ASP.net MVC 4 WebApi - Testing MIME Multipart Content

asp.net-mvc, asp.net-web-api, c#

Solution

Altough the question was posted a while ago, i just had to deal with te same kind of problem.

This was my solution:

Create a fake implementation of the HttpControllerContext class where you add MultipartFormDataContent to the HttpRequestMessage.

public class FakeControllerContextWithMultiPartContentFactory
{
    public static HttpControllerContext Create()
    {
        var request = new HttpRequestMessage(HttpMethod.Post, "");
        var content = new MultipartFormDataContent();

        var fileContent = new ByteArrayContent(new Byte[100]);
        fileContent.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
        {
            FileName = "Foo.txt"
        };
        content.Add(fileContent);
        request.Content = content;

        return new HttpControllerContext(new HttpConfiguration(), new HttpRouteData(new HttpRoute("")), request);
    }

}

then in your test:

    [TestMethod]
    public void Should_return_OK_when_valid_file_posted()
    {
        //Arrange
        var sut = new yourController();

        sut.ControllerContext = FakeControllerContextWithMultiPartContentFactory.Create();

        //Act
        var result = sut.Post();

        //Arrange
        Assert.IsType<OkResult>(result.Result);
    }

Problem

I have an ASP.net MVC 4 (beta) WebApi that looks something like this: ``` public void Post() { if (!Request.Content.IsMimeMultipartContent("form-data")) { throw new HttpResponseException(HttpStatusCode.UnsupportedMediaType); } IEnumerable<HttpContent> parts = Request.Content.ReadAsMultipartAsync().Result; // Rest of code here. } ``` I am trying to unit test this code, but can't work out how to do it. Am I on the right track here? ``` [TestMethod] public void Post_Test() { MultipartFormDataContent content = new MultipartFormDataContent(); content.Add(new StringContent("bar"), "foo"); this.controller.Request = new HttpRequestMessage(); this.controller.Request.Content = content; this.controller.Post(); } ``` This code is throwing the following exception: System.AggregateException: One or more errors occurred. ---> System.IO.IOException: Unexpected end of MIME multipart stream. MIME multipart message is not complete. at System.Net.Http.MimeMultipartBodyPartParser.d__0.MoveNext() at System.Net.Http.HttpContentMultipartExtensions.MoveNextPart(MultipartAsyncContext context) at System.Net.Http.HttpContentMultipartExtensions.MultipartReadAsyncComplete(IAsyncResult result) at System.Net.Http.HttpContentMultipartExtensions.OnMultipartReadAsyncComplete(IAsyncResult result) Any idea what the best way to do this is?

Original source