python - Django 1.4: django.template.loader.render_to_string による DeprecationWarning

Question

Django version 1.4.3

class FooTestCase(TestCase):

    def test_deprecation_warning(self):

        from django.template.loader import render_to_string
        tpl = render_to_string('template.html')

実行時に、これはDeprecationWarning

C:\Python26\lib\site-packages\django\views\generic\simple.py:8: DeprecationWarning: Function-based generic views have been deprecated; use class-based views instead.

なぜ？移行ページには記載されていませんhttps://docs.djangoproject.com/en/1.3/topics/generic-views-migration/