code: def test_workers(client, s, a, b):
      N = 10
      with client.get_executor(workers=[b["address"]]) as e:
          fs = [e.submit(slowinc, i) for i in range(N)]
          wait(fs)
          has_what = client.has_what()
          assert not has_what.get(a["address"])
          assert len(has_what[b["address"]]) == N
  
imports: from __future__ import annotations
  import random
  from concurrent.futures import FIRST_COMPLETED, FIRST_EXCEPTION, Future, TimeoutError, as_completed, wait
  from time import sleep
  import pytest
  from tlz import take
  from distributed.event import Event
  from distributed.metrics import time
  from distributed.utils import CancelledError
  from distributed.utils_test import inc, slowadd, slowinc, throws, varying
label_desc: Use image node_id 11 for calling a global function with example usage: test_workers(client, s, a, b) without return types