From 00b1e0f7ea1523813e3d407bfdefdf55592566af Mon Sep 17 00:00:00 2001
From: Terry Jan Reedy <tjreedy@udel.edu>
Date: Wed, 31 Aug 2016 21:03:16 -0400
Subject: Issue #27922: IDLE tests no longer flash tk widgets.

---
 Lib/idlelib/idle_test/test_configdialog.py |  1 +
 Lib/idlelib/idle_test/test_editmenu.py     |  1 +
 Lib/idlelib/idle_test/test_hyperparser.py  |  1 +
 Lib/idlelib/idle_test/test_idlehistory.py  |  1 +
 Lib/idlelib/idle_test/test_textview.py     | 12 +++++++-----
 Lib/idlelib/idle_test/test_widgetredir.py  |  2 ++
 6 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/Lib/idlelib/idle_test/test_configdialog.py b/Lib/idlelib/idle_test/test_configdialog.py
index b063601..5c09790 100644
--- a/Lib/idlelib/idle_test/test_configdialog.py
+++ b/Lib/idlelib/idle_test/test_configdialog.py
@@ -15,6 +15,7 @@ class ConfigDialogTest(unittest.TestCase):
     @classmethod
     def setUpClass(cls):
         cls.root = Tk()
+        cls.root.withdraw()
         macosx._initializeTkVariantTests(cls.root)
 
     @classmethod
diff --git a/Lib/idlelib/idle_test/test_editmenu.py b/Lib/idlelib/idle_test/test_editmenu.py
index 50317a9..a258e29 100644
--- a/Lib/idlelib/idle_test/test_editmenu.py
+++ b/Lib/idlelib/idle_test/test_editmenu.py
@@ -16,6 +16,7 @@ class PasteTest(unittest.TestCase):
     @classmethod
     def setUpClass(cls):
         cls.root = root = tk.Tk()
+        root.withdraw()
         PyShell.fix_x11_paste(root)
         cls.text = tk.Text(root)
         cls.entry = tk.Entry(root)
diff --git a/Lib/idlelib/idle_test/test_hyperparser.py b/Lib/idlelib/idle_test/test_hyperparser.py
index edfc783..9ce3f2c 100644
--- a/Lib/idlelib/idle_test/test_hyperparser.py
+++ b/Lib/idlelib/idle_test/test_hyperparser.py
@@ -37,6 +37,7 @@ class HyperParserTest(unittest.TestCase):
     def setUpClass(cls):
         requires('gui')
         cls.root = Tk()
+        cls.root.withdraw()
         cls.text = Text(cls.root)
         cls.editwin = DummyEditwin(cls.text)
 
diff --git a/Lib/idlelib/idle_test/test_idlehistory.py b/Lib/idlelib/idle_test/test_idlehistory.py
index d7c3d70..6e7c6c3 100644
--- a/Lib/idlelib/idle_test/test_idlehistory.py
+++ b/Lib/idlelib/idle_test/test_idlehistory.py
@@ -68,6 +68,7 @@ class FetchTest(unittest.TestCase):
     def setUpClass(cls):
         requires('gui')
         cls.root = tk.Tk()
+        cls.root.withdraw()
 
     def setUp(self):
         self.text = text = TextWrapper(self.root)
diff --git a/Lib/idlelib/idle_test/test_textview.py b/Lib/idlelib/idle_test/test_textview.py
index 5fbb40c..5d2e600 100644
--- a/Lib/idlelib/idle_test/test_textview.py
+++ b/Lib/idlelib/idle_test/test_textview.py
@@ -20,15 +20,16 @@ from idlelib.idle_test.mock_tk import Mbox
 def setUpModule():
     global root
     root = Tk()
+    root.withdraw()
 
 def tearDownModule():
     global root
     root.update_idletasks()
-    root.destroy()  # pyflakes falsely sees root as undefined
+    root.destroy()  # Pyflakes falsely sees root as undefined.
     del root
 
 
-class TV(tv.TextViewer):  # used by TextViewTest
+class TV(tv.TextViewer):  # Used in TextViewTest.
     transient = Func()
     grab_set = Func()
     wait_window = Func()
@@ -59,8 +60,8 @@ class TextViewTest(unittest.TestCase):
         view.destroy = Func()
         view.Ok()
         self.assertTrue(view.destroy.called)
-        del view.destroy  # unmask real function
-        view.destroy
+        del view.destroy  # Unmask real function.
+        view.destroy()
 
 
 class textviewTest(unittest.TestCase):
@@ -76,9 +77,10 @@ class textviewTest(unittest.TestCase):
         del cls.orig_mbox
 
     def test_view_text(self):
-        # If modal True, tkinter will error with 'can't invoke "event" command'
+        # If modal True, get tk error 'can't invoke "event" command'.
         view = tv.view_text(root, 'Title', 'test text', modal=False)
         self.assertIsInstance(view, tv.TextViewer)
+        view.Ok()
 
     def test_view_file(self):
         test_dir = os.path.dirname(__file__)
diff --git a/Lib/idlelib/idle_test/test_widgetredir.py b/Lib/idlelib/idle_test/test_widgetredir.py
index c68dfcc..baa975d 100644
--- a/Lib/idlelib/idle_test/test_widgetredir.py
+++ b/Lib/idlelib/idle_test/test_widgetredir.py
@@ -15,6 +15,7 @@ class InitCloseTest(unittest.TestCase):
     def setUpClass(cls):
         requires('gui')
         cls.root = Tk()
+        cls.root.withdraw()
         cls.text = Text(cls.root)
 
     @classmethod
@@ -44,6 +45,7 @@ class WidgetRedirectorTest(unittest.TestCase):
     def setUpClass(cls):
         requires('gui')
         cls.root = Tk()
+        cls.root.withdraw()
         cls.text = Text(cls.root)
 
     @classmethod
-- 
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