run-tests: refactor the HGPORT handling code to use a constant for the max val

Simple enough, and then we don't need comments to cross-reference other areas of
code that need to be kept in sync.  Since the `_getreplacements()` list is now
partially dynamically generated and needed to change anyway, also move the one
line that was being appended separately to the list for some reason, for clarity.

tests/run-tests.py

@@ -1,4314 +1,4315
 #!/usr/bin/env python3
 #
 # run-tests.py - Run a set of tests on Mercurial
 #
 # Copyright 2006 Olivia Mackall <[e-mail]>
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
 # Modifying this script is tricky because it has many modes:
 #   - serial (default) vs parallel (-jN, N > 1)
 #   - no coverage (default) vs coverage (-c, -C, -s)
 #   - temp install (default) vs specific hg script (--with-hg, --local)
 #   - tests are a mix of shell scripts and Python scripts
 #
 # If you change this script, it is recommended that you ensure you
 # haven't broken it by running it in various modes with a representative
 # sample of test scripts.  For example:
 #
 #  1) serial, no coverage, temp install:
 #      ./run-tests.py test-s*
 #  2) serial, no coverage, local hg:
 #      ./run-tests.py --local test-s*
 #  3) serial, coverage, temp install:
 #      ./run-tests.py -c test-s*
 #  4) serial, coverage, local hg:
 #      ./run-tests.py -c --local test-s*      # unsupported
 #  5) parallel, no coverage, temp install:
 #      ./run-tests.py -j2 test-s*
 #  6) parallel, no coverage, local hg:
 #      ./run-tests.py -j2 --local test-s*
 #  7) parallel, coverage, temp install:
 #      ./run-tests.py -j2 -c test-s*          # currently broken
 #  8) parallel, coverage, local install:
 #      ./run-tests.py -j2 -c --local test-s*  # unsupported (and broken)
 #  9) parallel, custom tmp dir:
 #      ./run-tests.py -j2 --tmpdir /tmp/myhgtests
 #  10) parallel, pure, tests that call run-tests:
 #      ./run-tests.py --pure `grep -l run-tests.py *.t`
 #
 # (You could use any subset of the tests: test-s* happens to match
 # enough that it's worth doing parallel runs, few enough that it
 # completes fairly quickly, includes both shell and Python scripts, and
 # includes some scripts that run daemon processes.)
 
 
 import argparse
 import collections
 import contextlib
 import difflib
 
 import errno
 import functools
 import json
 import multiprocessing
 import os
 import platform
 import queue
 import random
 import re
 import shlex
 import shutil
 import signal
 import socket
 import subprocess
 import sys
 import sysconfig
 import tempfile
 import threading
 import time
 import unittest
 import uuid
 import xml.dom.minidom as minidom
 
 
 if sys.version_info < (3, 8, 0):
     print(
         '%s is only supported on Python 3.8+, not %s'
         % (sys.argv[0], '.'.join(str(v) for v in sys.version_info[:3]))
     )
     sys.exit(70)  # EX_SOFTWARE from `man 3 sysexit`
 
 MACOS = sys.platform == 'darwin'
 WINDOWS = os.name == r'nt'
 shellquote = shlex.quote
 
+# The number of HGPORTx ports allocated to each test.
+HGPORT_COUNT = 4
 
 processlock = threading.Lock()
 
 pygmentspresent = False
 try:  # is pygments installed
     import pygments
     import pygments.lexers as lexers
     import pygments.lexer as lexer
     import pygments.formatters as formatters
     import pygments.token as token
     import pygments.style as style
 
     if WINDOWS:
         hgpath = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
         sys.path.append(hgpath)
         try:
             from mercurial import win32  # pytype: disable=import-error
 
             # Don't check the result code because it fails on heptapod, but
             # something is able to convert to color anyway.
             win32.enablevtmode()
         finally:
             sys.path = sys.path[:-1]
 
     pygmentspresent = True
     difflexer = lexers.DiffLexer()
     terminal256formatter = formatters.Terminal256Formatter()
 except ImportError:
     pass
 
 progress_type = {}
 
 if pygmentspresent:
     _T_ERROR = token.string_to_tokentype("Token.Generic.Error")
     _T_FAILED = token.string_to_tokentype("Token.Generic.Failed")
     _T_FNAME = token.string_to_tokentype("Token.Generic.FName")
     _T_IGNORED = token.string_to_tokentype("Token.Generic.Ignored")
     _T_SKIPPED = token.string_to_tokentype("Token.Generic.Skipped")
     _T_SNAME = token.string_to_tokentype("Token.Generic.SName")
     _T_SKIPPED_DOT = token.string_to_tokentype("Token.Generic.SkippedDot")
     _T_SUCCESS = token.string_to_tokentype("Token.Generic.Success")
     _T_TIMEDOUT = token.string_to_tokentype("Token.Generic.TimedOut")
 
     class TestRunnerStyle(style.Style):
         default_style = ""
         styles = {
             _T_ERROR: '#cd00cd',
             _T_FAILED: '#7f0000',
             _T_FNAME: '#ff0000',
             _T_IGNORED: '#cdcd00',
             _T_SKIPPED: '#e5e5e5',
             _T_SNAME: '#00ffff',
             _T_SKIPPED_DOT: '#00ffff',
             _T_SUCCESS: '#00cd00',
             _T_TIMEDOUT: '#ff00ff',
         }
 
     class TestRunnerLexer(lexer.RegexLexer):
         testpattern = r'[\w-]+\.(t|py)(#[a-zA-Z0-9_\-\.]+)?'
         tokens = {
             'root': [
                 (r'^Skipped', _T_SKIPPED, 'skipped'),
                 (r'^Failed ', _T_FAILED, 'failed'),
                 (r'^ERROR: ', _T_FAILED, 'failed'),
             ],
             'skipped': [
                 (testpattern, _T_SNAME),
                 (r':.*', _T_SKIPPED),
             ],
             'failed': [
                 (testpattern, _T_FNAME),
                 (r'(:| ).*', _T_FAILED),
             ],
         }
 
     progress_type['.'] = _T_SUCCESS
     progress_type['s'] = _T_SKIPPED_DOT
     progress_type['i'] = _T_IGNORED
     progress_type['!'] = _T_FAILED
     progress_type['E'] = _T_ERROR
     progress_type['t'] = _T_TIMEDOUT
 
     class progressLexer(lexer.RegexLexer):
         testpattern = r'[\w-]+\.(t|py)(#[a-zA-Z0-9_\-\.]+)?'
         tokens = {
             'root': [
                 (r'^Skipped', _T_SKIPPED, 'skipped'),
                 (r'^Failed ', _T_FAILED, 'failed'),
                 (r'^ERROR: ', _T_FAILED, 'failed'),
             ],
             'skipped': [
                 (testpattern, _T_SNAME),
                 (r':.*', _T_SKIPPED),
             ],
             'failed': [
                 (testpattern, _T_FNAME),
                 (r'(:| ).*', _T_FAILED),
             ],
         }
 
     runnerformatter = formatters.Terminal256Formatter(style=TestRunnerStyle)
     runnerlexer = TestRunnerLexer()
 
 origenviron = os.environ.copy()
 
 
 def _sys2bytes(p):
     if p is None:
         return p
     return p.encode('utf-8')
 
 
 def _bytes2sys(p):
     if p is None:
         return p
     return p.decode('utf-8')
 
 
 original_env = os.environ.copy()
 osenvironb = getattr(os, 'environb', None)
 if osenvironb is None:
     # Windows lacks os.environb, for instance.  A proxy over the real thing
     # instead of a copy allows the environment to be updated via bytes on
     # all platforms.
     class environbytes:
         def __init__(self, strenv):
             self.__len__ = strenv.__len__
             self.clear = strenv.clear
             self._strenv = strenv
 
         def __getitem__(self, k):
             v = self._strenv.__getitem__(_bytes2sys(k))
             return _sys2bytes(v)
 
         def __setitem__(self, k, v):
             self._strenv.__setitem__(_bytes2sys(k), _bytes2sys(v))
 
         def __delitem__(self, k):
             self._strenv.__delitem__(_bytes2sys(k))
 
         def __contains__(self, k):
             return self._strenv.__contains__(_bytes2sys(k))
 
         def __iter__(self):
             return iter([_sys2bytes(k) for k in iter(self._strenv)])
 
         def get(self, k, default=None):
             v = self._strenv.get(_bytes2sys(k), _bytes2sys(default))
             return _sys2bytes(v)
 
         def pop(self, k, default=None):
             v = self._strenv.pop(_bytes2sys(k), _bytes2sys(default))
             return _sys2bytes(v)
 
     osenvironb = environbytes(os.environ)
 
 getcwdb = getattr(os, 'getcwdb')
 if not getcwdb or WINDOWS:
     getcwdb = lambda: _sys2bytes(os.getcwd())
 
 
 if WINDOWS:
     _getcwdb = getcwdb
 
     def getcwdb():
         cwd = _getcwdb()
         if re.match(b'^[a-z]:', cwd):
             # os.getcwd() is inconsistent on the capitalization of the drive
             # letter, so adjust it. see https://bugs.python.org/issue40368
             cwd = cwd[0:1].upper() + cwd[1:]
         return cwd
 
 
 # For Windows support
 wifexited = getattr(os, "WIFEXITED", lambda x: False)
 
 
 # Whether to use IPv6
 def checksocketfamily(name, port=20058):
     """return true if we can listen on localhost using family=name
 
     name should be either 'AF_INET', or 'AF_INET6'.
     port being used is okay - EADDRINUSE is considered as successful.
     """
     family = getattr(socket, name, None)
     if family is None:
         return False
     try:
         s = socket.socket(family, socket.SOCK_STREAM)
         s.bind(('localhost', port))
         s.close()
         return True
     except (socket.error, OSError) as exc:
         if exc.errno == errno.EADDRINUSE:
             return True
         elif exc.errno in (
             errno.EADDRNOTAVAIL,
             errno.EPROTONOSUPPORT,
             errno.EAFNOSUPPORT,
         ):
             return False
         else:
             raise
     else:
         return False
 
 
 # useipv6 will be set by parseargs
 useipv6 = None
 
 
 def checkportisavailable(port):
     """return true if a port seems free to bind on localhost"""
     if useipv6:
         family = socket.AF_INET6
     else:
         family = socket.AF_INET
     try:
         with contextlib.closing(socket.socket(family, socket.SOCK_STREAM)) as s:
             s.bind(('localhost', port))
         return True
     except PermissionError:
         return False
     except socket.error as exc:
         if WINDOWS and exc.errno == errno.WSAEACCES:
             return False
         if exc.errno not in (
             errno.EADDRINUSE,
             errno.EADDRNOTAVAIL,
             errno.EPROTONOSUPPORT,
         ):
             raise
     return False
 
 
 closefds = os.name == 'posix'
 
 
 def Popen4(cmd, wd, timeout, env=None):
     processlock.acquire()
     p = subprocess.Popen(
         _bytes2sys(cmd),
         shell=True,
         bufsize=-1,
         cwd=_bytes2sys(wd),
         env=env,
         close_fds=closefds,
         stdin=subprocess.PIPE,
         stdout=subprocess.PIPE,
         stderr=subprocess.STDOUT,
     )
     processlock.release()
 
     p.fromchild = p.stdout
     p.tochild = p.stdin
     p.childerr = p.stderr
 
     p.timeout = False
     if timeout:
 
         def t():
             start = time.time()
             while time.time() - start < timeout and p.returncode is None:
                 time.sleep(0.1)
             p.timeout = True
             vlog('# Timout reached for process %d' % p.pid)
             if p.returncode is None:
                 terminate(p)
 
         threading.Thread(target=t).start()
 
     return p
 
 
 if sys.executable:
     sysexecutable = sys.executable
 elif os.environ.get('PYTHONEXECUTABLE'):
     sysexecutable = os.environ['PYTHONEXECUTABLE']
 elif os.environ.get('PYTHON'):
     sysexecutable = os.environ['PYTHON']
 else:
     raise AssertionError('Could not find Python interpreter')
 
 PYTHON = _sys2bytes(sysexecutable.replace('\\', '/'))
 IMPL_PATH = b'PYTHONPATH'
 if 'java' in sys.platform:
     IMPL_PATH = b'JYTHONPATH'
 
 default_defaults = {
     'jobs': ('HGTEST_JOBS', multiprocessing.cpu_count()),
     'timeout': ('HGTEST_TIMEOUT', 360 if not WINDOWS else 360 * 4),
     'slowtimeout': ('HGTEST_SLOWTIMEOUT', 1500),
     'port': ('HGTEST_PORT', 20059),
     'shell': ('HGTEST_SHELL', 'sh'),
 }
 
 defaults = default_defaults.copy()
 
 
 def canonpath(path):
     return os.path.realpath(os.path.expanduser(path))
 
 
 def which(exe):
     # shutil.which only accept bytes from 3.8
     cmd = _bytes2sys(exe)
     real_exec = shutil.which(cmd)
     return _sys2bytes(real_exec)
 
 
 def parselistfiles(files, listtype, warn=True):
     entries = dict()
     for filename in files:
         try:
             path = os.path.expanduser(os.path.expandvars(filename))
             f = open(path, "rb")
         except FileNotFoundError:
             if warn:
                 print("warning: no such %s file: %s" % (listtype, filename))
             continue
 
         for line in f.readlines():
             line = line.split(b'#', 1)[0].strip()
             if line:
                 # Ensure path entries are compatible with os.path.relpath()
                 entries[os.path.normpath(line)] = filename
 
         f.close()
     return entries
 
 
 def parsettestcases(path):
     """read a .t test file, return a set of test case names
 
     If path does not exist, return an empty set.
     """
     cases = []
     try:
         with open(path, 'rb') as f:
             for l in f:
                 if l.startswith(b'#testcases '):
                     cases.append(sorted(l[11:].split()))
     except FileNotFoundError:
         pass
     return cases
 
 
 def getparser():
     """Obtain the OptionParser used by the CLI."""
     parser = argparse.ArgumentParser(usage='%(prog)s [options] [tests]')
 
     selection = parser.add_argument_group('Test Selection')
     selection.add_argument(
         '--allow-slow-tests',
         action='store_true',
         help='allow extremely slow tests',
     )
     selection.add_argument(
         "--blacklist",
         action="append",
         help="skip tests listed in the specified blacklist file",
     )
     selection.add_argument(
         "--shard-total",
         type=int,
         default=None,
         help="total number of shard to use (enable sharding)",
     )
     selection.add_argument(
         "--shard-index",
         type=int,
         default=None,
         help="index of this shard [1-N]",
     )
     selection.add_argument(
         "--changed",
         help="run tests that are changed in parent rev or working directory",
     )
     selection.add_argument(
         "-k", "--keywords", help="run tests matching keywords"
     )
     selection.add_argument(
         "-r", "--retest", action="store_true", help="retest failed tests"
     )
     selection.add_argument(
         "--test-list",
         action="append",
         help="read tests to run from the specified file",
     )
     selection.add_argument(
         "--whitelist",
         action="append",
         help="always run tests listed in the specified whitelist file",
     )
     selection.add_argument(
         'tests', metavar='TESTS', nargs='*', help='Tests to run'
     )
 
     harness = parser.add_argument_group('Test Harness Behavior')
     harness.add_argument(
         '--bisect-repo',
         metavar='bisect_repo',
         help=(
             "Path of a repo to bisect. Use together with " "--known-good-rev"
         ),
     )
     harness.add_argument(
         "-d",
         "--debug",
         action="store_true",
         help="debug mode: write output of test scripts to console"
         " rather than capturing and diffing it (disables timeout)",
     )
     harness.add_argument(
         "-f",
         "--first",
         action="store_true",
         help="exit on the first test failure",
     )
     harness.add_argument(
         "-i",
         "--interactive",
         action="store_true",
         help="prompt to accept changed output",
     )
     harness.add_argument(
         "-j",
         "--jobs",
         type=int,
         help="number of jobs to run in parallel"
         " (default: $%s or %d)" % defaults['jobs'],
     )
     harness.add_argument(
         "--keep-tmpdir",
         action="store_true",
         help="keep temporary directory after running tests",
     )
     harness.add_argument(
         '--known-good-rev',
         metavar="known_good_rev",
         help=(
             "Automatically bisect any failures using this "
             "revision as a known-good revision."
         ),
     )
     harness.add_argument(
         "--list-tests",
         action="store_true",
         help="list tests instead of running them",
     )
     harness.add_argument(
         "--loop", action="store_true", help="loop tests repeatedly"
     )
     harness.add_argument(
         '--random', action="store_true", help='run tests in random order'
     )
     harness.add_argument(
         '--order-by-runtime',
         action="store_true",
         help='run slowest tests first, according to .testtimes',
     )
     harness.add_argument(
         "-p",
         "--port",
         type=int,
         help="port on which servers should listen"
         " (default: $%s or %d)" % defaults['port'],
     )
     harness.add_argument(
         '--profile-runner',
         action='store_true',
         help='run statprof on run-tests',
     )
     harness.add_argument(
         "-R", "--restart", action="store_true", help="restart at last error"
     )
     harness.add_argument(
         "--runs-per-test",
         type=int,
         dest="runs_per_test",
         help="run each test N times (default=1)",
         default=1,
     )
     harness.add_argument(
         "--shell", help="shell to use (default: $%s or %s)" % defaults['shell']
     )
     harness.add_argument(
         '--showchannels', action='store_true', help='show scheduling channels'
     )
     harness.add_argument(
         "--slowtimeout",
         type=int,
         help="kill errant slow tests after SLOWTIMEOUT seconds"
         " (default: $%s or %d)" % defaults['slowtimeout'],
     )
     harness.add_argument(
         "-t",
         "--timeout",
         type=int,
         help="kill errant tests after TIMEOUT seconds"
         " (default: $%s or %d)" % defaults['timeout'],
     )
     harness.add_argument(
         "--tmpdir",
         help="run tests in the given temporary directory"
         " (implies --keep-tmpdir)",
     )
     harness.add_argument(
         "-v", "--verbose", action="store_true", help="output verbose messages"
     )
 
