code: def test_CategoricalSelector_4():
      """Assert that CategoricalSelector rasies ValueError without categorical features."""
      cs = CategoricalSelector()
  
      assert_raises(ValueError, cs.transform, iris_data)
  
file_path: tpot/tests/feature_transformers_tests.py
imports: from sklearn.datasets import load_iris
  from tpot.builtins import CategoricalSelector, ContinuousSelector
  from nose.tools import assert_equal, assert_raises
label_desc: Use image node_id 4 for calling a global function with example usage: test_CategoricalSelector_4() without return types