public async void When_CartLine_Is_Added_Expect_Created_StatusCode_And_Added_Entity()
{
//Arrange
var product = _fixture.GenerateProduct();
var content = new StringContent(JsonConvert.SerializeObject(new AddCartLineDTO()
{
Amount = 10, ProductId = product.Id
}), Encoding.UTF8, "application/json");
//Act
var response = await _fixture.Client.PostAsync("api/cart", content);
//Assert
Assert.Equal(HttpStatusCode.Created, response.StatusCode);
var result = await response.Content.ReadAsStringAsync();
var viewModel = JsonConvert.DeserializeObject <CartLineViewModel>(result);
Assert.NotEqual(0, viewModel.Id);
var entity = await _fixture.Context.CartLines.FindAsync(viewModel.Id);
Assert.NotNull(entity);
Assert.Equal(10, entity.Amount);
}