code: def test_shape(self, xp, scp):
      # Regression test for ticket #1480.
      z = xp.zeros((30, 30))
      d0 = scp.signal.decimate(z, 2, axis=0, zero_phase=False)
      d1 = scp.signal.decimate(z, 2, axis=1, zero_phase=False)
      return d0, d1
  
imports: import cupy
  from cupy import testing
  import cupyx.scipy.signal
  import cupyx.scipy.signal.windows
  import numpy
  import pytest
  from math import gcd
label_desc: Use image node_id 4 for calling the TestDecimate obj's underlying member method code with example usage: obj.test_shape(xp, scp) and returns: d0,  d1