Implement product multi-buys and variants system
Major restructuring of product variations: - Renamed ProductVariation to ProductMultiBuy for quantity-based pricing (e.g., "3 for £25") - Added new ProductVariant model for string-based options (colors, flavors) - Complete separation of multi-buy pricing from variant selection Features implemented: - Multi-buy deals with automatic price-per-unit calculation - Product variants for colors/flavors/sizes with stock tracking - TeleBot checkout supports both multi-buys and variant selection - Shopping cart correctly calculates multi-buy bundle prices - Order system tracks selected variants and multi-buy choices - Real-time bot activity monitoring with SignalR - Public bot directory page with QR codes for Telegram launch - Admin dashboard shows multi-buy and variant metrics Technical changes: - Updated all DTOs, services, and controllers - Fixed cart total calculation for multi-buy bundles - Comprehensive test coverage for new functionality - All existing tests passing with new features Database changes: - Migrated ProductVariations to ProductMultiBuys - Added ProductVariants table - Updated OrderItems to track variants 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
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LittleShop.Tests/Unit/ProductMultiBuyServiceTests.cs
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252
LittleShop.Tests/Unit/ProductMultiBuyServiceTests.cs
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using FluentAssertions;
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using LittleShop.Data;
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using LittleShop.DTOs;
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using LittleShop.Models;
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using LittleShop.Services;
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using LittleShop.Enums;
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using Microsoft.EntityFrameworkCore;
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using Microsoft.AspNetCore.Hosting;
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using Moq;
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using Xunit;
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namespace LittleShop.Tests.Unit;
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public class ProductMultiBuyServiceTests : IDisposable
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{
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private readonly LittleShopContext _context;
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private readonly IProductService _productService;
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private readonly Mock<IWebHostEnvironment> _mockEnvironment;
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public ProductMultiBuyServiceTests()
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{
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var options = new DbContextOptionsBuilder<LittleShopContext>()
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.UseInMemoryDatabase(databaseName: Guid.NewGuid().ToString())
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.Options;
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_context = new LittleShopContext(options);
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_mockEnvironment = new Mock<IWebHostEnvironment>();
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_mockEnvironment.Setup(e => e.WebRootPath).Returns("/test/wwwroot");
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_productService = new ProductService(_context, _mockEnvironment.Object);
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}
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[Fact]
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public async Task CreateProductMultiBuy_ShouldCreateSuccessfully()
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{
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// Arrange
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var product = await CreateTestProduct();
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var createDto = new CreateProductMultiBuyDto
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{
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ProductId = product.Id,
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Name = "3 for £25",
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Description = "Save £5 when you buy 3",
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Quantity = 3,
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Price = 25.00m
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};
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// Act
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var result = await _productService.CreateProductMultiBuyAsync(createDto);
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// Assert
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result.Should().NotBeNull();
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result.Name.Should().Be("3 for £25");
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result.Quantity.Should().Be(3);
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result.Price.Should().Be(25.00m);
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result.PricePerUnit.Should().BeApproximately(8.33m, 0.01m);
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}
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[Fact]
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public async Task CreateProductMultiBuy_DuplicateQuantity_ShouldThrow()
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{
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// Arrange
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var product = await CreateTestProduct();
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// Create first multi-buy
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await _productService.CreateProductMultiBuyAsync(new CreateProductMultiBuyDto
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{
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ProductId = product.Id,
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Name = "Twin Pack",
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Quantity = 2,
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Price = 19.00m
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});
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// Try to create duplicate quantity
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var duplicateDto = new CreateProductMultiBuyDto
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{
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ProductId = product.Id,
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Name = "Double Deal",
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Quantity = 2, // Same quantity
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Price = 18.00m
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};
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// Act & Assert
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var act = async () => await _productService.CreateProductMultiBuyAsync(duplicateDto);
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await act.Should().ThrowAsync<ArgumentException>()
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.WithMessage("*already exists*");
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}
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[Fact]
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public async Task GetProductWithMultiBuys_ShouldReturnAllMultiBuys()
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{
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// Arrange
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var product = await CreateTestProduct();
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// Create multiple multi-buys
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await _productService.CreateProductMultiBuyAsync(new CreateProductMultiBuyDto
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{
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ProductId = product.Id,
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Name = "Twin Pack",
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Quantity = 2,
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Price = 19.00m
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});
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await _productService.CreateProductMultiBuyAsync(new CreateProductMultiBuyDto
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{
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ProductId = product.Id,
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Name = "Triple Pack",
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Quantity = 3,
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Price = 25.00m
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});
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// Act
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var result = await _productService.GetProductByIdAsync(product.Id);
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// Assert
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result.Should().NotBeNull();
