code: def test_rfft(self):
      x = random(29)
      for n in [x.size, 2 * x.size]:
          for norm in [None, "backward", "ortho", "forward"]:
              assert_array_almost_equal(
                  fft.fft(x, n=n, norm=norm)[: (n // 2 + 1)],
                  fft.rfft(x, n=n, norm=norm),
              )
          assert_array_almost_equal(
              fft.rfft(x, n=n) / np.sqrt(n),
              fft.rfft(x, n=n, norm="ortho"),
          )
  
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 8 for calling the TestFFT1D obj's underlying member method code with example usage: obj.test_rfft() without return types