     hgconf = parser.add_argument_group('Mercurial Configuration')
     hgconf.add_argument(
         "--chg",
         action="store_true",
         help="install and use chg wrapper in place of hg",
     )
     hgconf.add_argument(
         "--chg-debug",
         action="store_true",
         help="show chg debug logs",
     )
     hgconf.add_argument(
         "--rhg",
         action="store_true",
         help="install and use rhg Rust implementation in place of hg",
     )
     hgconf.add_argument(
         "--pyoxidized",
         action="store_true",
         help="build the hg binary using pyoxidizer",
     )
     hgconf.add_argument("--compiler", help="compiler to build with")
     hgconf.add_argument(
         '--extra-config-opt',
         action="append",
         default=[],
         help='set the given config opt in the test hgrc',
     )
     hgconf.add_argument(
         "-l",
         "--local",
         action="store_true",
         help="shortcut for --with-hg=<testdir>/../hg, "
         "--with-rhg=<testdir>/../rust/target/release/rhg if --rhg is set, "
         "and --with-chg=<testdir>/../contrib/chg/chg if --chg is set",
     )
     hgconf.add_argument(
         "--ipv6",
         action="store_true",
         help="prefer IPv6 to IPv4 for network related tests",
     )
     hgconf.add_argument(
         "--hg-wheel",
         default=None,
         metavar="WHEEL_PATH",
         dest="wheel",
         help="install mercurial from the given wheel",
     )
     hgconf.add_argument(
         "--pure",
         action="store_true",
         help="use pure Python code instead of C extensions",
     )
     hgconf.add_argument(
         "--rust",
         action="store_true",
         help="use Rust code alongside C extensions",
     )
     hgconf.add_argument(
         "--no-rust",
         action="store_true",
         help="do not use Rust code even if compiled",
     )
     hgconf.add_argument(
         "--with-chg",
         metavar="CHG",
         help="use specified chg wrapper in place of hg",
     )
     hgconf.add_argument(
         "--with-rhg",
         metavar="RHG",
         help="use specified rhg Rust implementation in place of hg",
     )
     hgconf.add_argument(
         "--with-hg",
         metavar="HG",
         help="test using specified hg script rather than a "
         "temporary installation",
     )
 
     reporting = parser.add_argument_group('Results Reporting')
     reporting.add_argument(
         "-C",
         "--annotate",
         action="store_true",
         help="output files annotated with coverage",
     )
     reporting.add_argument(
         "--color",
         choices=["always", "auto", "never"],
         default=os.environ.get('HGRUNTESTSCOLOR', 'auto'),
         help="colorisation: always|auto|never (default: auto)",
     )
     reporting.add_argument(
         "-c",
         "--cover",
         action="store_true",
         help="print a test coverage report",
     )
     reporting.add_argument(
         '--exceptions',
         action='store_true',
         help='log all exceptions and generate an exception report',
     )
     reporting.add_argument(
         "-H",
         "--htmlcov",
         action="store_true",
         help="create an HTML report of the coverage of the files",
     )
     reporting.add_argument(
         "--json",
         action="store_true",
         help="store test result data in 'report.json' file",
     )
     reporting.add_argument(
         "--outputdir",
         help="directory to write error logs to (default=test directory)",
     )
     reporting.add_argument(
         "-n", "--nodiff", action="store_true", help="skip showing test changes"
     )
     reporting.add_argument(
         "-S",
         "--noskips",
         action="store_true",
         help="don't report skip tests verbosely",
     )
     reporting.add_argument(
         "--time", action="store_true", help="time how long each test takes"
     )
     reporting.add_argument("--view", help="external diff viewer")
     reporting.add_argument(
         "--xunit", help="record xunit results at specified path"
     )
 
     for option, (envvar, default) in defaults.items():
         defaults[option] = type(default)(os.environ.get(envvar, default))
     parser.set_defaults(**defaults)
 
     return parser
 
 
 def parseargs(args, parser):
     """Parse arguments with our OptionParser and validate results."""
     options = parser.parse_args(args)
 
     # jython is always pure
     if 'java' in sys.platform or '__pypy__' in sys.modules:
         options.pure = True
 
     if platform.python_implementation() != 'CPython' and options.rust:
         parser.error('Rust extensions are only available with CPython')
 
     if options.pure and options.rust:
         parser.error('--rust cannot be used with --pure')
 
     if options.rust and options.no_rust:
         parser.error('--rust cannot be used with --no-rust')
 
     if options.local:
         if options.with_hg or options.with_rhg or options.with_chg:
             parser.error(
                 '--local cannot be used with --with-hg or --with-rhg or --with-chg'
             )
         if options.pyoxidized:
             parser.error('--pyoxidized does not work with --local (yet)')
         testdir = os.path.dirname(_sys2bytes(canonpath(sys.argv[0])))
         reporootdir = os.path.dirname(testdir)
         pathandattrs = [(b'hg', 'with_hg')]
         if options.chg:
             pathandattrs.append((b'contrib/chg/chg', 'with_chg'))
         if options.rhg:
             pathandattrs.append((b'rust/target/release/rhg', 'with_rhg'))
         for relpath, attr in pathandattrs:
             binpath = os.path.join(reporootdir, relpath)
             if not (WINDOWS or os.access(binpath, os.X_OK)):
                 parser.error(
                     '--local specified, but %r not found or '
                     'not executable' % binpath
                 )
             setattr(options, attr, _bytes2sys(binpath))
 
     if options.with_hg:
         options.with_hg = canonpath(_sys2bytes(options.with_hg))
         if not (
             os.path.isfile(options.with_hg)
             and os.access(options.with_hg, os.X_OK)
         ):
             parser.error('--with-hg must specify an executable hg script')
         if os.path.basename(options.with_hg) not in [b'hg', b'hg.exe']:
             msg = 'warning: --with-hg should specify an hg script, not: %s\n'
             msg %= _bytes2sys(os.path.basename(options.with_hg))
             sys.stderr.write(msg)
             sys.stderr.flush()
 
     if (options.chg or options.with_chg) and WINDOWS:
         parser.error('chg does not work on %s' % os.name)
     if (options.rhg or options.with_rhg) and WINDOWS:
         parser.error('rhg does not work on %s' % os.name)
     if options.pyoxidized and not (MACOS or WINDOWS):
         parser.error('--pyoxidized is currently macOS and Windows only')
     if options.with_chg:
         options.chg = False  # no installation to temporary location
         options.with_chg = canonpath(_sys2bytes(options.with_chg))
         if not (
             os.path.isfile(options.with_chg)
             and os.access(options.with_chg, os.X_OK)
         ):
             parser.error('--with-chg must specify a chg executable')
     if options.with_rhg:
         options.rhg = False  # no installation to temporary location
         options.with_rhg = canonpath(_sys2bytes(options.with_rhg))
         if not (
             os.path.isfile(options.with_rhg)
             and os.access(options.with_rhg, os.X_OK)
         ):
             parser.error('--with-rhg must specify a rhg executable')
     if options.chg and options.with_hg:
         # chg shares installation location with hg
         parser.error(
             '--chg does not work when --with-hg is specified '
             '(use --with-chg instead)'
         )
     if options.rhg and options.with_hg:
         # rhg shares installation location with hg
         parser.error(
             '--rhg does not work when --with-hg is specified '
             '(use --with-rhg instead)'
         )
     if options.rhg and options.chg:
         parser.error('--rhg and --chg do not work together')
 
     if options.color == 'always' and not pygmentspresent:
         sys.stderr.write(
             'warning: --color=always ignored because '
             'pygments is not installed\n'
         )
 
     if options.bisect_repo and not options.known_good_rev:
         parser.error("--bisect-repo cannot be used without --known-good-rev")
 
     global useipv6
     if options.ipv6:
         useipv6 = checksocketfamily('AF_INET6')
     else:
         # only use IPv6 if IPv4 is unavailable and IPv6 is available
         useipv6 = (not checksocketfamily('AF_INET')) and checksocketfamily(
             'AF_INET6'
         )
 
     options.anycoverage = options.cover or options.annotate or options.htmlcov
     if options.anycoverage:
         try:
             import coverage
 
             coverage.__version__  # silence unused import warning
         except ImportError:
             parser.error('coverage options now require the coverage package')
 
     if options.anycoverage and options.local:
         # this needs some path mangling somewhere, I guess
         parser.error(
             "sorry, coverage options do not work when --local " "is specified"
         )
 
     if options.anycoverage and options.with_hg:
         parser.error(
             "sorry, coverage options do not work when --with-hg " "is specified"
         )
 
     global verbose
     if options.verbose:
         verbose = ''
 
     if options.tmpdir:
         options.tmpdir = canonpath(options.tmpdir)
 
     if options.jobs < 1:
         parser.error('--jobs must be positive')
     if options.interactive and options.debug:
         parser.error("-i/--interactive and -d/--debug are incompatible")
     if options.debug:
         if options.timeout != defaults['timeout']:
             sys.stderr.write('warning: --timeout option ignored with --debug\n')
         if options.slowtimeout != defaults['slowtimeout']:
             sys.stderr.write(
                 'warning: --slowtimeout option ignored with --debug\n'
             )
         options.timeout = 0
         options.slowtimeout = 0
 
     if options.blacklist:
         options.blacklist = parselistfiles(options.blacklist, 'blacklist')
     if options.whitelist:
         options.whitelisted = parselistfiles(options.whitelist, 'whitelist')
     else:
         options.whitelisted = {}
 
     if options.showchannels:
         options.nodiff = True
 
     if options.shard_total is not None:
         if options.shard_index is None:
             parser.error("--shard-total requires --shard-index to be set")
 
     if options.shard_index is not None:
         if options.shard_total is None:
             parser.error("--shard-index requires --shard-total to be set")
         elif options.shard_index <= 0:
             msg = "--shard-index must be > 0 (%d)"
             msg %= options.shard_index
             parser.error(msg)
         elif options.shard_index > options.shard_total:
             msg = (
                 "--shard-index must be <= than --shard-total (%d not in [1,%d])"
             )
             msg %= (options.shard_index, options.shard_total)
             parser.error(msg)
 
     if options.shard_total is not None and options.order_by_runtime:
         msg = "cannot use --order-by-runtime when sharding"
         parser.error(msg)
 
     if options.shard_total is not None and options.random:
         msg = "cannot use --random when sharding"
         parser.error(msg)
 
     return options
 
 
 def rename(src, dst):
     """Like os.rename(), trade atomicity and opened files friendliness
     for existing destination support.
     """
     shutil.copy(src, dst)
     os.remove(src)
 
 
 def makecleanable(path):
     """Try to fix directory permission recursively so that the entire tree
     can be deleted"""
     for dirpath, dirnames, _filenames in os.walk(path, topdown=True):
         for d in dirnames:
             p = os.path.join(dirpath, d)
             try:
                 os.chmod(p, os.stat(p).st_mode & 0o777 | 0o700)  # chmod u+rwx
             except OSError:
                 pass
 
 
 _unified_diff = functools.partial(difflib.diff_bytes, difflib.unified_diff)
 
 
 def getdiff(expected, output, ref, err):
     servefail = False
     lines = []
     for line in _unified_diff(expected, output, ref, err):
         if line.startswith(b'+++') or line.startswith(b'---'):
             line = line.replace(b'\\', b'/')
             if line.endswith(b' \n'):
                 line = line[:-2] + b'\n'
         lines.append(line)
         if not servefail and line.startswith(
             b'+  abort: child process failed to start'
         ):
             servefail = True
 
     return servefail, lines
 
 
 verbose = False
 
 
 def vlog(*msg):
     """Log only when in verbose mode."""
     if verbose is False:
         return
 
     return log(*msg)
 
 
 # Bytes that break XML even in a CDATA block: control characters 0-31
 # sans \t, \n and \r
 CDATA_EVIL = re.compile(br"[\000-\010\013\014\016-\037]")
 
 # Match feature conditionalized output lines in the form, capturing the feature
 # list in group 2, and the preceeding line output in group 1:
 #
 #   output..output (feature !)\n
 optline = re.compile(br'(.*) \((.+?) !\)\n$')
 
 
 def cdatasafe(data):
     """Make a string safe to include in a CDATA block.
 
     Certain control characters are illegal in a CDATA block, and
     there's no way to include a ]]> in a CDATA either. This function
     replaces illegal bytes with ? and adds a space between the ]] so
     that it won't break the CDATA block.
     """
     return CDATA_EVIL.sub(b'?', data).replace(b']]>', b'] ]>')
 
 
 def log(*msg):
     """Log something to stdout.
 
     Arguments are strings to print.
     """
     with iolock:
         if verbose:
             print(verbose, end=' ')
         for m in msg:
             print(m, end=' ')
         print()
         sys.stdout.flush()
 
 
 def highlightdiff(line, color):
     if not color:
         return line
     assert pygmentspresent
     return pygments.highlight(
         line.decode('latin1'), difflexer, terminal256formatter
     ).encode('latin1')
 
 
 def highlightmsg(msg, color):
     if not color:
         return msg
     assert pygmentspresent
     return pygments.highlight(msg, runnerlexer, runnerformatter)
 
 
 def highlight_progress(progress, color):
     if not color:
         return progress
     assert pygmentspresent
     token = progress_type.get(progress)
     if token is None:
         return progress
     style = runnerformatter.style_string.get(str(token))
     if style is None:
         return progress
     else:
         return style[0] + progress + style[1]
 
 
 def terminate(proc):
     """Terminate subprocess"""
     vlog('# Terminating process %d' % proc.pid)
     try:
         proc.terminate()
     except OSError:
         pass
 
 
 def killdaemons(pidfile):
     import killdaemons as killmod
 
     return killmod.killdaemons(pidfile, tryhard=False, remove=True, logfn=vlog)
 
 
 # sysconfig is not thread-safe (https://github.com/python/cpython/issues/92452)
 sysconfiglock = threading.Lock()
 
 
 class Test(unittest.TestCase):
     """Encapsulates a single, runnable test.
 
