Issue #29392: Prevent crash when passing invalid arguments into msvcrt module.

1 files changed, 4 insertions, 2 deletions

diff --git a/Lib/idlelib/idle_test/test_autoexpand.py b/Lib/idlelib/idle_test/test_autoexpand.py
index d2a3156dca..ae8186cdc4 100644
--- a/Lib/idlelib/idle_test/test_autoexpand.py
+++ b/Lib/idlelib/idle_test/test_autoexpand.py
@@ -1,9 +1,9 @@
-"""Unit tests for idlelib.AutoExpand"""
+"""Unit tests for idlelib.autoexpand"""
 import unittest
 from test.support import requires
 from tkinter import Text, Tk
 #from idlelib.idle_test.mock_tk import Text
-from idlelib.AutoExpand import AutoExpand
+from idlelib.autoexpand import AutoExpand
 
 
 class Dummy_Editwin:
@@ -22,6 +22,7 @@ class AutoExpandTest(unittest.TestCase):
         else:
             cls.text = Text()
         cls.auto_expand = AutoExpand(Dummy_Editwin(cls.text))
+        cls.auto_expand.bell = lambda: None
 
     @classmethod
     def tearDownClass(cls):
@@ -137,5 +138,6 @@ class AutoExpandTest(unittest.TestCase):
         new_state = self.auto_expand.state
         self.assertNotEqual(initial_state, new_state)
 
+
 if __name__ == '__main__':
     unittest.main(verbosity=2)