Revert "feat!: remove all access to Old Mongo courses"

openedx/features/course_experience/tests/views/test_course_home.py

@@ -527,25 +527,6 @@ class TestCourseHomePageAccess(CourseHomePageTestCase):
         )
         self.assertRedirects(response, expected_url)
 
-    def test_old_mongo_access_error(self):
-        """
-        Ensure that a user accessing an Old Mongo course sees a redirect to
-        the student dashboard, not a 404.
-        """
-        course = CourseFactory.create(default_store=ModuleStoreEnum.Type.mongo)
-        user = UserFactory(password=self.TEST_PASSWORD)
-        self.client.login(username=user.username, password=self.TEST_PASSWORD)
-
-        response = self.client.get(course_home_url(course))
-
-        expected_params = QueryDict(mutable=True)
-        expected_params['access_response_error'] = f'{course.display_name_with_default} is no longer available.'
-        expected_url = '{url}?{params}'.format(
-            url=reverse('dashboard'),
-            params=expected_params.urlencode(),
-        )
-        self.assertRedirects(response, expected_url)
-
     @mock.patch.dict(settings.FEATURES, {'DISABLE_START_DATES': False})
     def test_expiration_banner_with_expired_upgrade_deadline(self):
         """