code: def multilevel_dataframe():
      arrays = [
          np.array(
              ["bar", "bar", "baz", "baz", "foo", "foo", "qux", "qux"]
          ),
          np.array(
              ["one", "two", "one", "two", "one", "two", "one", "two"]
          ),
      ]
      tuples = list(zip(*arrays))
      index = pd.MultiIndex.from_tuples(
          tuples, names=["first", "second"]
      )
      df = pd.DataFrame(
          np.random.randn(3, 8), index=["A", "B", "C"], columns=index
      )
      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 2 for calling a global function with example usage: multilevel_dataframe() and returns: df