Added test for websocket (echo) #5

Author: FlorianRappl

AngleSharp.Io.Tests/Network/WebSocketTests.cs

@@ -1,9 +1,46 @@
 namespace AngleSharp.Io.Tests.Network
 {
+    using AngleSharp.Dom.Events;
+    using AngleSharp.Io.Dom;
+    using FluentAssertions;
     using NUnit.Framework;
+    using System;
+    using System.Collections.Generic;
+    using System.Threading.Tasks;
 
     [TestFixture]
     public class WebSocketTests
     {
+        [Test]
+        public async Task ConnectToWebSocketEcho()
+        {
+            if (Helper.IsNetworkAvailable())
+            {
+                // ARRANGE
+                var message = "foo";
+                var haserror = false;
+                var messages = new List<String>();
+                var closed = new TaskCompletionSource<Boolean>();
+                var document = await BrowsingContext.New().OpenNewAsync("https://www.websocket.org/echo.html");
+                var ws = new WebSocket(document.DefaultView, "wss://echo.websocket.org");
+
+                // ACT
+                ws.Opened += (s, ev) => ws.Send(message);
+                ws.Message += (s, ev) =>
+                {
+                    var msg = ev as MessageEvent;
+                    messages.Add(msg.Data.ToString());
+                    ws.Close();
+                };
+                ws.Closed += (s, ev) => closed.SetResult(true);
+                ws.Error += (s, ev) => haserror = true;
+                await closed.Task;
+                
+                // ASSERT
+                haserror.Should().BeFalse();
+                messages.Count.Should().Be(1);
+                messages[0].Should().Be(message);
+            }
+        }
     }
 }