code: def uniontest_df2():
      return pd.DataFrame(
          dict(
              jerbs=pd.Categorical(["fireman", "actor", "astronaut"]),
              fruits=pd.Categorical(["grape", "strawberry", "cherry"]),
              data=[4, 5, 6],
              df2_exclusive="otherdata",
              animals=pd.Categorical(["bear", "tiger", "sloth"]),
          )
      )
  
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 2 for calling a global function with example usage: uniontest_df2() and returns: pd