bpo-43231: Fix test.test_curses.TestCurses.test_init_pair when running under -R

[pablogsal]

https://bugs.python.org/issue43231

[pablogsal]

Before

❯ ./python -m test -R 3:3 test_curses -uall
0:00:00 load avg: 0.94 Run tests sequentially
0:00:00 load avg: 0.94 [1/1] test_curses
beginning 6 repetitions
123456
test test_curses failed -- Traceback (most recent call last):
  File "/home/pablogsal/github/python/master/Lib/test/test_curses.py", line 47, in wrapped
    test(self, *args, **kwargs)
  File "/home/pablogsal/github/python/master/Lib/test/test_curses.py", line 966, in test_init_pair
    curses.init_pair(maxpair, 0, 0)
ValueError: Color pair is greater than COLOR_PAIRS-1 (65535).

test_curses failed

== Tests result: FAILURE ==

1 test failed:
    test_curses

Total duration: 630 ms
Tests result: FAILURE

After

❯ ./python -m test -R 3:3 test_curses -uall
0:00:00 load avg: 1.04 Run tests sequentially
0:00:00 load avg: 1.04 [1/1] test_curses
beginning 6 repetitions
123456
.

== Tests result: SUCCESS ==

1 test OK.

Total duration: 1.7 sec
Tests result: SUCCESS

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot s390x Debian 3.x has failed when building commit ab2d481.

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/49/builds/790) and take a look at the build logs.
4. Check if the failure is related to this commit (ab2d481) 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/49/builds/790

Failed tests:

• test_curses

Failed subtests:

• test_pair_content - test.test_curses.TestCurses
• test_init_pair - test.test_curses.TestCurses

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

== Tests result: FAILURE then FAILURE ==

411 tests OK.

10 slowest tests:

• test_concurrent_futures: 3 min 5 sec
• test_gdb: 1 min 33 sec
• test_multiprocessing_spawn: 1 min 31 sec
• test_unparse: 1 min 14 sec
• test_multiprocessing_forkserver: 1 min 12 sec
• test_tokenize: 1 min 9 sec
• test_peg_generator: 1 min 4 sec
• test_asyncio: 57.5 sec
• test_multiprocessing_fork: 57.2 sec
• test_capi: 56.4 sec

1 test failed:
test_curses

14 tests skipped:
test_dbm_ndbm test_devpoll test_ioctl test_kqueue test_msilib
test_ossaudiodev test_startfile test_tix test_tk test_ttk_guionly
test_winconsoleio test_winreg test_winsound test_zipfile64

1 re-run test:
test_curses

Total duration: 5 min 35 sec

Click to see traceback logs

Traceback (most recent call last):
  File "/home/dje/cpython-buildarea/3.x.edelsohn-debian-z/build/Lib/test/test_curses.py", line 47, in wrapped
    test(self, *args, **kwargs)
  File "/home/dje/cpython-buildarea/3.x.edelsohn-debian-z/build/Lib/test/test_curses.py", line 944, in test_pair_content
    maxpair = self.get_pair_limit() - 1
  File "/home/dje/cpython-buildarea/3.x.edelsohn-debian-z/build/Lib/test/test_curses.py", line 933, in get_pair_limit
    curses.init_pair(pair_limit, 0, 0)
_curses.error: init_extended_pair() returned ERR


Traceback (most recent call last):
  File "/home/dje/cpython-buildarea/3.x.edelsohn-debian-z/build/Lib/test/test_curses.py", line 47, in wrapped
    test(self, *args, **kwargs)
  File "/home/dje/cpython-buildarea/3.x.edelsohn-debian-z/build/Lib/test/test_curses.py", line 964, in test_init_pair
    maxpair = self.get_pair_limit() - 1
  File "/home/dje/cpython-buildarea/3.x.edelsohn-debian-z/build/Lib/test/test_curses.py", line 933, in get_pair_limit
    curses.init_pair(pair_limit, 0, 0)
_curses.error: init_extended_pair() returned ERR

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot s390x RHEL8 LTO + PGO 3.x has failed when building commit ab2d481.

