code: def test_diag_indices(self, xp):
      return xp.diag_indices(self.n, self.ndim)
  
imports: import unittest
  import numpy
  import pytest
  import cupy
  from cupy import testing
label_desc: Use image node_id 1 for calling the TestDiagIndicesInvalidValues obj's underlying member method code with example usage: obj.test_diag_indices(xp) and returns: xp