[Bug 1736394] Re: unit test failure with oslo.serialization >= 2.21.2

[Ben Nemec]

This was fixed by
https://github.com/openstack/taskflow/commit/50897c0b0a5d389f1571d4079e10643ab537fa53

** Changed in: taskflow
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1736394

Title:
  unit test failure with oslo.serialization >= 2.21.2

Status in taskflow:
  Fix Released
Status in python-taskflow package in Ubuntu:
  Fix Released

Bug description:
  Hi; oslo.serialization 2.21.1 is current in queens upper-
  constraints.txt so this is not impacted more generally in the
  OpenStack ecosystem; in Ubuntu we revved to 2.21.2 at which point we
  see the following error during unit testing:

  ======================================================================
  FAIL: taskflow.tests.unit.worker_based.test_protocol.TestProtocol.test_to_dict_with_invalid_json_failures
  tags: worker-0
  ----------------------------------------------------------------------
  Traceback (most recent call last):
    File "taskflow/tests/unit/worker_based/test_protocol.py", line 174, in test_to_dict_with_invalid_json_failures
      self.assertEqual(expected, request.to_dict())
    File "/home/jamespage/src/openstack/taskflow/.tox/py27/local/lib/python2.7/site-packages/testtools/testcase.py", line 411, in assertEqual
      self.assertThat(observed, matcher, message)
    File "/home/jamespage/src/openstack/taskflow/.tox/py27/local/lib/python2.7/site-packages/testtools/testcase.py", line 498, in assertThat
      raise mismatch_error
  testtools.matchers._impl.MismatchError: !=:
  reference = {'action': 'execute',
   'arguments': {'a': 'a'},
   'failures': {'taskflow.tests.utils.DummyTask': {'causes': [],
                                                   'exc_args': (),
                                                   'exc_type_names': ['RuntimeError',
                                                                      'StandardError',
                                                                      'Exception'],
                                                   'exception_str': u'I am not valid JSON',
                                                   'traceback_str': '',
                                                   'version': 1}},
   'task_cls': 'taskflow.tests.utils.DummyTask',
   'task_name': 'taskflow.tests.utils.DummyTask',
   'task_version': (1, 0)}
  actual    = {'action': 'execute',
   'arguments': {'a': 'a'},
   'failures': {'taskflow.tests.utils.DummyTask': {'causes': [],
                                                   'exc_args': (Exception('I am not valid JSON',),),
                                                   'exc_type_names': ['RuntimeError',
                                                                      'StandardError',
                                                                      'Exception'],
                                                   'exception_str': u'I am not valid JSON',
                                                   'traceback_str': '',
                                                   'version': 1}},
   'task_cls': 'taskflow.tests.utils.DummyTask',
   'task_name': 'taskflow.tests.utils.DummyTask',
   'task_version': (1, 0)}
  Ran 1 (-1663) tests in 0.010s (-88.254s)
  FAILED (id=1, failures=1 (+1))

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