code: def test_get_scheduler_with_distributed_active(c):
      assert get_scheduler() == c.get
      warning_message = (
          "Running on a single-machine scheduler when a distributed client "
          "is active might lead to unexpected results."
      )
      with pytest.warns(
          UserWarning, match=warning_message
      ) as user_warnings_a:
          get_scheduler(scheduler="threads")
          get_scheduler(scheduler="sync")
      assert len(user_warnings_a) == 2
  
imports: from __future__ import annotations
  import pytest
  import asyncio
  import os
  import sys
  from functools import partial
  from operator import add
  from distributed import Client, SchedulerPlugin, WorkerPlugin
  from distributed.utils_test import cleanup
  from distributed.utils_test import client
  from distributed.utils_test import cluster, cluster_fixture, gen_cluster, loop, loop_in_thread, popen, varying
  import dask
  import dask.bag
  from dask import compute, delayed, persist
  from dask.base import compute_as_if_collection, get_scheduler
  from dask.blockwise import Blockwise
  from dask.delayed import Delayed
  from dask.distributed import futures_of, wait
  from dask.layers import ShuffleLayer, SimpleShuffleLayer
  from dask.utils import get_named_args, get_scheduler_lock, tmpdir, tmpfile
  from dask.utils_test import inc
label_desc: Use image node_id 26 for calling a global function with example usage: test_get_scheduler_with_distributed_active(c) without return types