code: def test_tarjan_basic():
      simple = np.array([0, 4, 4, 4, 0])
      result = tarjan(simple)
      assert result == []
  
      simple = np.array([0, 2, 0, 4, 2, 2])
      result = tarjan(simple)
      assert result == []
  
imports: import numpy
  import pytest
  from stanza.models.common.chuliu_edmonds import tarjan
label_desc: Use image node_id 1 for calling a global function with example usage: test_tarjan_basic() without return types