code: def test_diagflat3(self, xp):
      a = testing.shaped_arange((3, 3), xp)
      return xp.diagflat(a, -2)
  
imports: import unittest
  import numpy
  import pytest
  import cupy
  from cupy import testing
label_desc: Use image node_id 14 for calling the TestMatrix obj's underlying member method code with example usage: obj.test_diagflat3(xp) and returns: xp