Test if ICommand was executed

My questions is the following: how can I test if an ICommand's Execute method was called on a mock object ?

I'm using the following code:

var mockOperandVM = new Mock<UCOperandViewModel> ();  
mockOperandVM.Setup (x => x.EditCommand).Returns (new RelayCommand<String> (x => { }));  

var toolbarTrayVM = new UCToolbarTrayViewModel (mockComponentsLocator.Object);
toolbarTrayVM.EditCommand.Execute ("Edit");
mockOperandVM.Verify (x => x.EditCommand.Execute ("Edit"), "EditCommand with 'Edit' parameter was not executed on the mock object.");

I have to specify here that I have an EditCommand ICommand on the UCOperandViewModel too and I want to test whether that ICommand gets executed when I call EditCommand.Execute on the too开发者_开发技巧lbarTrayVM.

I get an ArgumentException on the call to Verify. It says that "A matching constructor for the given arguments was not found on the mocked type.".

Thanks in advance.

Inject the service into the SUT - preferably using Constructor Injection. That would enable you to write unit test code like this:

var mock = new Mock<IService>();

var sut = new MyViewModel(mock.Object);
sut.SomeCommand.Execute(null);

mock.Verify(s => s.Foo());

This example uses Moq.