code: def multiindex_with_missing_3level_dataframe():
      data = {
          ("a", "", ""): [1, 2, 3],
          ("", "Normal  Distribution", "Hypercuboid (???)"): [1, 2, 3],
          (
              "decorated-elephant",
              "r.i.p-rhino :'(",
              "deadly__flamingo",
          ): [
              1,
              2,
              3,
          ],
      }
      df = pd.DataFrame(data)
      return df
  
file_path: pyjanitor/tests/conftest.py
imports: import os
  import numpy
  import pandas
  import pytest
  from janitor.testing_utils import date_data
label_desc: Use image node_id 7 for calling a global function with example usage: multiindex_with_missing_3level_dataframe() and returns: df