Also copy `__module__` to our dynamically created TestCase subclass when override_settings acts as a class decorator.

Otherwise, an error in e.g. a test in tests/modeltests/proxy_model_inheritance/tests.py
was being reported as:

ERROR: test_table_exists (django.test.utils.ProxyModelInheritanceTests)

Refs #16672 and [16650].

git-svn-id: http://code.djangoproject.com/svn/django/trunk@16722 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/test/utils.py

@@ -211,6 +211,7 @@ class override_settings(object):
                 {
                     '_pre_setup': _pre_setup,
                     '_post_teardown': _post_teardown,
+                    '__module__': test_func.__module__,
                 })
         else:
             @wraps(test_func)

tests/regressiontests/settings_tests/tests.py

@@ -18,6 +18,9 @@ class FullyDecoratedTranTestCase(TransactionTestCase):
     def test_decorated_testcase_name(self):
         self.assertEquals(FullyDecoratedTranTestCase.__name__, 'FullyDecoratedTranTestCase')
 
+    def test_decorated_testcase_module(self):
+        self.assertEquals(FullyDecoratedTranTestCase.__module__, __name__)
+
 FullyDecoratedTranTestCase = override_settings(TEST='override')(FullyDecoratedTranTestCase)
 
 # @override_settings(TEST='override')