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: post_e2e_test.go
    path of file: ./repos/mattermost/server/cmd/mmctl/commands
    
    the code of the file until where you have to start completion: // Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
// See LICENSE.txt for license information.

package commands

import (
	"github.com/spf13/cobra"

	"github.com/mattermost/mattermost/server/v8/cmd/mmctl/client"
	"github.com/mattermost/mattermost/server/v8/cmd/mmctl/printer"

	"github.com/mattermost/mattermost/server/public/model"
)

func (s *MmctlE2ETestSuite) TestPostListCmd() {
	s.SetupTestHelper().InitBasic()

	var createNewChannelAndPosts = func() (string, *model.Post, *model.Post) {
		channelName := model.NewRandomString(10)
		channelDisplayName := "channelDisplayName"

		channel, err := s.th.App.CreateChannel(s.th.Context, &model.Channel{Name: channelName, DisplayName: channelDisplayName, Type: model.ChannelTypeOpen, TeamId: s.th.BasicTeam.Id}, false)
		s.Require().Nil(err)

		post1, err := s.th.App.CreatePost(s.th.Context, &model.Post{Message: model.NewRandomString(15), UserId: s.th.BasicUser.Id, ChannelId: channel.Id}, channel, false, false)
		s.Require().Nil(err)

		post2, err := s.th.App.CreatePost(s.th.Context, &model.Post{Message: model.NewRandomString(15), UserId: s.th.BasicUser.Id, ChannelId: channel.Id}, channel, false, false)
		s.Require().Nil(err)

		return channelName, post1, post2
	}

	s.RunForSystemAdminAndLocal("List all posts for a channel", func(c client.Client) {
		printer.
    
func (s *MmctlE2ETestSuite) TestPostListCmd() {
	s.SetupTestHelper().InitBasic()

	var createNewChannelAndPosts = func() (string, *model.Post, *model.Post) {
		channelName := model.NewRandomString(10)
		channelDisplayName := "channelDisplayName"

		channel, err := s.th.App.CreateChannel(s.th.Context, &model.Channel{Name: channelName, DisplayName: channelDisplayName, Type: model.ChannelTypeOpen, TeamId: s.th.BasicTeam.Id}, false)
		s.Require().Nil(err)

		post1, err := s.th.App.CreatePost(s.th.Context, &model.Post{Message: model.NewRandomString(15), UserId: s.th.BasicUser.Id, ChannelId: channel.Id}, channel, false, false)
		s.Require().Nil(err)

		post2, err := s.th.App.CreatePost(s.th.Context, &model.Post{Message: model.NewRandomString(15), UserId: s.th.BasicUser.Id, ChannelId: channel.Id}, channel, false, false)
		s.Require().Nil(err)

		return channelName, post1, post2
	}

	s.RunForSystemAdminAndLocal("List all posts for a channel", func(c client.Client) {
		printer.Clean()

		teamName := s.th.BasicTeam.Name
		channelName, post1, post2 := createNewChannelAndPosts()

		cmd := &cobra.Command{}
		cmd.Flags().Int("number", 2, "")

		err := postListCmdF(c, cmd, []string{teamName + ":" + channelName})
		s.Require().Nil(err)
		s.Equal(2, len(printer.GetLines()))

		printedPost1, ok := printer.GetLines()[0].(*model.Post)
		s.Require().True(ok)
		s.Require().Equal(printedPost1.Message, post1.Message)

		printedPost2, ok := printer.GetLines()[1].(*model.Post)
		s.Require().True(ok)
		s.Require().Equal(printedPost2.Message, post2.Message)
		s.Len(printer.GetErrorLines(), 0)
	})

	s.Run("List all posts for a channel without permissions", func() {
		printer.Clean()

		teamName := s.th.BasicTeam.Name
		channelName, _, _ := createNewChannelAndPosts()

		cmd := &cobra.Command{}
		cmd.Flags().Int("number", 2, "")

		err := postListCmdF(s.th.Client, cmd, []string{teamName + ":" + channelName})
		s.Require().NotNil(err)
		s.Require().Contains(err.Error(), "You do not have the appropriate permissions.")
	})

	s.RunForSystemAdminAndLocal("List all posts for a channel with since flag", func(c client.Client) {
		printer.Clean()

		ISO8601ValidString := "2006-01-02T15:04:05-07:00"
		teamName := s.th.BasicTeam.Name
		channelName, post1, post2 := createNewChannelAndPosts()

		cmd := &cobra.Command{}
		cmd.Flags().String("since", ISO8601ValidString, "")

		err := postListCmdF(c, cmd, []string{teamName + ":" + channelName})
		s.Require().Nil(err)
		s.Equal(2, len(printer.GetLines()))

		printedPost1, ok := printer.GetLines()[0].(*model.Post)
		s.Require().True(ok)
		s.Require().Equal(printedPost1.Message, post1.Message)

		printedPost2, ok := printer.GetLines()[1].(*model.Post)
		s.Require().True(ok)
		s.Require().Equal(printedPost2.Message, post2.Message)
		s.Len(printer.GetErrorLines(), 0)
	})

	s.Run("List all posts for a channel with since flag without permissions", func() {
		printer.Clean()

		ISO8601ValidString := "2006-01-02T15:04:05-07:00"
		teamName := s.th.BasicTeam.Name
		channelName, _, _ := createNewChannelAndPosts()

		cmd := &cobra.Command{}
		cmd.Flags().String("since", ISO8601ValidString, "")

		err := postListCmdF(s.th.Client, cmd, []string{teamName + ":" + channelName})
		s.Require().NotNil(err)
		s.Require().Contains(err.Error(), "You do not have the appropriate permissions.")
	})
}