code: def test_cascade(self):
      with pytest.deprecated_call():
          for J in range(1, 7):
              for i in range(1, 5):
                  lpcoef = wavelets.daub(i)
                  k = len(lpcoef)
                  x, phi, psi = wavelets.cascade(lpcoef, J)
                  assert_(len(x) == len(phi) == len(psi))
                  assert_equal(len(x), (k - 1) * 2**J)
  
file_path: scipy/scipy/signal/tests/test_wavelets.py
imports: import numpy
  from numpy.testing import assert_equal, assert_array_equal, assert_array_almost_equal, assert_array_less, assert_
  import pytest
  import scipy.signal._wavelets
label_desc: Use image node_id 3 for calling the TestWavelets obj's underlying member method code with example usage: obj.test_cascade() without return types