Index: test/Plugins/Wti/Wti.Data.Test/WtiProjectTest.cs
===================================================================
diff -u -ra4ac4e49268888b50f6f9606a1b8dd8225e1b24f -rfdc45df8cf7ca4dba62fb6e96b5cf8ef7ab73ade
--- test/Plugins/Wti/Wti.Data.Test/WtiProjectTest.cs	(.../WtiProjectTest.cs)	(revision a4ac4e49268888b50f6f9606a1b8dd8225e1b24f)
+++ test/Plugins/Wti/Wti.Data.Test/WtiProjectTest.cs	(.../WtiProjectTest.cs)	(revision fdc45df8cf7ca4dba62fb6e96b5cf8ef7ab73ade)
@@ -1,7 +1,12 @@
-using DelftTools.Utils;
+using System;
 
+using DelftTools.Shell.Core;
+using DelftTools.Utils;
+
 using NUnit.Framework;
 
+using Rhino.Mocks;
+
 namespace Wti.Data.Test
 {
     [TestFixture]
@@ -15,7 +20,48 @@
 
             // assert
             Assert.IsInstanceOf<INameable>(project);
+            Assert.IsInstanceOf<IObservable>(project);
             Assert.AreEqual("WTI 2017 project", project.Name);
         }
+
+        [Test]
+        public void NotifyObservers_ObserverAttachedToProject_ObserverIsNotified()
+        {
+            // setup
+            var mocks = new MockRepository();
+            var observer = mocks.StrictMock<IObserver>();
+            observer.Expect(o => o.UpdateObserver());
+            mocks.ReplayAll();
+
+            var project = new WtiProject();
+            project.Attach(observer);
+
+            // call
+            project.NotifyObservers();
+
+            // assert
+            mocks.VerifyAll();
+        }
+
+        [Test]
+        public void NotifyObservers_ObserverHasBeenDetached_ObserverShouldNotBeNotified()
+        {
+            // setup
+            var mocks = new MockRepository();
+            var observer = mocks.StrictMock<IObserver>();
+            mocks.ReplayAll();
+
+            var project = new WtiProject();
+            project.Attach(observer);
+            project.Detach(observer);
+
+            // call
+            project.NotifyObservers();
+
+            // assert
+            mocks.VerifyAll(); // Expect no calls on observer
+        }
+        
+        
     }
 }
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