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

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* 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 15d3c14df3)

Co-authored-by: Jack DeVries <58614260+jdevries3133@users.noreply.github.com>
This commit is contained in:
Miss Islington (bot) 2021-08-06 10:09:06 -07:00 • committed by GitHub
parent 36a2497093
commit a5d9963276
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3 changed files with 26 additions and 1 deletions
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7
Lib/test/test_decimal.py
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@ -36,7 +36,8 @@ from test.support import (run_unittest, run_doctest, is_resource_enabled,
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 inspect
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']