code: def test_rfft(self):
      a = np.ones(self.input_shape)
      self._test_mtsame(fft.rfft, a)
  
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 4 for calling the TestFFTThreadSafe obj's underlying member method code with example usage: obj.test_rfft() without return types