code: def test_export(self):
      forget_wisdom()
  
      before_wisdom = export_wisdom()
  
      self.generate_wisdom()
  
      after_wisdom = export_wisdom()
  
      self.compare(before_wisdom, after_wisdom)
  
file_path: py-fftw/tests/test_pyfftw_wisdom.py
imports: from pyfftw import FFTW, empty_aligned, export_wisdom, import_wisdom, forget_wisdom, _supported_types, _supported_nptypes_complex
  from .test_pyfftw_base import run_test_suites
  import numpy
  import pickle
  import sys
  import unittest
label_desc: Use image node_id 4 for calling the FFTWWisdomTest obj's underlying member method code with example usage: obj.test_export() without return types