code: def get_qualified_location_prefix(self):
      store = self.get_store()
      return store.get_qualified_location("")
  
imports: import unittest
  import yaml
  import uuid
  import os
  import time
  import tempfile
  import shutil
  import requests
  import subprocess
  import boto3
  from studio import model
  from studio.auth import remove_all_keys
  from studio.artifacts.artifact import Artifact
  from studio.gcloud_artifact_store import GCloudArtifactStore
  from studio.storage.storage_handler import StorageHandler
  from studio.extra_util import has_aws_credentials
  from env_detect import on_gcp, on_aws
label_desc: Use image node_id 2 for calling the S3ArtifactStoreTest obj's underlying member method code with example usage: obj.get_qualified_location_prefix() and returns: store