code: def test_offset_tuple_col():
      """Testing offset_tuple_col."""
      df = pd.DataFrame({"a": [1, 4, 7], "b": [(1, 2), (3, 5), (4, 8)]})
  
      res = offset_tuple_col(df=df, offset_col="a", tuple_col="b")
  
      expected = pd.Series(
          [(1 + 1, 2 + 1), (3 + 4, 5 + 4), (4 + 7, 8 + 7)]
      )
  
      assert (
          res == expected
      ).min(), "Tuple values are not offset correctly."
  
imports: import pandas
  from pandas.testing import assert_frame_equal
  from greykite.algo.uncertainty.conditional.dataframe_utils import limit_tuple_col
  from greykite.algo.uncertainty.conditional.dataframe_utils import offset_tuple_col
label_desc: Use image node_id 2 for calling a global function with example usage: test_offset_tuple_col() without return types