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: with_redis_sentinel_test.go
    path of file: ./repos/athens/pkg/stash
    
    the code of the file until where you have to start completion: package stash

import (
	"context"
	"os"
	"testing"
	"time"

	"github.com/gomods/athens/pkg/config"
	"github.com/gomods/athens/pkg/storage"
	"github.com/gomods/athens/pkg/storage/mem"
	"golang.org/x/sync/errgroup"
)

// WithRedisLock will ensure that 5 concurrent requests will all get the first request's
// response. We can ensure that because only the first response does not return an error
// and therefore all 5 responses should have no error.
func TestWithRedisSentinelLock(t *testing.T) {
	endpoint := os.Getenv("REDIS_SENTINEL_TEST_ENDPOINT")
	masterName := os.Getenv("REDIS_SENTINEL_TEST_MASTER_NAME")
	password := os.Getenv("REDIS_SENTINEL_TEST_PASSWORD")
	if len(endpoint) == 0 || len(masterName) ==
    
func TestWithRedisSentinelLock(t *testing.T) {
	endpoint := os.Getenv("REDIS_SENTINEL_TEST_ENDPOINT")
	masterName := os.Getenv("REDIS_SENTINEL_TEST_MASTER_NAME")
	password := os.Getenv("REDIS_SENTINEL_TEST_PASSWORD")
	if len(endpoint) == 0 || len(masterName) == 0 || len(password) == 0 {
		t.SkipNow()
	}
	strg, err := mem.NewStorage()
	if err != nil {
		t.Fatal(err)
	}
	ms := &mockRedisStasher{strg: strg}
	l := &testingRedisLogger{t: t}

	wrapper, err := WithRedisSentinelLock(l, []string{endpoint}, masterName, password, storage.WithChecker(strg), config.DefaultRedisLockConfig())
	if err != nil {
		t.Fatal(err)
	}
	s := wrapper(ms)

	var eg errgroup.Group
	for i := 0; i < 5; i++ {
		eg.Go(func() error {
			ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
			defer cancel()
			_, err := s.Stash(ctx, "mod", "ver")
			return err
		})
	}

	err = eg.Wait()
	if err != nil {
		t.Fatal(err)
	}
}