Hi I might be approaching this all wrong.But please help me to understand. I really want to TDD building wpf application using Moq. I would like to mock the viewmodel.

Application Show a list of contacts and when you double click on a contact it shows the contact.

Test Moq GetContactsCommand.Test it has been called. Test that you get a list of contacts.

Not sure how to mock the viewModel and it's commands can you correct me?

So I have started to do the following

    [Test]
    public void Should_be_able_to_mock_getContactsCommand_and_get_a_list_of_contacts()
    {
        //Arrange
        var expectedContacts = new ObservableCollection<ContactViewModel>
                                       {
                                           new ContactViewModel(new ContactModel
                                               {
                                                   FirstName = "Jo",
                                                   LastName = "Bloggs",
                                                   Email = "[email protected]"
                                               }),
                                               new ContactViewModel(new ContactModel
                                               {
                                                   FirstName = "Mary",
                                                   LastName = "Bloggs",
                                                   Email = "[email protected]"
                                               })

                                       };

        var mock = new Mock<IContactListViewModel>();
        mock.SetupGet(x => x.GetContactsCommand).Verifiable();
        mock.SetupGet(x => x.Contacts).Returns(expectedContacts);

        //Act
        //?

        //assert
        mock.VerifySet(x => x.Contacts, Times.AtLeastOnce());

        mock.Object.Contacts.Count.ShouldEqual(expectedContacts.Count);

    }

public interface IContactListViewModel
{
    ObservableCollection<ContactViewModel> Contacts { get; set; }
    ICommand GetContactsCommand{ get; }
}

public interface IContactModel
{
    string FirstName { get; set; }
    string LastName { get; set; }
    string Email { get; set; }
}

public class ContactModel : IContactModel
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string Email { get; set; }
}

public class ContactViewModel : ViewModelBase
{
    private readonly ContactModel _contactModel;

    public ContactViewModel(ContactModel contactModel)
    {
        _contactModel = contactModel;
    }

    public string FirstName
    {
        get { return _contactModel.FirstName; }
        set
        {
            _contactModel.FirstName = value;
            OnPropertyChanged("FirstName");
        }
    }

    public string LastName
    {
        get { return _contactModel.LastName; }
        set
        {
            _contactModel.LastName = value;
            OnPropertyChanged("LastName");
        }
    }

    public string Email
    {
        get { return _contactModel.Emai; }
        set
        {
            _contactModel.Email = value;
            OnPropertyChanged("Email");
        }
    }
}

public class ContactListViewModel : ViewModelBase, IContactListViewModel
{
    private ObservableCollection<ContactViewModel> _contacts;

    public ObservableCollection<ContactViewModel> Contacts
    {
        get { return _contacts; }
        set
        {
            _contacts = value;
            OnPropertyChanged("Contacts");
        }
    }



    private RelayCommand _getContactsCommand;
    public ICommand GetContactsCommand
    {
        get
        {
            return _getContactsCommand ?? (_getContactsCommand = new RelayCommand(x => GetContacts(), x => CanGetContacts));
        }
    }
    private static bool CanGetContacts
    {
        get { return true; }
    }

    private void GetContacts()
    {
        //pretend we are going to the service or db whatever
        Contacts = new ObservableCollection<ContactViewModel>
                                   {
                                      new ContactViewModel(new ContactModel
                                               {
                                                   FirstName = "Jo",
                                                   LastName = "Bloggs",
                                                   Email = "[email protected]"
                                               }),
                                               new ContactViewModel(new ContactModel
                                               {
                                                   FirstName = "Mary",
                                                   LastName = "Bloggs",
                                                   Email = "[email protected]"
                                               })

                                   };
    }
}