code: def test_more_step_and_impulse_3(self, xp, scp):
      # Check that dt=0.1, n=3 gives 3 time values.
      system = ([1.0], [1.0, -0.5], 0.1)
      t, (y,) = scp.signal.dstep(system, n=3)
      t1, (y1,) = scp.signal.dimpulse(system, n=3)
      return t, y, t1, y1
  
imports: from math import sqrt, pi
  from pytest import raises
  import cupy
  from cupy import testing
  import cupyx.scipy.signal
label_desc: Use image node_id 21 for calling the TestDLTI obj's underlying member method code with example usage: obj.test_more_step_and_impulse_3(xp, scp) and returns: t,  y,  t1,  y1