1 files changed, 10 insertions, 0 deletions

diff --git a/src/mailman/utilities/tests/test_import.py b/src/mailman/utilities/tests/test_import.py
index 308fa8af2..e6eb9344c 100644
--- a/src/mailman/utilities/tests/test_import.py
+++ b/src/mailman/utilities/tests/test_import.py
@@ -34,6 +34,7 @@ import unittest
 from datetime import timedelta, datetime
 from enum import Enum
 from pkg_resources import resource_filename
+from sqlalchemy.exc import IntegrityError
 from zope.component import getUtility
 
 from mailman.app.lifecycle import create_list
@@ -291,6 +292,15 @@ class TestBasicImport(unittest.TestCase):
         else:
             self.fail('Import21Error was not raised')
 
+    def test_encode_ascii_prefixes(self):
+        self._pckdict['encode_ascii_prefixes'] = 2
+        self.assertEqual(self._mlist.encode_ascii_prefixes, False)
+        try:
+            self._import()
+        except IntegrityError as e:
+            self.fail(e)
+        self.assertEqual(self._mlist.encode_ascii_prefixes, True)
+
 
 
 class TestArchiveImport(unittest.TestCase):