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diff --git a/src/mailman/utilities/tests/test_interact.py b/src/mailman/utilities/tests/test_interact.py
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+++ b/src/mailman/utilities/tests/test_interact.py
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+# Copyright (C) 2016 by the Free Software Foundation, Inc.
+#
+# This file is part of GNU Mailman.
+#
+# GNU Mailman is free software: you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option)
+# any later version.
+#
+# GNU Mailman is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with
+# GNU Mailman.  If not, see <http://www.gnu.org/licenses/>.
+
+"""Test the interact utility."""
+
+
+import sys
+import unittest
+
+from contextlib import ExitStack
+from io import StringIO
+from mailman.app.lifecycle import create_list
+from mailman.testing.helpers import hackenv
+from mailman.testing.layers import ConfigLayer
+from mailman.utilities.interact import interact
+from tempfile import NamedTemporaryFile
+from unittest.mock import patch
+
+
+class TestInteract(unittest.TestCase):
+    layer = ConfigLayer
+
+    def setUp(self):
+        resources = ExitStack()
+        self.addCleanup(resources.close)
+        self._enter = resources.enter_context
+        self._enter(patch('code.input', side_effect=EOFError))
+        self._stderr = StringIO()
+        self._enter(patch('sys.stderr', self._stderr))
+
+    def test_interact(self):
+        mlist = create_list('ant@example.com')
+        results = []
+        fp = self._enter(NamedTemporaryFile('w', encoding='utf-8'))
+        self._enter(hackenv('PYTHONSTARTUP', fp.name))
+        print('results.append(mlist.list_id)', file=fp)
+        fp.flush()
+        interact()
+        self.assertEqual(results, [mlist.list_id])
+
+    def test_interact_overrides(self):
+        create_list('ant@example.com')
+        bee = create_list('bee@example.com')
+        results = []
+        fp = self._enter(NamedTemporaryFile('w', encoding='utf-8'))
+        self._enter(hackenv('PYTHONSTARTUP', fp.name))
+        print('results.append(mlist.list_id)', file=fp)
+        fp.flush()
+        interact(overrides=dict(mlist=bee))
+        self.assertEqual(results, [bee.list_id])
+
+    def test_interact_default_banner(self):
+        self._enter(hackenv('PYTHONSTARTUP', None))
+        interact()
+        stderr = self._stderr.getvalue().splitlines()
+        banner = 'Python {} on {} '.format(sys.version, sys.platform)
+        self.assertEqual(stderr[0], banner.splitlines()[0])
+
+    def test_interact_custom_banner(self):
+        self._enter(hackenv('PYTHONSTARTUP', None))
+        interact(banner='Welcome')
+        stderr = self._stderr.getvalue().splitlines()
+        self.assertEqual(stderr[0], 'Welcome')
+
+    def test_interact_no_upframe(self):
+        upframed = False                            # noqa
+        fp = self._enter(NamedTemporaryFile('w', encoding='utf-8'))
+        self._enter(hackenv('PYTHONSTARTUP', fp.name))
+        print('print(upframed)', file=fp)
+        fp.flush()
+        interact(upframe=False, banner='')
+        lines = self._stderr.getvalue().splitlines()
+        self.assertIn("NameError: name 'upframed' is not defined", lines)
+
+    def test_interact_multiline(self):
+        # GL issue #224.
+        fp = self._enter(NamedTemporaryFile('w', encoding='utf-8'))
+        self._enter(hackenv('PYTHONSTARTUP', fp.name))
+        print('import sys', file=fp)
+        print("print('hello', file=sys.stderr)", file=fp)
+        print("print('world', file=sys.stderr)", file=fp)
+        fp.flush()
+        interact(banner='')
+        lines = self._stderr.getvalue()
+        self.assertEqual(lines, 'hello\nworld\n\n', lines)