Test bubbling up messages

Tests/MessageSendTests.cs

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+using System;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+using Ooui;
+
+namespace Tests
+{
+    [TestClass]
+    public class MessageSendTests
+    {
+        [TestMethod]
+        public void SendTriggers ()
+        {
+            var b = new Button ();
+            var sendCount = 0;
+            b.MessageSent += m => {
+                if (m.Key == "test") sendCount++;
+            };
+            b.Send (Message.Event (b.Id, "test"));
+            Assert.AreEqual (1, sendCount);
+        }
+
+        [TestMethod]
+        public void ChildSendTriggers ()
+        {
+            var p = new Div ();
+            var b = new Button ();
+            p.AppendChild (b);
+            var sendCount = 0;
+            void HandleMessage (Message m) {
+                if (m.Key == "test") sendCount++;
+            };
+            p.MessageSent += HandleMessage;
+            b.Send (Message.Event (b.Id, "test"));
+            Assert.AreEqual (1, sendCount);
+        }
+
+        [TestMethod]
+        public void OldChildSendDoesntTrigger ()
+        {
+            var p = new Div ();
+            var b = new Button ();
+            p.AppendChild (b);
+            var sendCount = 0;
+            void HandleMessage (Message m) {
+                if (m.Key == "test") sendCount++;
+            };
+            p.MessageSent += HandleMessage;
+            b.Send (Message.Event (b.Id, "test"));
+            p.RemoveChild (b);
+            b.Send (Message.Event (b.Id, "test"));
+            Assert.AreEqual (1, sendCount);
+        }
+    }
+}