Support nose framework for the whole test suite.

--HG--
branch : trunk
diff --git a/tests/test_forloop.py b/tests/test_forloop.py
index c5bac48..0c93484 100644
--- a/tests/test_forloop.py
+++ b/tests/test_forloop.py
@@ -6,9 +6,14 @@
     :copyright: (c) 2009 by the Jinja Team.
     :license: BSD, see LICENSE for more details.
 """
-from py.test import raises
 from jinja2.exceptions import UndefinedError, TemplateSyntaxError
 
+import conftest
+if conftest.NOSE:
+    from nose.tools import assert_raises as raises
+else:
+    from py.test import raises
+
 
 SIMPLE = '''{% for item in seq %}{{ item }}{% endfor %}'''
 ELSE = '''{% for item in seq %}XXX{% else %}...{% endfor %}'''