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: resource_filestore_backup_test.go
    path of file: ./repos/magic-modules/mmv1/third_party/terraform/services/filestore
    
    the code of the file until where you have to start completion: package filestore_test

import (
	"fmt"
	"testing"

	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/resource"
	"github.com/hashicorp/terraform-provider-google/google/acctest"
)

func TestAccFilestoreBackup_update(t *testing.T) {
	t.Parallel()

	instName := fmt.Sprintf("tf-fs-inst-%d", acctest.RandInt(t))
	bkupName := fmt.Sprintf("tf-fs-bkup-%d", acctest.RandInt(t))

	acctest.VcrTest(t, resou
    
func testAccFilestoreBackup_create(instName string, bkupName string) string {
	return fmt.Sprintf(`
resource "google_filestore_instance" "instance" {
  name        = "%s"
  location    = "us-central1-b"
  tier        = "BASIC_HDD"
  description = "An instance created during testing."

  file_shares {
    capacity_gb = 1024
    name        = "share22"
  }

  networks {
    network      = "default"
    modes        = ["MODE_IPV4"]
    connect_mode = "DIRECT_PEERING"
  }
}

resource "google_filestore_backup" "backup" {
	name        = "%s"
	location    = "us-central1"
	source_instance   = google_filestore_instance.instance.id
	source_file_share = "share22"

	description = "This is a filestore backup for the test instance"
}

`, instName, bkupName)
}