Remove unused test helper module

rest_framework/tests/test_testcases.py

-# http://djangosnippets.org/snippets/1011/
-from __future__ import unicode_literals
-from django.conf import settings
-from django.core.management import call_command
-from django.db.models import loading
-from django.test import TestCase
-
-NO_SETTING = ('!', None)
-
-
-class TestSettingsManager(object):
-    """
-    A class which can modify some Django settings temporarily for a
-    test and then revert them to their original values later.
-
-    Automatically handles resyncing the DB if INSTALLED_APPS is
-    modified.
-
-    """
-    def __init__(self):
-        self._original_settings = {}
-
-    def set(self, **kwargs):
-        for k, v in kwargs.iteritems():
-            self._original_settings.setdefault(k, getattr(settings, k,
-                                                          NO_SETTING))
-            setattr(settings, k, v)
-        if 'INSTALLED_APPS' in kwargs:
-            self.syncdb()
-
-    def syncdb(self):
-        loading.cache.loaded = False
-        call_command('syncdb', verbosity=0)
-
-    def revert(self):
-        for k, v in self._original_settings.iteritems():
-            if v == NO_SETTING:
-                delattr(settings, k)
-            else:
-                setattr(settings, k, v)
-        if 'INSTALLED_APPS' in self._original_settings:
-            self.syncdb()
-        self._original_settings = {}
-
-
-class SettingsTestCase(TestCase):
-    """
-    A subclass of the Django TestCase with a settings_manager
-    attribute which is an instance of TestSettingsManager.
-
-    Comes with a tearDown() method that calls
-    self.settings_manager.revert().
-
-    """
-    def __init__(self, *args, **kwargs):
-        super(SettingsTestCase, self).__init__(*args, **kwargs)
-        self.settings_manager = TestSettingsManager()
-
-    def tearDown(self):
-        self.settings_manager.revert()
-
-
-class TestModelsTestCase(SettingsTestCase):
-    def setUp(self, *args, **kwargs):
-        installed_apps = tuple(settings.INSTALLED_APPS) + ('rest_framework.tests',)
-        self.settings_manager.set(INSTALLED_APPS=installed_apps)