--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SilverlightValidation/SilverlightValidation.Tests/ViewModels/UserViewModel_Commands.cs	Sun May 06 20:37:32 2012 +0100
@@ -0,0 +1,96 @@
+using GalaSoft.MvvmLight.Messaging;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using SilverlightValidation.Messages;
+using SilverlightValidation.Tests.Helpers;
+
+namespace SilverlightValidation.Tests.ViewModels
+{
+    [TestClass]
+    public class UserViewModel_Commands
+    {
+        [TestMethod]
+        public void WhenNewViewModel_ThenOkCommandIsExecutable()
+        {
+            // arrange
+            var vm = Helper.CreateDefaultUserViewModel();
+
+            // assert
+            Assert.IsTrue(vm.OkCommand.CanExecute(null));
+        }
+
+        [TestMethod]
+        public void WhenNewViewModel_WithOkExecuted_ThenShouldNotRaiseEvent()
+        {
+            // arrange
+            var vm = Helper.CreateDefaultUserViewModel();
+            bool hasMessage = false;
+            Messenger.Default.Register<UserViewResponseMessage>(this, message => { hasMessage = true; });
+
+            // act
+            vm.OkCommand.Execute(null);
+
+            // assert
+            Assert.IsFalse(hasMessage);
+        }
+
+        [TestMethod]
+        public void WhenNewViewModel_WithOkExecutedAndUsernameUpdatedWithInvalidData_ThenShouldNotRaiseEvent()
+        {
+            // arrange
+            var vm = Helper.CreateDefaultUserViewModel();
+            bool hasMessage = false;
+            Messenger.Default.Register<UserViewResponseMessage>(this, message => { hasMessage = true; });
+
+            // act
+            var shortData = "a";
+            vm.Username = shortData;
+            vm.OkCommand.Execute(null);
+
+            // assert
+            Assert.IsFalse(hasMessage);
+        }
+
+        [TestMethod]
+        public void WhenNewViewModel_WithOkExecutedAndUsernameUpdated_ThenShouldRaiseEvent()
+        {
+            // arrange
+            var vm = Helper.CreateValidUserViewModel();
+            bool hasMessage = false;
+            Messenger.Default.Register<UserViewResponseMessage>(this, message => { hasMessage = true; });
+
+            // act
+            vm.Username = "updated";
+            vm.OkCommand.Execute(null);
+
+            // assert
+            Assert.IsTrue(vm.IsChanged);
+            Assert.IsTrue(hasMessage);
+        }
+
+        [TestMethod]
+        public void WhenNewViewModel_ThenCancelCommandIsExecutable()
+        {
+            // arrange
+            var vm = Helper.CreateDefaultUserViewModel();
+
+            // assert
+            Assert.IsTrue(vm.CancelCommand.CanExecute(null));
+        }
+
+        [TestMethod]
+        public void WhenNewViewModel_WithCancelExecuted_ThenShouldRaiseEvent()
+        {
+            // arrange
+            var vm = Helper.CreateDefaultUserViewModel();
+            bool hasMessage = false;
+            Messenger.Default.Register<UserViewResponseMessage>(this, message => { hasMessage = true; });
+
+            // act
+            vm.CancelCommand.Execute(null);
+
+            // assert
+            Assert.IsTrue(hasMessage);
+        }
+        
+    }
+}