code: def test_mid(self, size, xp, scp):
      return scp.signal.unit_impulse(size, "mid")
  
imports: import pytest
  import cupy
  from cupy import testing
  import cupyx.scipy.signal
  import numpy
label_desc: Use image node_id 3 for calling the TestUnitImpulse obj's underlying member method code with example usage: obj.test_mid(size, xp, scp) and returns: scp