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/442/builds/1103) and take a look at the build logs.
4. Check if the failure is related to this commit (ab2d481) 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/442/builds/1103

Failed tests:

• test_curses

Failed subtests:

• test_pair_content - test.test_curses.TestCurses
• test_init_pair - test.test_curses.TestCurses

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

== Tests result: FAILURE then FAILURE ==

410 tests OK.

10 slowest tests:

• test_concurrent_futures: 2 min 48 sec
• test_multiprocessing_spawn: 1 min 9 sec
• test_multiprocessing_forkserver: 1 min
• test_multiprocessing_fork: 52.9 sec
• test_signal: 47.1 sec
• test_asyncio: 47.0 sec
• test_io: 36.3 sec
• test_imaplib: 32.5 sec
• test_pydoc: 31.5 sec
• test_socket: 29.0 sec

1 test failed:
test_curses

15 tests skipped:
test_devpoll test_gdb test_ioctl test_kqueue test_msilib test_nis
test_ossaudiodev test_startfile test_tix test_tk test_ttk_guionly
test_winconsoleio test_winreg test_winsound test_zipfile64

1 re-run test:
test_curses

Total duration: 3 min 30 sec

Click to see traceback logs

Traceback (most recent call last):
  File "/home/dje/cpython-buildarea/3.x.edelsohn-rhel8-z.lto-pgo/build/Lib/test/test_curses.py", line 47, in wrapped
    test(self, *args, **kwargs)
  File "/home/dje/cpython-buildarea/3.x.edelsohn-rhel8-z.lto-pgo/build/Lib/test/test_curses.py", line 944, in test_pair_content
    maxpair = self.get_pair_limit() - 1
  File "/home/dje/cpython-buildarea/3.x.edelsohn-rhel8-z.lto-pgo/build/Lib/test/test_curses.py", line 933, in get_pair_limit
    curses.init_pair(pair_limit, 0, 0)
_curses.error: init_extended_pair() returned ERR


Traceback (most recent call last):
  File "/home/dje/cpython-buildarea/3.x.edelsohn-rhel8-z.lto-pgo/build/Lib/test/test_curses.py", line 47, in wrapped
    test(self, *args, **kwargs)
  File "/home/dje/cpython-buildarea/3.x.edelsohn-rhel8-z.lto-pgo/build/Lib/test/test_curses.py", line 964, in test_init_pair
    maxpair = self.get_pair_limit() - 1
  File "/home/dje/cpython-buildarea/3.x.edelsohn-rhel8-z.lto-pgo/build/Lib/test/test_curses.py", line 933, in get_pair_limit
    curses.init_pair(pair_limit, 0, 0)
_curses.error: init_extended_pair() returned ERR

[pablogsal]

Ugh, looking into these failures

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot s390x RHEL8 3.x has failed when building commit ab2d481.

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/509/builds/747) and take a look at the build logs.
4. Check if the failure is related to this commit (ab2d481) 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/509/builds/747

Failed tests:

• test_curses

Failed subtests:

• test_pair_content - test.test_curses.TestCurses
• test_init_pair - test.test_curses.TestCurses

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

== Tests result: FAILURE then FAILURE ==

411 tests OK.

10 slowest tests:

• test_concurrent_futures: 3 min 6 sec
• test_multiprocessing_spawn: 1 min 34 sec
• test_capi: 1 min 28 sec
• test_gdb: 1 min 15 sec
• test_multiprocessing_forkserver: 1 min 15 sec
• test_unparse: 1 min 12 sec
• test_peg_generator: 1 min 10 sec
• test_asyncio: 1 min 10 sec
• test_multiprocessing_fork: 1 min
• test_tokenize: 60.0 sec

1 test failed:
test_curses

14 tests skipped:
test_devpoll test_ioctl test_kqueue test_msilib test_nis
test_ossaudiodev test_startfile test_tix test_tk test_ttk_guionly
test_winconsoleio test_winreg test_winsound test_zipfile64

