code: def test_premap_one_array(self, xp):
      return lambda x, y: xp.sum(x * 3, 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 TestFusionReductionAndElementwise obj's underlying member method code with example usage: obj.test_premap_one_array(xp) and returns: function