Support nose framework for the whole test suite.

--HG--
branch : trunk
diff --git a/tests/test_old_bugs.py b/tests/test_old_bugs.py
index 59d6037..7815bb7 100644
--- a/tests/test_old_bugs.py
+++ b/tests/test_old_bugs.py
@@ -8,9 +8,14 @@
     :copyright: (c) 2009 by the Jinja Team.
     :license: BSD.
 """
-from py.test import raises
 from jinja2 import Environment, DictLoader, TemplateSyntaxError
 
+import conftest
+if conftest.NOSE:
+    from nose.tools import assert_raises as raises
+else:
+    from py.test import raises
+
 
 def test_keyword_folding():
     env = Environment()