code: def test_multi_disconnected_iterable(tmpdir):
      metawf = pe.Workflow(name="meta")
      metawf.base_dir = tmpdir.strpath
      metawf.add_nodes([create_wf("wf%d" % i) for i in range(30)])
      eg = metawf.run(plugin="Linear")
      assert len(eg.nodes()) == 60
  
imports: import os
  from copy import deepcopy
  import pytest
  from ...None import engine
  from ....interfaces import base
  from ....interfaces import utility
  from ....None import config
  from ..utils import clean_working_directory, write_workflow_prov, load_resultfile, format_node
label_desc: Use image node_id 4 for calling a global function with example usage: test_multi_disconnected_iterable(tmpdir) without return types