run-tests: move test discovery logic into a function

The new function is easily monkeypatchable. This facilitates more
advanced test discovery by 3rd parties such as extensions.

tests/run-tests.py

@@ -1,1444 +1,1452 b''
 #!/usr/bin/env python
 #
 # run-tests.py - Run a set of tests on Mercurial
 #
 # Copyright 2006 Matt 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
 #
 # (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.)
 
 from distutils import version
 import difflib
 import errno
 import optparse
 import os
 import shutil
 import subprocess
 import signal
 import sys
 import tempfile
 import time
 import random
 import re
 import threading
 import killdaemons as killmod
 import Queue as queue
 
 processlock = threading.Lock()
 
 # subprocess._cleanup can race with any Popen.wait or Popen.poll on py24
 # http://bugs.python.org/issue1731717 for details. We shouldn't be producing
 # zombies but it's pretty harmless even if we do.
 if sys.version_info < (2, 5):
     subprocess._cleanup = lambda: None
 
 closefds = os.name == 'posix'
 def Popen4(cmd, wd, timeout, env=None):
     processlock.acquire()
     p = subprocess.Popen(cmd, shell=True, bufsize=-1, cwd=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(.1)
             p.timeout = True
             if p.returncode is None:
                 terminate(p)
         threading.Thread(target=t).start()
 
     return p
 
 # reserved exit code to skip test (used by hghave)
 SKIPPED_STATUS = 80
 SKIPPED_PREFIX = 'skipped: '
 FAILED_PREFIX  = 'hghave check failed: '
 PYTHON = sys.executable.replace('\\', '/')
 IMPL_PATH = 'PYTHONPATH'
 if 'java' in sys.platform:
     IMPL_PATH = 'JYTHONPATH'
 
 TESTDIR = HGTMP = INST = BINDIR = TMPBINDIR = PYTHONDIR = None
 
 requiredtools = [os.path.basename(sys.executable), "diff", "grep", "unzip",
                  "gunzip", "bunzip2", "sed"]
 defaults = {
     'jobs': ('HGTEST_JOBS', 1),
     'timeout': ('HGTEST_TIMEOUT', 180),
     'port': ('HGTEST_PORT', 20059),
     'shell': ('HGTEST_SHELL', 'sh'),
 }
 
 def parselistfiles(files, listtype, warn=True):
     entries = dict()
     for filename in files:
         try:
             path = os.path.expanduser(os.path.expandvars(filename))
             f = open(path, "r")
         except IOError, err:
             if err.errno != errno.ENOENT:
                 raise
             if warn:
                 print "warning: no such %s file: %s" % (listtype, filename)
             continue
 
         for line in f.readlines():
             line = line.split('#', 1)[0].strip()
             if line:
                 entries[line] = filename
 
         f.close()
     return entries
 
 def getparser():
     parser = optparse.OptionParser("%prog [options] [tests]")
 
