code: def uniontest_df1():
      return pd.DataFrame(
          dict(
              jerbs=pd.Categorical(
                  ["fireman", "programmer", "astronaut"]
              ),
              fruits=pd.Categorical(["apple", "banana", "orange"]),
              data=[1, 2, 3],
              df1_exclusive="somedata",
          )
      )
  
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 1 for calling a global function with example usage: uniontest_df1() and returns: pd