Unit Test ASP.NET Web API controller with fake HTTPContext

Question

I\'m using the following approach to upload files through ASP.NET Web API controllers.

[System.Web.Http.HttpPost]
public HttpResponseMessage UploadFile()
{
          


        

Answer 1

Since you have no control over those classes why not wrap/abstract the functionality behind one do control

IRequestService request;

[HttpPost]
public HttpResponseMessage UploadFile() {
    HttpResponseMessage response;

    try {
        int id = 0;
        int? qId = null;
        if (int.TryParse(request.GetFormValue("id"), out id)) {
            qId = id;
        }

        var file = request.GetFile(0);

        int filePursuitId = bl.UploadFile(qId, file);
    } catch (Exception ex) {
        //...
    }

    return response;
}

Where request is one of your custom defined types IRequestService

public interface IRequestService {
    string GetFormValue(string key);
    HttpPostedFileBase GetFile(int index);
    //...other functionality you may need to abstract
}

and can be implemented like this to be injected into your controller

public class RequestService : IRequestService {

    public string GetFormValue(string key) {
        return HttpContext.Current.Request.Form[key];
    }

    public HttpPostedFileBase GetFile(int index) {
        return new HttpPostedFileWrapper(HttpContext.Current.Request.Files[index]);
    }
}

in your unit test

var requestMock = new Mock();
//you then setup the mock to return your fake data
//...
//and then inject it into your controller
var controller = new MyController(requestMock.Object);
//Act
response = controller.UploadFile();