code: def test_scale(client):
      n_jobs = 10
      batch = create_batch(client)
      for _ in range(n_jobs):
          sleep_time = random.uniform(0, 30)
          batch.create_job(
              "alpine:3.8", command=["sleep", str(round(sleep_time))]
          )
  
      batch.submit()
      batch.wait()
      status = legacy_batch_status(batch)
  
      assert batch_status_job_counter(status, "Success") == n_jobs, str(
          (status, batch.debug_info())
      )
      assert all(j["exit_code"] == 0 for j in status["jobs"]), str(
          (status, batch.debug_info())
      )
  
imports: import random
  import pytest
  from hailtop.batch_client.client import BatchClient
  from .utils import batch_status_job_counter, create_batch, legacy_batch_status
label_desc: Use image node_id 2 for calling a global function with example usage: test_scale(client) without return types