code: def test_extract(self, xp):
      a = testing.shaped_arange((3, 3), xp)
      b = xp.array(
          [
              [True, False, True],
              [False, True, False],
              [True, False, True],
          ]
      )
      return xp.extract(b, a)
  
imports: import unittest
  import numpy
  import pytest
  import cupy
  from cupy import testing
label_desc: Use image node_id 24 for calling the TestIndexing obj's underlying member method code with example usage: obj.test_extract(xp) and returns: xp