text: import numpy as np
  import pytest
  
  from pandas import (
      Series,
      array,
  )
  
  
  @pytest.fixture(params=[None, False])
  def sort(request):
      """
      Valid values for the 'sort' parameter used in the Index
      setops methods (intersection, union, etc.)
  
      Caution:
          Don't confuse this one with the "sort" fixture used
          for DataFrame.append or concat. That one has
          parameters [True, False].
  
          We can't combine them as sort=True is not permitted
          in the Index setops methods.
      """
      return request.param
  
  
  @pytest.fixture(params=["D", "3D", "-3D", "H", "2H", "-2H", "T", "2T", "S", "-3S"])
  def freq_sample(request):
      """
      Valid values for 'freq' parameter used to create date_range and
      timedelta_range..
      """
      return request.param
  
  
  @pytest.fixture(params=[list, np.array, array, Series])
  def listlike_box(request):
      """
      Types that may be passed as the indexer to searchsorted.
      """
      return request.param
  
  
  # TODO: not clear if this _needs_ to be different from listlike_box or
  #  if that is just a historical artifact
  @pytest.fixture(params=[list, tuple, np.array, Series])
  def listlike_box_with_tuple(request):
      """
      Types that may be passed as the indexer to searchsorted.
      """
      return request.param
  