[3.9] bpo-25130: Add calls of gc.collect() in tests to support PyPy (GH-28005). (GH-28028)

(cherry picked from commit 2a8127cafe)

Lib/tkinter/test/test_tkinter/test_images.py

@@ -77,6 +77,7 @@ class BitmapImageTest(AbstractTkTest, unittest.TestCase):
         self.assertEqual(image.height(), 16)
         self.assertIn('::img::test', self.root.image_names())
         del image
+        support.gc_collect()  # For PyPy or other GCs.
         self.assertNotIn('::img::test', self.root.image_names())
 
     def test_create_from_data(self):
@@ -91,6 +92,7 @@ class BitmapImageTest(AbstractTkTest, unittest.TestCase):
         self.assertEqual(image.height(), 16)
         self.assertIn('::img::test', self.root.image_names())
         del image
+        support.gc_collect()  # For PyPy or other GCs.
         self.assertNotIn('::img::test', self.root.image_names())
 
     def assertEqualStrList(self, actual, expected):
@@ -171,6 +173,7 @@ class PhotoImageTest(AbstractTkTest, unittest.TestCase):
         self.assertEqual(image['file'], testfile)
         self.assertIn('::img::test', self.root.image_names())
         del image
+        support.gc_collect()  # For PyPy or other GCs.
         self.assertNotIn('::img::test', self.root.image_names())
 
     def check_create_from_data(self, ext):
@@ -188,6 +191,7 @@ class PhotoImageTest(AbstractTkTest, unittest.TestCase):
         self.assertEqual(image['file'], '')
         self.assertIn('::img::test', self.root.image_names())
         del image
+        support.gc_collect()  # For PyPy or other GCs.
         self.assertNotIn('::img::test', self.root.image_names())
 
     def test_create_from_ppm_file(self):

Lib/tkinter/test/test_tkinter/test_variables.py

@@ -1,4 +1,6 @@
 import unittest
+from test import support
+
 import gc
 import tkinter
 from tkinter import (Variable, StringVar, IntVar, DoubleVar, BooleanVar, Tcl,
@@ -46,6 +48,7 @@ class TestVariable(TestBase):
         v = Variable(self.root, "sample string", "varname")
         self.assertTrue(self.info_exists("varname"))
         del v
+        support.gc_collect()  # For PyPy or other GCs.
         self.assertFalse(self.info_exists("varname"))
 
     def test_dont_unset_not_existing(self):
@@ -53,9 +56,11 @@ class TestVariable(TestBase):
         v1 = Variable(self.root, name="name")
         v2 = Variable(self.root, name="name")
         del v1
+        support.gc_collect()  # For PyPy or other GCs.
         self.assertFalse(self.info_exists("name"))
         # shouldn't raise exception
         del v2
+        support.gc_collect()  # For PyPy or other GCs.
         self.assertFalse(self.info_exists("name"))
 
     def test_equality(self):

Lib/tkinter/test/test_ttk/test_extensions.py

@@ -2,7 +2,7 @@ import sys
 import unittest
 import tkinter
 from tkinter import ttk
-from test.support import requires, run_unittest
+from test.support import requires, run_unittest, gc_collect
 from tkinter.test.support import AbstractTkTest, AbstractDefaultRootTest
 
 requires('gui')
@@ -18,6 +18,7 @@ class LabeledScaleTest(AbstractTkTest, unittest.TestCase):
         x = ttk.LabeledScale(self.root)
         var = x._variable._name
         x.destroy()
+        gc_collect()  # For PyPy or other GCs.
         self.assertRaises(tkinter.TclError, x.tk.globalgetvar, var)
 
         # manually created variable
@@ -30,6 +31,7 @@ class LabeledScaleTest(AbstractTkTest, unittest.TestCase):
         else:
             self.assertEqual(float(x.tk.globalgetvar(name)), myvar.get())
         del myvar
+        gc_collect()  # For PyPy or other GCs.
         self.assertRaises(tkinter.TclError, x.tk.globalgetvar, name)
 
         # checking that the tracing callback is properly removed
@@ -171,6 +173,7 @@ class LabeledScaleTest(AbstractTkTest, unittest.TestCase):
     def test_resize(self):
         x = ttk.LabeledScale(self.root)
         x.pack(expand=True, fill='both')
+        gc_collect()  # For PyPy or other GCs.
         x.update()
 
         width, height = x.master.winfo_width(), x.master.winfo_height()
@@ -206,6 +209,7 @@ class OptionMenuTest(AbstractTkTest, unittest.TestCase):
         optmenu.destroy()
         self.assertEqual(optmenu.tk.globalgetvar(name), var.get())
         del var
+        gc_collect()  # For PyPy or other GCs.
         self.assertRaises(tkinter.TclError, optmenu.tk.globalgetvar, name)
 
 
@@ -251,6 +255,7 @@ class OptionMenuTest(AbstractTkTest, unittest.TestCase):
 
         # check that variable is updated correctly
         optmenu.pack()
+        gc_collect()  # For PyPy or other GCs.
         optmenu['menu'].invoke(0)
         self.assertEqual(optmenu._variable.get(), items[0])
 

Lib/tkinter/test/test_ttk/test_widgets.py

@@ -1,7 +1,7 @@
 import unittest
 import tkinter
 from tkinter import ttk, TclError
-from test.support import requires
+from test.support import requires, gc_collect
 import sys
 
 from tkinter.test.test_ttk.test_functions import MockTclObj
@@ -839,6 +839,7 @@ class ScaleTest(AbstractWidgetTest, unittest.TestCase):
         self.assertEqual(conv(self.scale.get()), var.get())
         self.assertEqual(conv(self.scale.get()), max + 5)
         del var
+        gc_collect()  # For PyPy or other GCs.
 
         # the same happens with the value option
         self.scale['value'] = max + 10