code: def test_rfft(self, xp):
      x = xp.asarray(random(29))
      for n in [size(x), 2 * size(x)]:
          for norm in [None, "backward", "ortho", "forward"]:
              xp_assert_close(
                  fft.rfft(x, n=n, norm=norm),
                  fft.fft(x, n=n, norm=norm)[: (n // 2 + 1)],
              )
          xp_assert_close(
              fft.rfft(x, n=n, norm="ortho"),
              fft.rfft(x, n=n)
              / xp.sqrt(xp.asarray(n, dtype=xp.float64)),
          )
  
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_allclose
  from pytest import raises
  import scipy.fft
  from scipy.conftest import array_api_compatible, skip_if_array_api_backend
  from scipy._lib._array_api import array_namespace, size, xp_assert_close, xp_assert_equal
label_desc: Use image node_id 8 for calling the TestFFT1D obj's underlying member method code with example usage: obj.test_rfft(xp) without return types