code: def test_cleantext():
      text = "JFDSM*(@&$:FFDS:;;"
      expected_text = "JFDSM ;FFDS; "
      cleaned_text = _clean_text(text)
      assert cleaned_text == expected_text
  
file_path: streamz/streamz/tests/test_graph.py
imports: from operator import add, mul
  import os
  import pytest
  from streamz import Stream, create_graph, visualize
  from streamz.utils_test import tmpfile
  from ..graph import _clean_text
label_desc: Use image node_id 4 for calling a global function with example usage: test_cleantext() without return types