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: plugin_requests_test.go
    path of file: ./repos/mattermost/server/channels/app
    
    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 app

import (
	"fmt"
	"io"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	"github.com/mattermost/mattermost/server/public/model"
	"github.com/mattermost/mattermost/server/v8/channels/utils/fileutils"
)

func TestServePluginPublicRequest(t *testing.T) {
	installPlugin := func(t *testing.T, th *TestHelper, pluginID string) {
		t.Helper()

		path, _ := fileutils.FindDir("tests")
		fileReader, err := os.Open(filepath.Join(path, fmt.Sprintf("%s.tar.gz", pluginID)))
		require.NoError(t, err)
		defer fileReader.Close()

		_, appErr := th.App.WriteFile(fileReader, getBundleStorePath(pluginID))
		checkNoError(t, appErr)

		appErr = th.App.SyncPlugins()
		checkNoError(t, appErr)

		env := th.App.GetPluginsEnvironment()
		require.NotNil(t, env)

		// Check if installed
		pluginStatus, err := env.Statuses()
		require.NoError(t, err)
		found := false
		for _, pluginStatus := range pluginStatus {
			if pluginStatus.PluginId == pluginID {
				found = true
			}
		}
		require.True(t, found, "failed to find plugin %s in plugin statuses", pluginID)

		appErr = th.App.EnablePlugin(pluginID)
		checkNoError(t, appErr)

		t.Cleanup(func() {
			appErr = th.App.ch.RemovePlugin(pluginID)
			checkNoError(t, appErr)
		})
	}

	t.Run("returns not found when plugins environment is nil", func(t *testing.T) {
		th := Setup(t)
		t.Cleanup(th.TearDown)
		th.App.UpdateConfig(func(cfg *model.Config) { *cfg.PluginSettings.Enable = true })

		req, err := http.NewRequest("GET", "/plugins/plugin_id/public/file.txt", nil)
		require.NoError(t, err)

		rr := httptest.NewRecorder()
		handler := http.HandlerFunc(th.App.ch.ServePluginPublicRequest)
		handler.ServeHTTP(rr, req)

		assert.Equal(t, http.StatusNotFound, rr.Code)
	})

	t.Run("resolves path for valid plugin", func(t *testing.T) {
		th := Setup(t)
		t.Cleanup(th.TearDown)
		th.App.UpdateConfig(func(cfg *model.Config) { *cfg.PluginSettings.Enable = true })

		path, _ := fileutils.FindDir("tests")
		fileReader, err := os.Open(filepath.Join(path, "testplugin.tar.gz"))
		require.NoError(t, err)
		defer fileReader.Close()

		installPlugin(t, th, "testplugin")

		req, err := http.NewRequest("GET", "/plugins/testplugin/public/file.txt", nil)
		require.NoError(t, err)

		rr := httptest.NewRecorder()
		th.App.ch.srv.Router.ServeHTTP(rr, req)

		assert.Equal(t, http.StatusOK, rr.Code)
		body, err := io.ReadAll(rr.Body)
		require.NoError(t, err)
		require.Equal(t, "Hello World!", string(body))
	})

	t.Run("resolves path for valid plugin when subpath configured", func(t *testing.T) {
		os.Setenv("MM_SERVICESETTINGS_SITEURL", "http://localhost:8065/subpath")
		defer os.Unsetenv("MM_SERVICESETTINGS_SITEURL")

		th := Setup(t)
		t.Cleanup(th.TearDown)

		installPlugin(t, th, "testplugin")

		req, err := http.NewRequest("GET", "/subpath/plugins/testplugin/public/file.txt", nil)
		require.NoError(t, err)

		rr := httptest.NewRecorder()
		th.App.ch.srv.RootRouter.ServeHTTP(rr, req)

		assert.Equal(t, http.StatusOK, rr.Code)
		body, err := io.ReadAll(rr.Body)
		require.NoError(t, err)
		assert.Equal(t, "Hello World!", string(body))
	})

	t.Run("fails for invalid plugin", func(t *testing.T) {
		th := Setup(t)
		t.Cleanup(th.TearDown)
		th.App.UpdateConfig(func(cfg *model.Config) { *cfg.PluginSettings.Enable = true })

		req, er
    
func TestServePluginPublicRequest(t *testing.T) {
	installPlugin := func(t *testing.T, th *TestHelper, pluginID string) {
		t.Helper()

		path, _ := fileutils.FindDir("tests")
		fileReader, err := os.Open(filepath.Join(path, fmt.Sprintf("%s.tar.gz", pluginID)))
		require.NoError(t, err)
		defer fileReader.Close()

