code: def test_CategoricalSelector_fit():
      """Assert that fit() in CategoricalSelector does nothing."""
      op = CategoricalSelector()
      ret_op = op.fit(iris_data)
  
      assert ret_op == op
  
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 5 for calling a global function with example usage: test_CategoricalSelector_fit() without return types