code: def test(self):
      e1 = cufft.CuFFTError(1)
      e2 = pickle.loads(pickle.dumps(e1))
      assert e1.args == e2.args
      assert str(e1) == str(e2)
  
imports: import pickle
  import unittest
  import numpy
  import pytest
  import cupy
  from cupy import testing
  from cupy.cuda import cufft
  from cupy.fft import config
  from cupy.fft._fft import _convert_fft_type
  from ..fft_tests.test_fft import multi_gpu_config, _skip_multi_gpu_bug
label_desc: Use image node_id 1 for calling the TestExceptionPicklable obj's underlying member method code with example usage: obj.test() without return types