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POIntegration Testing a ViewModel that calls WCF Services asynchronously in a WPF MVVM Application
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  1. POIntegration Testing a ViewModel that calls WCF Services asynchronously in a WPF MVVM Application
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    copied!<p>The Silverlight Toolkit contains Unit Testing Functionality that allows to test classes such as the ViewModels in a MVVM application that invoke remote Services asynchronously.</p> <p>I would like to be able to perform my ViewModel Integration Tests against the actual services instead of mocked instances. </p> <p>Is there any support for asynchronous Unit/Integration Testing for WPF Applications?</p> <p><strong>Update:</strong></p> <p>At the end of the day my solution combined the suggestions of ktutnik and Alex Paven. I wrote a tiny helper class that adds some syntactic sugar:</p> <pre><code>public static class AsyncMethod { public delegate void AsyncMethodCallback(AsyncMethodContext ctx); public static void Call(AsyncMethodCallback cb) { // create the sync object and make it available via TLS using (var syncObject = new AutoResetEvent(false)) { // call the decorated method cb(new AsyncMethodContext(syncObject)); } } } /// &lt;summary&gt;Asnc Method Callback Synchronization Context&lt;/summary&gt; public class AsyncMethodContext { public AsyncMethodContext(EventWaitHandle syncObject) { this.syncObject = syncObject; } private readonly EventWaitHandle syncObject; /// &lt;summary&gt; /// Waits for completion. /// &lt;/summary&gt; public void WaitForCompletion() { syncObject.WaitOne(); } /// &lt;summary&gt; /// Signals the current operation as complete /// &lt;/summary&gt; public void Complete() { syncObject.Set(); } } </code></pre> <p>Here's a sample test case combined with the utilization of the Microsoft Rx Extensions:</p> <pre><code>[TestMethod] public void TestGuestLogin() { AsyncMethod.Call((ctx) =&gt; { var vm = ServiceLocator.Get&lt;LoginDialogViewModel&gt;(); // setup VM data vm.Username = "guest"; vm.Password = "guest"; vm.AutoLogin = false; GenericInfoEventArgs&lt;LoginDialogViewModel.LoginRequestResult&gt; loginResult = null; // pre-flight check Assert.IsTrue(vm.LoginCmd.CanExecute(null)); // create Observable for the VM's LoginRequestComplete event var loginEvent = Observable.FromEvent&lt;GenericInfoEventArgs&lt;LoginDialogViewModel.LoginRequestResult&gt;&gt;(vm, "LoginRequestComplete").Do((e) =&gt; { Debug.WriteLine(e.ToString()); }); // subscribe to it var loginEventSubscription = loginEvent.Subscribe((e) =&gt; { loginResult = e.EventArgs; // test complete ctx.Complete(); }); // set things in motion using (loginEventSubscription) { vm.LoginCmd.Execute(null); ctx.WaitForCompletion(); Assert.IsTrue(loginResult.Info.Success, "Login was not successful"); } }); } </code></pre>
 

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