public static IWebHostBuilder ConfigureTestServices(this IWebHostBuilder webHostBuilder, Action <IServiceCollection> servicesConfiguration) { if (webHostBuilder == null) { throw new ArgumentNullException(nameof(webHostBuilder)); } if (servicesConfiguration == null) { throw new ArgumentNullException(nameof(servicesConfiguration)); } if (webHostBuilder.GetType().Name.Equals("GenericWebHostBuilder")) { // Generic host doesn't need to do anything special here since there's only one container. webHostBuilder.ConfigureServices(servicesConfiguration); } else { #pragma warning disable CS0612 // Type or member is obsolete webHostBuilder.ConfigureServices( s => s.AddSingleton <IStartupConfigureServicesFilter>( new ConfigureTestServicesStartupConfigureServicesFilter(servicesConfiguration))); #pragma warning restore CS0612 // Type or member is obsolete } return(webHostBuilder); }