Fix a test on py3.14 by setting NO_COLOR=1

Author: sirosen

nose2/tests/unit/test_plugin_api.py

@@ -1,3 +1,5 @@
+from unittest import mock
+
 from nose2 import events, session
 from nose2.tests._common import TestCase
 
@@ -16,7 +18,8 @@ def setUp(self):
         super(TestCase, self).setUp()
 
     def test_add_option_adds_option(self):
-        helpt = self.session.argparse.format_help()
+        with mock.patch.dict("os.environ", {"NO_COLOR": "1"}):
+            helpt = self.session.argparse.format_help()
         assert "-X, --xxx" in helpt, (
             "commandLineSwitch arg not found in help text: %s" % helpt
         )