public async Task CreateCartItem_AddsNewProductToCartItemsTable()
{
//Arrange
var myDbContextMoq = new DbContextMock <ShoppingCartContext>(myDummyOptions);
//Create list of CartItems that contains only two Products
myDbContextMoq.CreateDbSetMock(x => x.CartItems, new[]
{
new CartItem {
ProductId = 1, Price = 3, Quantity = 2
},
new CartItem {
ProductId = 2, Price = 2, Quantity = 5
}
});
//We want to add third product to our list of CartItems
//Since CreateCartItem() method accepts type CartItemDTO we use that type here for our new CartItem
CartItemDTO testDataDTO = new CartItemDTO()
{
ProductId = 3,
Price = 21,
Quantity = 1
};
CartItemService service = new CartItemService(myDbContextMoq.Object);
//Act
await service.CreateCartItem(testDataDTO);//call CreateCartItem() function and pass the testDataDTO
//Assert
//The size of the CartItems list increases to 3 because CreateCartItem() method added testDataDTO
Assert.Equal(3, myDbContextMoq.Object.CartItems.Count());
}