     # keep these sorted
     parser.add_option("--blacklist", action="append",
         help="skip tests listed in the specified blacklist file")
     parser.add_option("--whitelist", action="append",
         help="always run tests listed in the specified whitelist file")
     parser.add_option("--changed", type="string",
         help="run tests that are changed in parent rev or working directory")
     parser.add_option("-C", "--annotate", action="store_true",
         help="output files annotated with coverage")
     parser.add_option("-c", "--cover", action="store_true",
         help="print a test coverage report")
     parser.add_option("-d", "--debug", action="store_true",
         help="debug mode: write output of test scripts to console"
              " rather than capturing and diffing it (disables timeout)")
     parser.add_option("-f", "--first", action="store_true",
         help="exit on the first test failure")
     parser.add_option("-H", "--htmlcov", action="store_true",
         help="create an HTML report of the coverage of the files")
     parser.add_option("-i", "--interactive", action="store_true",
         help="prompt to accept changed output")
     parser.add_option("-j", "--jobs", type="int",
         help="number of jobs to run in parallel"
              " (default: $%s or %d)" % defaults['jobs'])
     parser.add_option("--keep-tmpdir", action="store_true",
         help="keep temporary directory after running tests")
     parser.add_option("-k", "--keywords",
         help="run tests matching keywords")
     parser.add_option("-l", "--local", action="store_true",
         help="shortcut for --with-hg=<testdir>/../hg")
     parser.add_option("--loop", action="store_true",
         help="loop tests repeatedly")
     parser.add_option("-n", "--nodiff", action="store_true",
         help="skip showing test changes")
     parser.add_option("-p", "--port", type="int",
         help="port on which servers should listen"
              " (default: $%s or %d)" % defaults['port'])
     parser.add_option("--compiler", type="string",
         help="compiler to build with")
     parser.add_option("--pure", action="store_true",
         help="use pure Python code instead of C extensions")
     parser.add_option("-R", "--restart", action="store_true",
         help="restart at last error")
     parser.add_option("-r", "--retest", action="store_true",
         help="retest failed tests")
     parser.add_option("-S", "--noskips", action="store_true",
         help="don't report skip tests verbosely")
     parser.add_option("--shell", type="string",
         help="shell to use (default: $%s or %s)" % defaults['shell'])
     parser.add_option("-t", "--timeout", type="int",
         help="kill errant tests after TIMEOUT seconds"
              " (default: $%s or %d)" % defaults['timeout'])
     parser.add_option("--time", action="store_true",
         help="time how long each test takes")
     parser.add_option("--tmpdir", type="string",
         help="run tests in the given temporary directory"
              " (implies --keep-tmpdir)")
     parser.add_option("-v", "--verbose", action="store_true",
         help="output verbose messages")
     parser.add_option("--view", type="string",
         help="external diff viewer")
     parser.add_option("--with-hg", type="string",
         metavar="HG",
         help="test using specified hg script rather than a "
              "temporary installation")
     parser.add_option("-3", "--py3k-warnings", action="store_true",
         help="enable Py3k warnings on Python 2.6+")
     parser.add_option('--extra-config-opt', action="append",
                       help='set the given config opt in the test hgrc')
     parser.add_option('--random', action="store_true",
                       help='run tests in random order')
 
     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):
     (options, args) = parser.parse_args(args)
 
     # jython is always pure
     if 'java' in sys.platform or '__pypy__' in sys.modules:
         options.pure = True
 
     if options.with_hg:
         options.with_hg = os.path.expanduser(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 not os.path.basename(options.with_hg) == 'hg':
             sys.stderr.write('warning: --with-hg should specify an hg script\n')
     if options.local:
         testdir = os.path.dirname(os.path.realpath(sys.argv[0]))
         hgbin = os.path.join(os.path.dirname(testdir), 'hg')
         if os.name != 'nt' and not os.access(hgbin, os.X_OK):
             parser.error('--local specified, but %r not found or not executable'
                          % hgbin)
         options.with_hg = hgbin
 
     options.anycoverage = options.cover or options.annotate or options.htmlcov
     if options.anycoverage:
         try:
             import coverage
             covver = version.StrictVersion(coverage.__version__).version
             if covver < (3, 3):
                 parser.error('coverage options require coverage 3.3 or later')
         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")
 
     global verbose
     if options.verbose:
         verbose = ''
 
     if options.tmpdir:
         options.tmpdir = os.path.expanduser(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')
         options.timeout = 0
     if options.py3k_warnings:
         if sys.version_info[:2] < (2, 6) or sys.version_info[:2] >= (3, 0):
             parser.error('--py3k-warnings can only be used on Python 2.6+')
     if options.blacklist:
         options.blacklist = parselistfiles(options.blacklist, 'blacklist')
     if options.whitelist:
         options.whitelisted = parselistfiles(options.whitelist, 'whitelist')
     else:
         options.whitelisted = {}
 
     return (options, args)
 