     While this class conforms to the unittest.TestCase API, it differs in that
     instances need to be instantiated manually. (Typically, unittest.TestCase
     classes are instantiated automatically by scanning modules.)
     """
 
     # Status code reserved for skipped tests (used by hghave).
     SKIPPED_STATUS = 80
 
     def __init__(
         self,
         path,
         outputdir,
         tmpdir,
         keeptmpdir=False,
         debug=False,
         first=False,
         timeout=None,
         startport=None,
         extraconfigopts=None,
         shell=None,
         hgcommand=None,
         slowtimeout=None,
         usechg=False,
         chgdebug=False,
         useipv6=False,
     ):
         """Create a test from parameters.
 
         path is the full path to the file defining the test.
 
         tmpdir is the main temporary directory to use for this test.
 
         keeptmpdir determines whether to keep the test's temporary directory
         after execution. It defaults to removal (False).
 
         debug mode will make the test execute verbosely, with unfiltered
         output.
 
         timeout controls the maximum run time of the test. It is ignored when
         debug is True. See slowtimeout for tests with #require slow.
 
         slowtimeout overrides timeout if the test has #require slow.
 
         startport controls the starting port number to use for this test. Each
         test will reserve 3 port numbers for execution. It is the caller's
         responsibility to allocate a non-overlapping port range to Test
         instances.
 
         extraconfigopts is an iterable of extra hgrc config options. Values
         must have the form "key=value" (something understood by hgrc). Values
         of the form "foo.key=value" will result in "[foo] key=value".
 
         shell is the shell to execute tests in.
         """
         if timeout is None:
             timeout = defaults['timeout']
         if startport is None:
             startport = defaults['port']
         if slowtimeout is None:
             slowtimeout = defaults['slowtimeout']
         self.path = path
         self.relpath = os.path.relpath(path)
         self.bname = os.path.basename(path)
         self.name = _bytes2sys(self.bname)
         self._testdir = os.path.dirname(path)
         self._outputdir = outputdir
         self._tmpname = os.path.basename(path)
         self.errpath = os.path.join(self._outputdir, b'%s.err' % self.bname)
 
         self._threadtmp = tmpdir
         self._keeptmpdir = keeptmpdir
         self._debug = debug
         self._first = first
         self._timeout = timeout
         self._slowtimeout = slowtimeout
         self._startport = startport
         self._extraconfigopts = extraconfigopts or []
         self._shell = _sys2bytes(shell)
         self._hgcommand = hgcommand or b'hg'
         self._usechg = usechg
         self._chgdebug = chgdebug
         self._useipv6 = useipv6
 
         self._aborted = False
         self._daemonpids = []
         self._finished = None
         self._ret = None
         self._out = None
         self._skipped = None
         self._testtmp = None
         self._chgsockdir = None
 
         self._refout = self.readrefout()
 
     def readrefout(self):
         """read reference output"""
         # If we're not in --debug mode and reference output file exists,
         # check test output against it.
         if self._debug:
             return None  # to match "out is None"
         elif os.path.exists(self.refpath):
             with open(self.refpath, 'rb') as f:
                 return f.read().splitlines(True)
         else:
             return []
 
     # needed to get base class __repr__ running
     @property
     def _testMethodName(self):
         return self.name
 
     def __str__(self):
         return self.name
 
     def shortDescription(self):
         return self.name
 
     def setUp(self):
         """Tasks to perform before run()."""
         self._finished = False
         self._ret = None
         self._out = None
         self._skipped = None
 
         try:
             os.mkdir(self._threadtmp)
         except FileExistsError:
             pass
 
         name = self._tmpname
         self._testtmp = os.path.join(self._threadtmp, name)
         os.mkdir(self._testtmp)
 
         # Remove any previous output files.
         if os.path.exists(self.errpath):
             try:
                 os.remove(self.errpath)
             except FileNotFoundError:
                 # We might have raced another test to clean up a .err file,
                 # so ignore FileNotFoundError when removing a previous .err
                 # file.
                 pass
 
         if self._usechg:
             self._chgsockdir = os.path.join(
                 self._threadtmp, b'%s.chgsock' % name
             )
             os.mkdir(self._chgsockdir)
 
     def run(self, result):
         """Run this test and report results against a TestResult instance."""
         # This function is extremely similar to unittest.TestCase.run(). Once
         # we require Python 2.7 (or at least its version of unittest), this
         # function can largely go away.
         self._result = result
         result.startTest(self)
         try:
             try:
                 self.setUp()
             except (KeyboardInterrupt, SystemExit):
                 self._aborted = True
                 raise
             except Exception:
                 result.addError(self, sys.exc_info())
                 return
 
             success = False
             try:
                 self.runTest()
             except KeyboardInterrupt:
                 self._aborted = True
                 raise
             except unittest.SkipTest as e:
                 result.addSkip(self, str(e))
                 # The base class will have already counted this as a
                 # test we "ran", but we want to exclude skipped tests
                 # from those we count towards those run.
                 result.testsRun -= 1
             except self.failureException as e:
                 # This differs from unittest in that we don't capture
                 # the stack trace. This is for historical reasons and
                 # this decision could be revisited in the future,
                 # especially for PythonTest instances.
                 if result.addFailure(self, str(e)):
                     success = True
             except Exception:
                 result.addError(self, sys.exc_info())
             else:
                 success = True
 
             try:
                 self.tearDown()
             except (KeyboardInterrupt, SystemExit):
                 self._aborted = True
                 raise
             except Exception:
                 result.addError(self, sys.exc_info())
                 success = False
 
             if success:
                 result.addSuccess(self)
         finally:
             result.stopTest(self, interrupted=self._aborted)
 
     def runTest(self):
         """Run this test instance.
 
         This will return a tuple describing the result of the test.
         """
         env = self._getenv()
         self._genrestoreenv(env)
         self._daemonpids.append(env['DAEMON_PIDS'])
         self._createhgrc(env['HGRCPATH'])
 
         vlog('# Test', self.name)
 
         ret, out = self._run(env)
         self._finished = True
         self._ret = ret
         self._out = out
 
         def describe(ret):
             if ret < 0:
                 return 'killed by signal: %d' % -ret
             return 'returned error code %d' % ret
 
         self._skipped = False
 
         if ret == self.SKIPPED_STATUS:
             if out is None:  # Debug mode, nothing to parse.
                 missing = ['unknown']
                 failed = None
             else:
                 missing, failed = TTest.parsehghaveoutput(out)
 
             if not missing:
                 missing = ['skipped']
 
             if failed:
                 self.fail('hg have failed checking for %s' % failed[-1])
             else:
                 self._skipped = True
                 raise unittest.SkipTest(missing[-1])
         elif ret == 'timeout':
             self.fail('timed out')
         elif ret is False:
             self.fail('no result code from test')
         elif out != self._refout:
             # Diff generation may rely on written .err file.
             if (
                 (ret != 0 or out != self._refout)
                 and not self._skipped
                 and not self._debug
             ):
                 with open(self.errpath, 'wb') as f:
                     for line in out:
                         f.write(line)
 
             # The result object handles diff calculation for us.
             with firstlock:
                 if self._result.addOutputMismatch(self, ret, out, self._refout):
                     # change was accepted, skip failing
                     return
                 if self._first:
                     global firsterror
                     firsterror = True
 
             if ret:
                 msg = 'output changed and ' + describe(ret)
             else:
                 msg = 'output changed'
 
             self.fail(msg)
         elif ret:
             self.fail(describe(ret))
 
     def tearDown(self):
         """Tasks to perform after run()."""
         for entry in self._daemonpids:
             killdaemons(entry)
         self._daemonpids = []
 
         if self._keeptmpdir:
             log(
                 '\nKeeping testtmp dir: %s\nKeeping threadtmp dir: %s'
                 % (
                     _bytes2sys(self._testtmp),
                     _bytes2sys(self._threadtmp),
                 )
             )
         else:
             try:
                 shutil.rmtree(self._testtmp)
             except OSError:
                 # unreadable directory may be left in $TESTTMP; fix permission
                 # and try again
                 makecleanable(self._testtmp)
                 shutil.rmtree(self._testtmp, True)
             shutil.rmtree(self._threadtmp, True)
 
         if self._usechg:
             # chgservers will stop automatically after they find the socket
             # files are deleted
             shutil.rmtree(self._chgsockdir, True)
 
         if (
             (self._ret != 0 or self._out != self._refout)
             and not self._skipped
             and not self._debug
             and self._out
         ):
             with open(self.errpath, 'wb') as f:
                 for line in self._out:
                     f.write(line)
 
         vlog("# Ret was:", self._ret, '(%s)' % self.name)
 
     def _run(self, env):
         # This should be implemented in child classes to run tests.
         raise unittest.SkipTest('unknown test type')
 
     def abort(self):
         """Terminate execution of this test."""
         self._aborted = True
 
     def _portmap(self, i):
         offset = b'' if i == 0 else b'%d' % i
         return (br':%d\b' % (self._startport + i), b':$HGPORT%s' % offset)
 
     def _getreplacements(self):
         """Obtain a mapping of text replacements to apply to test output.
 
         Test output needs to be normalized so it can be compared to expected
         output. This function defines how some of that normalization will
         occur.
         """
-        r = [
-            # This list should be parallel to defineport in _getenv
-            self._portmap(0),
-            self._portmap(1),
-            self._portmap(2),
-            self._portmap(3),
-            (br'([^0-9])%s' % re.escape(self._localip()), br'\1$LOCALIP'),
-            (br'\bHG_TXNID=TXN:[a-f0-9]{40}\b', br'HG_TXNID=TXN:$ID$'),
-        ]
-        r.append((self._escapepath(self._testtmp), b'$TESTTMP'))
+        r = [self._portmap(port) for port in range(HGPORT_COUNT)]
+
+        r.extend(
+            [
+                (br'([^0-9])%s' % re.escape(self._localip()), br'\1$LOCALIP'),
+                (br'\bHG_TXNID=TXN:[a-f0-9]{40}\b', br'HG_TXNID=TXN:$ID$'),
+                (self._escapepath(self._testtmp), b'$TESTTMP'),
+            ]
+        )
+
         if WINDOWS:
             # JSON output escapes backslashes in Windows paths, so also catch a
             # double-escape.
             replaced = self._testtmp.replace(b'\\', br'\\')
             r.append((self._escapepath(replaced), b'$STR_REPR_TESTTMP'))
 
         replacementfile = os.path.join(self._testdir, b'common-pattern.py')
 
         if os.path.exists(replacementfile):
             data = {}
             with open(replacementfile, mode='rb') as source:
                 # the intermediate 'compile' step help with debugging
                 code = compile(source.read(), replacementfile, 'exec')
                 exec(code, data)
                 for value in data.get('substitutions', ()):
                     if len(value) != 2:
                         msg = 'malformatted substitution in %s: %r'
                         msg %= (replacementfile, value)
                         raise ValueError(msg)
                     r.append(value)
         return r
 
     def _escapepath(self, p):
         if WINDOWS:
             return b''.join(
                 c.isalpha()
                 and b'[%s%s]' % (c.lower(), c.upper())
                 or c in b'/\\'
                 and br'[/\\]'
                 or c.isdigit()
                 and c
                 or b'\\' + c
                 for c in [p[i : i + 1] for i in range(len(p))]
             )
         else:
             return re.escape(p)
 
     def _localip(self):
         if self._useipv6:
             return b'::1'
         else:
             return b'127.0.0.1'
 
     def _genrestoreenv(self, testenv):
         """Generate a script that can be used by tests to restore the original
         environment."""
         # Put the restoreenv script inside self._threadtmp
         scriptpath = os.path.join(self._threadtmp, b'restoreenv.sh')
         testenv['HGTEST_RESTOREENV'] = _bytes2sys(scriptpath)
 
         # Only restore environment variable names that the shell allows
         # us to export.
         name_regex = re.compile('^[a-zA-Z][a-zA-Z0-9_]*$')
 
         # Do not restore these variables; otherwise tests would fail.
         reqnames = {'PYTHON', 'TESTDIR', 'TESTTMP'}
 
         with open(scriptpath, 'w') as envf:
             for name, value in origenviron.items():
                 if not name_regex.match(name):
                     # Skip environment variables with unusual names not
                     # allowed by most shells.
                     continue
                 if name in reqnames:
                     continue
                 envf.write('%s=%s\n' % (name, shellquote(value)))
 
             for name in testenv:
                 if name in origenviron or name in reqnames:
                     continue
                 envf.write('unset %s\n' % (name,))
 
     def _getenv(self):
         """Obtain environment variables to use during test execution."""
 
         def defineport(i):
             offset = '' if i == 0 else '%s' % i
             env["HGPORT%s" % offset] = '%s' % (self._startport + i)
 
         env = os.environ.copy()
         with sysconfiglock:
             env['PYTHONUSERBASE'] = sysconfig.get_config_var('userbase') or ''
         env['HGEMITWARNINGS'] = '1'
         env['TESTTMP'] = _bytes2sys(self._testtmp)
         # the FORWARD_SLASH version is useful when running `sh` on non unix
         # system (e.g. Windows)
         env['TESTTMP_FORWARD_SLASH'] = env['TESTTMP'].replace(os.sep, '/')
         uid_file = os.path.join(_bytes2sys(self._testtmp), 'UID')
         env['HGTEST_UUIDFILE'] = uid_file
         env['TESTNAME'] = self.name
         env['HOME'] = _bytes2sys(self._testtmp)
         if WINDOWS:
             env['REALUSERPROFILE'] = env['USERPROFILE']
             # py3.8+ ignores HOME: https://bugs.python.org/issue36264
             env['USERPROFILE'] = env['HOME']
         formated_timeout = _bytes2sys(b"%d" % default_defaults['timeout'][1])
         env['HGTEST_TIMEOUT_DEFAULT'] = formated_timeout
         env['HGTEST_TIMEOUT'] = _bytes2sys(b"%d" % self._timeout)
-        # This number should match portneeded in _getport
-        for port in range(4):
-            # This list should be parallel to _portmap in _getreplacements
+
+        for port in range(HGPORT_COUNT):
             defineport(port)
         env["HGRCPATH"] = _bytes2sys(os.path.join(self._threadtmp, b'.hgrc'))
         env["DAEMON_PIDS"] = _bytes2sys(
             os.path.join(self._threadtmp, b'daemon.pids')
         )
         env["HGEDITOR"] = (
             '"' + sysexecutable + '"' + ' -c "import sys; sys.exit(0)"'
         )
         env["HGUSER"] = "test"
         env["HGENCODING"] = "ascii"
         env["HGENCODINGMODE"] = "strict"
         env["HGHOSTNAME"] = "test-hostname"
         env['HGIPV6'] = str(int(self._useipv6))
         # See contrib/catapipe.py for how to use this functionality.
         if 'HGTESTCATAPULTSERVERPIPE' not in env:
             # If we don't have HGTESTCATAPULTSERVERPIPE explicitly set, pull the
             # non-test one in as a default, otherwise set to devnull
             env['HGTESTCATAPULTSERVERPIPE'] = env.get(
                 'HGCATAPULTSERVERPIPE', os.devnull
             )
 
         extraextensions = []
         for opt in self._extraconfigopts:
             section, key = opt.split('.', 1)
             if section != 'extensions':
                 continue
             name = key.split('=', 1)[0]
             extraextensions.append(name)
 
         if extraextensions:
             env['HGTESTEXTRAEXTENSIONS'] = ' '.join(extraextensions)
 
         # LOCALIP could be ::1 or 127.0.0.1. Useful for tests that require raw
         # IP addresses.
         env['LOCALIP'] = _bytes2sys(self._localip())
 
         # This has the same effect as Py_LegacyWindowsStdioFlag in exewrapper.c,
         # but this is needed for testing python instances like dummyssh,
         # dummysmtpd.py, and dumbhttp.py.
         if WINDOWS:
             env['PYTHONLEGACYWINDOWSSTDIO'] = '1'
 
         # Modified HOME in test environment can confuse Rust tools. So set
         # CARGO_HOME and RUSTUP_HOME automatically if a Rust toolchain is
         # present and these variables aren't already defined.
         cargo_home_path = os.path.expanduser('~/.cargo')
         rustup_home_path = os.path.expanduser('~/.rustup')
 
         if os.path.exists(cargo_home_path) and b'CARGO_HOME' not in osenvironb:
             env['CARGO_HOME'] = cargo_home_path
         if (
             os.path.exists(rustup_home_path)
             and b'RUSTUP_HOME' not in osenvironb
         ):
             env['RUSTUP_HOME'] = rustup_home_path
 
         # Reset some environment variables to well-known values so that
         # the tests produce repeatable output.
         env['LANG'] = env['LC_ALL'] = env['LANGUAGE'] = 'C'
         env['TZ'] = 'GMT'
         env["EMAIL"] = "Foo Bar <[e-mail]>"
         env['COLUMNS'] = '80'
         env['TERM'] = 'xterm'
 
         dropped = [
             'CDPATH',
             'CHGDEBUG',
             'EDITOR',
             'GREP_OPTIONS',
             'HG',
             'HGMERGE',
             'HGPLAIN',
             'HGPLAINEXCEPT',
             'HGPROF',
             'http_proxy',
             'no_proxy',
             'NO_PROXY',
             'PAGER',
             'VISUAL',
         ]
 
         for k in dropped:
             if k in env:
                 del env[k]
 
         # unset env related to hooks
         for k in list(env):
             if k.startswith('HG_'):
                 del env[k]
 
         if self._usechg:
             env['CHGSOCKNAME'] = os.path.join(self._chgsockdir, b'server')
         if self._chgdebug:
             env['CHGDEBUG'] = 'true'
 
         return env
 
     def _createhgrc(self, path):
         """Create an hgrc file for this test."""
         with open(path, 'wb') as hgrc:
             hgrc.write(b'[ui]\n')
             hgrc.write(b'slash = True\n')
             hgrc.write(b'interactive = False\n')
             hgrc.write(b'detailed-exit-code = True\n')
             hgrc.write(b'merge = internal:merge\n')
             hgrc.write(b'mergemarkers = detailed\n')
             hgrc.write(b'promptecho = True\n')
             dummyssh = os.path.join(self._testdir, b'dummyssh')
             hgrc.write(b'ssh = "%s" "%s"\n' % (PYTHON, dummyssh))
             hgrc.write(b'timeout.warn=15\n')
             hgrc.write(b'[chgserver]\n')
             hgrc.write(b'idletimeout=60\n')
             hgrc.write(b'[defaults]\n')
             hgrc.write(b'[devel]\n')
             hgrc.write(b'all-warnings = true\n')
             hgrc.write(b'default-date = 0 0\n')
             hgrc.write(b'[largefiles]\n')
             hgrc.write(
                 b'usercache = %s\n'
                 % (os.path.join(self._testtmp, b'.cache/largefiles'))
             )
             hgrc.write(b'[lfs]\n')
             hgrc.write(
                 b'usercache = %s\n'
                 % (os.path.join(self._testtmp, b'.cache/lfs'))
             )
             hgrc.write(b'[web]\n')
             hgrc.write(b'address = localhost\n')
             hgrc.write(b'ipv6 = %r\n' % self._useipv6)
             hgrc.write(b'server-header = testing stub value\n')
 
             for opt in self._extraconfigopts:
                 section, key = _sys2bytes(opt).split(b'.', 1)
                 assert b'=' in key, (
                     'extra config opt %s must ' 'have an = for assignment' % opt
                 )
                 hgrc.write(b'[%s]\n%s\n' % (section, key))
 
     def fail(self, msg):
         # unittest differentiates between errored and failed.
         # Failed is denoted by AssertionError (by default at least).
         raise AssertionError(msg)
 
     def _runcommand(self, cmd, env, normalizenewlines=False):
         """Run command in a sub-process, capturing the output (stdout and
         stderr).
 
