gh-65784: Add support for parametrized resource wantobjects in regrtests (GH-143570)

This allows to run Tkinter tests with the specified value of
tkinter.wantobjects, for example "-u wantobjects=0".

Author: serhiy-storchaka

Lib/test/libregrtest/cmdline.py

@@ -134,6 +134,9 @@
                 and 3.9 to test backwards compatibility. These tests
                 may take very long to complete.
 
+    wantobjects -    Allows to run Tkinter tests with the specified value of
+                     tkinter.wantobjects.
+
 To enable all resources except one, use '-uall,-<resource>'.  For
 example, to run all the tests except for the gui tests, give the
 option '-uall,-gui'.

Lib/test/libregrtest/utils.py

@@ -41,7 +41,7 @@
 # - tzdata: while needed to validate fully test_datetime, it makes
 #   test_datetime too slow (15-20 min on some buildbots) and so is disabled by
 #   default (see bpo-30822).
-RESOURCE_NAMES = ALL_RESOURCES + ('extralargefile', 'tzdata', 'xpickle')
+RESOURCE_NAMES = ALL_RESOURCES + ('extralargefile', 'tzdata', 'xpickle', 'wantobjects')
 
 
 # Types for types hints

Lib/test/test_tcl.py

@@ -817,6 +817,10 @@ def test_huge_string_builtins2(self, size):
 
 
 def setUpModule():
+    wantobjects = support.get_resource_value('wantobjects')
+    if wantobjects is not None:
+        unittest.enterModuleContext(
+            support.swap_attr(tkinter, 'wantobjects', int(wantobjects)))
     if support.verbose:
         tcl = Tcl()
         print('patchlevel =', tcl.call('info', 'patchlevel'), flush=True)

Lib/test/test_tkinter/__init__.py

@@ -22,3 +22,9 @@
 
 def load_tests(*args):
     return load_package_tests(os.path.dirname(__file__), *args)
+
+def setUpModule():
+    wantobjects = support.get_resource_value('wantobjects')
+    if wantobjects is not None:
+        unittest.enterModuleContext(
+            support.swap_attr(tkinter, 'wantobjects', int(wantobjects)))

Lib/test/test_tkinter/support.py

@@ -1,5 +1,14 @@
 import functools
 import tkinter
+import unittest
+from test import support
+
+
+def setUpModule():
+    wantobjects = support.get_resource_value('wantobjects')
+    if wantobjects is not None:
+        unittest.enterModuleContext(
+            support.swap_attr(tkinter, 'wantobjects', int(wantobjects)))
 
 class AbstractTkTest:
 
@@ -10,6 +19,8 @@ def setUpClass(cls):
         tkinter.NoDefaultRoot()
         cls.root = tkinter.Tk()
         cls.wantobjects = cls.root.wantobjects()
+        if support.is_resource_enabled('wantobjects'):
+            assert cls.wantobjects == int(support.get_resource_value('wantobjects'))
         # De-maximize main window.
         # Some window managers can maximize new windows.
         cls.root.wm_state('normal')

Lib/test/test_tkinter/test_colorchooser.py

@@ -1,6 +1,7 @@
 import unittest
 import tkinter
 from test.support import requires, swap_attr
+from test.test_tkinter.support import setUpModule  # noqa: F401
 from test.test_tkinter.support import AbstractDefaultRootTest, AbstractTkTest
 from tkinter import colorchooser
 from tkinter.colorchooser import askcolor

Lib/test/test_tkinter/test_font.py

@@ -3,6 +3,7 @@
 import tkinter
 from tkinter import font
 from test.support import requires, gc_collect, ALWAYS_EQ
+from test.test_tkinter.support import setUpModule  # noqa: F401
 from test.test_tkinter.support import AbstractTkTest, AbstractDefaultRootTest
 
 requires('gui')

Lib/test/test_tkinter/test_geometry_managers.py

@@ -4,6 +4,7 @@
 from tkinter import TclError
 from test.support import requires
 
+from test.test_tkinter.support import setUpModule  # noqa: F401
 from test.test_tkinter.support import pixels_conv
 from test.test_tkinter.widget_tests import AbstractWidgetTest
 

Lib/test/test_tkinter/test_images.py

@@ -3,6 +3,7 @@
 import tkinter
 from test import support
 from test.support import os_helper
+from test.test_tkinter.support import setUpModule  # noqa: F401
 from test.test_tkinter.support import AbstractTkTest, AbstractDefaultRootTest, requires_tk
 
 support.requires('gui')

Lib/test/test_tkinter/test_loadtk.py

@@ -3,6 +3,7 @@
 import unittest
 import test.support as test_support
 from test.support import os_helper
+from test.test_tkinter.support import setUpModule  # noqa: F401
 from tkinter import Tcl, TclError
 
 test_support.requires('gui')