var result = ((objController.Index() as ViewResult).Model) as List<Country>;

     //Assert
     Assert.AreEqual(result.Count, 3);
     Assert.AreEqual("US", result[0].Name);
     Assert.AreEqual("India", result[1].Name);
     Assert.AreEqual("Russia", result[2].Name);

 }

服務測試：

 private Mock<ICountryRepository> _mockRepository;
 private ICountryService _service;
 Mock<IUnitOfWork> _mockUnitWork;
 List<Country> listCountry;

 [TestInitialize]
 public void Initialize()
 {
     _mockRepository = new Mock<ICountryRepository>();
     _mockUnitWork = new Mock<IUnitOfWork>();
     _service = new CountryService(_mockUnitWork.Object, _mockRepository.Object);
     listCountry = new List<Country>() {
      new Country() { Id = 1, Name = "US" },
      new Country() { Id = 2, Name = "India" },
      new Country() { Id = 3, Name = "Russia" }
     };
 }

 [TestMethod]
 public void Country_Get_All()
 {
     //Arrange
     _mockRepository.Setup(x => x.GetAll()).Returns(listCountry);

     //Act
     List<Country> results = _service.GetAll() as List<Country>;

     //Assert
     Assert.IsNotNull(results);
     Assert.AreEqual(3, results.Count);
 }

在控制器級別，我傾向於編寫端到端測試。沒有嘲笑，沒有贗品，只有真實的東西。

原因是在您上面的測試中，您的單元測試與控制器操作的實現細節相耦合。假設您不再使用儲存庫或工作單元，您的測試甚至將不再編譯。在這個級別，您應該關注測試行為，而不是實現。

我對隔離域模型進行單元測試，其餘部分進行集成測試。

引用自：https://stackoverflow.com/questions/28614641