How can I test a RoutedUICommand?

Question

I have an application that I am building unit tests for. For certain operations, I use ApplicationCommands (eg. ApplicationCommands.New). Is there an easy way to call CanExecute and Execute on a routed UI command in the unit test? I thought about implementing a mock IInputElement, but that seems like a lot of work. Is there a better way?

[TestMethod]
public void NewDocument()
{
     Assert.IsTrue(ApplicationCommands.New.CanExecute(null, mockTarget));
     ApplicationCommands.New.Execute(null, mockTarget);
     Assert.IsTrue(workspace.OpenDocuments.Count == 1);
}

It looks like this is very similar to this question why-does-my-command-canexecute-always-return-false-in-unit-test? Does anyone know of a way to execute the routed ui command without the ui actually being there?

I have the command and command binding, but I don't know how to create the command source and command target.

Answer 1

You should be testing the actual ICommand class that responds to the routed command. If this routed command is implemented just by event handlers in one of you code-behind files, then I'd suggest pulling an ICommand out of those and testing that.

Testing that the command is routed properly is not a unit test you should be writing. Instead that should be an integration test that could be done with coded UI testing via Visual Studio (or some other GUI test framework).