code: def test_axis(self, xp, axis):
      x = testing.shaped_arange((2, 3, 4, 5), xp=xp)
      if xp is cupy:
          return self._get_gufunc_scalar("(i)->()")(x, axis=axis)
      else:
          return x.sum(axis=axis)
  
imports: import numpy
  import pytest
  import cupy
  from cupy import testing
  from cupy._core._gufuncs import _GUFunc
label_desc: Use image node_id 5 for calling the TestGUFuncAxes obj's underlying member method code with example usage: obj.test_axis(xp, axis) and returns: self, x