Fixed #24338 -- Accepted Template wrapper in {% extends %}.

Explicitly checking for django.template.Template subclasses is
preferrable to duck-typing because both the django.template.Template and
django.template.backends.django.Template have a render() method.

Thanks spectras for the report.

1 files changed, 11 insertions, 1 deletions

diff --git a/tests/template_tests/tests.py b/tests/template_tests/tests.py
index c57c3d1479..ffc3064b41 100644
--- a/tests/template_tests/tests.py
+++ b/tests/template_tests/tests.py
@@ -10,7 +10,7 @@ from django.contrib.auth.models import Group
 from django.core import urlresolvers
 from django.template import (
     Context, RequestContext, Template, TemplateSyntaxError,
-    base as template_base, loader,
+    base as template_base, engines, loader,
 )
 from django.template.engine import Engine
 from django.template.loaders import app_directories, filesystem
@@ -414,6 +414,16 @@ class TemplateRegressionTests(SimpleTestCase):
         t1 = Template('{% debug %}')
         self.assertIn("清風", t1.render(c1))
 
+    def test_extends_generic_template(self):
+        """
+        {% extends %} accepts django.template.backends.django.Template (#24338).
+        """
+        parent = engines['django'].from_string(
+            '{% block content %}parent{% endblock %}')
+        child = engines['django'].from_string(
+            '{% extends parent %}{% block content %}child{% endblock %}')
+        self.assertEqual(child.render({'parent': parent}), 'child')
+
 
 class TemplateTagLoading(SimpleTestCase):