code: def test_identity(self):
      maxlen = 512
      x = random(maxlen) + 1j * random(maxlen)
      xr = random(maxlen)
      for i in range(1, maxlen):
          assert_array_almost_equal(
              fft.ifft(fft.fft(x[0:i])), x[0:i], decimal=12
          )
          assert_array_almost_equal(
              fft.irfft(fft.rfft(xr[0:i]), i), xr[0:i], decimal=12
          )
  
imports: import queue
  import threading
  import multiprocessing
  import numpy
  import pytest
  from numpy.random import random
  from numpy.testing import assert_array_almost_equal, assert_array_equal, assert_allclose
  from pytest import raises
  import scipy.fft
label_desc: Use image node_id 1 for calling the TestFFT1D obj's underlying member method code with example usage: obj.test_identity() without return types