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bpo-43988: Add test.support.check_disallow_instantiation() (GH-25757)

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Erlend Egeberg Aasland 2021-05-26 16:15:27 +02:00 • committed by GitHub
parent 46db39d7bd
commit 4f725261c6
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2 changed files with 14 additions and 3 deletions
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11
Lib/test/support/__init__.py
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@ -40,6 +40,7 @@ __all__ = [
"requires_IEEE_754", "requires_zlib",
"anticipate_failure", "load_package_tests", "detect_api_mismatch",
"check__all__", "skip_if_buggy_ucrt_strfptime",
"check_disallow_instantiation",
# sys
"is_jython", "is_android", "check_impl_detail", "unix_shell",
"setswitchinterval",
@ -1982,3 +1983,13 @@ def skip_if_broken_multiprocessing_synchronize():
synchronize.Lock(ctx=None)
except OSError as exc:
raise unittest.SkipTest(f"broken multiprocessing SemLock: {exc!r}")
def check_disallow_instantiation(testcase, tp, *args, **kwds):
"""
Helper for testing types with the Py_TPFLAGS_DISALLOW_INSTANTIATION flag.
See bpo-43916.
"""
msg = f"cannot create '{tp.__module__}\.{tp.__name__}' instances"
testcase.assertRaisesRegex(TypeError, msg, tp, *args, **kwds)