An in-memory HTTP server. Created for unit test

EmbeddedHttpServer.cs

using System;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace TetraPak.PIExecution.Subscriber.Clients.Tests
{
    public static class EmbeddedHttpServer
    {
        public static string GetLocalhostAddress()
        {
            var listener = new TcpListener(IPAddress.Loopback, 0);
            listener.Start();
            var port = ((IPEndPoint)listener.LocalEndpoint).Port;
            listener.Stop();

            return $"http://localhost:{port}/";
        }

        public static Task BasicHttpServer(string url, string output, string pattern = null)
        {
            return Task.Run(() =>
            {
                var listener = new HttpListener();
                listener.Prefixes.Add(url);
                listener.Start();

                var context = listener.GetContext();
                var requestUrl = context.Request.Url.ToString();
                var response = context.Response;
                if (pattern != null && !Regex.IsMatch(requestUrl, pattern))
                {
                    response.Abort();
                    return;
                }

                var stream = response.OutputStream;
                var writer = new StreamWriter(stream);
                writer.Write(output);
                writer.Close();
            });
        }
    }
}

Example.md

var baseUrl = EmbeddedHttpServer.GetLocalhostAddress();
var client = new SmartClient(new Uri(baseUrl));
var emptyResponse = "{}";
using(EmbeddedHttpServer.BasicHttpServer(baseUrl, emptyResponse))
{

}

var baseUrl = EmbeddedHttpServer.GetLocalhostAddress();
var client = new SmartClient(new Uri(baseUrl));
var emptyResponse = "{}";
var expectedPattern = $"\\?id=42$";
using(EmbeddedHttpServer.BasicHttpServer(baseUrl, emptyResponse, expectedPattern)
{

}