import copy
import os
import sys
import unittest
import pickle
import weakref
import errno
from textwrap import dedent
from test.support import (captured_stderr, check_impl_detail,
                          cpython_only, gc_collect,
                          no_tracing, script_helper,
                          SuppressCrashReport,
                          force_not_colorized)
from test.support.import_helper import import_module
from test.support.os_helper import TESTFN, unlink
from test.support.warnings_helper import check_warnings
from test import support


def test_notes(self):
    for e in [BaseException(1), Exception(2), ValueError(3)]:
        with self.subTest(e=e):
            self.assertFalse(hasattr(e, '__notes__'))
            e.add_note("My Note")
            self.assertEqual(e.__notes__, ["My Note"])

            with self.assertRaises(TypeError):
                e.add_note(42)
            self.assertEqual(e.__notes__, ["My Note"])

            e.add_note("Your Note")
            self.assertEqual(e.__notes__, ["My Note", "Your Note"])

            del e.__notes__
            self.assertFalse(hasattr(e, '__notes__'))

            e.add_note("Our Note")
            self.assertEqual(e.__notes__, ["Our Note"])

            e.__notes__ = 42
            self.assertEqual(e.__notes__, 42)

            with self.assertRaises(TypeError):
                e.add_note("will not work")
            self.assertEqual(e.__notes__, 42)