public void Edit_WhenProductDoesNotExist_ReturnNotFound()
{
Product obj = null;
var unitOfWork = new Mock <IUnitOfWork>();
unitOfWork.Setup(i => i.ProductRepo.GetProductById(It.IsAny <int>())).Returns(obj);
var controller = new DummyController(unitOfWork.Object);
controller.Edit(1).Should().BeOfType(typeof(HttpNotFoundResult));
}