code: def test_lt(self):
      x = cupy.array([3, 7])
      y = MockArray()
      assert (x < y) == ("less", (x, y), {})
      assert (y < x) == ("less", (y, x), {})
  
imports: import contextlib
  import unittest
  import numpy
  import pytest
  import cupy
  from cupy import testing
  import cupyx
label_desc: Use image node_id 3 for calling the TestArrayUfunc obj's underlying member method code with example usage: obj.test_lt() without return types