code: def test_verify_raises_AssertionError_on_categories(self):
      # Categories should raise AssertionError
      X = pd.DataFrame(
          [["a", "b", "c"], ["d", "e", "f"]], dtype="category"
      )
      with self.assertRaises(Exception):
          verify_numeric(pd.DataFrame(X))
  
file_path: category_encoders/tests/test_helpers.py
imports: import numpy
  import pandas
  from unittest import TestCase
  from tests.helpers import verify_numeric
label_desc: Use image node_id 3 for calling the TestHelpers obj's underlying member method code with example usage: obj.test_verify_raises_AssertionError_on_categories() without return types