test_subprocess.py 文件源码

def test_surrogates_error_message(self):
        def prepare():
            raise ValueError("surrogate:\uDCff")

        try:
            subprocess.call(
                [sys.executable, "-c", "pass"],
                preexec_fn=prepare)
        except ValueError as err:
            # Pure Python implementations keeps the message
            self.assertIsNone(subprocess._posixsubprocess)
            self.assertEqual(str(err), "surrogate:\uDCff")
        except subprocess.SubprocessError as err:
            # _posixsubprocess uses a default message
            self.assertIsNotNone(subprocess._posixsubprocess)
            self.assertEqual(str(err), "Exception occurred in preexec_fn.")
        else:
            self.fail("Expected ValueError or subprocess.SubprocessError")