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: ghttp_z_unit_feature_router_group_test.go
    path of file: ./repos/gf/net/ghttp
    
    the code of the file until where you have to start completion: // Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
//
// This Source Code Form is subject to the terms of the MIT License.
// If a copy of the MIT was not distributed with this file,
// You can obtain one at https://github.com/gogf/gf.

package ghttp_test

import (
	"bytes"
	"fmt"
	"sync"
	"testing"
	"time"

	"github.com/gogf/gf/v2/frame/g"
	"github.com/gogf/gf/v2/net/ghttp"
	"github.com/gogf/gf/v2/os/glog"
	"github.com/gogf/gf/v2/test/gtest"
	"github.com/gogf/gf/v2/text/gstr"
	"github.com/gogf/gf/v2/uti
    
func Test_Router_Group_MultiServer(t *testing.T) {
	s1 := g.Server(guid.S())
	s2 := g.Server(guid.S())
	s1.Group("/", func(group *ghttp.RouterGroup) {
		group.POST("/post", func(r *ghttp.Request) {
			r.Response.Write("post1")
		})
	})
	s2.Group("/", func(group *ghttp.RouterGroup) {
		group.POST("/post", func(r *ghttp.Request) {
			r.Response.Write("post2")
		})
	})
	s1.SetDumpRouterMap(false)
	s2.SetDumpRouterMap(false)
	gtest.Assert(s1.Start(), nil)
	gtest.Assert(s2.Start(), nil)
	defer s1.Shutdown()
	defer s2.Shutdown()

	time.Sleep(100 * time.Millisecond)
	gtest.C(t, func(t *gtest.T) {
		c1 := g.Client()
		c1.SetPrefix(fmt.Sprintf("http://127.0.0.1:%d", s1.GetListenedPort()))
		c2 := g.Client()
		c2.SetPrefix(fmt.Sprintf("http://127.0.0.1:%d", s2.GetListenedPort()))
		t.Assert(c1.PostContent(ctx, "/post"), "post1")
		t.Assert(c2.PostContent(ctx, "/post"), "post2")
	})
}