public void ConfigureDynamicProxy()
        {
            var hostBuilder = new HostBuilder();

            hostBuilder.ConfigureDynamicProxy((services, config) =>
            {
                services.AddTransient <IService, Service>();
                config.Interceptors.AddDelegate(async(ctx, next) =>
                {
                    await next(ctx);
                    ctx.ReturnValue = "proxy";
                });
            });
            var host    = hostBuilder.Build();
            var service = host.Services.GetService <IService>();

            Assert.True(service.IsProxy());
        }