commit a5d99632766b458b42f327e8bd0f82b0345c9a63
author Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Fri Aug 06 10:09:06 2021 -0700
committer GitHub <noreply@github.com> Fri Aug 06 10:09:06 2021 -0700
tree 1561e7a0ce97fbc1fd4c8b321539b248b8db64e7
parent 36a2497093f0c66c2fb1667308691561c1bbe3f4

bpo-40928: notify users running test_decimal on macOS of malloc warnings (GH-26783)


* When trying to allocate very large regions on macOS, malloc does not   fail silently. It sends a noisy error out to STDERR
* This provides a helper function to warn the user, and provides the warning for test_decimal, which consistently generates these warnings on macOS.

Co-authored-by: Łukasz Langa <lukasz@langa.pl>
(cherry picked from commit 15d3c14df32a35ac69898a7852115722e30d7857)

Co-authored-by: Jack DeVries <58614260+jdevries3133@users.noreply.github.com>

Lib/test/test_decimal.py

diff --git a/Lib/test/test_decimal.py b/Lib/test/test_decimal.py
index 058829b..28d5690 100644
--- a/Lib/test/test_decimal.py
+++ b/Lib/test/test_decimal.py
@@ -36,7 +36,8 @@
                           requires_IEEE_754, requires_docstrings,
                           requires_legacy_unicode_capi)
 from test.support import (TestFailed,
-                          run_with_locale, cpython_only)
+                          run_with_locale, cpython_only,
+                          darwin_malloc_err_warning)
 from test.support.import_helper import import_fresh_module
 from test.support import warnings_helper
 import random
@@ -44,6 +45,10 @@
 import threading
 
 
+if sys.platform == 'darwin':
+    darwin_malloc_err_warning('test_decimal')
+
+
 C = import_fresh_module('decimal', fresh=['_decimal'])
 P = import_fresh_module('decimal', blocked=['_decimal'])
 orig_sys_decimal = sys.modules['decimal']