Issue #27922: IDLE tests no longer flash tk widgets (Merge 3.5).

Lib/idlelib/idle_test/test_config_key.py

@@ -14,6 +14,7 @@ class GetKeysTest(unittest.TestCase):
     @classmethod
     def setUpClass(cls):
         cls.root = Tk()
+        cls.root.withdraw()
 
     @classmethod
     def tearDownClass(cls):

Lib/idlelib/idle_test/test_configdialog.py

@@ -14,6 +14,7 @@ class ConfigDialogTest(unittest.TestCase):
     @classmethod
     def setUpClass(cls):
         cls.root = Tk()
+        cls.root.withdraw()
 
     @classmethod
     def tearDownClass(cls):

Lib/idlelib/idle_test/test_editmenu.py

@@ -17,6 +17,7 @@ class PasteTest(unittest.TestCase):
     @classmethod
     def setUpClass(cls):
         cls.root = root = tk.Tk()
+        cls.root.withdraw()
         pyshell.fix_x11_paste(root)
         cls.text = tk.Text(root)
         cls.entry = tk.Entry(root)

Lib/idlelib/idle_test/test_history.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)

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)
 

Lib/idlelib/idle_test/test_macosx.py

@@ -22,6 +22,7 @@ class InitTktypeTest(unittest.TestCase):
     def setUpClass(cls):
         requires('gui')
         cls.root = tk.Tk()
+        cls.root.withdraw()
         cls.orig_platform = macosx.platform
 
     @classmethod
@@ -76,6 +77,7 @@ class SetupTest(unittest.TestCase):
     def setUpClass(cls):
         requires('gui')
         cls.root = tk.Tk()
+        cls.root.withdraw()
 
     @classmethod
     def tearDownClass(cls):

Lib/idlelib/idle_test/test_query.py

@@ -252,6 +252,7 @@ class QueryGuiTest(unittest.TestCase):
     def setUpClass(cls):
         requires('gui')
         cls.root = root = Tk()
+        cls.root.withdraw()
         cls.dialog = query.Query(root, 'TEST', 'test', _utest=True)
         cls.dialog.destroy = mock.Mock()
 
@@ -295,6 +296,7 @@ def setUpClass(cls):
 
     def test_click_section_name(self):
         root = Tk()
+        root.withdraw()
         dialog =  query.SectionName(root, 'T', 't', {'abc'}, _utest=True)
         Equal = self.assertEqual
         self.assertEqual(dialog.used_names, {'abc'})
@@ -314,6 +316,7 @@ def setUpClass(cls):
 
     def test_click_module_name(self):
         root = Tk()
+        root.withdraw()
         dialog =  query.ModuleName(root, 'T', 't', 'idlelib', _utest=True)
         self.assertEqual(dialog.text0, 'idlelib')
         self.assertEqual(dialog.entry.get(), 'idlelib')
@@ -332,6 +335,7 @@ def setUpClass(cls):
 
     def test_click_help_source(self):
         root = Tk()
+        root.withdraw()
         dialog =  query.HelpSource(root, 'T', menuitem='__test__',
                                    filepath=__file__, _utest=True)
         Equal = self.assertEqual

Lib/idlelib/idle_test/test_redirector.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

Lib/idlelib/idle_test/test_textview.py

@@ -20,15 +20,16 @@
 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 @@ def test_ok(self):
         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 ViewFunctionTest(unittest.TestCase):
@@ -76,9 +77,10 @@ def tearDownClass(cls):
         del cls.orig_error
 
     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__)
@@ -88,7 +90,7 @@ def test_view_file(self):
         self.assertIn('Test', view.textView.get('1.0', '1.end'))
         view.Ok()
 
-        # Mock showerror will be used and view_file will return None
+        # Mock showerror will be used; view_file will return None.
         testfile = os.path.join(test_dir, '../notthere.py')
         view = tv.view_file(root, 'Title', testfile, modal=False)
         self.assertIsNone(view)