EnvelopeGenerator/EnvelopeGenerator.Tests.Application/Fake.cs

using Bogus;
using Bogus.DataSets;
using EnvelopeGenerator.Application;
using EnvelopeGenerator.Application.Receivers.Commands;
using EnvelopeGenerator.Infrastructure;
using MediatR;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;

namespace EnvelopeGenerator.Tests.Application;

public class Fake
{
    public static readonly Faker Provider = new("de");

    public static Host CreateHost() => Microsoft.Extensions.Hosting.Host.CreateDefaultBuilder()
        .ConfigureAppConfiguration((context, config) =>
        {
            // add appsettings.json
            config.SetBasePath(Directory.GetCurrentDirectory());
            config.AddJsonFile("appsettings.json", optional: false, reloadOnChange: true);
        })
        .ConfigureServices((context, services) =>
        {
            IConfiguration configuration = context.Configuration;

            // add Application and Infrastructure services
#pragma warning disable CS0618
            services.AddEnvelopeGeneratorServices(configuration);
            services.AddEnvelopeGeneratorInfrastructureServices(
                (sp, options) => options.UseInMemoryDatabase("EnvelopeGeneratorTestDb"),
                context.Configuration
            );
#pragma warning restore CS0618
        })
        .Build()
        .ToFake();

    public class Host : IHost
    {
        #region Root
        private readonly IHost _root;

        public Host(IHost root)
        {
            _root = root;
        }

        public IServiceProvider Services => _root.Services;

        public void Dispose()
        {
            _root.Dispose();
        }

        public Task StartAsync(CancellationToken cancel = default)
        {
            return _root.StartAsync(cancel);
        }

        public Task StopAsync(CancellationToken cancel = default)
        {
            return _root.StopAsync(cancel);
        }
        #endregion

        public IMediator Mediator => Services.GetRequiredService<IMediator>();

        #region Sample Receivers
        public List<(int Id, string EmailAddress)> _sampleReceivers = new();

        public IEnumerable<(int Id, string EmailAddress)> SampleReceivers => _sampleReceivers;

        public async Task AddSampleReceivers()
        {
            var mediator = Mediator;
            foreach (var cmd in Provider.CreateReceiverCommands())
            {
                var (Id, _) = await mediator.Send(cmd);
                _sampleReceivers.Add((Id, cmd.EmailAddress));
            }
        }
        #endregion
    }
}

public static class Extensions
{
    public static Fake.Host ToFake(this IHost host) => new(host);

    public static CreateReceiverCommand CreateReceiverCommand(this Faker fake) => new()
    {
        EmailAddress = fake.Internet.Email(),
    };

    public static List<CreateReceiverCommand> CreateReceiverCommands(this Faker fake, int minCount = 10, int maxCount = 20)
        => Enumerable.Range(0, fake.Random.Number(minCount, maxCount))
            .Select(_ => fake.CreateReceiverCommand())
            .ToList();
}