Styjun

I am building a Web API application which will be hosted in an IIS environment. In order to perform end to end integration testing of my service(no mocking), I am using OWIN.

The problem is deep down in my service architecture, at the repository layer I am making use of HttpContext.Current to retrieve values from the header(say UserId). See this answer

If you look into the above code, I am making use GetUserInfo method throughout my application to fetch current user information. Another way to do is pass it as a parameter in all method(which I don't personally want to do).

I went through this great answer about including IOwinContext into the repository. I have tried it and it worked for self-hosting, but my end goal is to deploy the application on IIS.

My Questions:

• Is there any way my code can handle both the use cases of OWIN self-hosting for integration testing & actual service deployment on IIS?


• Is there any issue with my architecture? Something like I shouldn't be using OWIN at all, and use other tools like POSTMAN for testing.

I can post some code if it's required.

Edit:

As suggested by @Nkosi I might have to mock my HeaderService in order to perform integration testing with owin. I am not sure how can I mock one certain method using moq. Here is my code. Its strip down version in order to make as simple as possible.

Code:

public class CreditController : ApiController

 private readonly ICreditService _creditService;

 public CreditController(ICreditService creditService)
 
 _creditService = creditService;
 

 public IHttpActionResult CreditSummary([FromUri]string requestId)
 
 var response = _creditService.GetCreditSummary(requestId);
 return Ok(response);
 


public class CreditService : ICreditService

 private readonly IHeaderService _headerService;
 private readonly ICreditRepository _creditRepository;

 public CreditService(ICreditRepository creditRepository, IHeaderService headerService)
 
 _headerService = headerService;
 _creditRepository = creditRepository;
 

 public CreditObj GetCreditSummary(string req)
 
 var userId = _headerService.GetHeaderFromHttpRequest();//Get User
 var response = _creditRepository.GetDataFromDatabase(req, userId);
 return response;
 


public interface IHeaderService

 string GetHeaderFromHttpRequest();


public class HeaderService : IHeaderService

 public string GetHeaderFromHttpRequest()
 
 return HttpContext.Current.Request.Headers["USERID"];
 

Below is my code for integration testing: I am using OWIN for self-host. So i want to call the controller method but my GetHeaderFromHttpRequest method should return mock response.

[TestClass]
public class IntegrationTest

 private static HttpClient _client;
 private static IDisposable _webApp;

 [ClassInitialize]
 public static void Init(TestContext testContext)
 
 _webApp = WebApp.Start<Startup>(url: Url);
 _client = new HttpClient
 
 BaseAddress = new Uri(Url)
 ;
 

 [TestMethod]
 public void TestDashboard()
 
 var headerStub = new Mock<IHeaderService>();
 headerStub.Setup(s => s.GetHeaderFromHttpRequest())
 .Returns("MockUserId");

 var builder = new UriBuilder(Url + "api/Credit/CreditSummary");

 HttpResponseMessage responseMessage = _client.GetAsync(builder.ToString()).Result;
 Assert.IsNotNull(responseMessage);
 


public class Startup

 public void Configuration(IAppBuilder app)
 
 var config = new HttpConfiguration();
 WebApiConfig.Register(config); //This method having all routing/dependancy configuration
 app.UseWebApi(config);
 

Problem:

• When I debug this test case, how do I make sure that _headerService.GetHeaderFromHttpRequest() return mock response. As of now I dont know how can i inject my mocking service to actual controller method call.

Any advise?

Based on @Nkosi's suggestion I was able to mock HeaderService for my integration testing.

Here is the code:

var container = new UnityContainer();

var mock = new Mock<IHeaderService>();
mock.Setup(x => x.GetHeaderFromHttpRequest()).Returns("MockId");
container.RegisterInstance(mock.Object);

I followed this topic and use HttpContextBase in my old project.

Moq: unit testing a method relying on HttpContext

HttpContextWrapper is a wrapper for the HttpContext class, can construct an HttpContextWrapper like this:

var wrapper = new HttpContextWrapper(HttpContext.Current);

You can mock an HttpContextBase and set up your expectations on it using Moq

var mockContext = new Mock<HttpContextBase>();