code: def test_pos_neg_duplicate_axis(self):
      with self.assertRaises(ValueError):
          self.x.prod(axis=(1, -2))
  
file_path: chainer/tests/chainer_tests/functions_tests/math_tests/test_prod.py
imports: import unittest
  import numpy
  from chainer import functions
  from chainer import testing
label_desc: Use image node_id 5 for calling the TestProdError obj's underlying member method code with example usage: obj.test_pos_neg_duplicate_axis() without return types