Issue #27196: Stop 'application destroyed' warnings when running IDLE tests.

The update_idletasks solution was provided by Serhiy Storchaka.

1 files changed, 6 insertions, 3 deletions

diff --git a/Lib/idlelib/idle_test/test_parenmatch.py b/Lib/idlelib/idle_test/test_parenmatch.py
index e153952618..95cc22cf68 100644
--- a/Lib/idlelib/idle_test/test_parenmatch.py
+++ b/Lib/idlelib/idle_test/test_parenmatch.py
@@ -1,6 +1,8 @@
-"""Test idlelib.ParenMatch."""
-# This must currently be a gui test because ParenMatch methods use
-# several text methods not defined on idlelib.idle_test.mock_tk.Text.
+'''Test idlelib.ParenMatch.
+
+This must currently be a gui test because ParenMatch methods use
+several text methods not defined on idlelib.idle_test.mock_tk.Text.
+'''
 from test.support import requires
 requires('gui')
 
@@ -29,6 +31,7 @@ class ParenMatchTest(unittest.TestCase):
     @classmethod
     def tearDownClass(cls):
         del cls.text, cls.editwin
+        cls.root.update_idletasks()
         cls.root.destroy()
         del cls.root