如何測試apicontroller？

Question

我嘗試爲我的控制器編寫一些單元測試。

[HttpPost] 
public Answer RegistrationSocial([FromBody] RegistrationSocialRequest newUser) 
{ 
    var answer = new Answer(); 
    try 
    { 
     userProvider.RegistrationSocial(newUser.Email, 
             newUser.PhoneNumber, 
             newUser.SocialProviderId, 
             newUser.SocialProvider, 
             UserIP); 
     answer.Result = 0; 
    } 
    catch (Exception e) 
    { 
     answer.Result = 2; 
     answer.Description = "Server error"; 
    } 
    return answer; 
} 

private string UserIP 
{ 
    get { return HttpContext.Current.Request.UserHostAddress; } 
} 

RegistrationSocialRequest只是模型綁定所需的POCO對象。這個方法返回json，我想跟蹤它的變化，只是爲了確保客戶端可以使用它。爲了測試，我使用Moq和MSTest。這是測試方法。

[TestMethod] 
public void IsJsonOkRegistrationSocial() 
{ 
    //Arrange 
    Mock<IUserProvider> mock = new Mock<IUserProvider>(); 
    mock.Setup(m => m.RegistrationSocial("lincoln@usa.gov", 
             "123", 
             "0987654321", 
              1, 
              "192.0.0.1")); 

    UserController controller = new UserController(mock.Object); 
    Answer answerOk = new Answer 
    { 
     Result = 0, 
     Caption = "Ok", 
     Description = null, 
     Data = null 
    }; 

    //Action 
    var answer = controller.RegistrationSocial(new RegistrationSocialRequest 
    { 
     SocialProvider = 1, 
     Email = "lincoln@usa.gov", 
     PhoneNumber = "123", 
     SocialProviderId = "0987654321" 
    }); 

    //Assert 
    Assert.AreEqual(JsonConvert.SerializeObject(answerOk), 
        JsonConvert.SerializeObject(answer)); 
} 

但是引發異常的方法，因爲UserIP爲空，我不能理解爲什麼。我是單元測試新手，也許這一切都可以以更簡單的方式完成。

Answer 1

當您在運行單元測試時在Web環境之外運行代碼時，HttpContext.Current.Request.UserHostAddress未按照您的預期設置。

解決方法是使用方法'GetUserIP'創建'IHttpContextService'。通過這種方式，您可以在UserIP屬性中調用此服務，並且在測試時可以模擬該接口。