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result!.MultiBuys.Should().HaveCount(2);
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result.MultiBuys.Should().Contain(mb => mb.Name == "Twin Pack");
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result.MultiBuys.Should().Contain(mb => mb.Name == "Triple Pack");
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result.MultiBuys.Should().BeInAscendingOrder(mb => mb.Quantity);
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}
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[Fact]
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public async Task UpdateProductMultiBuy_ShouldUpdateSuccessfully()
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{
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// Arrange
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var product = await CreateTestProduct();
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var multiBuy = await _productService.CreateProductMultiBuyAsync(new CreateProductMultiBuyDto
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{
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ProductId = product.Id,
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Name = "Original Name",
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Quantity = 2,
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Price = 20.00m
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});
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var updateDto = new UpdateProductMultiBuyDto
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{
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Name = "Updated Name",
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Description = "New description",
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Price = 18.00m,
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SortOrder = 10,
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IsActive = false
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};
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// Act
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var success = await _productService.UpdateProductMultiBuyAsync(multiBuy.Id, updateDto);
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// Assert
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success.Should().BeTrue();
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// Get the updated multi-buy to verify changes
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var updated = await _productService.GetProductMultiBuyByIdAsync(multiBuy.Id);
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updated.Should().NotBeNull();
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updated!.Name.Should().Be("Updated Name");
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updated.Description.Should().Be("New description");
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updated.Price.Should().Be(18.00m);
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updated.PricePerUnit.Should().Be(9.00m);
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updated.SortOrder.Should().Be(10);
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updated.IsActive.Should().BeFalse();
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}
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[Fact]
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public async Task DeleteProductMultiBuy_ShouldSoftDelete()
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{
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// Arrange
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var product = await CreateTestProduct();
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var multiBuy = await _productService.CreateProductMultiBuyAsync(new CreateProductMultiBuyDto
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{
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ProductId = product.Id,
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Name = "To Delete",
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Quantity = 2,
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Price = 20.00m
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});
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// Act
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await _productService.DeleteProductMultiBuyAsync(multiBuy.Id);
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// Assert
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var deletedMultiBuy = await _context.ProductMultiBuys
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.IgnoreQueryFilters()
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.FirstOrDefaultAsync(mb => mb.Id == multiBuy.Id);
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deletedMultiBuy.Should().NotBeNull();
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deletedMultiBuy!.IsActive.Should().BeFalse();
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}
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[Fact]
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public async Task PricePerUnit_ShouldCalculateCorrectly()
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{
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// Arrange & Act
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var product = await CreateTestProduct();
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var singleItem = await _productService.CreateProductMultiBuyAsync(new CreateProductMultiBuyDto
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{
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ProductId = product.Id,
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Name = "Single",
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Quantity = 1,
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Price = 10.00m
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});
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var twinPack = await _productService.CreateProductMultiBuyAsync(new CreateProductMultiBuyDto
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{
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ProductId = product.Id,
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Name = "Twin Pack",
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Quantity = 2,
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Price = 19.00m
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});
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var triplePack = await _productService.CreateProductMultiBuyAsync(new CreateProductMultiBuyDto
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{
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ProductId = product.Id,
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Name = "Triple Pack",
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Quantity = 3,
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Price = 25.00m
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});
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// Assert
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singleItem.PricePerUnit.Should().Be(10.00m);
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twinPack.PricePerUnit.Should().Be(9.50m);
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triplePack.PricePerUnit.Should().BeApproximately(8.33m, 0.01m);
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}
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private async Task<Product> CreateTestProduct()
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{
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var category = new Category
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{
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Id = Guid.NewGuid(),
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Name = "Test Category",
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IsActive = true
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};
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_context.Categories.Add(category);
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var product = new Product
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{
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Id = Guid.NewGuid(),
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Name = "Test Product",
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Price = 10.00m,
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CategoryId = category.Id,
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IsActive = true,
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Weight = 1.0m,
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WeightUnit = ProductWeightUnit.Kilograms
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};
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_context.Products.Add(product);
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await _context.SaveChangesAsync();
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return product;
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}
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public void Dispose()
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{
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_context.Dispose();
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}
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}
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