diff --git a/console_conf/controllers/tests/test_chooser.py b/console_conf/controllers/tests/test_chooser.py
index 1349b483..6c5a6d82 100644
--- a/console_conf/controllers/tests/test_chooser.py
+++ b/console_conf/controllers/tests/test_chooser.py
@@ -148,9 +148,10 @@ class TestChooserController(unittest.TestCase):
         # go back now
         c.back()
         c.ui.set_body.assert_called_with("current")
+        c.ui.set_body.reset_mock()
         # nothing
         c.back()
-        c.ui.set_body.not_called()
+        c.ui.set_body.assert_not_called()
 
     @mock.patch(
         "console_conf.controllers.chooser.ChooserCurrentSystemView",
@@ -169,7 +170,7 @@ class TestChooserController(unittest.TestCase):
         self.assertEqual(v, "current")
         # going back does nothing
         c.back()
-        c.ui.set_body.not_called()
+        c.ui.set_body.assert_not_called()
 
     @mock.patch(
         "console_conf.controllers.chooser.ChooserCurrentSystemView",
diff --git a/subiquity/server/tests/test_controller.py b/subiquity/server/tests/test_controller.py
index 89592aa7..84b37754 100644
--- a/subiquity/server/tests/test_controller.py
+++ b/subiquity/server/tests/test_controller.py
@@ -83,7 +83,7 @@ class TestController(SubiTestCase):
         exception = ctx.exception
 
         # Assert error section is based on autoinstall_key
-        self.assertEquals(exception.owner, "some-key")
+        self.assertEqual(exception.owner, "some-key")
 
         # Assert apport report is not created
         # This only checks that controllers do not manually create an apport