code: def test_random_signals(self, xp, scp, x, func):
      assert x.shape == (200, 20)
      if xp == np:
          x = x.get()
      return func(x, xp, scp)
  
imports: from math import pi
  import pytest
  import cupy
  import numpy
  from cupy import testing
  from cupy.testing import assert_allclose
  import cupyx.scipy.fft
  import cupyx.scipy.signal
label_desc: Use image node_id 10 for calling the Test1D obj's underlying member method code with example usage: obj.test_random_signals(xp, scp, x, func) and returns: func