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As of: changeset: 78843:8ff2f4634ed8
date: Sun Sep 02 16:37:09 2012 -0400
I am getting this failure:
$ ./python.exe -m test -v -u curses test_curses
== CPython 3.3.0rc1+ (default:8ff2f4634ed8, Sep 2 2012, 16:02:43) [GCC 4.2.1 Compatible Apple Clang 3.1 (tags/Apple/clang-318.0.58)]
== Darwin-11.4.0-x86_64-i386-64bit little-endian
== .../build/test_python_17427
Testing with flags: sys.flags(debug=0, inspect=0, interactive=0, optimize=0, dont_write_bytecode=0, no_user_site=0, no_site=0, ignore_environment=0, verbose=0, bytes_warning=0, quiet=0, hash_randomization=1)
[1/1] test_curses
test test_curses crashed -- Traceback (most recent call last):
 File ".../Lib/test/regrtest.py", line 1221, in runtest_inner
 test_runner()
 File ".../Lib/test/test_curses.py", line 336, in test_main
 main(stdscr)
 File ".../Lib/test/test_curses.py", line 322, in main
 test_unget_wch(stdscr)
 File ".../Lib/test/test_curses.py", line 283, in test_unget_wch
 raise AssertionError("%r != %r" % (read, ch))
AssertionError: -61 != 'é'
Looks like this may be related to issue 15785.

This is a duplicate of Issue15037. test_unget_wch fails when linked with ncurses versions earlier than 5.8, which is the case with the Apple-supplied versions of ncurses in OS X versions through 10.8. (The python.org OS X installers for Python 3.3.x link with their own copy of libncursesw 5.9 to avoid this problem.)

Okay, thanks, Ned. Out of curiosity, why is the stack trace here different from the one posted on that issue?

Different version of libncurses, different compiler and run time, different version and build options of Python 3.3, etc. The bug in ncurses causes junk to be stored and/or returned. In the one case, the junk triggered an overflow error, in the other, no overflow but still junk.