code: def test_vs_naive_delta(self, x_dtype, h, up, down, case, xp, scp):
      x, h = make_case(up, down, h, x_dtype, case)
      x = xp.asarray(x)
      h = xp.asarray(h)
      y = scp.signal.upfirdn(h, x, up, down)
      return y
  
file_path: cupy/tests/cupyx_tests/scipy_tests/signal_tests/test_upfirdn.py
imports: from itertools import product
  import pytest
  import numpy
  from cupy import testing
  from cupyx.scipy.signal._upfirdn import _output_len
label_desc: Use image node_id 6 for calling the TestUpfirdn obj's underlying member method code with example usage: obj.test_vs_naive_delta(x_dtype, h, up, down, case, xp, scp) and returns: y