code: def test_dimpulse(self, xp, scp):
      a = xp.asarray([[0.9, 0.1], [-0.2, 0.9]])
      b = xp.asarray([[0.4, 0.1, -0.1], [0.0, 0.05, 0.0]])
      c = xp.asarray([[0.1, 0.3]])
      d = xp.asarray([[0.0, -0.1, 0.0]])
      dt = 0.5
  
      tout, yout = scp.signal.dimpulse((a, b, c, d, dt), n=10)
      return tout, *yout
  
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 12 for calling the TestDLTI obj's underlying member method code with example usage: obj.test_dimpulse(xp, scp) and returns: tout,  unknown