code: def test_args_even_warning(dataframe):
      """
      Raise Warning if `args` length
      is odd and `default` is None.
      """
      with pytest.warns(DeprecationWarning):
          dataframe.case_when(
              dataframe.a < 10,
              "less_than_10",
              dataframe.a == 5,
              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 4 for calling a global function with example usage: test_args_even_warning(dataframe) without return types