Added a testcase for add_extension

--HG--
branch : trunk

1 files changed, 6 insertions, 0 deletions

diff --git a/jinja2/testsuite/ext.py b/jinja2/testsuite/ext.py
index 98e4161..f97853d 100644
--- a/jinja2/testsuite/ext.py
+++ b/jinja2/testsuite/ext.py
@@ -158,6 +158,12 @@ class StreamFilterExtension(Extension):
 
 class ExtensionsTestCase(JinjaTestCase):
 
+    def test_extend_late(self):
+        env = Environment()
+        env.add_extension('jinja2.ext.autoescape')
+        t = env.from_string('{% autoescape true %}{{ "<test>" }}{% endautoescape %}')
+        assert t.render() == '&lt;test&gt;'
+
     def test_loop_controls(self):
         env = Environment(extensions=['jinja2.ext.loopcontrols'])