blog.stevanfreeborn.com/test/Blog.Tests/EndToEnd/BlogHostFactory.cs

namespace Blog.Tests.EndToEnd;

public class BlogHostFactory<TProgram> : WebApplicationFactory<TProgram> where TProgram : class
{
  public BlogHostFactory()
  {
    UseKestrel(server => server.Listen(IPAddress.Loopback, 0));
  }

  public string ServerAddress
  {
    get
    {
      StartServer();
      return ClientOptions.BaseAddress.ToString();
    }
  }

  protected override void ConfigureWebHost(IWebHostBuilder builder)
  {
    builder.ConfigureLogging(config => config.ClearProviders());
    builder.ConfigureTestServices(services =>
    {
      var postsDirectory = Path.Combine(Directory.GetCurrentDirectory(), "TestPosts");
      var postServiceOptions = new FilePostServiceOptions() { PostsDirectory = postsDirectory };
      services.AddSingleton(Options.Create(postServiceOptions));
    });
  }
}