Issue 46416: Direct invocation of `Lib/test/test_typing.py` fails

Here's the problem:

```
» ./python.exe Lib/test/test_typing.py
........................................................................................................................................................................................................s.....................................................................................................................F.........................................................................................
======================================================================
FAIL: test_special_attrs2 (__main__.SpecialAttrsTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/Users/sobolev/Desktop/cpython/Lib/test/test_typing.py", line 5068, in test_special_attrs2
    self.assertEqual(
    ^^^^^^^^^^^^^^^^^
AssertionError: '__main__' != 'test.test_typing'
- __main__
+ test.test_typing
```

I think it is a good idea to use the same hack we have in `test_enum.py`: https://github.com/python/cpython/blob/83d544b9292870eb44f6fca37df0aa351c4ef83a/Lib/test/test_enum.py#L34

```python
MODULE = ('test.test_typing', '__main__')[__name__=='__main__']
```

PR is on its way :)

New changeset 2792d6d18eab3efeb71e6397f88db86e610541f1 by Nikita Sobolev in branch 'main':
bpo-46416: Allow direct invocation of `Lib/test/test_typing.py` (GH-30641)
https://github.com/python/cpython/commit/2792d6d18eab3efeb71e6397f88db86e610541f1

New changeset eaeb99468045b863d2dd3da3e3d1c3c9c78e1254 by Nikita Sobolev in branch '3.10':
[3.10] bpo-46416: Allow direct invocation of `Lib/test/test_typing.py` (GH-30641) (GH-30697)
https://github.com/python/cpython/commit/eaeb99468045b863d2dd3da3e3d1c3c9c78e1254

I noticed that you have been looking into the __main__ block of test modules. Wouldn't it make more sense to just remove the __main__ and have all tests go through regrtest? Everybody should use

   ./python -m regrtest test_typing

or the Windows equivalent to run typing tests.

During this work some people have mentioned that they actually use
`'__main__'` for local debugging of tests.
I don't think that I am familiar enough with the existing workflow to make
any educated decision :)

пн, 24 янв. 2022 г. в 19:34, Christian Heimes <report@bugs.python.org>:

>
> Christian Heimes <lists@cheimes.de> added the comment:
>
> I noticed that you have been looking into the __main__ block of test
> modules. Wouldn't it make more sense to just remove the __main__ and have
> all tests go through regrtest? Everybody should use
>
>    ./python -m regrtest test_typing
>
> or the Windows equivalent to run typing tests.
>
> ----------
> nosy: +christian.heimes
>
> _______________________________________
> Python tracker <report@bugs.python.org>
> <https://bugs.python.org/issue46416>
> _______________________________________
>