From: Mikhail Efimov <efimov.mikhail@gmail.com>
Date: Mon, 20 Oct 2025 10:45:07 +0000 (+0300)
Subject: gh-139951: Test on GC collection disabled if threshold is zero (GH-140304)
X-Git-Tag: v3.15.0a2~384
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5d0abb69715b9638f26c896444643055ec2ef038;p=thirdparty%2FPython%2Fcpython.git

gh-139951: Test on GC collection disabled if threshold is zero (GH-140304)
---

diff --git a/Lib/test/test_gc.py b/Lib/test/test_gc.py
index 432890905346..70d9d009fa8b 100644
--- a/Lib/test/test_gc.py
+++ b/Lib/test/test_gc.py
@@ -1559,6 +1559,20 @@ 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):