ASP.NET Web API Testing Multi-User Form File Download

Question

I am trying to use N-UNIT to test my web API application, but I cannot find a suitable way to test the way files are uploaded. Which method is best for testing a method?

Web API Controller:

[AcceptVerbs("post")] public async Task<HttpResponseMessage> Validate() { // Check if the request contains multipart/form-data. if (!Request.Content.IsMimeMultipartContent()) { return Request.CreateErrorResponse(HttpStatusCode.UnsupportedMediaType,"please submit a valid request"); } var provider = new MultipartMemoryStreamProvider(); // this loads the file into memory for later on processing try { await Request.Content.ReadAsMultipartAsync(provider); var resp = new HttpResponseMessage(HttpStatusCode.OK); foreach (var item in provider.Contents) { if (item.Headers.ContentDisposition.FileName != null) { Stream stream = item.ReadAsStreamAsync().Result; // do some stuff and return response resp.Content = new StringContent(result, Encoding.UTF8, "application/xml"); //text/plain "application/xml" return resp; } } return resp; } catch (System.Exception e) { return Request.CreateErrorResponse(HttpStatusCode.InternalServerError, e); } } 

Answer 1

After spending a bit of time browsing through the WebClient, I was able to come up with this:

  try { var imageFile = Path.Combine("dir", "fileName"); WebClient webClient = new WebClient(); byte[] rawResponse = webClient.UploadFile(string.Format("{0}/api/values/", "http://localhost:12345/"), imageFile); Console.WriteLine("Sever Response: {0}", System.Text.Encoding.ASCII.GetString(rawResponse)); // for debugging purposes Console.WriteLine("File Upload was successful"); } catch (WebException wexc) { Console.WriteLine("Failed with an exception of " + wexc.Message); // anything other than 200 will trigger the WebException } 

Answer 2

According to the comment above, an example is given below:

 HttpClient client = new HttpClient(); MultipartFormDataContent formDataContent = new MultipartFormDataContent(); formDataContent.Add(new StringContent("Hello World!"),name: "greeting"); StreamContent file1 = new StreamContent(File.OpenRead(@"C:\Images\Image1.jpeg")); file1.Headers.ContentType = new MediaTypeHeaderValue("image/jpeg"); file1.Headers.ContentDisposition = new ContentDispositionHeaderValue("form-data"); file1.Headers.ContentDisposition.FileName = "Image1.jpeg"; formDataContent.Add(file1); StreamContent file2 = new StreamContent(File.OpenRead(@"C:\Images\Image2.jpeg")); file2.Headers.ContentType = new MediaTypeHeaderValue("image/jpeg"); file2.Headers.ContentDisposition = new ContentDispositionHeaderValue("form-data"); file2.Headers.ContentDisposition.FileName = "Image1.jpeg"; formDataContent.Add(file2); HttpResponseMessage response = client.PostAsync("http://loclhost:9095/api/fileuploads", formDataContent).Result; 

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Request for wire:

 POST http://localhost:9095/api/fileuploads HTTP/1.1 Content-Type: multipart/form-data; boundary="34d56c28-919b-42ab-8462-076b400bd03f" Host: localhost:9095 Content-Length: 486 Expect: 100-continue Connection: Keep-Alive --34d56c28-919b-42ab-8462-076b400bd03f Content-Type: text/plain; charset=utf-8 Content-Disposition: form-data; name=greeting Hello World! --34d56c28-919b-42ab-8462-076b400bd03f Content-Type: image/jpeg Content-Disposition: form-data; filename=Image1.jpeg ----Your Image here------- --34d56c28-919b-42ab-8462-076b400bd03f Content-Type: image/jpeg Content-Disposition: form-data; filename=Image2.jpeg ----Your Image here------- --34d56c28-919b-42ab-8462-076b400bd03f--