Backported to 2.3.

This should not be backported to 2.3, as it might break backwards
compatibility.

and test_support.run_classtests() into run_unittest()
and use it wherever possible.

Also don't use "from test.test_support import ...", but
"from test import test_support" in a few spots.

From SF patch #662807.

Set the limit for the number of open files to 32 if platform==mac.

- assertRaises() wasn't being called correctly
- test_warning() no longer applies

other tests to generate warning when they didn't before.  In
particular, this cancels not only filters set by -W, but also from
test.regrtest.

of dummy_test_TemporaryFile class; when NamedTemporaryFile and
TemporaryFile are the same, simply don't add a test suite for
TemporaryFile.

Also, don't call gettempdir() in the default expression for the 'dir'
argument to various functions; use 'dir=None' for the default and
insert 'if dir is None: dir = gettemptir()' in the bodies.  That way
the work done by gettempdir is postponed until needed.

subprocess that does the right checks.  This now works on Windows as
well.

allow that many open files per process.  I don't see that 1000 makes
any difference for the test.

on Win32, so tests that assume there are such distinctions can't
pass.  Fiddled them to work.

rewrite, by Zack Weinberg).  This replaces most code in tempfile.py
(please review!!!) and adds extensive unit tests for it.

This will cause some warnings in the test suite; I'll check those in
soon, and also the docs.

Ensure that a tempfile can be closed any number of times without error.
This wasn't true on Windows.