code: def test_init_requires_order():
      with pytest.raises(
          ValueError, match="GroupBy requires at least one"
      ):
          GroupBy([])
  
file_path: seaborn/tests/_core/test_groupby.py
imports: import numpy
  import pandas
  import pytest
  from numpy.testing import assert_array_equal
  from seaborn._core.groupby import GroupBy
label_desc: Use image node_id 4 for calling a global function with example usage: test_init_requires_order() without return types