Method check_stderr_none

Lib/test/test_faulthandler.py:829–837

(self)

    @contextmanager
    def check_stderr_none(self):
        stderr = sys.stderr
        try:
            sys.stderr = None
            with self.assertRaises(RuntimeError) as cm:
                yield
            self.assertEqual(str(cm.exception), "sys.stderr is None")
        finally:
            sys.stderr = stderr

    def test_stderr_None(self):
        # Issue #21497: provide a helpful error if sys.stderr is None,