         Return a tuple (exitcode, output). output is None in debug mode.
         """
         if self._debug:
             proc = subprocess.Popen(
                 _bytes2sys(cmd),
                 shell=True,
                 close_fds=closefds,
                 cwd=_bytes2sys(self._testtmp),
                 env=env,
             )
             ret = proc.wait()
             return (ret, None)
 
         proc = Popen4(cmd, self._testtmp, self._timeout, env)
 
         def cleanup():
             terminate(proc)
             ret = proc.wait()
             if ret == 0:
                 ret = signal.SIGTERM << 8
             killdaemons(env['DAEMON_PIDS'])
             return ret
 
         proc.tochild.close()
 
         try:
             output = proc.fromchild.read()
         except KeyboardInterrupt:
             vlog('# Handling keyboard interrupt')
             cleanup()
             raise
 
         ret = proc.wait()
         if wifexited(ret):
             ret = os.WEXITSTATUS(ret)
 
         if proc.timeout:
             ret = 'timeout'
 
         if ret:
             killdaemons(env['DAEMON_PIDS'])
 
         for s, r in self._getreplacements():
             output = re.sub(s, r, output)
 
         if normalizenewlines:
             output = output.replace(b'\r\n', b'\n')
 
         return ret, output.splitlines(True)
 
 
 class PythonTest(Test):
     """A Python-based test."""
 
     @property
     def refpath(self):
         return os.path.join(self._testdir, b'%s.out' % self.bname)
 
     def _run(self, env):
         # Quote the python(3) executable for Windows
         cmd = b'"%s" "%s"' % (PYTHON, self.path)
         vlog("# Running", cmd.decode("utf-8"))
         result = self._runcommand(cmd, env, normalizenewlines=WINDOWS)
         if self._aborted:
             raise KeyboardInterrupt()
 
         return result
 
 
 # Some glob patterns apply only in some circumstances, so the script
 # might want to remove (glob) annotations that otherwise should be
 # retained.
 checkcodeglobpats = [
     # On Windows it looks like \ doesn't require a (glob), but we know
     # better.
     re.compile(br'^pushing to \$TESTTMP/.*[^)]$'),
     re.compile(br'^moving \S+/.*[^)]$'),
     re.compile(br'^pulling from \$TESTTMP/.*[^)]$'),
     # Not all platforms have 127.0.0.1 as loopback (though most do),
     # so we always glob that too.
     re.compile(br'.*\$LOCALIP.*$'),
 ]
 
 bchr = lambda x: bytes([x])
 
 WARN_UNDEFINED = 1
 WARN_YES = 2
 WARN_NO = 3
 
 MARK_OPTIONAL = b" (?)\n"
 
 
 def isoptional(line):
     return line.endswith(MARK_OPTIONAL)
 
 
 class TTest(Test):
     """A "t test" is a test backed by a .t file."""
 
     SKIPPED_PREFIX = b'skipped: '
     FAILED_PREFIX = b'hghave check failed: '
     NEEDESCAPE = re.compile(br'[\x00-\x08\x0b-\x1f\x7f-\xff]').search
 
     ESCAPESUB = re.compile(br'[\x00-\x08\x0b-\x1f\\\x7f-\xff]').sub
     ESCAPEMAP = {bchr(i): br'\x%02x' % i for i in range(256)}
     ESCAPEMAP.update({b'\\': b'\\\\', b'\r': br'\r'})
 
     def __init__(self, path, *args, **kwds):
         # accept an extra "case" parameter
         case = kwds.pop('case', [])
         self._case = case
         self._allcases = {x for y in parsettestcases(path) for x in y}
         super(TTest, self).__init__(path, *args, **kwds)
         if case:
             casepath = b'#'.join(case)
             self.name = '%s#%s' % (self.name, _bytes2sys(casepath))
             self.errpath = b'%s#%s.err' % (self.errpath[:-4], casepath)
             self._tmpname += b'-%s' % casepath.replace(b'#', b'-')
         self._have = {}
 
     @property
     def refpath(self):
         return os.path.join(self._testdir, self.bname)
 
     def _run(self, env):
         with open(self.path, 'rb') as f:
             lines = f.readlines()
 
         # .t file is both reference output and the test input, keep reference
         # output updated with the the test input. This avoids some race
         # conditions where the reference output does not match the actual test.
         if self._refout is not None:
             self._refout = lines
 
         salt, script, after, expected = self._parsetest(lines)
 
         # Write out the generated script.
         fname = b'%s.sh' % self._testtmp
         with open(fname, 'wb') as f:
             for l in script:
                 f.write(l)
 
         cmd = b'%s "%s"' % (self._shell, fname)
         vlog("# Running", cmd.decode("utf-8"))
 
         exitcode, output = self._runcommand(cmd, env)
 
         if self._aborted:
             raise KeyboardInterrupt()
 
         # Do not merge output if skipped. Return hghave message instead.
         # Similarly, with --debug, output is None.
         if exitcode == self.SKIPPED_STATUS or output is None:
             return exitcode, output
 
         return self._processoutput(exitcode, output, salt, after, expected)
 
     def _hghave(self, reqs):
         allreqs = b' '.join(reqs)
 
         self._detectslow(reqs)
 
         if allreqs in self._have:
             return self._have.get(allreqs)
 
         # TODO do something smarter when all other uses of hghave are gone.
         runtestdir = osenvironb[b'RUNTESTDIR']
         tdir = runtestdir.replace(b'\\', b'/')
         proc = Popen4(
             b'%s -c "%s/hghave %s"' % (self._shell, tdir, allreqs),
             self._testtmp,
             0,
             self._getenv(),
         )
         stdout, stderr = proc.communicate()
         ret = proc.wait()
         if wifexited(ret):
             ret = os.WEXITSTATUS(ret)
         if ret == 2:
             print(stdout.decode('utf-8'))
             sys.exit(1)
 
         if ret != 0:
             self._have[allreqs] = (False, stdout)
             return False, stdout
 
         self._have[allreqs] = (True, None)
         return True, None
 
     def _detectslow(self, reqs):
         """update the timeout of slow test when appropriate"""
         if b'slow' in reqs:
             self._timeout = self._slowtimeout
 
     def _iftest(self, args):
         # implements "#if"
         reqs = []
         for arg in args:
             if arg.startswith(b'no-') and arg[3:] in self._allcases:
                 if arg[3:] in self._case:
                     return False
             elif arg in self._allcases:
                 if arg not in self._case:
                     return False
             else:
                 reqs.append(arg)
         self._detectslow(reqs)
         return self._hghave(reqs)[0]
 
     def _parsetest(self, lines):
         # We generate a shell script which outputs unique markers to line
         # up script results with our source. These markers include input
         # line number and the last return code.
         salt = b"SALT%d" % time.time()
 
         def addsalt(line, inpython):
             if inpython:
                 script.append(b'%s %d 0\n' % (salt, line))
             else:
                 script.append(b'echo %s %d $?\n' % (salt, line))
 
         activetrace = []
         session = str(uuid.uuid4()).encode('ascii')
         hgcatapult = os.getenv('HGTESTCATAPULTSERVERPIPE') or os.getenv(
             'HGCATAPULTSERVERPIPE'
         )
 
         def toggletrace(cmd=None):
             if not hgcatapult or hgcatapult == os.devnull:
                 return
 
             if activetrace:
                 script.append(
                     b'echo END %s %s >> "$HGTESTCATAPULTSERVERPIPE"\n'
                     % (session, activetrace[0])
                 )
             if cmd is None:
                 return
 
             if isinstance(cmd, str):
                 quoted = shellquote(cmd.strip())
             else:
                 quoted = shellquote(cmd.strip().decode('utf8')).encode('utf8')
             quoted = quoted.replace(b'\\', b'\\\\')
             script.append(
                 b'echo START %s %s >> "$HGTESTCATAPULTSERVERPIPE"\n'
                 % (session, quoted)
             )
             activetrace[0:] = [quoted]
 
         script = []
 
         # After we run the shell script, we re-unify the script output
         # with non-active parts of the source, with synchronization by our
         # SALT line number markers. The after table contains the non-active
         # components, ordered by line number.
         after = {}
 
         # Expected shell script output.
         expected = {}
 
         pos = prepos = -1
 
         # The current stack of conditionnal section.
         # Each relevant conditionnal section can have the following value:
         #  - True:  we should run this block
         #  - False: we should skip this block
         #  - None:  The parent block is skipped,
         #           (no branch of this one will ever run)
         condition_stack = []
 
         def run_line():
             """return True if the current line should be run"""
             if not condition_stack:
                 return True
             return bool(condition_stack[-1])
 
         def push_conditional_block(should_run):
             """Push a new conditional context, with its initial state
 
             i.e. entry a #if block"""
             if not run_line():
                 condition_stack.append(None)
             else:
                 condition_stack.append(should_run)
 
         def flip_conditional():
             """reverse the current condition state
 
             i.e. enter a #else
             """
             assert condition_stack
             if condition_stack[-1] is not None:
                 condition_stack[-1] = not condition_stack[-1]
 
         def pop_conditional():
             """exit the current skipping context
 
             i.e. reach the #endif"""
             assert condition_stack
             condition_stack.pop()
 
         # We keep track of whether or not we're in a Python block so we
         # can generate the surrounding doctest magic.
         inpython = False
 
         if self._debug:
             script.append(b'set -x\n')
         if os.getenv('MSYSTEM'):
             script.append(b'alias pwd="pwd -W"\n')
 
         if hgcatapult and hgcatapult != os.devnull:
             hgcatapult = hgcatapult.encode('utf8')
             cataname = self.name.encode('utf8')
 
             # Kludge: use a while loop to keep the pipe from getting
             # closed by our echo commands. The still-running file gets
             # reaped at the end of the script, which causes the while
             # loop to exit and closes the pipe. Sigh.
             script.append(
                 b'rtendtracing() {\n'
                 b'  echo END %(session)s %(name)s >> %(catapult)s\n'
                 b'  rm -f "$TESTTMP/.still-running"\n'
                 b'}\n'
                 b'trap "rtendtracing" 0\n'
                 b'touch "$TESTTMP/.still-running"\n'
                 b'while [ -f "$TESTTMP/.still-running" ]; do sleep 1; done '
                 b'> %(catapult)s &\n'
                 b'HGCATAPULTSESSION=%(session)s ; export HGCATAPULTSESSION\n'
                 b'echo START %(session)s %(name)s >> %(catapult)s\n'
                 % {
                     b'name': cataname,
                     b'session': session,
                     b'catapult': hgcatapult,
                 }
             )
 
         if self._case:
             casestr = b'#'.join(self._case)
             if isinstance(casestr, str):
                 quoted = shellquote(casestr)
             else:
                 quoted = shellquote(casestr.decode('utf8')).encode('utf8')
             script.append(b'TESTCASE=%s\n' % quoted)
             script.append(b'export TESTCASE\n')
 
         n = 0
         for n, l in enumerate(lines):
             if not l.endswith(b'\n'):
                 l += b'\n'
             if l.startswith(b'#require'):
                 lsplit = l.split()
                 if len(lsplit) < 2 or lsplit[0] != b'#require':
                     after.setdefault(pos, []).append(
                         b'  !!! invalid #require\n'
                     )
                 if run_line():
                     haveresult, message = self._hghave(lsplit[1:])
                     if not haveresult:
                         script = [b'echo "%s"\nexit 80\n' % message]
                         break
                 after.setdefault(pos, []).append(l)
             elif l.startswith(b'#if'):
                 lsplit = l.split()
                 if len(lsplit) < 2 or lsplit[0] != b'#if':
                     after.setdefault(pos, []).append(b'  !!! invalid #if\n')
                 push_conditional_block(self._iftest(lsplit[1:]))
                 after.setdefault(pos, []).append(l)
             elif l.startswith(b'#else'):
                 if not condition_stack:
                     after.setdefault(pos, []).append(b'  !!! missing #if\n')
                 flip_conditional()
                 after.setdefault(pos, []).append(l)
             elif l.startswith(b'#endif'):
                 if not condition_stack:
                     after.setdefault(pos, []).append(b'  !!! missing #if\n')
                 pop_conditional()
                 after.setdefault(pos, []).append(l)
             elif not run_line():
                 after.setdefault(pos, []).append(l)
             elif l.startswith(b'  >>> '):  # python inlines
                 after.setdefault(pos, []).append(l)
                 prepos = pos
                 pos = n
                 if not inpython:
                     # We've just entered a Python block. Add the header.
                     inpython = True
                     addsalt(prepos, False)  # Make sure we report the exit code.
                     script.append(b'"%s" -m heredoctest <<EOF\n' % PYTHON)
                 addsalt(n, True)
                 script.append(l[2:])
             elif l.startswith(b'  ... '):  # python inlines
                 after.setdefault(prepos, []).append(l)
                 script.append(l[2:])
             elif l.startswith(b'  $ '):  # commands
                 if inpython:
                     script.append(b'EOF\n')
                     inpython = False
                 after.setdefault(pos, []).append(l)
                 prepos = pos
                 pos = n
                 addsalt(n, False)
                 rawcmd = l[4:]
                 cmd = rawcmd.split()
                 toggletrace(rawcmd)
                 if len(cmd) == 2 and cmd[0] == b'cd':
                     rawcmd = b'cd %s || exit 1\n' % cmd[1]
                 script.append(rawcmd)
             elif l.startswith(b'  > '):  # continuations
                 after.setdefault(prepos, []).append(l)
                 script.append(l[4:])
             elif l.startswith(b'  '):  # results
                 # Queue up a list of expected results.
                 expected.setdefault(pos, []).append(l[2:])
             else:
                 if inpython:
                     script.append(b'EOF\n')
                     inpython = False
                 # Non-command/result. Queue up for merged output.
                 after.setdefault(pos, []).append(l)
 
         if inpython:
             script.append(b'EOF\n')
         if condition_stack:
             after.setdefault(pos, []).append(b'  !!! missing #endif\n')
         addsalt(n + 1, False)
         # Need to end any current per-command trace
         if activetrace:
             toggletrace()
         return salt, script, after, expected
 
     def _processoutput(self, exitcode, output, salt, after, expected):
         # Merge the script output back into a unified test.
         warnonly = WARN_UNDEFINED  # 1: not yet; 2: yes; 3: for sure not
         if exitcode != 0:
             warnonly = WARN_NO
 
         pos = -1
         postout = []
         for out_rawline in output:
             out_line, cmd_line = out_rawline, None
             if salt in out_rawline:
                 out_line, cmd_line = out_rawline.split(salt, 1)
 
             pos, postout, warnonly = self._process_out_line(
                 out_line, pos, postout, expected, warnonly
             )
             pos, postout = self._process_cmd_line(cmd_line, pos, postout, after)
 
         if pos in after:
             postout += after.pop(pos)
 
         if warnonly == WARN_YES:
             exitcode = False  # Set exitcode to warned.
 
         return exitcode, postout
 
     def _process_out_line(self, out_line, pos, postout, expected, warnonly):
         while out_line:
             if not out_line.endswith(b'\n'):
                 out_line += b' (no-eol)\n'
 
             # Find the expected output at the current position.
             els = [None]
             if expected.get(pos, None):
                 els = expected[pos]
 
             optional = []
             for i, el in enumerate(els):
                 r = False
                 if el:
                     r, exact = self.linematch(el, out_line)
                 if isinstance(r, str):
                     if r == '-glob':
                         out_line = ''.join(el.rsplit(' (glob)', 1))
                         r = ''  # Warn only this line.
                     elif r == "retry":
                         postout.append(b'  ' + el)
                     else:
                         log('\ninfo, unknown linematch result: %r\n' % r)
                         r = False
                 if r:
                     els.pop(i)
                     break
                 if el:
                     if isoptional(el):
                         optional.append(i)
                     else:
                         m = optline.match(el)
                         if m:
                             conditions = [c for c in m.group(2).split(b' ')]
 
                             if not self._iftest(conditions):
                                 optional.append(i)
                     if exact:
                         # Don't allow line to be matches against a later
                         # line in the output
                         els.pop(i)
                         break
 
             if r:
                 if r == "retry":
                     continue
                 # clean up any optional leftovers
                 for i in optional:
                     postout.append(b'  ' + els[i])
                 for i in reversed(optional):
                     del els[i]
                 postout.append(b'  ' + el)
             else:
                 if self.NEEDESCAPE(out_line):
                     out_line = TTest._stringescape(
                         b'%s (esc)\n' % out_line.rstrip(b'\n')
                     )
                 postout.append(b'  ' + out_line)  # Let diff deal with it.
                 if r != '':  # If line failed.
                     warnonly = WARN_NO
                 elif warnonly == WARN_UNDEFINED:
                     warnonly = WARN_YES
             break
         else:
             # clean up any optional leftovers
             while expected.get(pos, None):
                 el = expected[pos].pop(0)
                 if el:
                     if not isoptional(el):
                         m = optline.match(el)
                         if m:
                             conditions = [c for c in m.group(2).split(b' ')]
 
