public void VerifyThatDragWorks()
{
var vm = new ProductTreeViewModel(this.option, this.session.Object, null, this.panelNavigationService.Object, null, null);
var draginfo = new Mock <IDragInfo>();
var dragSource = new Mock <IDragSource>();
draginfo.Setup(x => x.Payload).Returns(dragSource.Object);
vm.StartDrag(draginfo.Object);
dragSource.Verify(x => x.StartDrag(draginfo.Object));
}
