server/test/IntegrationTestCommon/Factories/WebApplicationFactoryBase.cs

using AspNetCoreRateLimit;
using Bit.Core.Repositories;
using Bit.Core.Services;
using Bit.Infrastructure.EntityFramework.Repositories;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc.Testing;
using Microsoft.AspNetCore.TestHost;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;

namespace Bit.IntegrationTestCommon.Factories
{
    public static class FactoryConstants
    {
        public const string DefaultDatabaseName = "test_database";
        public const string WhitelistedIp = "1.1.1.1";
    }

    public abstract class WebApplicationFactoryBase<T> : WebApplicationFactory<T>
        where T : class
    {
        /// <summary>
        /// The database name to use for this instance of the factory. By default it will use a shared database name so all instances will connect to the same database during it's lifetime.
        /// </summary>
        /// <remarks>
        /// This will need to be set BEFORE using the <c>Server</c> property
        /// </remarks>
        public string DatabaseName { get; set; } = FactoryConstants.DefaultDatabaseName;

        /// <summary>
        /// Configure the web host to use an EF in memory database
        /// </summary>
        protected override void ConfigureWebHost(IWebHostBuilder builder)
        {
            builder.ConfigureAppConfiguration(c =>
            {
                c.AddInMemoryCollection(new Dictionary<string, string>
                {
                    // Manually insert a EF provider so that ConfigureServices will add EF repositories but we will override
                    // DbContextOptions to use an in memory database
                    { "globalSettings:databaseProvider", "postgres" },
                    { "globalSettings:postgreSql:connectionString", "Host=localhost;Username=test;Password=test;Database=test" },
                });
            });

            builder.ConfigureTestServices(services =>
            {
                var dbContextOptions = services.First(sd => sd.ServiceType == typeof(DbContextOptions<DatabaseContext>));
                services.Remove(dbContextOptions);
                services.AddScoped(_ =>
                {
                    return new DbContextOptionsBuilder<DatabaseContext>()
                        .UseInMemoryDatabase(DatabaseName)
                        .Options;
                });

                // QUESTION: The normal licensing service should run fine on developer machines but not in CI
                // should we have a fork here to leave the normal service for developers?
                // TODO: Eventually add the license file to CI
                var licensingService = services.First(sd => sd.ServiceType == typeof(ILicensingService));
                services.Remove(licensingService);
                services.AddSingleton<ILicensingService, NoopLicensingService>();

                // FUTURE CONSIDERATION: Add way to run this self hosted/cloud, for now it is cloud only
                var pushRegistrationService = services.First(sd => sd.ServiceType == typeof(IPushRegistrationService));
                services.Remove(pushRegistrationService);
                services.AddSingleton<IPushRegistrationService, NoopPushRegistrationService>();

                // Even though we are cloud we currently set this up as cloud, we can use the EF/selfhosted service
                // instead of using Noop for this service
                // TODO: Install and use azurite in CI pipeline
                var eventWriteService = services.First(sd => sd.ServiceType == typeof(IEventWriteService));
                services.Remove(eventWriteService);
                services.AddSingleton<IEventWriteService, RepositoryEventWriteService>();

                var eventRepositoryService = services.First(sd => sd.ServiceType == typeof(IEventRepository));
                services.Remove(eventRepositoryService);
                services.AddSingleton<IEventRepository, EventRepository>();

                // Our Rate limiter works so well that it begins to fail tests unless we carve out
                // one whitelisted ip. We should still test the rate limiter though and they should change the Ip 
                // to something that is NOT whitelisted
                services.Configure<IpRateLimitOptions>(options =>
                {
                    options.IpWhitelist = new List<string>
                    {
                        FactoryConstants.WhitelistedIp,
                    };
                });
            });
        }

        public DatabaseContext GetDatabaseContext()
        {
            var scope = Services.CreateScope();
            return scope.ServiceProvider.GetRequiredService<DatabaseContext>();
        }
    }
}