code: def test_empty_groups(fill_df):
      """Raise ValueError if any of the groups is empty."""
      with pytest.raises(
          ValueError, match="entry in columns argument cannot be empty"
      ):
          fill_df.complete("group", {})
  
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 6 for calling a global function with example usage: test_empty_groups(fill_df) without return types