code: def test_dry_run(gcloud_run):
      res = runner.invoke(
          cli.app, ["start", "test-cluster", "--dry-run"]
      )
      assert res.exit_code == 0
      assert gcloud_run.call_count == 0
  
imports: import pytest
  from typer.testing import CliRunner
  from hailtop.hailctl.dataproc import cli
label_desc: Use image node_id 2 for calling a global function with example usage: test_dry_run(gcloud_run) without return types