PracticeCalendar/PracticeCalendar.UnitTests/Integration/CustomWebApplicationFactory.cs

using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc.Testing;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using PracticeCalendar.Infrastructure.Persistence;

namespace PracticeCalendar.UnitTests.Integration
{
    public class CustomWebApplicationFactory : WebApplicationFactory<Program>
    {
        protected override void ConfigureWebHost(IWebHostBuilder builder)
        {
            builder.ConfigureAppConfiguration(configurationBuilder =>
            {
                var integrationConfig = new ConfigurationBuilder()
                    .AddJsonFile("appsettings.json")
                    .AddEnvironmentVariables()
                    .Build();

                configurationBuilder.AddConfiguration(integrationConfig);
            });

            builder.ConfigureServices((builder, services) =>
            {
                services.Remove<DbContextOptions<ApplicationDbContext>>();
                services.AddDbContext<ApplicationDbContext>(options =>
                    options.UseInMemoryDatabase("InMemoryDbForTesting")
                );
            });
        }
    }
}