public void CreateViewModel_CreatesAndInitializesViewModelCorrectly(
[CombinatorialValues(null, "")] string title,
[CombinatorialValues(0, 1)] int key)
{
var container = Substitute.For <IContainer>();
var frameNavigationService = Substitute.For <IFrameNavigationService>();
container.Resolve <IFrameNavigationService>().ReturnsForAnyArgs(frameNavigationService);
var tabItem = new TabItem <ViewModelStub, int>(title, key, container);
var viewModel = tabItem.CreateViewModel();
Assert.NotNull(viewModel);
Assert.IsAssignableFrom <TabViewModel <ViewModelStub, int> >(viewModel);
Assert.Equal(frameNavigationService, viewModel.FrameNavigationService);
Assert.Equal(title, viewModel.Title);
Assert.Equal(key, viewModel.Key);
}