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: root_unix_test.go
    path of file: ./repos/helm/cmd/helm
    
    the code of the file until where you have to start completion: //go:build !windows

/*
Copyright The Helm Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package main

import (
	"bytes"
	"io"
	"os"
	"path/filepath"
	"strings"
	"testing"
)

func checkPermsStderr() (string, error) {
	r, w, err := os.Pipe()
	if err != nil {
		return "", err
	}

	stderr := os.Stderr
	os.Stderr = w
	defer func() {
		os.Stderr = stderr
	}()

	checkPerms()
	w.Close()

	var text bytes.Buffer
	io.Copy(&text, r)
	return text.String(), nil
}

func TestCheckPerms(t *testing.T) {
	
    
func TestCheckPerms(t *testing.T) {
	tdir := t.TempDir()
	tfile := filepath.Join(tdir, "testconfig")
	fh, err := os.OpenFile(tfile, os.O_CREATE|os.O_APPEND|os.O_RDWR, 0440)
	if err != nil {
		t.Errorf("Failed to create temp file: %s", err)
	}

	tconfig := settings.KubeConfig
	settings.KubeConfig = tfile
	defer func() { settings.KubeConfig = tconfig }()

	text, err := checkPermsStderr()
	if err != nil {
		t.Fatalf("could not read from stderr: %s", err)
	}
	expectPrefix := "WARNING: Kubernetes configuration file is group-readable. This is insecure. Location:"
	if !strings.HasPrefix(text, expectPrefix) {
		t.Errorf("Expected to get a warning for group perms. Got %q", text)
	}

	if err := fh.Chmod(0404); err != nil {
		t.Errorf("Could not change mode on file: %s", err)
	}
	text, err = checkPermsStderr()
	if err != nil {
		t.Fatalf("could not read from stderr: %s", err)
	}
	expectPrefix = "WARNING: Kubernetes configuration file is world-readable. This is insecure. Location:"
	if !strings.HasPrefix(text, expectPrefix) {
		t.Errorf("Expected to get a warning for world perms. Got %q", text)
	}
}