code: def test_stack_with_negative_axis(self, xp):
      a = testing.shaped_arange((2, 3), xp)
      return xp.stack((a, a), axis=-1)
  
imports: import numpy
  import pytest
  import cupy
  from cupy import testing
  from cupy import cuda
label_desc: Use image node_id 49 for calling the TestJoin obj's underlying member method code with example usage: obj.test_stack_with_negative_axis(xp) and returns: xp