code: def test_MI_1(MI):
      """
      Test output on multiindex columns
      """
      expected = pd.merge(
          MI.iloc[:2],
          pd.DataFrame({("a", "bar"): range(1, 6)}),
          on=[("a", "bar")],
          how="outer",
          sort=True,
      ).rename_axis(columns=[None, None])
      actual = MI.iloc[:2].complete({("a", "bar"): range(1, 5)})
      assert_frame_equal(actual, expected)
  
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 39 for calling a global function with example usage: test_MI_1(MI) without return types