[issue43016] Improve tests for curses

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

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

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ERROR: test_output_character (test.test_curses.TestCurses)
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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
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FAIL: test_background (test.test_curses.TestCurses)
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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
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status: closed -> open

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43016>
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