code: def test_column_name(dataframe):
      """Raise TypeError if `column_name` is not a string."""
      with pytest.raises(TypeError):
          dataframe.case_when(
              dataframe.a < 10,
              "less_than_10",
              default=dataframe.a,
              column_name=("a",),
          )
  
imports: import numpy
  import pandas
  import pytest
  from hypothesis import given, settings
  from pandas.testing import assert_frame_equal
  from janitor.testing_utils.strategies import categoricaldf_strategy, df_strategy
label_desc: Use image node_id 5 for calling a global function with example usage: test_column_name(dataframe) without return types