code: def test_cache_enable_disable(self):
      self.assertIs(interfaces.cache._fftw_cache, None)
  
      interfaces.cache.enable()
      self.assertIsInstance(
          interfaces.cache._fftw_cache, interfaces.cache._Cache
      )
  
      interfaces.cache.disable()
      self.assertIs(interfaces.cache._fftw_cache, None)
  
imports: import copy
  import sys
  from pyfftw import interfaces, builders
  import pyfftw
  import numpy
  import numpy
  import unittest
  from .test_pyfftw_base import run_test_suites, miss
  from .test_pyfftw_numpy_interface import InterfacesNumpyFFTTestFFT
  import threading
  import time
  import os
  import hashlib
label_desc: Use image node_id 3 for calling the InterfacesCacheTest obj's underlying member method code with example usage: obj.test_cache_enable_disable() without return types