prevent leakage of FLAGS changes across tests

1 files changed, 12 insertions, 0 deletions

diff --git a/nova/tests/flags_unittest.py b/nova/tests/flags_unittest.py
index d49d5dc43..714170e5e 100644
--- a/nova/tests/flags_unittest.py
+++ b/nova/tests/flags_unittest.py
@@ -20,6 +20,8 @@ from nova import exception
 from nova import flags
 from nova import test
 
+FLAGS = flags.FLAGS
+flags.DEFINE_string('flags_unittest', 'foo', 'for testing purposes only')
 
 class FlagsTestCase(test.TrialTestCase):
     def setUp(self):
@@ -85,3 +87,13 @@ class FlagsTestCase(test.TrialTestCase):
 
         self.assert_('runtime_answer' in self.global_FLAGS)
         self.assertEqual(self.global_FLAGS.runtime_answer, 60)
+
+    def test_flag_leak_left(self):
+        self.assertEqual(FLAGS.flags_unittest, 'foo')
+        FLAGS.flags_unittest = 'bar'
+        self.assertEqual(FLAGS.flags_unittest, 'bar')
+
+    def test_flag_leak_right(self):
+        self.assertEqual(FLAGS.flags_unittest, 'foo')
+        FLAGS.flags_unittest = 'bar'
+        self.assertEqual(FLAGS.flags_unittest, 'bar')