fixed bug with static unicode strings and auto escaping

--HG--
branch : trunk
diff --git a/tests/test_ext.py b/tests/test_ext.py
index f91b0f7..7da2515 100644
--- a/tests/test_ext.py
+++ b/tests/test_ext.py
@@ -66,3 +66,7 @@
     env = Environment(extensions=[TestExtension])
     tmpl = env.from_string('{% test %}')
     assert tmpl.render() == 'False|42|23|{}'
+
+
+def test_identifier():
+    assert TestExtension.identifier == __name__ + '.TestExtension'