From: Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com>
Date: Tue, 21 Oct 2025 15:44:23 +0000 (+0200)
Subject: [3.13] gh-139951: Test on GC collection disabled if threshold is zero (GH-140304... 
X-Git-Tag: v3.13.10~231
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2e2fe26fe623337a6fac82bd7701f01a2627e959;p=thirdparty%2FPython%2Fcpython.git

[3.13] gh-139951: Test on GC collection disabled if threshold is zero (GH-140304) (#140363)

gh-139951: Test on GC collection disabled if threshold is zero (GH-140304)
(cherry picked from commit 5d0abb69715b9638f26c896444643055ec2ef038)

Co-authored-by: Mikhail Efimov <efimov.mikhail@gmail.com>
---

diff --git a/Lib/test/test_gc.py b/Lib/test/test_gc.py
index 3e7dda3bac21..81577470c583 100644
--- a/Lib/test/test_gc.py
+++ b/Lib/test/test_gc.py
@@ -1524,6 +1524,20 @@ class GCTogglingTests(unittest.TestCase):
         finally:
             gc.enable()
 
+    # Ensure that setting *threshold0* to zero disables collection.
+    @gc_threshold(0)
+    def test_threshold_zero(self):
+        junk = []
+        i = 0
+        detector = GC_Detector()
+        while not detector.gc_happened:
+            i += 1
+            if i > 50000:
+                break
+            junk.append([])  # this may eventually trigger gc (if it is enabled)
+
+        self.assertEqual(i, 50001)
+
 
 class PythonFinalizationTests(unittest.TestCase):
     def test_ast_fini(self):