tuitio/test/UnitTests/Tuitio.Application.Tests/Fixtures/DependencyInjectionFixture.cs

using MediatR;
using MediatR.Pipeline;
using Microsoft.Data.Sqlite;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using System.Data.Common;
using Tuitio.Domain.Data.DbContexts;
using Xunit;

namespace Tuitio.Application.Tests.Fixtures
{
    public class DependencyInjectionFixture : IAsyncLifetime
    {
        private readonly Guid _prefix;
        private readonly List<SqliteConnection> _connections;
        public readonly IServiceProvider ServiceProvider;

        public DependencyInjectionFixture()
        {
            _prefix = Guid.NewGuid();
            _connections = new List<SqliteConnection>();
            ServiceProvider = BuildServiceProvider();
        }

        public async Task DisposeAsync()
        {
            foreach (var con in _connections)
                await con.DisposeAsync();
        }

        public async Task InitializeAsync()
        {
            await PrepareDbAsync();
            SeedData();
        }

        private IServiceProvider BuildServiceProvider()
        {
            var configurationBuilder = new ConfigurationBuilder()
                .SetBasePath(Directory.GetCurrentDirectory())
                .AddJsonFile("appsettings.tuitio.json", optional: true, reloadOnChange: false);
            var configuration = configurationBuilder.Build();

            var services = new ServiceCollection();
            services.AddSingleton<IConfiguration>(configuration);
            services.AddLogging(builder =>
            {
                builder.SetMinimumLevel(LogLevel.Warning);
                builder.AddFilter("Microsoft.*", LogLevel.Warning);
            });

            // MediatR
            services.AddMediatR(typeof(Application.CommandHandlers.AccountLoginHandler).Assembly);
            services.AddScoped(typeof(IPipelineBehavior<,>), typeof(RequestPreProcessorBehavior<,>));

            // AutoMapper
            services.AddAutoMapper(typeof(Application.Mappings.MappingProfile).Assembly);

            services.AddDbContext<TuitioDbContext>(options =>
            {
                options.UseSqlite(GetOrAddInMemoryDatabase("TuitioDbContext"));
                options.EnableSensitiveDataLogging();
                options.EnableDetailedErrors();
            });

            services.AddApplicationServices();

            var provider = services.BuildServiceProvider();
            return provider;
        }

        private DbConnection GetOrAddInMemoryDatabase(string code)
        {
            var connection = new SqliteConnection($"Data Source={_prefix}{code};Mode=Memory;Cache=shared");
            _connections.Add(connection);
            connection.Open();
            return connection;
        }

        private async Task PrepareDbAsync()
        {
            var result = await ServiceProvider.GetRequiredService<TuitioDbContext>().Database.EnsureCreatedAsync();
            if (!result) throw new Exception("TuitioDbContext exists");

            var script = await File.ReadAllTextAsync("seed.sql");
            await ServiceProvider.GetRequiredService<TuitioDbContext>().Database.ExecuteSqlRawAsync(script);
        }

        private void SeedData()
        {
            using var dbContext = ServiceProvider.GetRequiredService<TuitioDbContext>();

            dbContext.UserStatuses.AddRange(new Domain.Entities.UserStatus[]
            {
                new Domain.Entities.UserStatus()
                {
                    StatusId = 1,
                    StatusCode = "ACTIVE",
                    StatusName = "Active"
                },
                new Domain.Entities.UserStatus()
                {
                    StatusId = 2,
                    StatusCode = "INACTIVE",
                    StatusName = "Inactive"
                },
                new Domain.Entities.UserStatus()
                {
                    StatusId = 3,
                    StatusCode = "BLOCKED",
                    StatusName = "Blocked"
                }
            });

            dbContext.SaveChanges();
        }
    }
}