                             if self._iftest(conditions):
                                 # Don't append as optional line
                                 continue
                         else:
                             continue
                 postout.append(b'  ' + el)
         return pos, postout, warnonly
 
     def _process_cmd_line(self, cmd_line, pos, postout, after):
         """process a "command" part of a line from unified test output"""
         if cmd_line:
             # Add on last return code.
             ret = int(cmd_line.split()[1])
             if ret != 0:
                 postout.append(b'  [%d]\n' % ret)
             if pos in after:
                 # Merge in non-active test bits.
                 postout += after.pop(pos)
             pos = int(cmd_line.split()[0])
         return pos, postout
 
     @staticmethod
     def rematch(el, l):
         try:
             # parse any flags at the beginning of the regex. Only 'i' is
             # supported right now, but this should be easy to extend.
             flags, el = re.match(br'^(\(\?i\))?(.*)', el).groups()[0:2]
             flags = flags or b''
             el = flags + b'(?:' + el + b')'
             # use \Z to ensure that the regex matches to the end of the string
             if WINDOWS:
                 return re.match(el + br'\r?\n\Z', l)
             return re.match(el + br'\n\Z', l)
         except re.error:
             # el is an invalid regex
             return False
 
     @staticmethod
     def globmatch(el, l):
         # The only supported special characters are * and ? plus / which also
         # matches \ on windows. Escaping of these characters is supported.
         if el + b'\n' == l:
             if os.altsep:
                 # matching on "/" is not needed for this line
                 for pat in checkcodeglobpats:
                     if pat.match(el):
                         return True
                 return b'-glob'
             return True
         el = el.replace(b'$LOCALIP', b'*')
         i, n = 0, len(el)
         res = b''
         while i < n:
             c = el[i : i + 1]
             i += 1
             if c == b'\\' and i < n and el[i : i + 1] in b'*?\\/':
                 res += el[i - 1 : i + 1]
                 i += 1
             elif c == b'*':
                 res += b'.*'
             elif c == b'?':
                 res += b'.'
             elif c == b'/' and os.altsep:
                 res += b'[/\\\\]'
             else:
                 res += re.escape(c)
         return TTest.rematch(res, l)
 
     def linematch(self, el, l):
         if el == l:  # perfect match (fast)
             return True, True
         retry = False
         if isoptional(el):
             retry = "retry"
             el = el[: -len(MARK_OPTIONAL)] + b"\n"
         else:
             m = optline.match(el)
             if m:
                 conditions = [c for c in m.group(2).split(b' ')]
 
                 el = m.group(1) + b"\n"
                 if not self._iftest(conditions):
                     # listed feature missing, should not match
                     return "retry", False
 
         if el.endswith(b" (esc)\n"):
             el = el[:-7].decode('unicode_escape') + '\n'
             el = el.encode('latin-1')
         if el == l or WINDOWS and el[:-1] + b'\r\n' == l:
             return True, True
         if el.endswith(b" (re)\n"):
             return (TTest.rematch(el[:-6], l) or retry), False
         if el.endswith(b" (glob)\n"):
             # ignore '(glob)' added to l by 'replacements'
             if l.endswith(b" (glob)\n"):
                 l = l[:-8] + b"\n"
             return (TTest.globmatch(el[:-8], l) or retry), False
         if os.altsep:
             _l = l.replace(b'\\', b'/')
             if el == _l or WINDOWS and el[:-1] + b'\r\n' == _l:
                 return True, True
         return retry, True
 
     @staticmethod
     def parsehghaveoutput(lines):
         """Parse hghave log lines.
 
         Return tuple of lists (missing, failed):
           * the missing/unknown features
           * the features for which existence check failed"""
         missing = []
         failed = []
         for line in lines:
             if line.startswith(TTest.SKIPPED_PREFIX):
                 line = line.splitlines()[0]
                 missing.append(_bytes2sys(line[len(TTest.SKIPPED_PREFIX) :]))
             elif line.startswith(TTest.FAILED_PREFIX):
                 line = line.splitlines()[0]
                 failed.append(_bytes2sys(line[len(TTest.FAILED_PREFIX) :]))
 
         return missing, failed
 
     @staticmethod
     def _escapef(m):
         return TTest.ESCAPEMAP[m.group(0)]
 
     @staticmethod
     def _stringescape(s):
         return TTest.ESCAPESUB(TTest._escapef, s)
 
 
 iolock = threading.RLock()
 firstlock = threading.RLock()
 firsterror = False
 
 base_class = unittest.TextTestResult
 
 
 class TestResult(base_class):
     """Holds results when executing via unittest."""
 
     def __init__(self, options, *args, **kwargs):
         super(TestResult, self).__init__(*args, **kwargs)
 
         self._options = options
 
         # unittest.TestResult didn't have skipped until 2.7. We need to
         # polyfill it.
         self.skipped = []
 
         # We have a custom "ignored" result that isn't present in any Python
         # unittest implementation. It is very similar to skipped. It may make
         # sense to map it into skip some day.
         self.ignored = []
 
         self._dot_printed = 0
         self.times = []
         self._firststarttime = None
         # Data stored for the benefit of generating xunit reports.
         self.successes = []
         self.faildata = {}
 
         if options.color == 'auto':
             isatty = self.stream.isatty()
             # For some reason, redirecting stdout on Windows disables the ANSI
             # color processing of stderr, which is what is used to print the
             # output.  Therefore, both must be tty on Windows to enable color.
             if WINDOWS:
                 isatty = isatty and sys.stdout.isatty()
             self.color = pygmentspresent and isatty
         elif options.color == 'never':
             self.color = False
         else:  # 'always', for testing purposes
             self.color = pygmentspresent
 
     def _write_dot(self, progress):
         """write an item of the "dot" progress"""
         formated = highlight_progress(progress, self.color)
         self.stream.write(formated)
         self._dot_printed += 1
         if not self._dot_printed % 75:
             self.stream.write(f' [{self._dot_printed}]\n'.rjust(8))
         self.stream.flush()
 
     def onStart(self, test):
         """Can be overriden by custom TestResult"""
 
     def onEnd(self):
         """Can be overriden by custom TestResult"""
 
     def addFailure(self, test, reason):
         self.failures.append((test, reason))
 
         if self._options.first:
             self.stop()
         else:
             with iolock:
                 if reason == "timed out":
                     self._write_dot('t')
                 else:
                     if not self._options.nodiff:
                         self.stream.write('\n')
                         # Exclude the '\n' from highlighting to lex correctly
                         formatted = 'ERROR: %s output changed\n' % test
                         self.stream.write(highlightmsg(formatted, self.color))
                     self._write_dot('!')
 
                 self.stream.flush()
 
     def addSuccess(self, test):
         with iolock:
             # bypass the TextTestResult method as do deal with the output ourself
             super(base_class, self).addSuccess(test)
             if self.showAll:
                 self._write_status(test, "ok")
             elif self.dots:
                 self._write_dot('.')
         self.successes.append(test)
 
     def addError(self, test, err):
         super(base_class, self).addError(test, err)
         if self.showAll:
             self._write_status(test, "ERROR")
         elif self.dots:
             self._write_dot('E')
         if self._options.first:
             self.stop()
 
     # Polyfill.
     def addSkip(self, test, reason):
         self.skipped.append((test, reason))
         with iolock:
             if self.showAll:
                 self.stream.writeln('skipped %s' % reason)
             else:
                 self._write_dot('s')
 
     def addIgnore(self, test, reason):
         self.ignored.append((test, reason))
         with iolock:
             if self.showAll:
                 self.stream.writeln('ignored %s' % reason)
             else:
                 if reason not in ('not retesting', "doesn't match keyword"):
                     self._write_dot('i')
                 else:
                     self.testsRun += 1
 
     def addOutputMismatch(self, test, ret, got, expected):
         """Record a mismatch in test output for a particular test."""
         if self.shouldStop or firsterror:
             # don't print, some other test case already failed and
             # printed, we're just stale and probably failed due to our
             # temp dir getting cleaned up.
             return
 
         accepted = False
         lines = []
 
         with iolock:
             if self._options.nodiff:
                 pass
             elif self._options.view:
                 v = self._options.view
                 subprocess.call(
                     r'"%s" "%s" "%s"'
                     % (v, _bytes2sys(test.refpath), _bytes2sys(test.errpath)),
                     shell=True,
                 )
             else:
                 servefail, lines = getdiff(
                     expected, got, test.refpath, test.errpath
                 )
                 self.stream.write('\n')
                 for line in lines:
                     line = highlightdiff(line, self.color)
                     self.stream.flush()
                     self.stream.buffer.write(line)
                     self.stream.buffer.flush()
 
                 if servefail:
                     raise test.failureException(
                         'server failed to start (HGPORT=%s)' % test._startport
                     )
 
             # handle interactive prompt without releasing iolock
             if self._options.interactive:
                 if test.readrefout() != expected:
                     self.stream.write(
                         'Reference output has changed (run again to prompt '
                         'changes)'
                     )
                 else:
                     self.stream.write('Accept this change? [y/N] ')
                     self.stream.flush()
                     answer = sys.stdin.readline().strip()
                     if answer.lower() in ('y', 'yes'):
                         if test.path.endswith(b'.t'):
                             rename(test.errpath, test.path)
                         else:
                             rename(test.errpath, b'%s.out' % test.path)
                         accepted = True
             if not accepted:
                 self.faildata[test.name] = b''.join(lines)
 
         return accepted
 
     def startTest(self, test):
         super(TestResult, self).startTest(test)
 
         # os.times module computes the user time and system time spent by
         # child's processes along with real elapsed time taken by a process.
         # This module has one limitation. It can only work for Linux user
         # and not for Windows. Hence why we fall back to another function
         # for wall time calculations.
         test.started_times = os.times()
         # TODO use a monotonic clock once support for Python 2.7 is dropped.
         test.started_time = time.time()
         if self._firststarttime is None:  # thread racy but irrelevant
             self._firststarttime = test.started_time
 
     def stopTest(self, test, interrupted=False):
         super(TestResult, self).stopTest(test)
 
         test.stopped_times = os.times()
         stopped_time = time.time()
 
         starttime = test.started_times
         endtime = test.stopped_times
         origin = self._firststarttime
         self.times.append(
             (
                 test.name,
                 endtime[2] - starttime[2],  # user space CPU time
                 endtime[3] - starttime[3],  # sys  space CPU time
                 stopped_time - test.started_time,  # real time
                 test.started_time - origin,  # start date in run context
                 stopped_time - origin,  # end date in run context
             )
         )
 
         if interrupted:
             with iolock:
                 self.stream.writeln(
                     'INTERRUPTED: %s (after %d seconds)'
                     % (test.name, self.times[-1][3])
                 )
 
 
 def getTestResult():
     """
     Returns the relevant test result
     """
     if "CUSTOM_TEST_RESULT" in os.environ:
         testresultmodule = __import__(os.environ["CUSTOM_TEST_RESULT"])
         return testresultmodule.TestResult
     else:
         return TestResult
 
 
 class TestSuite(unittest.TestSuite):
     """Custom unittest TestSuite that knows how to execute Mercurial tests."""
 
     def __init__(
         self,
         testdir,
         jobs=1,
         whitelist=None,
         blacklist=None,
         keywords=None,
         loop=False,
         runs_per_test=1,
         loadtest=None,
         showchannels=False,
         *args,
         **kwargs,
     ):
         """Create a new instance that can run tests with a configuration.
 
         testdir specifies the directory where tests are executed from. This
         is typically the ``tests`` directory from Mercurial's source
         repository.
 
         jobs specifies the number of jobs to run concurrently. Each test
         executes on its own thread. Tests actually spawn new processes, so
         state mutation should not be an issue.
 
         If there is only one job, it will use the main thread.
 
         whitelist and blacklist denote tests that have been whitelisted and
         blacklisted, respectively. These arguments don't belong in TestSuite.
         Instead, whitelist and blacklist should be handled by the thing that
         populates the TestSuite with tests. They are present to preserve
         backwards compatible behavior which reports skipped tests as part
         of the results.
 
         keywords denotes key words that will be used to filter which tests
         to execute. This arguably belongs outside of TestSuite.
 
         loop denotes whether to loop over tests forever.
         """
         super(TestSuite, self).__init__(*args, **kwargs)
 
         self._jobs = jobs
         self._whitelist = whitelist
         self._blacklist = blacklist
         self._keywords = keywords
         self._loop = loop
         self._runs_per_test = runs_per_test
         self._loadtest = loadtest
         self._showchannels = showchannels
 
     def run(self, result):
         # We have a number of filters that need to be applied. We do this
         # here instead of inside Test because it makes the running logic for
         # Test simpler.
         tests = []
         num_tests = [0]
         for test in self._tests:
 
             def get():
                 num_tests[0] += 1
                 if getattr(test, 'should_reload', False):
                     return self._loadtest(test, num_tests[0])
                 return test
 
             if not os.path.exists(test.path):
                 result.addSkip(test, "Doesn't exist")
                 continue
 
             is_whitelisted = self._whitelist and (
                 test.relpath in self._whitelist or test.bname in self._whitelist
             )
             if not is_whitelisted:
                 is_blacklisted = self._blacklist and (
                     test.relpath in self._blacklist
                     or test.bname in self._blacklist
                 )
                 if is_blacklisted:
                     result.addSkip(test, 'blacklisted')
                     continue
                 if self._keywords:
                     with open(test.path, 'rb') as f:
                         t = f.read().lower() + test.bname.lower()
                     ignored = False
                     for k in self._keywords.lower().split():
                         if k not in t:
                             result.addIgnore(test, "doesn't match keyword")
                             ignored = True
                             break
 
                     if ignored:
                         continue
             for _ in range(self._runs_per_test):
                 tests.append(get())
 
         runtests = list(tests)
         done = queue.Queue()
         running = 0
 
         channels_lock = threading.Lock()
         channels = [""] * self._jobs
 
         def job(test, result):
             with channels_lock:
                 for n, v in enumerate(channels):
                     if not v:
                         channel = n
                         break
                 else:
                     raise ValueError('Could not find output channel')
                 channels[channel] = "=" + test.name[5:].split(".")[0]
 
             r = None
             try:
                 test(result)
             except KeyboardInterrupt:
                 pass
             except:  # re-raises
                 r = ('!', test, 'run-test raised an error, see traceback')
                 raise
             finally:
                 try:
                     channels[channel] = ''
                 except IndexError:
                     pass
                 done.put(r)
 
         def stat():
             count = 0
             while channels:
                 d = '\n%03s  ' % count
                 for n, v in enumerate(channels):
                     if v:
                         d += v[0]
                         channels[n] = v[1:] or '.'
                     else:
                         d += ' '
                     d += ' '
                 with iolock:
                     sys.stdout.write(d + '  ')
                     sys.stdout.flush()
                 for x in range(10):
                     if channels:
                         time.sleep(0.1)
                 count += 1
 
         stoppedearly = False
 
         if self._showchannels:
             statthread = threading.Thread(target=stat, name="stat")
             statthread.start()
 
         try:
             while tests or running:
                 if not done.empty() or running == self._jobs or not tests:
                     try:
                         done.get(True, 1)
                         running -= 1
                         if result and result.shouldStop:
                             stoppedearly = True
                             break
                     except queue.Empty:
                         continue
                 if tests and not running == self._jobs:
                     test = tests.pop(0)
                     if self._loop:
                         if getattr(test, 'should_reload', False):
                             num_tests[0] += 1
                             tests.append(self._loadtest(test, num_tests[0]))
                         else:
                             tests.append(test)
                     if self._jobs == 1:
                         job(test, result)
                     else:
                         t = threading.Thread(
                             target=job, name=test.name, args=(test, result)
                         )
                         t.start()
                     running += 1
 
             # If we stop early we still need to wait on started tests to
             # finish. Otherwise, there is a race between the test completing
             # and the test's cleanup code running. This could result in the
             # test reporting incorrect.
             if stoppedearly:
                 while running:
                     try:
                         done.get(True, 1)
                         running -= 1
                     except queue.Empty:
                         continue
         except KeyboardInterrupt:
             for test in runtests:
                 test.abort()
 
         channels = []
 
         return result
 
 
 # Save the most recent 5 wall-clock runtimes of each test to a
 # human-readable text file named .testtimes. Tests are sorted
 # alphabetically, while times for each test are listed from oldest to
 # newest.
 
 
 def loadtimes(outputdir):
     times = []
     try:
         with open(os.path.join(outputdir, b'.testtimes')) as fp:
             for line in fp:
                 m = re.match('(.*?) ([0-9. ]+)', line)
                 times.append(
                     (m.group(1), [float(t) for t in m.group(2).split()])
                 )
     except FileNotFoundError:
         pass
     return times
 
 
 def savetimes(outputdir, result):
     saved = dict(loadtimes(outputdir))
     maxruns = 5
     skipped = {str(t[0]) for t in result.skipped}
     for tdata in result.times:
         test, real = tdata[0], tdata[3]
         if test not in skipped:
             ts = saved.setdefault(test, [])
             ts.append(real)
             ts[:] = ts[-maxruns:]
 
     fd, tmpname = tempfile.mkstemp(
         prefix=b'.testtimes', dir=outputdir, text=True
     )
     with os.fdopen(fd, 'w') as fp:
         for name, ts in sorted(saved.items()):
             fp.write('%s %s\n' % (name, ' '.join(['%.3f' % (t,) for t in ts])))
     timepath = os.path.join(outputdir, b'.testtimes')
     try:
         os.unlink(timepath)
     except OSError:
         pass
     try:
         os.rename(tmpname, timepath)
     except OSError:
         pass
 
 
 class TextTestRunner(unittest.TextTestRunner):
     """Custom unittest test runner that uses appropriate settings."""
 
