Automation Integration testing by OWIN to Self-Host ASP.NET Web API

As I tried to implement integration by automation testing at testing the ASP.NET Web API pipeline using its in-memory hosting capabilities. So, I will show how to host ASP.NET Web API, using OWIN to self-host the Web API framework.

First, create a dummy app to test and install a package

Install-Package Microsoft.AspNet.WebApi.OwinSelfHost

After that, we will create a dummy ApiController on project WebAPI.

using System.Web.Http;
namespace TestExampleOwinStartUp.Controllers
{
    public class DemoController : ApiController
    {
        // GET api/values/5 
        public string Get(int id)
        {
            return "value";
        }
    }
}

Then this being an Owin app, let’s create a Startup class, where we configure the Web API routes

using Owin;
using System.Web.Http;
namespace OwinSelfhostSample
{
    public class Startup
    {
        public void Configuration(IAppBuilder appBuilder)
        {
            HttpConfiguration config = new HttpConfiguration();
            config.Routes.MapHttpRoute(
                name: "DefaultApi",
                routeTemplate: "api/{controller}/{id}",
                defaults: new { id = RouteParameter.Optional }
            );
            appBuilder.UseWebApi(config);
            config.MapHttpAttributeRoutes();
            config.EnsureInitialized();
        }
    }
}

And I will run start the OWIN Host and make a request with HttpClient and I use xUnit

using System.Net.Http;
using System.Threading.Tasks;
using Microsoft.Owin.Hosting;
using OwinSelfhostSample;
using Xunit;
namespace OwinSelfhostSample_test
{
    public class UnitTest1
    {
        [Fact]
        public async Task Test1()
        {
            var baseAddress = "http://localhost:5050/";
            var endPoint = "api/demo/1";
            HttpResponseMessage response;
using (WebApp.Start<Startup>(url: baseAddress))
            {
                HttpClient client = new HttpClient();
                response = await client.GetAsync(baseAddress + endPoint);
            }
Assert.Equal("OK", response.StatusCode.ToString());
}
    }
}

So, after I tried to use Owin self-host instance of an in-memory test server per test fixture, and It allows each test to use it to make HTTP calls through the OWIN.

Let’s go to play around on it and I hope your guys will enjoy doing automation testing.