code: def test_index(self):
      assert_array_equal(
          waveforms.unit_impulse(10, 3), [0, 0, 0, 1, 0, 0, 0, 0, 0, 0]
      )
      assert_array_equal(
          waveforms.unit_impulse((3, 3), (1, 1)),
          [[0, 0, 0], [0, 1, 0], [0, 0, 0]],
      )
  
      # Broadcasting
      imp = waveforms.unit_impulse((4, 4), 2)
      assert_array_equal(
          imp,
          np.array(
              [[0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 1, 0], [0, 0, 0, 0]]
          ),
      )
  
imports: import numpy
  from numpy.testing import assert_almost_equal, assert_equal, assert_, assert_allclose, assert_array_equal
  from pytest import raises
  import scipy.signal.waveforms
label_desc: Use image node_id 2 for calling the TestUnitImpulse obj's underlying member method code with example usage: obj.test_index() without return types