You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: pingservice_test.go
    path of file: ./repos/go-grpc-middleware/testing/testpb
    
    the code of the file until where you have to start completion: // Copyright (c) The go-grpc-middleware Authors.
// Licensed under the Apache License 2.0.

package testpb

import (
	"context"
	"fmt"
	"net"
	"testing"
	"time"

	"github.com/stretchr/testify/require"
	"google.golang.org/grpc"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/credentials/insecure"
	"google.golang.org/grpc/status"
)

func TestPingServiceOnWire(t *testing.T) {
	stopped := make(chan error)
	serverListener, err := net.Listen("tcp", "127.0.0.1:0")
	require.NoError(t, err, "mu
    
func TestPingServiceOnWire(t *testing.T) {
	stopped := make(chan error)
	serverListener, err := net.Listen("tcp", "127.0.0.1:0")
	require.NoError(t, err, "must be able to allocate a port for serverListener")

	server := grpc.NewServer()
	RegisterTestServiceServer(server, &TestPingService{})

	go func() {
		defer close(stopped)
		stopped <- server.Serve(serverListener)
	}()
	defer func() {
		server.Stop()
		<-stopped
	}()

	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
	defer cancel()

	// This is the point where we hook up the interceptor.
	clientConn, err := grpc.DialContext(
		ctx,
		serverListener.Addr().String(),
		grpc.WithTransportCredentials(insecure.NewCredentials()),
		grpc.WithBlock(),
	)
	require.NoError(t, err, "must not error on client Dial")

	testClient := NewTestServiceClient(clientConn)
	select {
	case err := <-stopped:
		t.Fatal("gRPC server stopped prematurely", err)
	default:
	}

	r, err := testClient.PingEmpty(context.Background(), &PingEmptyRequest{})
	require.NoError(t, err)
	require.NotNil(t, r)

	r2, err := testClient.Ping(context.Background(), &PingRequest{Value: "24"})
	require.NoError(t, err)
	require.Equal(t, "24", r2.Value)
	require.Equal(t, int32(0), r2.Counter)

	_, err = testClient.PingError(context.Background(), &PingErrorRequest{
		ErrorCodeReturned: uint32(codes.Internal),
		Value:             "24",
	})
	require.Error(t, err)
	require.Equal(t, codes.Internal, status.Code(err))

	l, err := testClient.PingList(context.Background(), &PingListRequest{Value: "24"})
	require.NoError(t, err)
	for i := 0; i < ListResponseCount; i++ {
		r, err := l.Recv()
		require.NoError(t, err)
		require.Equal(t, "24", r.Value)
		require.Equal(t, int32(i), r.Counter)
	}

	s, err := testClient.PingStream(context.Background())
	require.NoError(t, err)
	for i := 0; i < ListResponseCount; i++ {
		require.NoError(t, s.Send(&PingStreamRequest{Value: fmt.Sprintf("%v", i)}))

		r, err := s.Recv()
		require.NoError(t, err)
		require.Equal(t, fmt.Sprintf("%v", i), r.Value)
		require.Equal(t, int32(i), r.Counter)
	}

	select {
	case err := <-stopped:
		t.Fatal("gRPC server stopped prematurely", err)
	default:
	}
}