humanize tests depend on a test case mixin defined on tests/i18n/__init__.py

[Ramiro Morales]

As reported in django-users (​https://groups.google.com/d/topic/django-users/u1sycmDbO9c/discussion):

1. Having 'django.contrib.humanize' listed in INSTALLED_APPS
2. Using TEST_RUNNER='django.test.simple.DjangoTestSuiteRunner'
3. Trying to run the tests using manage.py test

Reported against 1.6b4 but an be reproduced with current 1.6.x and master.

Result of discussion on IRC resulted a suggested fix: Move the TransRealMixin added in 9a1ea4e7e8214a001ca43ae6f0fcea96a5d51489 to a place under the django hierarchy, i.e. django.test.utils that would allow it to be imported using an absolute import.

[Ramiro Morales]

This is the actual error output:

$ ./manage.py test
django/test/_doctest.py:57: DeprecationWarning: The django.test._doctest module is deprecated; use the doctest module from the Python standard library instead.   DeprecationWarning)

django/test/simple.py:26: DeprecationWarning: The django.test.simple module and DjangoTestSuiteRunner are deprecated; use django.test.runner.DiscoverRunner instead.   DeprecationWarning)

Traceback (most recent call last):
  File "./manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "django/core/management/__init__.py", line 408, in execute_from_command_line
    utility.execute()
  File "django/core/management/__init__.py", line 401, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "django/core/management/commands/test.py", line 50, in run_from_argv
    super(Command, self).run_from_argv(argv)
  File "django/core/management/base.py", line 244, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "django/core/management/commands/test.py", line 71, in execute
    super(Command, self).execute(*args, **options)
  File "django/core/management/base.py", line 291, in execute
    output = self.handle(*args, **options)
  File "django/core/management/commands/test.py", line 88, in handle
    failures = test_runner.run_tests(test_labels)
  File "django/test/runner.py", line 145, in run_tests
    suite = self.build_suite(test_labels, extra_tests)
  File "django/test/simple.py", line 249, in build_suite
    suite.addTest(build_suite(app))
  File "django/test/simple.py", line 151, in build_suite
    test_module = get_tests(app_module)
  File "django/test/simple.py", line 103, in get_tests
    test_module = import_module('.'.join(prefix + [TEST_MODULE]))
  File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
  File "django/contrib/humanize/tests.py", line 21, in <module>
    from i18n import TransRealMixin
ImportError: No module named i18n

I've opened a PR with a propsed fix: ​https://github.com/django/django/pull/1796

[Ramiro Morales <cramm0@…>]

In 51d2e1fb233b5507bf14300787939717c4d93834:

Fixed #21307 -- Moved TransRealMixin to django.test.utils.

[Ramiro Morales <cramm0@…>]

In bcc65c13a086f3e6d24dc7fc92a167fd836af501:

[1.6.x] Fixed #21307 -- Moved TransRealMixin to django.test.utils.

51d2e1fb23 from master.