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: grace_test.go
    path of file: ./repos/TarsGo/tars/util/grace
    
    the code of the file until where you have to start completion: package grace

import (
	"fmt"
	"os"
	"os/exec"
	"testing"
)

func TestLis
    
func TestListener(t *testing.T) {
	proto, addr := "tcp", "localhost:3333"
	_, err := CreateListener(proto, addr)
	key := fmt.Sprintf("%s_%s_%s", InheritFdPrefix, proto, addr)
	fmt.Println(err, key, os.Getenv(key))
	cmd := exec.Command("lsof", "-p", fmt.Sprint(os.Getpid()))
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr
	cmd.Start()
	cmd.Wait()
	addr = "localhost:3334"
	_, err = CreateUDPConn(addr)
	key = fmt.Sprintf("%s_%s_%s", InheritFdPrefix, "udp", addr)
	fmt.Println(err, key, os.Getenv(key))
	cmd = exec.Command("lsof", "-p", fmt.Sprint(os.Getpid()))
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr
	cmd.Start()
	cmd.Wait()
}