public void Down_Selects_Selects_First_MenuItem_When_No_Selection()
{
var target = new DefaultMenuInteractionHandler(true);
var contextMenu = Mock.Of <IMenu>(x => x.MoveSelection(NavigationDirection.Down, true) == true);
var e = new KeyEventArgs {
Key = Key.Down, Source = contextMenu
};
target.Attach(contextMenu);
target.KeyDown(contextMenu, e);
Mock.Get(contextMenu).Verify(x => x.MoveSelection(NavigationDirection.Down, true));
Assert.True(e.Handled);
}