code: def test_diagonal1(self, xp, dtype):
      a = testing.shaped_arange((3, 4, 5), xp, dtype)
      return a.diagonal(1, 2, 0)
  
imports: import numpy
  import pytest
  import cupy
  from cupy import testing
  from cupy import _util
label_desc: Use image node_id 1 for calling the TestArrayDiagonal obj's underlying member method code with example usage: obj.test_diagonal1(xp, dtype) and returns: a