Use message of test assert function instead of print()

This makes it possible to silence the test output with normal unittest
settings (e.g. command line parameters).

1 files changed, 4 insertions, 7 deletions

diff --git a/tests/settings/manager_test.py b/tests/settings/manager_test.py
index eb2f37fd..67c2a239 100644
--- a/tests/settings/manager_test.py
+++ b/tests/settings/manager_test.py
@@ -108,13 +108,10 @@ class TestSettingsManager(unittest.TestCase):
                 if all([s in msg for s in unknown_settings]):
                     success = True
                     break
-            else:
-                print('Could not find all unknown settings in logging.info.\n'
-                      'Unknown settings:')
-                print(unknown_settings)
-                print('Calls to mocked logging.info:')
-                print(mock_logger.info.call_args_list)
-        self.assertTrue(success)
+        self.assertTrue(success, msg='Could not find all unknown settings in '
+                        'logging.info.\nUnknown settings:\n{}\nCalls to mocked'
+                        ' logging.info:\n{}'.format(
+                            unknown_settings, mock_logger.info.call_args_list))
 
     def test_read_notmuch_config_doesnt_exist(self):
         with tempfile.NamedTemporaryFile(delete=False) as f: