log.Errorf("failed to send: %v", err)
				return err
			}
		} else {
			log.Errorf("failed to call tap request: %v", err)
			return err
		}
	}
	return nil
}

func (p *tapProxy) DeltaAggregatedResources(downstream DeltaDiscoveryStream) error {
	return fmt.Errorf("not implemented")

	t.Helper()
	adsClient := discovery.NewAggregatedDiscoveryServiceClient(conn)
	downstream, err := adsClient.DeltaAggregatedResources(ctx)
	if err != nil {
		t.Fatal(err)
	}
	return downstream
}

	test.SetForTest(t, &features.DeltaXds, true)
	return NewDeltaXdsTest(t, conn, func(conn *grpc.ClientConn) (DeltaDiscoveryClient, error) {
		xds := discovery.NewAggregatedDiscoveryServiceClient(conn)
		return xds.DeltaAggregatedResources(context.Background())
	})
}

func NewDeltaXdsTest(t test.Failer, conn *grpc.ClientConn,
	getClient func(conn *grpc.ClientConn) (DeltaDiscoveryClient, error),
) *DeltaAdsTest {