bpo-31787: Prevent refleaks when calling __init__() more than once (GH-3995)

1 files changed, 11 insertions, 0 deletions

diff --git a/Lib/test/test_property.py b/Lib/test/test_property.py
index 26b7d52..f6f8f5e 100644
--- a/Lib/test/test_property.py
+++ b/Lib/test/test_property.py
@@ -3,6 +3,7 @@
 
 import sys
 import unittest
+from test import support
 
 class PropertyBase(Exception):
     pass
@@ -173,6 +174,16 @@ class PropertyTests(unittest.TestCase):
         sub.__class__.spam.__doc__ = 'Spam'
         self.assertEqual(sub.__class__.spam.__doc__, 'Spam')
 
+    @support.refcount_test
+    def test_refleaks_in___init__(self):
+        gettotalrefcount = support.get_attribute(sys, 'gettotalrefcount')
+        fake_prop = property('fget', 'fset', 'fdel', 'doc')
+        refs_before = gettotalrefcount()
+        for i in range(100):
+            fake_prop.__init__('fget', 'fset', 'fdel', 'doc')
+        self.assertAlmostEqual(gettotalrefcount() - refs_before, 0, delta=10)
+
+
 # Issue 5890: subclasses of property do not preserve method __doc__ strings
 class PropertySub(property):
     """This is a subclass of property"""