code: def test_ihfft(self):
      x = random(14) + 1j * random(14)
      x_herm = np.concatenate((random(1), x, random(1)))
      x = np.concatenate((x_herm, x[::-1].conj()))
      assert_array_almost_equal(x_herm, fft.ihfft(fft.hfft(x_herm)))
      for norm in ["backward", "ortho", "forward"]:
          assert_array_almost_equal(
              x_herm, fft.ihfft(fft.hfft(x_herm, norm=norm), norm=norm)
          )
  
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 15 for calling the TestFFT1D obj's underlying member method code with example usage: obj.test_ihfft() without return types