Confusing unittest diff of failed test.

confusing-unittest-diff.py

import unittest
from collections import namedtuple



class TestToyExample(unittest.TestCase):

    def setUp(self):
        User = namedtuple('User', ['name', 'age', 'sex'])

        bob = User('Bob', 43, 'male')
        self.groups = [
            {
                "id": u"xxxxxxxx",
                "name": "right",
                "admin": bob,
            },
        ]

        self.groups_dump = [
            {
                "id": "xxxxxxxx",
                "name": "right",
                "admin": tuple(bob),
            },
        ]

        self.groups_dump_ = [
            {
                "id": "xxxxxxxx",
                "name": "left",
                "admin": tuple(bob),
            },
        ]

    def test_dumping(self):
        self.assertEqual(self.groups, self.groups_dump)

    def test_dumping_with_mistake(self):
        self.assertEqual(self.groups, self.groups_dump_)


if __name__ == "__main__":
    unittest.main(verbosity=2)

# [OUTPUT]
#  test_dumping (__main__.TestToyExample) ... ok
#  test_dumping_with_mistake (__main__.TestToyExample) ... FAIL
#
#  ======================================================================
#  FAIL: test_dumping_with_mistake (__main__.TestToyExample)
#  ----------------------------------------------------------------------
#  Traceback (most recent call last):
#    File "lindsey-unittest.py", line 40, in test_dumping_with_mistake
#      self.assertEqual(self.groups, self.groups_dump_)
#  AssertionError: Lists differ: [{'admin': User(name='Bob', ag... != [{'admin': ('Bob', 43, 'male')...
#
#  First differing element 0:
#  {'admin': User(name='Bob', age=43, sex='male'), 'id': u'xxxxxxxx', 'name': 'right'}
#  {'admin': ('Bob', 43, 'male'), 'id': 'xxxxxxxx', 'name': 'left'}
#
#  + [{'admin': ('Bob', 43, 'male'), 'id': 'xxxxxxxx', 'name': 'left'}]
#  - [{'admin': User(name='Bob', age=43, sex='male'),
#  -   'id': u'xxxxxxxx',
#  -   'name': 'right'}]
#
#  ----------------------------------------------------------------------
#  Ran 2 tests in 0.002s
#
#  FAILED (failures=1)