code: def test_concat_key_order(self):
      dataset_a = dummy_dataset.DummyDataset()
      dataset_b = dummy_dataset.DummyDataset(keys=("b", "a", "c"))
  
      with self.assertRaises(ValueError):
          dataset_a.concat(dataset_b)
  
file_path: chainer/tests/chainer_tests/dataset_tests/tabular_tests/test_concat.py
imports: import operator
  import unittest
  import numpy
  import six
  import chainer
  from chainer import testing
  from chainer_tests.dataset_tests.tabular_tests import dummy_dataset
label_desc: Use image node_id 2 for calling the TestConcatInvalid obj's underlying member method code with example usage: obj.test_concat_key_order() without return types