SelfHostWebApiTests

MyWebApiIntegrationTests.cs

  [TestFixture]
  public class MyWebApiIntegrationTests
  {

    [Test]
    public void ShouldWorkWithWebApi4()
    {
      var config = new HttpSelfHostConfiguration("http://localhost:8080");

      config.Routes.MapHttpRoute(
        "Api",
        "api/{controller}/{id}",
        new { id = RouteParameter.Optional, folder = "" }
      );

      new HttpSelfHostServer(config)
          .OpenAsync()
          .ContinueWith(task =>
                          {
                            var request = WebRequest.Create("http://localhost:8080/api/Things");

                            var response = request.GetResponse();

                            var reader = new StreamReader(response.GetResponseStream());

                            reader.ReadToEnd().Should().Contain("Boo");

                          })
          .Wait();
    }

Are you sure this code is doing what you expected? When I tried it with a base address of http://in-memory (an invalid address on my network), I got an error:

System.AggregateException : One or more errors occurred.
  ----> System.Net.WebException : The remote name could not be resolved: 'in-memory'

This suggests to me that WebRequest is actually not communicating with your self-host server. I've been successfully using HttpClient and HttpRequestMessage to work around this.