Remove unnecessary spinwaits.

Now we don't have an extra Thread to deal with, this is simpler.

Frank.Tests/Plugins/HttpListener/HttpListenerServerWrapper.cs

@@ -2,10 +2,8 @@
 using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.Linq;
-using System.Threading;
 using System.Threading.Tasks;
 using FluentAssertions;
-using FluentAssertions.Extensions;
 using Frank.API.WebDevelopers.DTO;
 using Frank.Plugins.HttpListener;
 
@@ -39,11 +37,7 @@ public void AssertHeadersCaseInsensitivelyContain(string expectedKey, string exp
                     expectedValue));
         }
 
-        private Request FirstRequest()
-        {
-            WaitForRequest();
-            return _requests.First();
-        }
+        private Request FirstRequest() => _requests.First();
 
         private static string CapitalizeFirstLetter(string expectedKey)
         {
@@ -87,7 +81,6 @@ public void Start()
         }
 
         public string Host => "http://127.0.0.1:8020";
-        public void WaitForRequest() => SpinWait.SpinUntil(() => !_requests.IsEmpty, (int) 30.Seconds().TotalMilliseconds);
 
         public void Stop()
         {

Frank/Internals/TestHarness.cs

@@ -1,5 +1,4 @@
 using System;
-using System.Threading;
 using Frank.API.PluginDevelopers;
 using Frank.API.WebDevelopers;
 using Frank.API.WebDevelopers.DTO;
@@ -56,7 +55,6 @@ public void RegisterRequestHandler(Action<Request, IResponseBuffer> processReque
 
         public Response Execute(Request request)
         {
-            SpinWait.SpinUntil(() => _processRequest != null);
             request.Path = "/";
             var buffer = new TestResponseBuffer();
             _processRequest(request, buffer);

Frank/Internals/WebApplication.cs

@@ -1,7 +1,6 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Threading.Tasks;
 using Frank.API.PluginDevelopers;
 using Frank.API.WebDevelopers;
 using Frank.API.WebDevelopers.DTO;