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I noticed that 'test_curses' is not started when performing "make test" on an OSX box:
...
[ 42/369] test_curses
test_curses skipped -- sys.__stdout__ is not a tty
...
The host is a machine running OSX 10.8, fully up-to-date with patches and the current version of Xcode. 
The same thing happens when starting the testrunning in the same way as used by the test target in the Makefile:
$ ./python.exe -W default -bb -E -R -m test -r -w -j 0 -u all,-largefile,-audio,-gui test_curses
Using random seed 9471227
[1/1] test_curses
test_curses skipped -- sys.__stdout__ is not a tty
1 test skipped:
 test_curses
Those skips are all expected on darwin.

This appears to be the same issue as raised in Issue12669. Apparently it is not fixed.

the test does get run with 'make buildbottest', and then fails with a ValueError exception:
$ /Users/ronald/Projects/python/rw/default/tbuild/python.exe -W default -bb -E -R -m test -r -w -j 1 -u all -W --timeout=3600 test_curses
Using random seed 2242495
[1/1] test_curses
test test_curses crashed -- Traceback (most recent call last):
 File "/Users/ronald/Projects/python/rw/default/Lib/test/regrtest.py", line 1221, in runtest_inner
 test_runner()
 File "/Users/ronald/Projects/python/rw/default/Lib/test/test_curses.py", line 338, in test_main
 main(stdscr)
 File "/Users/ronald/Projects/python/rw/default/Lib/test/test_curses.py", line 324, in main
 test_unget_wch(stdscr)
 File "/Users/ronald/Projects/python/rw/default/Lib/test/test_curses.py", line 283, in test_unget_wch
 read = chr(read)
ValueError: chr() arg not in range(0x110000)
That might be a bug in libcurses on OSX, I haven't tested with a separate install of libcurses yet.
BTW. The patch mentioned in Issue12669 looks slightly bogus: as buildbot is a daemon it might not even have a controlling tty. With some luck a proper fix will require the explicit use of a pseudo-tty.

The "chr() arg not in range(0x110000)" from test_unget_wch is due to a bug in ncurses < 5.8; see Issue15037.

I knew the test failure looked familiar, but couldn't find the issue in the tracker.
This issue (test_curses not running with make test) is due to '-j0' in the arguments to the test runner: with -j0 the runner uses multiprocessing and the stdout and stderr of the child processes are pipes, hence both sys.stdout and sys.__stdout__ are not tty's and the test isn't started.

So this should be closed as a duplicate of issue 12669?

Yes.
I'll add a message to that issue to note that is also affects 'make test'