code: def test_lowpass(self, xp, scp):
      width = 0.04
      ntaps, beta = scp.signal.kaiserord(120, width)
      kwargs = dict(cutoff=0.5, window=("kaiser", beta), scale=False)
      taps = scp.signal.firwin(ntaps, **kwargs)
      return taps
  
imports: import cupy
  import cupyx.scipy.signal
  from cupy import testing
  import pytest
  from pytest import raises
label_desc: Use image node_id 3 for calling the TestFirwin obj's underlying member method code with example usage: obj.test_lowpass(xp, scp) and returns: taps