public void TestFor_StockAdding() { //Arrange Products Product = new Products() { Id = 1, ProductName = "Mobile", SubCategoryId = "2", Price = 400, BuyerId = 2, CategoryId = "2" }; List <Products> productList = new List <Products>(); productList.Add(Product); Seller seller = new Seller() { SellerId = 10, SellerName = "Mary", Email = "*****@*****.**", Password = "******", PostelAdress = "Delhi", GSTIN = "ABVC123XY763BG5", BankDetails = "SBI" }; var NumberOfStock = 1; //Action var IsAddedStock = _Sellerservice.AddStock(productList, seller, NumberOfStock); //Assert Assert.True(IsAddedStock); }