credentials auth.Credentials, t *testing.T,
) {
	bucketName1 := fmt.Sprintf("%s-1", bucketName)

	const n = 100
	start := make(chan struct{})
	var ok, errs int
	var wg sync.WaitGroup
	var mu sync.Mutex
	wg.Add(n)
	for i := 0; i < n; i++ {
		go func() {
			defer wg.Done()
			// Sync start.
			<-start
			if err := obj.MakeBucket(GlobalContext, bucketName1, MakeBucketOptions{}); err != nil {