1 re-run test:
test_curses

Total duration: 6 min 36 sec

Click to see traceback logs

Traceback (most recent call last):
  File "/home/dje/cpython-buildarea/3.x.edelsohn-rhel8-z/build/Lib/test/test_curses.py", line 47, in wrapped
    test(self, *args, **kwargs)
  File "/home/dje/cpython-buildarea/3.x.edelsohn-rhel8-z/build/Lib/test/test_curses.py", line 964, in test_init_pair
    maxpair = self.get_pair_limit() - 1
  File "/home/dje/cpython-buildarea/3.x.edelsohn-rhel8-z/build/Lib/test/test_curses.py", line 933, in get_pair_limit
    curses.init_pair(pair_limit, 0, 0)
_curses.error: init_extended_pair() returned ERR


Traceback (most recent call last):
  File "/home/dje/cpython-buildarea/3.x.edelsohn-rhel8-z/build/Lib/test/test_curses.py", line 47, in wrapped
    test(self, *args, **kwargs)
  File "/home/dje/cpython-buildarea/3.x.edelsohn-rhel8-z/build/Lib/test/test_curses.py", line 944, in test_pair_content
    maxpair = self.get_pair_limit() - 1
  File "/home/dje/cpython-buildarea/3.x.edelsohn-rhel8-z/build/Lib/test/test_curses.py", line 933, in get_pair_limit
    curses.init_pair(pair_limit, 0, 0)
_curses.error: init_extended_pair() returned ERR

[pablogsal]

Opened #24541

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot s390x RHEL8 LTO 3.x has failed when building commit ab2d481.

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/567/builds/1382) and take a look at the build logs.
4. Check if the failure is related to this commit (ab2d481) 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/567/builds/1382

Failed tests:

• test_curses

Failed subtests:

• test_pair_content - test.test_curses.TestCurses
• test_init_pair - test.test_curses.TestCurses

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

== Tests result: FAILURE then FAILURE ==

411 tests OK.

10 slowest tests:

• test_concurrent_futures: 2 min 44 sec
• test_peg_generator: 2 min 43 sec
• test_gdb: 1 min 46 sec
• test_multiprocessing_spawn: 1 min 19 sec
• test_multiprocessing_forkserver: 1 min
• test_multiprocessing_fork: 58.4 sec
• test_signal: 48.0 sec
• test_asyncio: 45.6 sec
• test_io: 36.3 sec
• test_imaplib: 32.4 sec

1 test failed:
test_curses

14 tests skipped:
test_devpoll test_ioctl test_kqueue test_msilib test_nis
test_ossaudiodev test_startfile test_tix test_tk test_ttk_guionly
test_winconsoleio test_winreg test_winsound test_zipfile64

1 re-run test:
test_curses

Total duration: 5 min 24 sec

Click to see traceback logs

Traceback (most recent call last):
  File "/home/dje/cpython-buildarea/3.x.edelsohn-rhel8-z.lto/build/Lib/test/test_curses.py", line 47, in wrapped
    test(self, *args, **kwargs)
  File "/home/dje/cpython-buildarea/3.x.edelsohn-rhel8-z.lto/build/Lib/test/test_curses.py", line 964, in test_init_pair
    maxpair = self.get_pair_limit() - 1
  File "/home/dje/cpython-buildarea/3.x.edelsohn-rhel8-z.lto/build/Lib/test/test_curses.py", line 933, in get_pair_limit
    curses.init_pair(pair_limit, 0, 0)
_curses.error: init_extended_pair() returned ERR


Traceback (most recent call last):
  File "/home/dje/cpython-buildarea/3.x.edelsohn-rhel8-z.lto/build/Lib/test/test_curses.py", line 47, in wrapped
    test(self, *args, **kwargs)
  File "/home/dje/cpython-buildarea/3.x.edelsohn-rhel8-z.lto/build/Lib/test/test_curses.py", line 944, in test_pair_content
    maxpair = self.get_pair_limit() - 1
  File "/home/dje/cpython-buildarea/3.x.edelsohn-rhel8-z.lto/build/Lib/test/test_curses.py", line 933, in get_pair_limit
    curses.init_pair(pair_limit, 0, 0)
_curses.error: init_extended_pair() returned ERR