     def __init__(self, runner, *args, **kwargs):
         super(TextTestRunner, self).__init__(*args, **kwargs)
 
         self._runner = runner
 
         self._result = getTestResult()(
             self._runner.options, self.stream, self.descriptions, self.verbosity
         )
 
     def listtests(self, test):
         test = sorted(test, key=lambda t: t.name)
 
         self._result.onStart(test)
 
         for t in test:
             print(t.name)
             self._result.addSuccess(t)
 
         if self._runner.options.xunit:
             with open(self._runner.options.xunit, "wb") as xuf:
                 self._writexunit(self._result, xuf)
 
         if self._runner.options.json:
             jsonpath = os.path.join(self._runner._outputdir, b'report.json')
             with open(jsonpath, 'w') as fp:
                 self._writejson(self._result, fp)
 
         return self._result
 
     def run(self, test):
         self._result.onStart(test)
         test(self._result)
 
         failed = len(self._result.failures)
         skipped = len(self._result.skipped)
         ignored = len(self._result.ignored)
 
         with iolock:
             self.stream.writeln('')
 
             if not self._runner.options.noskips:
                 for test, msg in sorted(
                     self._result.skipped, key=lambda s: s[0].name
                 ):
                     formatted = 'Skipped %s: %s\n' % (test.name, msg)
                     msg = highlightmsg(formatted, self._result.color)
                     self.stream.write(msg)
             for test, msg in sorted(
                 self._result.failures, key=lambda f: f[0].name
             ):
                 formatted = 'Failed %s: %s\n' % (test.name, msg)
                 self.stream.write(highlightmsg(formatted, self._result.color))
             for test, msg in sorted(
                 self._result.errors, key=lambda e: e[0].name
             ):
                 self.stream.writeln('Errored %s: %s' % (test.name, msg))
 
             if self._runner.options.xunit:
                 with open(self._runner.options.xunit, "wb") as xuf:
                     self._writexunit(self._result, xuf)
 
             if self._runner.options.json:
                 jsonpath = os.path.join(self._runner._outputdir, b'report.json')
                 with open(jsonpath, 'w') as fp:
                     self._writejson(self._result, fp)
 
             self._runner._checkhglib('Tested')
 
             savetimes(self._runner._outputdir, self._result)
 
             if failed and self._runner.options.known_good_rev:
                 self._bisecttests(t for t, m in self._result.failures)
             self.stream.writeln(
                 '# Ran %d tests, %d skipped, %d failed.'
                 % (self._result.testsRun, skipped + ignored, failed)
             )
             if failed:
                 self.stream.writeln(
                     'python hash seed: %s' % os.environ['PYTHONHASHSEED']
                 )
             if self._runner.options.time:
                 self.printtimes(self._result.times)
 
             if self._runner.options.exceptions:
                 exceptions = aggregateexceptions(
                     os.path.join(self._runner._outputdir, b'exceptions')
                 )
 
                 self.stream.writeln('Exceptions Report:')
                 self.stream.writeln(
                     '%d total from %d frames'
                     % (exceptions['total'], len(exceptions['exceptioncounts']))
                 )
                 combined = exceptions['combined']
                 for key in sorted(combined, key=combined.get, reverse=True):
                     frame, line, exc = key
                     totalcount, testcount, leastcount, leasttest = combined[key]
 
                     self.stream.writeln(
                         '%d (%d tests)\t%s: %s (%s - %d total)'
                         % (
                             totalcount,
                             testcount,
                             frame,
                             exc,
                             leasttest,
                             leastcount,
                         )
                     )
 
             self.stream.flush()
 
         return self._result
 
     def _bisecttests(self, tests):
         bisectcmd = ['hg', 'bisect']
         bisectrepo = self._runner.options.bisect_repo
         if bisectrepo:
             bisectcmd.extend(['-R', os.path.abspath(bisectrepo)])
 
         def pread(args):
             env = os.environ.copy()
             env['HGPLAIN'] = '1'
             p = subprocess.Popen(
                 args, stderr=subprocess.STDOUT, stdout=subprocess.PIPE, env=env
             )
             data = p.stdout.read()
             p.wait()
             return data
 
         for test in tests:
             pread(bisectcmd + ['--reset']),
             pread(bisectcmd + ['--bad', '.'])
             pread(bisectcmd + ['--good', self._runner.options.known_good_rev])
             # TODO: we probably need to forward more options
             # that alter hg's behavior inside the tests.
             opts = ''
             withhg = self._runner.options.with_hg
             if withhg:
                 opts += ' --with-hg=%s ' % shellquote(_bytes2sys(withhg))
             rtc = '%s %s %s %s' % (sysexecutable, sys.argv[0], opts, test)
             data = pread(bisectcmd + ['--command', rtc])
             m = re.search(
                 (
                     br'\nThe first (?P<goodbad>bad|good) revision '
                     br'is:\nchangeset: +\d+:(?P<node>[a-f0-9]+)\n.*\n'
                     br'summary: +(?P<summary>[^\n]+)\n'
                 ),
                 data,
                 (re.MULTILINE | re.DOTALL),
             )
             if m is None:
                 self.stream.writeln(
                     'Failed to identify failure point for %s' % test
                 )
                 continue
             dat = m.groupdict()
             verb = 'broken' if dat['goodbad'] == b'bad' else 'fixed'
             self.stream.writeln(
                 '%s %s by %s (%s)'
                 % (
                     test,
                     verb,
                     dat['node'].decode('ascii'),
                     dat['summary'].decode('utf8', 'ignore'),
                 )
             )
 
     def printtimes(self, times):
         # iolock held by run
         self.stream.writeln('# Producing time report')
         times.sort(key=lambda t: (t[3]))
         cols = '%7.3f %7.3f %7.3f %7.3f %7.3f   %s'
         self.stream.writeln(
             '%-7s %-7s %-7s %-7s %-7s   %s'
             % ('start', 'end', 'cuser', 'csys', 'real', 'Test')
         )
         for tdata in times:
             test = tdata[0]
             cuser, csys, real, start, end = tdata[1:6]
             self.stream.writeln(cols % (start, end, cuser, csys, real, test))
 
     @staticmethod
     def _writexunit(result, outf):
         # See http://llg.cubic.org/docs/junit/ for a reference.
         timesd = {t[0]: t[3] for t in result.times}
         doc = minidom.Document()
         s = doc.createElement('testsuite')
         s.setAttribute('errors', "0")  # TODO
         s.setAttribute('failures', str(len(result.failures)))
         s.setAttribute('name', 'run-tests')
         s.setAttribute(
             'skipped', str(len(result.skipped) + len(result.ignored))
         )
         s.setAttribute('tests', str(result.testsRun))
         doc.appendChild(s)
         for tc in result.successes:
             t = doc.createElement('testcase')
             t.setAttribute('name', tc.name)
             tctime = timesd.get(tc.name)
             if tctime is not None:
                 t.setAttribute('time', '%.3f' % tctime)
             s.appendChild(t)
         for tc, err in sorted(result.faildata.items()):
             t = doc.createElement('testcase')
             t.setAttribute('name', tc)
             tctime = timesd.get(tc)
             if tctime is not None:
                 t.setAttribute('time', '%.3f' % tctime)
             # createCDATASection expects a unicode or it will
             # convert using default conversion rules, which will
             # fail if string isn't ASCII.
             err = cdatasafe(err).decode('utf-8', 'replace')
             cd = doc.createCDATASection(err)
             # Use 'failure' here instead of 'error' to match errors = 0,
             # failures = len(result.failures) in the testsuite element.
             failelem = doc.createElement('failure')
             failelem.setAttribute('message', 'output changed')
             failelem.setAttribute('type', 'output-mismatch')
             failelem.appendChild(cd)
             t.appendChild(failelem)
             s.appendChild(t)
         for tc, message in result.skipped:
             # According to the schema, 'skipped' has no attributes. So store
             # the skip message as a text node instead.
             t = doc.createElement('testcase')
             t.setAttribute('name', tc.name)
             binmessage = message.encode('utf-8')
             message = cdatasafe(binmessage).decode('utf-8', 'replace')
             cd = doc.createCDATASection(message)
             skipelem = doc.createElement('skipped')
             skipelem.appendChild(cd)
             t.appendChild(skipelem)
             s.appendChild(t)
         outf.write(doc.toprettyxml(indent='  ', encoding='utf-8'))
 
     @staticmethod
     def _writejson(result, outf):
         timesd = {}
         for tdata in result.times:
             test = tdata[0]
             timesd[test] = tdata[1:]
 
         outcome = {}
         groups = [
             ('success', ((tc, None) for tc in result.successes)),
             ('failure', result.failures),
             ('skip', result.skipped),
         ]
         for res, testcases in groups:
             for tc, __ in testcases:
                 if tc.name in timesd:
                     diff = result.faildata.get(tc.name, b'')
                     try:
                         diff = diff.decode('unicode_escape')
                     except UnicodeDecodeError as e:
                         diff = '%r decoding diff, sorry' % e
                     tres = {
                         'result': res,
                         'time': ('%0.3f' % timesd[tc.name][2]),
                         'cuser': ('%0.3f' % timesd[tc.name][0]),
                         'csys': ('%0.3f' % timesd[tc.name][1]),
                         'start': ('%0.3f' % timesd[tc.name][3]),
                         'end': ('%0.3f' % timesd[tc.name][4]),
                         'diff': diff,
                     }
                 else:
                     # blacklisted test
                     tres = {'result': res}
 
                 outcome[tc.name] = tres
         jsonout = json.dumps(
             outcome, sort_keys=True, indent=4, separators=(',', ': ')
         )
         outf.writelines(("testreport =", jsonout))
 
 
 def sorttests(testdescs, previoustimes, shuffle=False):
     """Do an in-place sort of tests."""
     if shuffle:
         random.shuffle(testdescs)
         return
 
     if previoustimes:
 
         def sortkey(f):
             f = f['path']
             if f in previoustimes:
                 # Use most recent time as estimate
                 return -(previoustimes[f][-1])
             else:
                 # Default to a rather arbitrary value of 1 second for new tests
                 return -1.0
 
     else:
         # keywords for slow tests
         slow = {
             b'svn': 10,
             b'cvs': 10,
             b'hghave': 10,
             b'largefiles-update': 10,
             b'run-tests': 10,
             b'corruption': 10,
             b'race': 10,
             b'i18n': 10,
             b'check': 100,
             b'gendoc': 100,
             b'contrib-perf': 200,
             b'merge-combination': 100,
         }
         perf = {}
 
         def sortkey(f):
             # run largest tests first, as they tend to take the longest
             f = f['path']
             try:
                 return perf[f]
             except KeyError:
                 try:
                     val = -os.stat(f).st_size
                 except FileNotFoundError:
                     perf[f] = -1e9  # file does not exist, tell early
                     return -1e9
                 for kw, mul in slow.items():
                     if kw in f:
                         val *= mul
                 if f.endswith(b'.py'):
                     val /= 10.0
                 perf[f] = val / 1000.0
                 return perf[f]
 
     testdescs.sort(key=sortkey)
 
 
 class TestRunner:
     """Holds context for executing tests.
 
     Tests rely on a lot of state. This object holds it for them.
     """
 
     # Programs required to run tests.
     REQUIREDTOOLS = [
         b'diff',
         b'grep',
         b'unzip',
         b'gunzip',
         b'bunzip2',
         b'sed',
     ]
 
     # Maps file extensions to test class.
     TESTTYPES = [
         (b'.py', PythonTest),
         (b'.t', TTest),
     ]
 
     def __init__(self):
         self.options = None
         self._hgroot = None
         self._testdir = None
         self._outputdir = None
         self._hgtmp = None
         self._installdir = None
         self._bindir = None
         # a place for run-tests.py to generate executable it needs
         self._custom_bin_dir = None
         self._pythondir = None
         # True if we had to infer the pythondir from --with-hg
         self._pythondir_inferred = False
         self._coveragefile = None
         self._createdfiles = []
         self._hgcommand = None
         self._hgpath = None
         self._portoffset = 0
         self._ports = {}
 
     def run(self, args, parser=None):
         """Run the test suite."""
         oldmask = os.umask(0o22)
         try:
             parser = parser or getparser()
             options = parseargs(args, parser)
             tests = [_sys2bytes(a) for a in options.tests]
             if options.test_list is not None:
                 for listfile in options.test_list:
                     with open(listfile, 'rb') as f:
                         tests.extend(t for t in f.read().splitlines() if t)
             self.options = options
 
             self._checktools()
             testdescs = self.findtests(tests)
             if options.profile_runner:
                 import statprof
 
                 statprof.start()
             result = self._run(
                 testdescs,
                 shard_index=options.shard_index,
                 shard_total=options.shard_total,
             )
             if options.profile_runner:
                 statprof.stop()
                 statprof.display()
             return result
 
         finally:
             os.umask(oldmask)
 
     def _run(self, testdescs, shard_index=None, shard_total=None):
         testdir = getcwdb()
         # assume all tests in same folder for now
         if testdescs:
             pathname = os.path.dirname(testdescs[0]['path'])
             if pathname:
                 testdir = os.path.join(testdir, pathname)
         self._testdir = osenvironb[b'TESTDIR'] = testdir
         osenvironb[b'TESTDIR_FORWARD_SLASH'] = osenvironb[b'TESTDIR'].replace(
             os.sep.encode('ascii'), b'/'
         )
 
         if self.options.outputdir:
             self._outputdir = canonpath(_sys2bytes(self.options.outputdir))
         else:
             self._outputdir = getcwdb()
             if testdescs and pathname:
                 self._outputdir = os.path.join(self._outputdir, pathname)
         previoustimes = {}
         if self.options.order_by_runtime:
             previoustimes = dict(loadtimes(self._outputdir))
         sorttests(testdescs, previoustimes, shuffle=self.options.random)
 
         if 'PYTHONHASHSEED' not in os.environ:
             # use a random python hash seed all the time
             # we do the randomness ourself to know what seed is used
             os.environ['PYTHONHASHSEED'] = str(random.getrandbits(32))
 
         # Rayon (Rust crate for multi-threading) will use all logical CPU cores
         # by default, causing thrashing on high-cpu-count systems.
         # Setting its limit to 3 during tests should still let us uncover
         # multi-threading bugs while keeping the thrashing reasonable.
         os.environ.setdefault("RAYON_NUM_THREADS", "3")
 
         if self.options.tmpdir:
             self.options.keep_tmpdir = True
             tmpdir = _sys2bytes(self.options.tmpdir)
             if os.path.exists(tmpdir):
                 # Meaning of tmpdir has changed since 1.3: we used to create
                 # HGTMP inside tmpdir; now HGTMP is tmpdir.  So fail if
                 # tmpdir already exists.
                 print("error: temp dir %r already exists" % tmpdir)
                 return 1
 
             os.makedirs(tmpdir)
         else:
             d = None
             if WINDOWS:
                 # without this, we get the default temp dir location, but
                 # in all lowercase, which causes troubles with paths (issue3490)
                 d = osenvironb.get(b'TMP', None)
             tmpdir = tempfile.mkdtemp(b'', b'hgtests.', d)
 
         self._hgtmp = osenvironb[b'HGTMP'] = os.path.realpath(tmpdir)
 
         self._custom_bin_dir = os.path.join(self._hgtmp, b'custom-bin')
         os.makedirs(self._custom_bin_dir)
 
         # detect and enforce an alternative way to specify rust extension usage
         if (
             not (
                 self.options.wheel
                 or self.options.pure
                 or self.options.rust
                 or self.options.no_rust
             )
             and os.environ.get("HGWITHRUSTEXT") == "cpython"
         ):
             self.options.rust = True
 
         if self.options.with_hg:
             self._installdir = None
             whg = self.options.with_hg
             self._bindir = os.path.dirname(os.path.realpath(whg))
             assert isinstance(self._bindir, bytes)
             self._hgcommand = os.path.basename(whg)
 
             normbin = os.path.normpath(os.path.abspath(whg))
             normbin = normbin.replace(_sys2bytes(os.sep), b'/')
 
             # Other Python scripts in the test harness need to
             # `import mercurial`. If `hg` is a Python script, we assume
             # the Mercurial modules are relative to its path and tell the tests
             # to load Python modules from its directory.
             with open(whg, 'rb') as fh:
                 initial = fh.read(1024)
 
             if re.match(b'#!.*python', initial):
                 self._pythondir = self._bindir
             # If it looks like our in-repo Rust binary, use the source root.
             # This is a bit hacky. But rhg is still not supported outside the
             # source directory. So until it is, do the simple thing.
             elif re.search(b'/rust/target/[^/]+/hg', normbin):
                 self._pythondir = os.path.dirname(self._testdir)
             # Fall back to the legacy behavior.
             else:
                 self._pythondir = self._bindir
             self._pythondir_inferred = True
 
         else:
             self._installdir = os.path.join(self._hgtmp, b"install")
             if WINDOWS:
                 # The wheel variant will install things in "Scripts".
                 # So we can as well always install things here.
                 self._bindir = os.path.join(self._installdir, b"Scripts")
             else:
                 self._bindir = os.path.join(self._installdir, b"bin")
             self._hgcommand = b'hg'
 
             if self.options.wheel and not WINDOWS:
                 # pip installing a wheel does not have an --install-lib flag
                 # so we have to guess where the file will be installed.
                 #
                 # In addition, that location is not really stable, so we are
                 # using awful symlink trrick later in `_installhg`
                 v_info = sys.version_info
                 suffix = os.path.join(
                     b"lib",
                     b"python%d.%d" % (v_info.major, v_info.minor),
                     b"site-packages",
                 )
             elif self.options.wheel and WINDOWS:
                 # for some reason, Windows use an even different scheme:
                 #
                 # <prefix>/lib/site-packages/
                 suffix = os.path.join(
                     b"lib",
                     b"site-packages",
                 )
             else:
                 suffix = os.path.join(b"lib", b"python")
             self._pythondir = os.path.join(self._installdir, suffix)
 
