code: def test_cascade(self, J, i, xp, scp):
      lpcoef = scp.signal.daub(i)
      x, phi, psi = scp.signal.cascade(lpcoef, J)
      return x, phi, psi
  
file_path: cupy/tests/cupyx_tests/scipy_tests/signal_tests/test_wavelets.py
imports: import pytest
  from cupy import testing
  import cupyx.scipy.signal
label_desc: Use image node_id 3 for calling the TestWavelets obj's underlying member method code with example usage: obj.test_cascade(J, i, xp, scp) and returns: x,  phi,  psi