code: def test_creator_label(gcloud_run, gcloud_config):
      gcloud_config["account"] = "test-user@hail.is"
      runner.invoke(cli.app, ["start", "my-cluster"])
      assert (
          "--labels=creator=test-user_hail_is"
          in gcloud_run.call_args[0][0]
      )
  
      gcloud_config["account"] = None
      runner.invoke(cli.app, ["start", "my-cluster"])
      assert not any(
          arg.startswith("--labels=") and "creator=" in arg
          for arg in gcloud_run.call_args[0][0]
      )
  
imports: import pytest
  from typer.testing import CliRunner
  from hailtop.hailctl.dataproc import cli
label_desc: Use image node_id 5 for calling a global function with example usage: test_creator_label(gcloud_run, gcloud_config) without return types