code: def test_sum_axis(self, xp):
      return lambda x: cupy.sum(x, self.axis)
  
imports: import unittest
  import numpy
  import cupy
  from cupy import testing
  from cupy_tests.core_tests.fusion_tests import fusion_utils
label_desc: Use image node_id 2 for calling the TestFusionReductionMultiAxis obj's underlying member method code with example usage: obj.test_sum_axis(xp) and returns: function