code: def test_homomorphic(self, xp, scp):
      # check that it can recover frequency responses of arbitrary
      # linear-phase filters
  
      # for some cases we can get the actual filter back
      h = xp.asarray([1, -1])
      h_new = scp.signal.minimum_phase(xp.convolve(h, h[::-1]))
      return h_new
  
imports: import cupy
  import cupyx.scipy.signal
  from cupy import testing
  import pytest
  from pytest import raises
label_desc: Use image node_id 2 for calling the TestMinimumPhase obj's underlying member method code with example usage: obj.test_homomorphic(xp, scp) and returns: h_new