code: def test_feature_names(xgb_booster):
      assert xgb_booster.feature_names == [
          "Pclass",
          "Survived",
          "Fare",
          "Sex_label",
          "Cabin_label",
          "Embarked_label",
      ]
  
file_path: dtreeviz/testing/testlib/models/test_decision_tree_xgb_regressor.py
imports: import joblib
  import numpy
  import pytest
  import xgboost
  from dtreeviz.models.xgb_decision_tree import ShadowXGBDTree
label_desc: Use image node_id 5 for calling a global function with example usage: test_feature_names(xgb_booster) without return types