		_, appErr := th.App.WriteFile(fileReader, getBundleStorePath(pluginID))
		checkNoError(t, appErr)

		appErr = th.App.SyncPlugins()
		checkNoError(t, appErr)

		env := th.App.GetPluginsEnvironment()
		require.NotNil(t, env)

		// Check if installed
		pluginStatus, err := env.Statuses()
		require.NoError(t, err)
		found := false
		for _, pluginStatus := range pluginStatus {
			if pluginStatus.PluginId == pluginID {
				found = true
			}
		}
		require.True(t, found, "failed to find plugin %s in plugin statuses", pluginID)

		appErr = th.App.EnablePlugin(pluginID)
		checkNoError(t, appErr)

		t.Cleanup(func() {
			appErr = th.App.ch.RemovePlugin(pluginID)
			checkNoError(t, appErr)
		})
	}

	t.Run("returns not found when plugins environment is nil", func(t *testing.T) {
		th := Setup(t)
		t.Cleanup(th.TearDown)
		th.App.UpdateConfig(func(cfg *model.Config) { *cfg.PluginSettings.Enable = true })

		req, err := http.NewRequest("GET", "/plugins/plugin_id/public/file.txt", nil)
		require.NoError(t, err)

		rr := httptest.NewRecorder()
		handler := http.HandlerFunc(th.App.ch.ServePluginPublicRequest)
		handler.ServeHTTP(rr, req)

		assert.Equal(t, http.StatusNotFound, rr.Code)
	})

	t.Run("resolves path for valid plugin", func(t *testing.T) {
		th := Setup(t)
		t.Cleanup(th.TearDown)
		th.App.UpdateConfig(func(cfg *model.Config) { *cfg.PluginSettings.Enable = true })

		path, _ := fileutils.FindDir("tests")
		fileReader, err := os.Open(filepath.Join(path, "testplugin.tar.gz"))
		require.NoError(t, err)
		defer fileReader.Close()

		installPlugin(t, th, "testplugin")

		req, err := http.NewRequest("GET", "/plugins/testplugin/public/file.txt", nil)
		require.NoError(t, err)

		rr := httptest.NewRecorder()
		th.App.ch.srv.Router.ServeHTTP(rr, req)

		assert.Equal(t, http.StatusOK, rr.Code)
		body, err := io.ReadAll(rr.Body)
		require.NoError(t, err)
		require.Equal(t, "Hello World!", string(body))
	})

	t.Run("resolves path for valid plugin when subpath configured", func(t *testing.T) {
		os.Setenv("MM_SERVICESETTINGS_SITEURL", "http://localhost:8065/subpath")
		defer os.Unsetenv("MM_SERVICESETTINGS_SITEURL")

		th := Setup(t)
		t.Cleanup(th.TearDown)

		installPlugin(t, th, "testplugin")

		req, err := http.NewRequest("GET", "/subpath/plugins/testplugin/public/file.txt", nil)
		require.NoError(t, err)

		rr := httptest.NewRecorder()
		th.App.ch.srv.RootRouter.ServeHTTP(rr, req)

		assert.Equal(t, http.StatusOK, rr.Code)
		body, err := io.ReadAll(rr.Body)
		require.NoError(t, err)
		assert.Equal(t, "Hello World!", string(body))
	})

	t.Run("fails for invalid plugin", func(t *testing.T) {
		th := Setup(t)
		t.Cleanup(th.TearDown)
		th.App.UpdateConfig(func(cfg *model.Config) { *cfg.PluginSettings.Enable = true })

		req, err := http.NewRequest("GET", "/plugins/invalidplugin/public/file.txt", nil)
		require.NoError(t, err)

		rr := httptest.NewRecorder()
		th.App.ch.srv.Router.ServeHTTP(rr, req)

		assert.Equal(t, http.StatusNotFound, rr.Code)
	})

	t.Run("fails attempting to break out of path", func(t *testing.T) {
		os.Setenv("MM_SERVICESETTINGS_SITEURL", "http://localhost:8065/subpath")
		defer os.Unsetenv("MM_SERVICESETTINGS_SITEURL")

		th := Setup(t)
		t.Cleanup(th.TearDown)

		installPlugin(t, th, "testplugin")
		installPlugin(t, th, "testplugin2")

		req, err := http.NewRequest("GET", "/subpath/plugins/testplugin/public/../../testplugin2/file.txt", nil)
		require.NoError(t, err)

		rr := httptest.NewRecorder()
		th.App.ch.srv.RootRouter.ServeHTTP(rr, req)

		require.Equal(t, http.StatusMovedPermanently, rr.Code)
		assert.Equal(t, "/subpath/plugins/testplugin2/file.txt", rr.Header()["Location"][0])
	})
}