1 files changed, 9 insertions, 1 deletions

diff --git a/src/mailman/testing/helpers.py b/src/mailman/testing/helpers.py
index 2ce6956b7..233b03cf8 100644
--- a/src/mailman/testing/helpers.py
+++ b/src/mailman/testing/helpers.py
@@ -35,7 +35,6 @@ from contextlib import contextmanager, suppress
 from email import message_from_string
 from httplib2 import Http
 from lazr.config import as_timedelta
-from mailman import public
 from mailman.bin.master import Loop as Master
 from mailman.config import config
 from mailman.database.transaction import transaction
@@ -46,6 +45,7 @@ from mailman.interfaces.styles import IStyleManager
 from mailman.interfaces.usermanager import IUserManager
 from mailman.runners.digest import DigestRunner
 from mailman.utilities.mailbox import Mailbox
+from public import public
 from unittest import mock
 from urllib.error import HTTPError
 from urllib.parse import urlencode
@@ -568,3 +568,11 @@ def hackenv(envar, new_value):
                 del os.environ[envar]
         else:
             os.environ[envar] = old_value
+
+
+def nose2_start_test_run_callback(plugin):
+    from mailman.testing.layers import ConfigLayer, MockAndMonkeyLayer
+    MockAndMonkeyLayer.testing_mode = True
+    if (plugin.stderr or
+            len(os.environ.get('MM_VERBOSE_TESTLOG', '').strip()) > 0):
+        ConfigLayer.stderr = True