bpo-43016: Rewrite tests for curses

[serhiy-storchaka]

https://bugs.python.org/issue43016

[miss-islington]

Thanks @serhiy-storchaka for the PR 🌮🎉.. I'm working now to backport this PR to: 3.8, 3.9.
🐍🍒⛏🤖

[miss-islington]

Sorry, @serhiy-storchaka, I could not cleanly backport this to 3.9 due to a conflict.
Please backport using cherry_picker on command line.
cherry_picker d64fd4bb5bb4fd2e3277f39d3ad99b5a8d193e1b 3.9

[miss-islington]

Sorry @serhiy-storchaka, I had trouble checking out the 3.8 backport branch.
Please backport using cherry_picker on command line.
cherry_picker d64fd4bb5bb4fd2e3277f39d3ad99b5a8d193e1b 3.8

[bedevere-bot]

GH-24399 is a backport of this pull request to the 3.9 branch.

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 Ubuntu Shared 3.x has failed when building commit d64fd4b.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/506/builds/765) and take a look at the build logs.
4. Check if the failure is related to this commit (d64fd4b) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/506/builds/765

Failed tests:

• test_curses

Failed subtests:

• test_output_character - test.test_curses.TestCurses
• test_background - test.test_curses.TestCurses

Summary of the results of the build (if available):

== Tests result: FAILURE then FAILURE ==

408 tests OK.

10 slowest tests:

• test_concurrent_futures: 5 min 3 sec
• test_unparse: 3 min 18 sec
• test_gdb: 3 min 7 sec
• test_multiprocessing_spawn: 3 min 3 sec
• test_capi: 2 min 40 sec
• test_tokenize: 2 min 38 sec
• test_peg_generator: 2 min 26 sec
• test_lib2to3: 2 min 15 sec
• test_unicodedata: 1 min 53 sec
• test_asyncio: 1 min 47 sec

1 test failed:
test_curses

17 tests skipped:
test_devpoll test_idle test_ioctl test_kqueue test_msilib
test_ossaudiodev test_startfile test_tcl test_tix test_tk
test_ttk_guionly test_ttk_textonly test_turtle test_winconsoleio
test_winreg test_winsound test_zipfile64

1 re-run test:
test_curses

Total duration: 29 min 20 sec

Click to see traceback logs

Traceback (most recent call last):
  File "/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/test/test_curses.py", line 474, in test_background
    self.assertEqual(win.getbkgd(), 0)
AssertionError: 32 != 0


Traceback (most recent call last):
  File "/srv/buildbot/buildarea/3.x.bolen-ubuntu/build/Lib/test/test_curses.py", line 249, in test_output_character
    stdscr.addch('\u20ac')
OverflowError: byte doesn't fit in chtype

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 Ubuntu Shared 3.8 has failed when building commit 7ca947e.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/360/builds/192) and take a look at the build logs.
4. Check if the failure is related to this commit (7ca947e) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/360/builds/192

Failed tests:

• test_curses

Failed subtests:

• test_output_character - test.test_curses.TestCurses
• test_background - test.test_curses.TestCurses

Summary of the results of the build (if available):

== Tests result: FAILURE then FAILURE ==

405 tests OK.

10 slowest tests:

• test_concurrent_futures: 3 min 47 sec
• test_multiprocessing_spawn: 3 min 28 sec
• test_tokenize: 2 min 42 sec
• test_gdb: 2 min 8 sec
• test_tools: 1 min 49 sec
• test_multiprocessing_forkserver: 1 min 43 sec
• test_lib2to3: 1 min 35 sec
• test_multiprocessing_fork: 1 min 29 sec
• test_asyncio: 1 min 27 sec
• test_capi: 1 min

1 test failed:
test_curses

17 tests skipped:
test_devpoll test_idle test_ioctl test_kqueue test_msilib
test_ossaudiodev test_startfile test_tcl test_tix test_tk
test_ttk_guionly test_ttk_textonly test_turtle test_winconsoleio
test_winreg test_winsound test_zipfile64

1 re-run test:
test_curses

Total duration: 23 min 7 sec

Click to see traceback logs

Traceback (most recent call last):
  File "/srv/buildbot/buildarea/3.8.bolen-ubuntu/build/Lib/test/test_curses.py", line 473, in test_background
    self.assertEqual(win.getbkgd(), 0)
AssertionError: 32 != 0


Traceback (most recent call last):
  File "/srv/buildbot/buildarea/3.8.bolen-ubuntu/build/Lib/test/test_curses.py", line 248, in test_output_character
    stdscr.addch('\u20ac')
OverflowError: byte doesn't fit in chtype