code: def test_none_outputs(setup):
      def f(*_args):
          pass
  
      r1 = spawn(f, args=(0,))
      r2 = spawn(f, args=(r1, 1))
      r3 = spawn(f, args=(r1, 2))
      r4 = spawn(f, args=(r2, r3))
  
      assert r4.execute().fetch() is None
  
imports: from collections import defaultdict
  import numpy
  import pandas
  import pytest
  from ...None import dataframe
  from ...None import get_context
  from ...None import oscar
  from ...None import tensor
  from ...core import tile
  from ...session import get_default_session
  from ...learn.utils import shuffle
  from ...lib.mmh3 import hash
  from ..None import spawn, ExecutableTuple
label_desc: Use image node_id 8 for calling a global function with example usage: test_none_outputs(setup) without return types