code: def forward_expected(self, inputs):
      (x,) = inputs
      function = getattr(numpy, self.function_name)
      expected = function(x, axis=self.axis)
      expected = utils.force_array(expected)
      return (expected,)
  
imports: import unittest
  import numpy
  import chainer
  from chainer import functions
  from chainer import testing
  from chainer import utils
label_desc: Use image node_id 3 for calling the TestArgMinMax obj's underlying member method code with example usage: obj.forward_expected(inputs) and returns: expected