code: def test_dlsim_simple1d(self, xp, scp):
      a = xp.array([[0.5]])
      b = xp.array([[0.0]])
      c = xp.array([[1.0]])
      d = xp.array([[0.0]])
      n = 5
      u = xp.zeros(n).reshape(-1, 1)
      tout, yout, xout = scp.signal.dlsim((a, b, c, d, 1), u, x0=1)
      return tout, yout, xout
  
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 17 for calling the TestDLTI obj's underlying member method code with example usage: obj.test_dlsim_simple1d(xp, scp) and returns: tout,  yout,  xout