         # Force the use of hg.exe instead of relying on MSYS to recognize hg is
         # a python script and feed it to python.exe.  Legacy stdio is force
         # enabled by hg.exe, and this is a more realistic way to launch hg
         # anyway.
         #
         # We do not do it when using wheels and they do not install a .exe.
         if (
             WINDOWS
             and not self.options.wheel
             and not self._hgcommand.endswith(b'.exe')
         ):
             self._hgcommand += b'.exe'
 
         real_hg = os.path.join(self._bindir, self._hgcommand)
         osenvironb[b'HGTEST_REAL_HG'] = real_hg
         # set CHGHG, then replace "hg" command by "chg"
         chgbindir = self._bindir
         if self.options.chg or self.options.with_chg:
             osenvironb[b'CHG_INSTALLED_AS_HG'] = b'1'
             osenvironb[b'CHGHG'] = real_hg
         else:
             # drop flag for hghave
             osenvironb.pop(b'CHG_INSTALLED_AS_HG', None)
         if self.options.chg:
             self._hgcommand = b'chg'
         elif self.options.with_chg:
             chgbindir = os.path.dirname(os.path.realpath(self.options.with_chg))
             self._hgcommand = os.path.basename(self.options.with_chg)
 
         # configure fallback and replace "hg" command by "rhg"
         rhgbindir = self._bindir
         if self.options.rhg or self.options.with_rhg:
             # Affects hghave.py
             osenvironb[b'RHG_INSTALLED_AS_HG'] = b'1'
             # Affects configuration. Alternatives would be setting configuration through
             # `$HGRCPATH` but some tests override that, or changing `_hgcommand` to include
             # `--config` but that disrupts tests that print command lines and check expected
             # output.
             osenvironb[b'RHG_ON_UNSUPPORTED'] = b'fallback'
             osenvironb[b'RHG_FALLBACK_EXECUTABLE'] = real_hg
         else:
             # drop flag for hghave
             osenvironb.pop(b'RHG_INSTALLED_AS_HG', None)
         if self.options.rhg:
             self._hgcommand = b'rhg'
         elif self.options.with_rhg:
             rhgbindir = os.path.dirname(os.path.realpath(self.options.with_rhg))
             self._hgcommand = os.path.basename(self.options.with_rhg)
 
         if self.options.pyoxidized:
             testdir = os.path.dirname(_sys2bytes(canonpath(sys.argv[0])))
             reporootdir = os.path.dirname(testdir)
             # XXX we should ideally install stuff instead of using the local build
 
             exe = b'hg'
             triple = b''
 
             if WINDOWS:
                 triple = b'x86_64-pc-windows-msvc'
                 exe = b'hg.exe'
             elif MACOS:
                 # TODO: support Apple silicon too
                 triple = b'x86_64-apple-darwin'
 
             bin_path = b'build/pyoxidizer/%s/release/app/%s' % (triple, exe)
             full_path = os.path.join(reporootdir, bin_path)
             self._hgcommand = full_path
             # Affects hghave.py
             osenvironb[b'PYOXIDIZED_INSTALLED_AS_HG'] = b'1'
         else:
             osenvironb.pop(b'PYOXIDIZED_INSTALLED_AS_HG', None)
 
         osenvironb[b"BINDIR"] = self._bindir
         osenvironb[b"PYTHON"] = PYTHON
 
         fileb = _sys2bytes(__file__)
         runtestdir = os.path.abspath(os.path.dirname(fileb))
         osenvironb[b'RUNTESTDIR'] = runtestdir
         osenvironb[b'RUNTESTDIR_FORWARD_SLASH'] = runtestdir.replace(
             os.sep.encode('ascii'), b'/'
         )
         sepb = _sys2bytes(os.pathsep)
         path = [self._bindir, runtestdir] + osenvironb[b"PATH"].split(sepb)
         if os.path.islink(__file__):
             # test helper will likely be at the end of the symlink
             realfile = os.path.realpath(fileb)
             realdir = os.path.abspath(os.path.dirname(realfile))
             path.insert(2, realdir)
         if chgbindir != self._bindir:
             path.insert(1, chgbindir)
         if rhgbindir != self._bindir:
             path.insert(1, rhgbindir)
         if self._testdir != runtestdir:
             path = [self._testdir] + path
         path = [self._custom_bin_dir] + path
         osenvironb[b"PATH"] = sepb.join(path)
 
         # Include TESTDIR in PYTHONPATH so that out-of-tree extensions
         # can run .../tests/run-tests.py test-foo where test-foo
         # adds an extension to HGRC. Also include run-test.py directory to
         # import modules like heredoctest.
         pypath = [self._pythondir, self._testdir, runtestdir]
 
         # Setting PYTHONPATH with an activated venv causes the modules installed
         # in it to be ignored.  Therefore, include the related paths in sys.path
         # in PYTHONPATH.  If the executable is run directly without activation,
         # any modules installed in it would also be ignored, so include them for
         # the same reason.
 
         for p in sys.path:
             if p.startswith(sys.exec_prefix):
                 path = _sys2bytes(p)
                 if path not in pypath:
                     pypath.append(path)
 
         # We have to augment PYTHONPATH, rather than simply replacing
         # it, in case external libraries are only available via current
         # PYTHONPATH.  (In particular, the Subversion bindings on OS X
         # are in /opt/subversion.)
         oldpypath = osenvironb.get(IMPL_PATH)
         if oldpypath:
             pypath.append(oldpypath)
         osenvironb[IMPL_PATH] = sepb.join(pypath)
 
         os.environ["HGTEST_BASE_HGMODULEPOLICY"] = os.environ.get(
             "HGMODULEPOLICY", ""
         )
 
         if self.options.pure:
             os.environ["HGTEST_RUN_TESTS_PURE"] = "--pure"
             os.environ["HGMODULEPOLICY"] = "py"
         if self.options.rust:
             os.environ["HGMODULEPOLICY"] = "rust+c"
         if self.options.no_rust:
             current_policy = os.environ.get("HGMODULEPOLICY", "")
             if current_policy.startswith("rust+"):
                 os.environ["HGMODULEPOLICY"] = current_policy[len("rust+") :]
             os.environ.pop("HGWITHRUSTEXT", None)
 
         if self.options.allow_slow_tests:
             os.environ["HGTEST_SLOW"] = "slow"
         elif 'HGTEST_SLOW' in os.environ:
             del os.environ['HGTEST_SLOW']
 
         self._coveragefile = os.path.join(self._testdir, b'.coverage')
 
         if self.options.exceptions:
             exceptionsdir = os.path.join(self._outputdir, b'exceptions')
             try:
                 os.makedirs(exceptionsdir)
             except FileExistsError:
                 pass
 
             # Remove all existing exception reports.
             for f in os.listdir(exceptionsdir):
                 os.unlink(os.path.join(exceptionsdir, f))
 
             osenvironb[b'HGEXCEPTIONSDIR'] = exceptionsdir
             logexceptions = os.path.join(self._testdir, b'logexceptions.py')
             self.options.extra_config_opt.append(
                 'extensions.logexceptions=%s' % logexceptions.decode('utf-8')
             )
 
         vlog("# Using TESTDIR", _bytes2sys(self._testdir))
         vlog("# Using RUNTESTDIR", _bytes2sys(osenvironb[b'RUNTESTDIR']))
         vlog("# Using HGTMP", _bytes2sys(self._hgtmp))
         vlog("# Using PATH", os.environ["PATH"])
         vlog(
             "# Using",
             _bytes2sys(IMPL_PATH),
             _bytes2sys(osenvironb[IMPL_PATH]),
         )
         vlog("# Writing to directory", _bytes2sys(self._outputdir))
 
         if shard_total is not None:
             slot = shard_index - 1
             testdescs = [
                 t
                 for (idx, t) in enumerate(testdescs)
                 if (idx % shard_total == slot)
             ]
 
         try:
             return self._runtests(testdescs) or 0
         finally:
             time.sleep(0.1)
             self._cleanup()
 
     def findtests(self, args):
         """Finds possible test files from arguments.
 
         If you wish to inject custom tests into the test harness, this would
         be a good function to monkeypatch or override in a derived class.
         """
         if not args:
             if self.options.changed:
                 proc = Popen4(
                     b'hg st --rev "%s" -man0 .'
                     % _sys2bytes(self.options.changed),
                     None,
                     0,
                 )
                 stdout, stderr = proc.communicate()
                 args = stdout.strip(b'\0').split(b'\0')
             else:
                 args = os.listdir(b'.')
 
         expanded_args = []
         for arg in args:
             if os.path.isdir(arg):
                 if not arg.endswith(b'/'):
                     arg += b'/'
                 expanded_args.extend([arg + a for a in os.listdir(arg)])
             else:
                 expanded_args.append(arg)
         args = expanded_args
 
         testcasepattern = re.compile(br'([\w-]+\.t|py)(?:#([a-zA-Z0-9_\-.#]+))')
         tests = []
         for t in args:
             case = []
 
             if not (
                 os.path.basename(t).startswith(b'test-')
                 and (t.endswith(b'.py') or t.endswith(b'.t'))
             ):
                 m = testcasepattern.match(os.path.basename(t))
                 if m is not None:
                     t_basename, casestr = m.groups()
                     t = os.path.join(os.path.dirname(t), t_basename)
                     if casestr:
                         case = casestr.split(b'#')
                 else:
                     continue
 
             if t.endswith(b'.t'):
                 # .t file may contain multiple test cases
                 casedimensions = parsettestcases(t)
                 if casedimensions:
                     cases = []
 
                     def addcases(case, casedimensions):
                         if not casedimensions:
                             cases.append(case)
                         else:
                             for c in casedimensions[0]:
                                 addcases(case + [c], casedimensions[1:])
 
                     addcases([], casedimensions)
                     if case and case in cases:
                         cases = [case]
                     elif case:
                         # Ignore invalid cases
                         cases = []
                     else:
                         pass
                     tests += [{'path': t, 'case': c} for c in sorted(cases)]
                 else:
                     tests.append({'path': t})
             else:
                 tests.append({'path': t})
 
         if self.options.retest:
             retest_args = []
             for test in tests:
                 errpath = self._geterrpath(test)
                 if os.path.exists(errpath):
                     retest_args.append(test)
             tests = retest_args
         return tests
 
     def _runtests(self, testdescs):
         def _reloadtest(test, i):
             # convert a test back to its description dict
             desc = {'path': test.path}
             case = getattr(test, '_case', [])
             if case:
                 desc['case'] = case
             return self._gettest(desc, i)
 
         try:
             if self.options.restart:
                 orig = list(testdescs)
                 while testdescs:
                     desc = testdescs[0]
                     errpath = self._geterrpath(desc)
                     if os.path.exists(errpath):
                         break
                     testdescs.pop(0)
                 if not testdescs:
                     print("running all tests")
                     testdescs = orig
 
             tests = [self._gettest(d, i) for i, d in enumerate(testdescs)]
             num_tests = len(tests) * self.options.runs_per_test
 
             jobs = min(num_tests, self.options.jobs)
 
             failed = False
             kws = self.options.keywords
             if kws is not None:
                 kws = kws.encode('utf-8')
 
             suite = TestSuite(
                 self._testdir,
                 jobs=jobs,
                 whitelist=self.options.whitelisted,
                 blacklist=self.options.blacklist,
                 keywords=kws,
                 loop=self.options.loop,
                 runs_per_test=self.options.runs_per_test,
                 showchannels=self.options.showchannels,
                 tests=tests,
                 loadtest=_reloadtest,
             )
             verbosity = 1
             if self.options.list_tests:
                 verbosity = 0
             elif self.options.verbose:
                 verbosity = 2
             runner = TextTestRunner(self, verbosity=verbosity)
 
             osenvironb.pop(b'PYOXIDIZED_IN_MEMORY_RSRC', None)
             osenvironb.pop(b'PYOXIDIZED_FILESYSTEM_RSRC', None)
 
             if self.options.list_tests:
                 result = runner.listtests(suite)
             else:
                 install_start_time = time.monotonic()
                 self._usecorrectpython()
                 if self._installdir:
                     self._installhg()
                     self._checkhglib("Testing")
                 if self.options.chg:
                     assert self._installdir
                     self._installchg()
                 if self.options.rhg:
                     assert self._installdir
                     self._installrhg()
                 elif self.options.pyoxidized:
                     self._build_pyoxidized()
                 self._use_correct_mercurial()
                 install_end_time = time.monotonic()
                 if self._installdir:
                     msg = 'installed Mercurial in %.2f seconds'
                     msg %= install_end_time - install_start_time
                     log(msg)
 
                 log(
                     'running %d tests using %d parallel processes'
                     % (num_tests, jobs)
                 )
 
                 result = runner.run(suite)
 
             if result.failures or result.errors:
                 failed = True
 
             result.onEnd()
 
             if self.options.anycoverage:
                 self._outputcoverage()
         except KeyboardInterrupt:
             failed = True
             print("\ninterrupted!")
 
         if failed:
             return 1
 
     def _geterrpath(self, test):
         # test['path'] is a relative path
         if 'case' in test:
             # for multiple dimensions test cases
             casestr = b'#'.join(test['case'])
             errpath = b'%s#%s.err' % (test['path'], casestr)
         else:
             errpath = b'%s.err' % test['path']
         if self.options.outputdir:
             self._outputdir = canonpath(_sys2bytes(self.options.outputdir))
             errpath = os.path.join(self._outputdir, errpath)
         return errpath
 
     def _getport(self, count):
         port = self._ports.get(count)  # do we have a cached entry?
         if port is None:
-            portneeded = 4
+            portneeded = HGPORT_COUNT
             # above 100 tries we just give up and let test reports failure
             for tries in range(100):
                 allfree = True
                 port = self.options.port + self._portoffset
                 for idx in range(portneeded):
                     if not checkportisavailable(port + idx):
                         allfree = False
                         break
                 self._portoffset += portneeded
                 if allfree:
                     break
             self._ports[count] = port
         return port
 
     def _gettest(self, testdesc, count):
         """Obtain a Test by looking at its filename.
 
