code: def test_duplicate_groups(fill_df):
      """Raise ValueError if there are duplicate groups."""
      with pytest.raises(
          ValueError, match="item_id should be in only one group."
      ):
          fill_df.complete("group", "item_id", ("item_id", "item_name"))
  
imports: from string import ascii_lowercase
  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
label_desc: Use image node_id 12 for calling a global function with example usage: test_duplicate_groups(fill_df) without return types