diff --git a/nova/tests/test_cloud.py b/nova/tests/test_cloud.py
index 2c6dc597..06191001 100644
--- a/nova/tests/test_cloud.py
+++ b/nova/tests/test_cloud.py
@@ -136,6 +136,22 @@ class CloudTestCase(test.TestCase):
         db.instance_destroy(self.context, inst['id'])
         db.floating_ip_destroy(self.context, address)
 
+    def test_describe_security_groups(self):
+        """Makes sure describe_security_groups works and filters results."""
+        sec = db.security_group_create(self.context,
+                                       {'project_id': self.context.project_id,
+                                        'name': 'test'})
+        result = self.cloud.describe_security_groups(self.context)
+        # NOTE(vish): should have the default group as well
+        self.assertEqual(len(result['securityGroupInfo']), 2)
+        result = self.cloud.describe_security_groups(self.context,
+                      group_name=[sec['name']])
+        self.assertEqual(len(result['securityGroupInfo']), 1)
+        self.assertEqual(
+                result['securityGroupInfo'][0]['groupName'],
+                sec['name'])
+        db.security_group_destroy(self.context, sec['id'])
+
     def test_describe_volumes(self):
         """Makes sure describe_volumes works and filters results."""
         vol1 = db.volume_create(self.context, {})
@@ -294,19 +310,6 @@ class CloudTestCase(test.TestCase):
                 LOG.debug(_("Terminating instance %s"), instance_id)
                 rv = self.compute.terminate_instance(instance_id)
 
-    def test_describe_instances(self):
-        """Makes sure describe_instances works."""
-        instance1 = db.instance_create(self.context, {'host': 'host2'})
-        comp1 = db.service_create(self.context, {'host': 'host2',
-                                                 'availability_zone': 'zone1',
-                                                 'topic': "compute"})
-        result = self.cloud.describe_instances(self.context)
-        self.assertEqual(result['reservationSet'][0]
-                         ['instancesSet'][0]
-                         ['placement']['availabilityZone'], 'zone1')
-        db.instance_destroy(self.context, instance1['id'])
-        db.service_destroy(self.context, comp1['id'])
-
     @staticmethod
     def _fake_set_image_description(ctxt, image_id, description):
         from nova.objectstore import handler
diff --git a/run_tests.py b/run_tests.py
index 5fb5ba32..6cca64ff 100644
--- a/run_tests.py
+++ b/run_tests.py
@@ -38,7 +38,22 @@
 #    LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 #    OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 #    WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+"""Unittest runner for Nova.
 
+To run all tests
+    python run_tests.py
+
+To run a single test:
+    python run_tests.py test_compute:ComputeTestCase.test_run_terminate
+
+To run a single test module:
+    python run_tests.py test_compute
+
+    or
+
+    python run_tests.py api.test_wsgi
+
+"""
 
 import gettext
 import os
@@ -49,14 +64,10 @@ from nose import config
 from nose import core
 from nose import result
 
-from nova import flags
 from nova import log as logging
 from nova.tests import fake_flags
 
 
-FLAGS = flags.FLAGS
-
-
 class _AnsiColorizer(object):
     """
     A colorizer is an object that loosely wraps around a stream, allowing
@@ -265,6 +276,15 @@ class NovaTestRunner(core.TextTestRunner):
 
 if __name__ == '__main__':
     logging.setup()
+    # If any argument looks like a test name but doesn't have "nova.tests" in
+    # front of it, automatically add that so we don't have to type as much
+    argv = []
+    for x in sys.argv:
+        if x.startswith('test_'):
+            argv.append('nova.tests.%s' % x)
+        else:
+            argv.append(x)
+
     testdir = os.path.abspath(os.path.join("nova","tests"))
     c = config.Config(stream=sys.stdout,
                       env=os.environ,
@@ -275,4 +295,4 @@ if __name__ == '__main__':
     runner = NovaTestRunner(stream=c.stream,
                             verbosity=c.verbosity,
                             config=c)
-    sys.exit(not core.run(config=c, testRunner=runner))
+    sys.exit(not core.run(config=c, testRunner=runner, argv=argv))