replace 'with self.assertRaises(Exception):' with different form

I'm guessing that
   with self.assertRaises(Exception):
      something here
is an acceptable form in a newer or older python.  But my
python (2.7.3-0ubuntu7) doesn't like it.

Interestingly, python unittest doc says:
 | Changed in version 2.7: Added the ability to use assertRaises() as 
 | a context manager.

1 files changed, 2 insertions, 4 deletions

diff --git a/tests/unittests/test_distros/test_resolv.py b/tests/unittests/test_distros/test_resolv.py
index d947dda0..6b6ff6aa 100644
--- a/tests/unittests/test_distros/test_resolv.py
+++ b/tests/unittests/test_distros/test_resolv.py
@@ -38,8 +38,7 @@ class TestResolvHelper(MockerTestCase):
         self.assertNotIn('10.3', rp.nameservers)
         self.assertEquals(len(rp.nameservers), 3)
         rp.add_nameserver('10.2')
-        with self.assertRaises(ValueError):
-            rp.add_nameserver('10.3')
+        self.assertRaises(ValueError, rp.add_nameserver, '10.3')
         self.assertNotIn('10.3', rp.nameservers)
 
     def test_search_domains(self):
@@ -58,6 +57,5 @@ class TestResolvHelper(MockerTestCase):
         self.assertEquals(len(rp.search_domains), 5)
         rp.add_search_domain('bbb4.y.com')
         self.assertEquals(len(rp.search_domains), 6)
-        with self.assertRaises(ValueError):
-            rp.add_search_domain('bbb5.y.com')
+        self.assertRaises(ValueError, rp.add_search_domain, 'bbb5.y.com')
         self.assertEquals(len(rp.search_domains), 6)