littleshop/LittleShop.Tests/Infrastructure/TestWebApplicationFactory.cs

using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc.Testing;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using LittleShop.Data;
using System.Linq;

namespace LittleShop.Tests.Infrastructure;

public class TestWebApplicationFactory : WebApplicationFactory<Program>
{
    protected override void ConfigureWebHost(IWebHostBuilder builder)
    {
        builder.ConfigureServices(services =>
        {
            // Remove the existing DbContext registration
            var descriptor = services.SingleOrDefault(
                d => d.ServiceType == typeof(DbContextOptions<LittleShopContext>));
            
            if (descriptor != null)
            {
                services.Remove(descriptor);
            }

            // Add in-memory database for testing
            services.AddDbContext<LittleShopContext>(options =>
            {
                options.UseInMemoryDatabase("InMemoryDbForTesting");
            });

            // Build service provider
            var sp = services.BuildServiceProvider();

            // Create scope for database initialization
            using (var scope = sp.CreateScope())
            {
                var scopedServices = scope.ServiceProvider;
                var db = scopedServices.GetRequiredService<LittleShopContext>();
                var logger = scopedServices.GetRequiredService<ILogger<TestWebApplicationFactory>>();

                // Ensure database is created
                db.Database.EnsureCreated();

                try
                {
                    // Seed test data if needed
                    SeedTestData(db);
                }
                catch (Exception ex)
                {
                    logger.LogError(ex, "An error occurred seeding the database with test data.");
                }
            }
        });

        builder.UseEnvironment("Testing");
    }

    private static void SeedTestData(LittleShopContext context)
    {
        // Seed test data will be added as needed for specific tests
        context.SaveChanges();
    }
}