code: def test_get_children_left(shadow_dec_tree: ShadowLightGBMTree):
      assert np.array_equal(
          shadow_dec_tree.get_children_left(),
          np.array(
              [
                  1,
                  2,
                  3,
                  4,
                  -1,
                  -1,
                  -1,
                  8,
                  9,
                  -1,
                  -1,
                  -1,
                  13,
                  14,
                  15,
                  -1,
                  -1,
                  18,
                  -1,
                  -1,
                  21,
                  22,
                  -1,
                  -1,
                  -1,
              ]
          ),
      )
  
file_path: dtreeviz/testing/testlib/models/test_decision_tree_lightgbm_classifier.py
imports: import lightgbm
  import pytest
  from dtreeviz.models.lightgbm_decision_tree import ShadowLightGBMTree
  import numpy
label_desc: Use image node_id 5 for calling a global function with example usage: test_get_children_left(shadow_dec_tree) without return types