phabricator: add support for using the vcr library to mock interactions I'll use this in an upcoming test. The decorator dancing in this is more complicated than I'd like, but it beats repeating all this code everywhere. Differential Revision: https://phab.mercurial-scm.org/D4600

keepalive: work around slight deficiency in vcr VCR's response type doesn't define the will_close attribute. Let's just have keepalive default to closing the socket if the will_close attribute is missing. Differential Revision: https://phab.mercurial-scm.org/D4599

hghave: add a checker for the vcr HTTP record/replay library I'm going to use this to write some tests of the phabricator extension. Differential Revision: https://phab.mercurial-scm.org/D4598

py3: allow run-tests.py to run on Windows This is now functional: HGMODULEPOLICY=py py -3 run-tests.py --local test-help.t --pure --view bcompare However, on this machine without a C compiler, it tries to load cext anyway, and blows up. I haven't looked into why, other than to see that it does set the environment variable. When the test exits though, I see it can't find killdaemons.py, get-with-headers.py, etc. I have no idea why these changes are needed, given that it runs on Linux. But os.system() is insisting that it take a str, and subprocess.Popen() blows up without str: Errored test-help.t: Traceback (most recent call last): File "run-tests.py", line 810, in run self.runTest() File "run-tests.py", line 858, in runTest ret, out = self._run(env) File "run-tests.py", line 1268, in _run exitcode, output = self._runcommand(cmd, env) File "run-tests.py", line 1141, in _runcommand env=env) File "C:\Program Files\Python37\lib\subprocess.py", line 756, in __init__ restore_signals, start_new_session) File "C:\Program Files\Python37\lib\subprocess.py", line 1100, in _execute_child args = list2cmdline(args) File "C:\Program Files\Python37\lib\subprocess.py", line 511, in list2cmdline needquote = (" " in arg) or ("\t" in arg) or not arg TypeError: argument of type 'int' is not iterable This is exactly how it crashes when trying to spin up a pager too. I left one instance of os.system() unchanged in _installhg(), because it doesn't get there.

py3: ensure run-tests environment is uniformly str subprocess.popen() was crashing, and when I printed out `env`, all of the keys and most of the values were str. Except these.

py3: ensure run-tests.osenvironb is actually bytes Windows doesn't have os.environb, so it was falling back to the Unicode form, and all of the accesses are trying to use bytes.