         Returns a Test instance. The Test may not be runnable if it doesn't
         map to a known type.
         """
         path = testdesc['path']
         lctest = path.lower()
         testcls = Test
 
         for ext, cls in self.TESTTYPES:
             if lctest.endswith(ext):
                 testcls = cls
                 break
 
         refpath = os.path.join(getcwdb(), path)
         tmpdir = os.path.join(self._hgtmp, b'child%d' % count)
 
         # extra keyword parameters. 'case' is used by .t tests
         kwds = {k: testdesc[k] for k in ['case'] if k in testdesc}
 
         t = testcls(
             refpath,
             self._outputdir,
             tmpdir,
             keeptmpdir=self.options.keep_tmpdir,
             debug=self.options.debug,
             first=self.options.first,
             timeout=self.options.timeout,
             startport=self._getport(count),
             extraconfigopts=self.options.extra_config_opt,
             shell=self.options.shell,
             hgcommand=self._hgcommand,
             usechg=bool(self.options.with_chg or self.options.chg),
             chgdebug=self.options.chg_debug,
             useipv6=useipv6,
             **kwds,
         )
         t.should_reload = True
         return t
 
     def _cleanup(self):
         """Clean up state from this test invocation."""
         if self.options.keep_tmpdir:
             return
 
         vlog("# Cleaning up HGTMP", _bytes2sys(self._hgtmp))
         shutil.rmtree(self._hgtmp, True)
         for f in self._createdfiles:
             try:
                 os.remove(f)
             except OSError:
                 pass
 
     def _usecorrectpython(self):
         """Configure the environment to use the appropriate Python in tests."""
         # Tests must use the same interpreter as us or bad things will happen.
         pyexe_names = [b'python', b'python3']
 
         # os.symlink() is a thing with py3 on Windows, but it requires
         # Administrator rights.
         if not WINDOWS and getattr(os, 'symlink', None):
             msg = "# Making python executable in test path a symlink to '%s'"
             msg %= sysexecutable
             vlog(msg)
             for pyexename in pyexe_names:
                 mypython = os.path.join(self._custom_bin_dir, pyexename)
                 try:
                     if os.readlink(mypython) == sysexecutable:
                         continue
                     os.unlink(mypython)
                 except FileNotFoundError:
                     pass
                 if self._findprogram(pyexename) != sysexecutable:
                     try:
                         os.symlink(sysexecutable, mypython)
                         self._createdfiles.append(mypython)
                     except FileExistsError:
                         # child processes may race, which is harmless
                         pass
         elif WINDOWS and not os.getenv('MSYSTEM'):
             raise AssertionError('cannot run test on Windows without MSYSTEM')
         else:
             # Generate explicit file instead of symlink
             #
             # This is especially important as Windows doesn't have
             # `python3.exe`, and MSYS cannot understand the reparse point with
             # that name provided by Microsoft.  Create a simple script on PATH
             # with that name that delegates to the py3 launcher so the shebang
             # lines work.
             esc_executable = _sys2bytes(shellquote(sysexecutable))
             for pyexename in pyexe_names:
                 stub_exec_path = os.path.join(self._custom_bin_dir, pyexename)
                 with open(stub_exec_path, 'wb') as f:
                     f.write(b'#!/bin/sh\n')
                     f.write(b'%s "$@"\n' % esc_executable)
 
             if WINDOWS:
                 # adjust the path to make sur the main python finds itself and
                 # its own dll
                 path = os.environ['PATH'].split(os.pathsep)
                 main_exec_dir = os.path.dirname(sysexecutable)
                 extra_paths = [_bytes2sys(self._custom_bin_dir), main_exec_dir]
 
                 # Binaries installed by pip into the user area like pylint.exe may
                 # not be in PATH by default.
                 appdata = os.environ.get('APPDATA')
                 vi = sys.version_info
                 if appdata is not None:
                     python_dir = 'Python%d%d' % (vi[0], vi[1])
                     scripts_path = [appdata, 'Python', python_dir, 'Scripts']
                     scripts_dir = os.path.join(*scripts_path)
                     extra_paths.append(scripts_dir)
 
                 os.environ['PATH'] = os.pathsep.join(extra_paths + path)
 
     def _use_correct_mercurial(self):
         target_exec = os.path.join(self._custom_bin_dir, b'hg')
         if self._hgcommand != b'hg':
             # shutil.which only accept bytes from 3.8
             real_exec = which(self._hgcommand)
             if real_exec is None:
                 raise ValueError('could not find exec path for "%s"', real_exec)
             if real_exec == target_exec:
                 # do not overwrite something with itself
                 return
             if WINDOWS:
                 with open(target_exec, 'wb') as f:
                     f.write(b'#!/bin/sh\n')
                     escaped_exec = shellquote(_bytes2sys(real_exec))
                     f.write(b'%s "$@"\n' % _sys2bytes(escaped_exec))
             else:
                 os.symlink(real_exec, target_exec)
             self._createdfiles.append(target_exec)
 
     def _install_hg_cmd_wheel(self):
         wheel_path = self.options.wheel
         assert wheel_path
 
         # TODO: actually use these flag later, to double check the wheel we
         # installed match our intend (in `_checkhglib`)
         if self.options.pure:
             assert False, b"--pure"
         elif self.options.rust:
             assert False, b"--rust"
         elif self.options.no_rust:
             assert False, b"--no-rust"
 
         script = _sys2bytes(os.path.realpath(sys.argv[0]))
         exe = _sys2bytes(sysexecutable)
         hgroot = os.path.dirname(os.path.dirname(script))
         self._hgroot = hgroot
         os.chdir(hgroot)
         cmd = [
             exe,
             b"-m",
             b"pip",
             b"install",
             wheel_path,
             b"--force",
             b"--ignore-installed",
             b"--prefix",
             self._installdir,
         ]
         if not WINDOWS:
             # windows does not have this flag apparently.
             cmd.append(b"--break-system-packages")
 
         return cmd
 
     def _install_hg_cmd_setup(self):
         # Run installer in hg root
         setup_opts = b""
         if self.options.pure:
             setup_opts = b"--pure"
         elif self.options.rust:
             setup_opts = b"--rust"
         elif self.options.no_rust:
             setup_opts = b"--no-rust"
 
         script = _sys2bytes(os.path.realpath(sys.argv[0]))
         exe = _sys2bytes(sysexecutable)
         hgroot = os.path.dirname(os.path.dirname(script))
         self._hgroot = hgroot
         os.chdir(hgroot)
         cmd = [
             exe,
             b"setup.py",
         ]
         if setup_opts:
             cmd.append(setup_opts)
         cmd.extend(
             [
                 b"clean",
                 b"--all",
                 b"build",
             ]
         )
         if self.options.compiler:
             cmd.append("--compiler")
             cmd.append(_sys2bytes(self.options.compiler))
         cmd.extend(
             [
                 b"--build-base=%s" % os.path.join(self._hgtmp, b"build"),
                 b"install",
                 b"--force",
                 b"--prefix=%s" % self._installdir,
                 b"--install-lib=%s" % self._pythondir,
                 b"--install-scripts=%s" % self._bindir,
             ]
         )
         if not WINDOWS:
             # The --home="" trick works only on OS where os.sep == '/'
             # because of a distutils convert_path() fast-path. Avoid it at
             # least on Windows for now, deal with .pydistutils.cfg bugs
             # when they happen.
             cmd.append(b"--home=")
 
         return cmd
 
     def _installhg(self):
         """Install hg into the test environment.
 
         This will also configure hg with the appropriate testing settings.
         """
         vlog("# Performing temporary installation of HG")
         install_env = original_env.copy()
         if self.options.wheel is None:
             cmd = self._install_hg_cmd_setup()
         else:
             cmd = self._install_hg_cmd_wheel()
             install_env["PYTHONUSERBASE"] = _bytes2sys(self._installdir)
 
         installerrs = os.path.join(self._hgtmp, b"install.err")
         if self.options.pure:
             install_env.pop('HGWITHRUSTEXT', None)
         elif self.options.no_rust:
             install_env.pop('HGWITHRUSTEXT', None)
 
         # setuptools requires install directories to exist.
         os.makedirs(self._pythondir, exist_ok=True)
         os.makedirs(self._bindir, exist_ok=True)
         if self.options.wheel is not None and not WINDOWS:
             # the wheel instalation location is not stable, so try to deal with
             # that to funnel it back where we need its.
             #
             # (mostly deals with Debian shenanigans)
             assert self._pythondir.endswith(b'site-packages')
             lib_dir = os.path.dirname(self._pythondir)
             dist_dir = os.path.join(lib_dir, b'dist-packages')
             os.symlink(b'./site-packages', dist_dir)
             os.symlink(b'.', os.path.join(self._installdir, b'local'))
 
         vlog("# Running", cmd)
         with open(installerrs, "wb") as logfile:
             r = subprocess.call(
                 cmd,
                 env=install_env,
                 stdout=logfile,
                 stderr=subprocess.STDOUT,
             )
         if r == 0:
             if not self.options.verbose:
                 try:
                     os.remove(installerrs)
                 except FileNotFoundError:
                     pass
         else:
             with open(installerrs, 'rb') as f:
                 for line in f:
                     sys.stdout.buffer.write(line)
             sys.exit(1)
         os.chdir(self._testdir)
 
         hgbat = os.path.join(self._bindir, b'hg.bat')
         if os.path.isfile(hgbat):
             # hg.bat expects to be put in bin/scripts while run-tests.py
             # installation layout put it in bin/ directly. Fix it
             with open(hgbat, 'rb') as f:
                 data = f.read()
             if br'"%~dp0..\python" "%~dp0hg" %*' in data:
                 data = data.replace(
                     br'"%~dp0..\python" "%~dp0hg" %*',
                     b'"%~dp0python" "%~dp0hg" %*',
                 )
                 with open(hgbat, 'wb') as f:
                     f.write(data)
             else:
                 print('WARNING: cannot fix hg.bat reference to python.exe')
 
         if self.options.anycoverage:
             custom = os.path.join(
                 osenvironb[b'RUNTESTDIR'], b'sitecustomize.py'
             )
             target = os.path.join(self._pythondir, b'sitecustomize.py')
             vlog('# Installing coverage trigger to %s' % target)
             shutil.copyfile(custom, target)
             rc = os.path.join(self._testdir, b'.coveragerc')
             vlog('# Installing coverage rc to %s' % rc)
             osenvironb[b'COVERAGE_PROCESS_START'] = rc
             covdir = os.path.join(self._installdir, b'..', b'coverage')
             try:
                 os.mkdir(covdir)
             except FileExistsError:
                 pass
 
             osenvironb[b'COVERAGE_DIR'] = covdir
 
     def _checkhglib(self, verb):
         """Ensure that the 'mercurial' package imported by python is
         the one we expect it to be.  If not, print a warning to stderr."""
         if self._pythondir_inferred:
             # The pythondir has been inferred from --with-hg flag.
             # We cannot expect anything sensible here.
             return
         expecthg = os.path.join(self._pythondir, b'mercurial')
         actualhg = self._gethgpath()
         if os.path.abspath(actualhg) != os.path.abspath(expecthg):
             sys.stderr.write(
                 'warning: %s with unexpected mercurial lib: %s\n'
                 '         (expected %s)\n' % (verb, actualhg, expecthg)
             )
 
     def _gethgpath(self):
         """Return the path to the mercurial package that is actually found by
         the current Python interpreter."""
         if self._hgpath is not None:
             return self._hgpath
 
         cmd = b'"%s" -c "import mercurial; print (mercurial.__path__[0])"'
         cmd = _bytes2sys(cmd % PYTHON)
 
         p = subprocess.Popen(cmd, stdout=subprocess.PIPE, shell=True)
         out, err = p.communicate()
 
         self._hgpath = out.strip()
 
         return self._hgpath
 
     def _installchg(self):
         """Install chg into the test environment"""
         vlog('# Performing temporary installation of CHG')
         assert os.path.dirname(self._bindir) == self._installdir
         assert self._hgroot, 'must be called after _installhg()'
         cmd = b'"%(make)s" clean install PREFIX="%(prefix)s"' % {
             b'make': b'make',  # TODO: switch by option or environment?
             b'prefix': self._installdir,
         }
         cwd = os.path.join(self._hgroot, b'contrib', b'chg')
         vlog("# Running", cmd)
         proc = subprocess.Popen(
             cmd,
             shell=True,
             cwd=cwd,
             stdin=subprocess.PIPE,
             stdout=subprocess.PIPE,
             stderr=subprocess.STDOUT,
         )
         out, _err = proc.communicate()
         if proc.returncode != 0:
             sys.stdout.buffer.write(out)
             sys.exit(1)
 
     def _installrhg(self):
         """Install rhg into the test environment"""
         vlog('# Performing temporary installation of rhg')
         assert os.path.dirname(self._bindir) == self._installdir
         assert self._hgroot, 'must be called after _installhg()'
         cmd = b'"%(make)s" install-rhg PREFIX="%(prefix)s"' % {
             b'make': b'make',  # TODO: switch by option or environment?
             b'prefix': self._installdir,
         }
         cwd = self._hgroot
         vlog("# Running", cmd)
         proc = subprocess.Popen(
             cmd,
             shell=True,
             cwd=cwd,
             stdin=subprocess.PIPE,
             stdout=subprocess.PIPE,
             stderr=subprocess.STDOUT,
         )
         out, _err = proc.communicate()
         if proc.returncode != 0:
             sys.stdout.buffer.write(out)
             sys.exit(1)
 
     def _build_pyoxidized(self):
         """build a pyoxidized version of mercurial into the test environment
 
         Ideally this function would be `install_pyoxidier` and would both build
         and install pyoxidier. However we are starting small to get pyoxidizer
         build binary to testing quickly.
         """
         vlog('# build a pyoxidized version of Mercurial')
         assert os.path.dirname(self._bindir) == self._installdir
         assert self._hgroot, 'must be called after _installhg()'
         target = b''
         if WINDOWS:
             target = b'windows'
         elif MACOS:
             target = b'macos'
 
         cmd = b'"%(make)s" pyoxidizer-%(platform)s-tests' % {
             b'make': b'make',
             b'platform': target,
         }
         cwd = self._hgroot
         vlog("# Running", cmd)
         proc = subprocess.Popen(
             _bytes2sys(cmd),
             shell=True,
             cwd=_bytes2sys(cwd),
             stdin=subprocess.PIPE,
             stdout=subprocess.PIPE,
             stderr=subprocess.STDOUT,
         )
         out, _err = proc.communicate()
         if proc.returncode != 0:
             sys.stdout.buffer.write(out)
             sys.exit(1)
 
         cmd = _bytes2sys(b"%s debuginstall -Tjson" % self._hgcommand)
         p = subprocess.Popen(cmd, stdout=subprocess.PIPE, shell=True)
         out, err = p.communicate()
 
         props = json.loads(out)[0]
 
         # Affects hghave.py
         osenvironb.pop(b'PYOXIDIZED_IN_MEMORY_RSRC', None)
         osenvironb.pop(b'PYOXIDIZED_FILESYSTEM_RSRC', None)
         if props["hgmodules"] == props["pythonexe"]:
             osenvironb[b'PYOXIDIZED_IN_MEMORY_RSRC'] = b'1'
         else:
             osenvironb[b'PYOXIDIZED_FILESYSTEM_RSRC'] = b'1'
 
     def _outputcoverage(self):
         """Produce code coverage output."""
         import coverage
 
         coverage = coverage.coverage
 
         vlog('# Producing coverage report')
         # chdir is the easiest way to get short, relative paths in the
         # output.
         os.chdir(self._hgroot)
         covdir = os.path.join(_bytes2sys(self._installdir), '..', 'coverage')
         cov = coverage(data_file=os.path.join(covdir, 'cov'))
 
         # Map install directory paths back to source directory.
         cov.config.paths['srcdir'] = ['.', _bytes2sys(self._pythondir)]
 
         cov.combine()
 
         omit = [
             _bytes2sys(os.path.join(x, b'*'))
             for x in [self._bindir, self._testdir]
         ]
         cov.report(ignore_errors=True, omit=omit)
 
         if self.options.htmlcov:
             htmldir = os.path.join(_bytes2sys(self._outputdir), 'htmlcov')
             cov.html_report(directory=htmldir, omit=omit)
         if self.options.annotate:
             adir = os.path.join(_bytes2sys(self._outputdir), 'annotated')
             if not os.path.isdir(adir):
                 os.mkdir(adir)
             cov.annotate(directory=adir, omit=omit)
 
     def _findprogram(self, program):
         """Search PATH for a executable program"""
         dpb = _sys2bytes(os.defpath)
         sepb = _sys2bytes(os.pathsep)
         for p in osenvironb.get(b'PATH', dpb).split(sepb):
             name = os.path.join(p, program)
             if WINDOWS or os.access(name, os.X_OK):
                 return _bytes2sys(name)
         return None
 
     def _checktools(self):
         """Ensure tools required to run tests are present."""
         for p in self.REQUIREDTOOLS:
             if WINDOWS and not p.endswith(b'.exe'):
                 p += b'.exe'
             found = self._findprogram(p)
             p = p.decode("utf-8")
             if found:
                 vlog("# Found prerequisite", p, "at", found)
             else:
                 print("WARNING: Did not find prerequisite tool: %s " % p)
 
 
 def aggregateexceptions(path):
     exceptioncounts = collections.Counter()
     testsbyfailure = collections.defaultdict(set)
     failuresbytest = collections.defaultdict(set)
 
     for f in os.listdir(path):
         with open(os.path.join(path, f), 'rb') as fh:
             data = fh.read().split(b'\0')
             if len(data) != 5:
                 continue
 
             exc, mainframe, hgframe, hgline, testname = data
             exc = exc.decode('utf-8')
             mainframe = mainframe.decode('utf-8')
             hgframe = hgframe.decode('utf-8')
             hgline = hgline.decode('utf-8')
             testname = testname.decode('utf-8')
 
             key = (hgframe, hgline, exc)
             exceptioncounts[key] += 1
             testsbyfailure[key].add(testname)
             failuresbytest[testname].add(key)
 
     # Find test having fewest failures for each failure.
     leastfailing = {}
     for key, tests in testsbyfailure.items():
         fewesttest = None
         fewestcount = 99999999
         for test in sorted(tests):
             if len(failuresbytest[test]) < fewestcount:
                 fewesttest = test
                 fewestcount = len(failuresbytest[test])
 
         leastfailing[key] = (fewestcount, fewesttest)
 
     # Create a combined counter so we can sort by total occurrences and
     # impacted tests.
     combined = {}
     for key in exceptioncounts:
         combined[key] = (
             exceptioncounts[key],
             len(testsbyfailure[key]),
             leastfailing[key][0],
             leastfailing[key][1],
         )
 
     return {
         'exceptioncounts': exceptioncounts,
         'total': sum(exceptioncounts.values()),
         'combined': combined,
         'leastfailing': leastfailing,
         'byfailure': testsbyfailure,
         'bytest': failuresbytest,
     }
 
 
 if __name__ == '__main__':
     if WINDOWS and not os.getenv('MSYSTEM'):
         print('cannot run test on Windows without MSYSTEM', file=sys.stderr)
         print(
             '(if you need to do so contact the mercurial devs: '
             '[e-mail])',
             file=sys.stderr,
         )
         sys.exit(255)
 
     runner = TestRunner()
 
     try:
         import msvcrt
 
         msvcrt.setmode(sys.stdin.fileno(), os.O_BINARY)
         msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)
         msvcrt.setmode(sys.stderr.fileno(), os.O_BINARY)
     except ImportError:
         pass
 
     sys.exit(runner.run(sys.argv[1:]))