diff --git a/Lib/test/support/__init__.py b/Lib/test/support/__init__.py
index 80f3a04fcc6180..8c6e5547d5e717 100644
--- a/Lib/test/support/__init__.py
+++ b/Lib/test/support/__init__.py
@@ -40,6 +40,7 @@
"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)
diff --git a/Lib/test/test_array.py b/Lib/test/test_array.py
index b18467fb889d8b..e7cddf2314732d 100644
--- a/Lib/test/test_array.py
+++ b/Lib/test/test_array.py
@@ -42,9 +42,9 @@ def test_bad_constructor(self):
@support.cpython_only
def test_disallow_instantiation(self):
- # Ensure that the type disallows instantiation (bpo-43916)
- tp = type(iter(array.array('I')))
- self.assertRaises(TypeError, tp)
+ my_array = array.array("I")
+ tp = type(iter(my_array))
+ support.check_disallow_instantiation(self, tp, my_array)
@support.cpython_only
def test_immutable(self):
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