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POMVVM unit tests - message bus only works once
 

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  1. POMVVM unit tests - message bus only works once
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    <p>I am trying to write some unit tests against a view model using SimpleMvvmToolkit, and several of these tests require a message be sent to the message bus to fire events inside the view model. The problem is it appears that I can only 'use' the message bus once; the first test that sends a message passes, but the other two that send a message fail. But if I run each test individually, all three pass, and if I change the order, the first test, no matter which one it is, passes.</p> <p>Here is a sample of one of the tests.</p> <pre><code>[TestMethod] public void DeleteRequest() { // mock the driver transaction service var driverTransactionService = new Mock&lt;Services.IDriverTransactionService&gt;(); var viewModel = new ValidationRequestViewModel( driverTransactionService.Object); driverTransactionService.Setup(dts =&gt; dts.DeleteValidationRequest(It.IsAny&lt;Action&lt;int&gt;&gt;(), It.IsAny&lt;Action&lt;Exception&gt;&gt;(), It.IsAny&lt;int&gt;())) .Callback((Action&lt;int&gt; action, Action&lt;Exception&gt; ex, int id) =&gt; action.Invoke(requestId)); // make a validation request and add to the collection var validationRequest = new ValidationRequest... var collection = viewModel.ValidationRequestView.SourceCollection as ObservableCollection&lt;ValidationRequest&gt;; collection.Add(validationRequest); // delete the validation request; send the confirmation message as if // the user clicked yes viewModel.DeleteValidationRequest(validationRequest); MessageBus.Default.Notify( NotificationMessages.DeleteValidationRequestConfirmation, this, new NotificationEventArgs&lt;String&gt;(null, null)); // verify the service call was made driverTransactionService.Verify(dts =&gt; dts.DeleteValidationRequest(It.IsAny&lt;Action&lt;int&gt;&gt;(), It.IsAny&lt;Action&lt;Exception&gt;&gt;(), requestId)); } </code></pre> <p>So I am creating a mock of a service (which is a wrapper around a WCF service) and verifying that DeleteValidatonRequest on the service is being called. In this case, the message bus is needed because a confirmation dialog would normally pop up and send the DeleteValidationRequestConfirmation message if the user clicks OK.</p> <p>The test fails on the last line (Verify) and when I debug, the handler for the message in the view model never executes so it looks like the message is never actually sent. Again, this only fails if the test is <strong>not</strong> the first test to send a message to the bus. If it executes alone or is the first, the test passes.</p> <p>Any ideas? All of the tests are independent and do not share any properties or variables of the test class so I don't see how they could be stepping on each other.</p> <p>EDIT: I used reflection to call the protected methods on the view model that the messages would normally fire; this gets me the code coverage I want, it just doesn't verify that the view model is responding to messages correctly.</p> <p>EDIT 2: Crap, the same thing is happening with PropertyChanged events on the view model. The event handler only fires if the test is run independently or is the first.</p>
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