diff --git a/pkg/adapters/objstorage/localstorage/localstorage.go b/pkg/adapters/objstorage/localstorage/localstorage.go
index e23d132..07f632a 100644
--- a/pkg/adapters/objstorage/localstorage/localstorage.go
+++ b/pkg/adapters/objstorage/localstorage/localstorage.go
@@ -60,22 +60,11 @@ func (storage *LocalStorage) Upload(workU *domain.WorkUnit) (*domain.UploadResul
 
 	fullFilePath := filepath.Join(storage.path, workU.Prefix, workU.Filename)
 
-	file, err := os.Create(fullFilePath)
-	if err != nil {
-		return nil, fmt.Errorf("error creating file: %w", err)
-	}
-	defer file.Close()
-
-	_, err = file.Write(workU.Data)
+	err = os.WriteFile(fullFilePath, workU.Data, os.ModePerm)
 	if err != nil {
 		return nil, fmt.Errorf("error writing data into file: %w", err)
 	}
 
-	err = file.Sync()
-	if err != nil {
-		return nil, fmt.Errorf("error when syncing file: %w", err)
-	}
-
 	return &domain.UploadResult{
 		Bucket:      "localstorage",
 		Path:        fullFilePath,
diff --git a/pkg/app/app_test.go b/pkg/app/app_test.go
index f8d23f4..f017566 100644
--- a/pkg/app/app_test.go
+++ b/pkg/app/app_test.go
@@ -196,33 +196,33 @@ func TestAppIntegration(t *testing.T) {
 		testWithBatchSize(t, conf, 1, 1, 1)
 	})
 
-	// t.Run("single entry", func(t *testing.T) {
-	// 	testWithBatchSize(t, conf, 10)
-	// 	testWithBatchSize(t, conf, 18)
-	// 	testWithBatchSize(t, conf, 19)
-	// 	testWithBatchSize(t, conf, 20)
-	// 	testWithBatchSize(t, conf, 21)
-	// 	testWithBatchSize(t, conf, 55)
-	// })
-
-	// t.Run("dual entries", func(t *testing.T) {
-	// 	testWithBatchSize(t, conf, 11, 5)
-	// 	testWithBatchSize(t, conf, 11, 6)
-	// 	testWithBatchSize(t, conf, 10, 6)
-	// 	testWithBatchSize(t, conf, 12, 5)
-	// 	testWithBatchSize(t, conf, 13, 5)
-	// 	testWithBatchSize(t, conf, 55, 66)
-	// })
-
-	// t.Run("only big entries", func(t *testing.T) {
-	// 	testWithBatchSize(t, conf,
-	// 		66, 67, 119)
-	// })
-
-	// t.Run("multiple entries", func(t *testing.T) {
-	// 	testWithBatchSize(t, conf,
-	// 		1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
-	// })
+	t.Run("single entry", func(t *testing.T) {
+		testWithBatchSize(t, conf, 10)
+		testWithBatchSize(t, conf, 18)
+		testWithBatchSize(t, conf, 19)
+		testWithBatchSize(t, conf, 20)
+		testWithBatchSize(t, conf, 21)
+		testWithBatchSize(t, conf, 55)
+	})
+
+	t.Run("dual entries", func(t *testing.T) {
+		testWithBatchSize(t, conf, 11, 5)
+		testWithBatchSize(t, conf, 11, 6)
+		testWithBatchSize(t, conf, 10, 6)
+		testWithBatchSize(t, conf, 12, 5)
+		testWithBatchSize(t, conf, 13, 5)
+		testWithBatchSize(t, conf, 55, 66)
+	})
+
+	t.Run("only big entries", func(t *testing.T) {
+		testWithBatchSize(t, conf,
+			66, 67, 119)
+	})
+
+	t.Run("multiple entries", func(t *testing.T) {
+		testWithBatchSize(t, conf,
+			1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
+	})
 }
 
 func testWithBatchSize(t *testing.T, conf *config.Config, stringExemplarSizes ...int) {