code: def test_empty_input(self):
      # empty product (empty input):
      result = cartesian_product([])
      expected = []
      assert result == expected
  
file_path: pandas/pandas/tests/reshape/test_util.py
imports: import numpy
  import pytest
  from pandas import Index, date_range
  import pandas._testing
  from pandas.core.reshape.util import cartesian_product
label_desc: Use image node_id 6 for calling the TestCartesianProduct obj's underlying member method code with example usage: obj.test_empty_input() without return types