Unify test for exception+message value assertion method

[Ramiro Morales]

Currently we have a few copies of methods with similar tasks:

$ ack def\ assertRaises --python
[...]
tests/regressiontests/forms/fields.py
52:    def assertRaisesErrorWithMessage(self, error, message, callable, *args, **kwargs):

tests/regressiontests/forms/localflavor/be.py
11:    def assertRaisesErrorWithMessage(self, error, message, callable, *args, **kwargs):

tests/regressiontests/utils/datastructures.py
11:    def assertRaisesErrorWithMessage(self, error, message, callable,

tests/regressiontests/queries/tests.py
24:    def assertRaisesMessage(self, exc, msg, func, *args, **kwargs):

tests/regressiontests/fixtures_regress/tests.py
340:    def assertRaisesMessage(self, exc, msg, func, *args, **kwargs):

tests/regressiontests/urlpatterns_reverse/tests.py
136:    def assertRaisesErrorWithMessage(self, error, message, callable,

tests/regressiontests/custom_columns_regress/tests.py
12:    def assertRaisesMessage(self, exc, msg, func, *args, **kwargs):

tests/regressiontests/admin_validation/tests.py
21:    def assertRaisesMessage(self, exc, msg, func, *args, **kwargs):

tests/regressiontests/file_storage/tests.py
35:    def assertRaisesErrorWithMessage(self, error, message, callable,

And some of them even run the callable twice:

    def assertRaisesErrorWithMessage(self, error, message, callable, *args, **kwargs):
        self.assertRaises(error, callable, *args, **kwargs)
        try:
            callable(*args, **kwargs)
        except error, e:
            self.assertEqual(message, str(e))

[Ramiro Morales]

Simple unification using a new django.test.{Transaction,}TestCase() method

[Ramiro Morales]

Different strategy as sugested by Alex: Migrate to use assertRaisesRegexp() unittest2.TestCase method

[Ramiro Morales]

Same as previous one, moving inheritance of some non-DB tests from django.test.TestCase back to django.utils.unittest.TestCase

[Ramiro Morales]

Updated patch for trunk as of now

[Ramiro Morales]

Uupdated patch

[Ramiro Morales]

Similar patch but using a thin subclass of django.utuls.unitest.TestCase

[Ramiro Morales]

In [16610]:

Fixed #14503 -- Unified multiple implementations of test cases assert* methods that verify a given exception is raised by a callable throughout the Django test suite.

Replaced them with a new assertRaisesMessage method of a new SimpleTestCase, a lightweight subclass of unittest.TestCase. Both are also available for usage in user tests.