diff --git a/Lib/idlelib/idle_test/test_configdialog.py b/Lib/idlelib/idle_test/test_configdialog.py
index 1f14ed1f264..92891f81cd8 100644
--- a/Lib/idlelib/idle_test/test_configdialog.py
+++ b/Lib/idlelib/idle_test/test_configdialog.py
@@ -1139,6 +1139,11 @@ class GenPageTest(unittest.TestCase):
         self.page.cursor_blink_bool.invoke()
         self.assertEqual(mainpage, {'EditorWindow': {'cursor-blink': 'False'}})
 
+    def test_strip_trailing_space_on_save(self):
+        self.page.strip_trailing_space_save_bool.invoke()
+        name = 'strip-trailing-whitespace-on-save'
+        self.assertEqual(mainpage, {'EditorWindow': {name: 'False'}})
+
     def test_autocomplete_wait(self):
         self.page.auto_wait_int.delete(0, 'end')
         self.page.auto_wait_int.insert(0, '11')