code: def test_aliases():
      g = to_graphviz({"x": 1, "y": "x"})
      labels = list(filter(None, map(get_label, g.body)))
      assert len(labels) == 2
      assert len(g.body) - len(labels) == 1
  
imports: from __future__ import annotations
  import copy
  import os
  import re
  import sys
  from functools import partial
  from operator import add, neg
  import pytest
  from dask.dot import _to_cytoscape_json, cytoscape_graph
  from dask import delayed
  from dask.utils import ensure_not_exists
label_desc: Use image node_id 10 for calling a global function with example usage: test_aliases() without return types