public void CheckIfItAddsToCart() { //Arrange var initialcartSize = Cart.GetAllCart().Count; var idOfLastProduct = Product.GetAllProduct().LastOrDefault().ProductId; //Act Cart.AddCart(idOfLastProduct, 4); var actualSize = Cart.GetAllCart().Count; var expected = initialcartSize + 1; //Assert Assert.That(expected, Is.EqualTo(actualSize)); }