Use assertIsNone(...) instead of assertIs(None,...)

Following OpenStack Style Guidelines: [1]
Unit test assertions tend to give better messages for more
specific assertions. As a result, assertIsNone(...) is
preferred over assertIs(None, ...)

[1] http://docs.openstack.org/developer/hacking/#unit-tests-and-assertraises

Change-Id: Ie4ee3be201f799d87c06378cd2c9a0a3c34c24df

1 files changed, 2 insertions, 2 deletions

diff --git a/cliff/tests/test_app.py b/cliff/tests/test_app.py
index 4430d77..e26e4f7 100644
--- a/cliff/tests/test_app.py
+++ b/cliff/tests/test_app.py
@@ -73,9 +73,9 @@ class TestInteractiveMode(base.TestBase):
         app.interactive_app_factory = mock.MagicMock(
             name='interactive_app_factory'
         )
-        self.assertIs(None, app.interpreter)
+        self.assertIsNone(app.interpreter)
         app.run([])
-        self.assertIsNot(None, app.interpreter)
+        self.assertIsNotNone(app.interpreter)
         cmdloop = app.interactive_app_factory.return_value.cmdloop
         cmdloop.assert_called_once_with()