code: def test_unionize_dataframe_categories_original_preservation(
      uniontest_df1, uniontest_df2
  ):
      udf1, udf2 = janitor.unionize_dataframe_categories(
          uniontest_df1, uniontest_df2
      )
  
      assert not (
          set(uniontest_df1["fruits"].dtype.categories)
          == set(udf1["fruits"].dtype.categories)
      )
  
file_path: pyjanitor/tests/functions/test_unionize_dataframe_categories.py
imports: import pandas
  import pytest
  from pandas.testing import assert_frame_equal
  import janitor
label_desc: Use image node_id 6 for calling a global function with example usage: test_unionize_dataframe_categories_original_preservation(uniontest_df1, uniontest_df2) without return types