 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 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(SKIPPED_PREFIX):
             line = line.splitlines()[0]
             missing.append(line[len(SKIPPED_PREFIX):])
         elif line.startswith(FAILED_PREFIX):
             line = line.splitlines()[0]
             failed.append(line[len(FAILED_PREFIX):])
 
     return missing, failed
 
 def showdiff(expected, output, ref, err):
     print
     servefail = False
     for line in difflib.unified_diff(expected, output, ref, err):
         sys.stdout.write(line)
         if not servefail and line.startswith(
                              '+  abort: child process failed to start'):
             servefail = True
     return {'servefail': servefail}
 
 
 verbose = False
 def vlog(*msg):
     if verbose is not False:
         iolock.acquire()
         if verbose:
             print verbose,
         for m in msg:
             print m,
         print
         sys.stdout.flush()
         iolock.release()
 
 def log(*msg):
     iolock.acquire()
     if verbose:
         print verbose,
     for m in msg:
         print m,
     print
     sys.stdout.flush()
     iolock.release()
 
 def findprogram(program):
     """Search PATH for a executable program"""
     for p in os.environ.get('PATH', os.defpath).split(os.pathsep):
         name = os.path.join(p, program)
         if os.name == 'nt' or os.access(name, os.X_OK):
             return name
     return None
 
 def createhgrc(path, options):
     # create a fresh hgrc
     hgrc = open(path, 'w')
     hgrc.write('[ui]\n')
     hgrc.write('slash = True\n')
     hgrc.write('interactive = False\n')
     hgrc.write('[defaults]\n')
     hgrc.write('backout = -d "0 0"\n')
     hgrc.write('commit = -d "0 0"\n')
     hgrc.write('shelve = --date "0 0"\n')
     hgrc.write('tag = -d "0 0"\n')
     if options.extra_config_opt:
         for opt in options.extra_config_opt:
             section, key = opt.split('.', 1)
             assert '=' in key, ('extra config opt %s must '
                                 'have an = for assignment' % opt)
             hgrc.write('[%s]\n%s\n' % (section, key))
     hgrc.close()
 
 def checktools():
     # Before we go any further, check for pre-requisite tools
     # stuff from coreutils (cat, rm, etc) are not tested
     for p in requiredtools:
         if os.name == 'nt' and not p.endswith('.exe'):
             p += '.exe'
         found = findprogram(p)
         if found:
             vlog("# Found prerequisite", p, "at", found)
         else:
             print "WARNING: Did not find prerequisite tool: "+p
 
 def terminate(proc):
     """Terminate subprocess (with fallback for Python versions < 2.6)"""
     vlog('# Terminating process %d' % proc.pid)
     try:
         getattr(proc, 'terminate', lambda : os.kill(proc.pid, signal.SIGTERM))()
     except OSError:
         pass
 
 def killdaemons(pidfile):
     return killmod.killdaemons(pidfile, tryhard=False, remove=True,
                                logfn=vlog)
 
 class Test(object):
     """Encapsulates a single, runnable test.
 
     Test instances can be run multiple times via run(). However, multiple
     runs cannot be run concurrently.
     """
 
     def __init__(self, runner, test, count, refpath):
         path = os.path.join(runner.testdir, test)
         errpath = os.path.join(runner.testdir, '%s.err' % test)
 
         self._runner = runner
         self._testdir = runner.testdir
         self._test = test
         self._path = path
         self._options = runner.options
         self._count = count
         self._daemonpids = []
         self._refpath = refpath
         self._errpath = errpath
 
         # If we're not in --debug mode and reference output file exists,
         # check test output against it.
         if runner.options.debug:
             self._refout = None # to match "out is None"
         elif os.path.exists(refpath):
             f = open(refpath, 'r')
             self._refout = f.read().splitlines(True)
             f.close()
         else:
             self._refout = []
 
         self._threadtmp = os.path.join(runner.hgtmp, 'child%d' % count)
         os.mkdir(self._threadtmp)
 
     def cleanup(self):
         for entry in self._daemonpids:
             killdaemons(entry)
 
         if self._threadtmp and not self._options.keep_tmpdir:
             shutil.rmtree(self._threadtmp, True)
 
     def run(self):
         if not os.path.exists(self._path):
             return self.skip("Doesn't exist")
 
         options = self._options
         if not (options.whitelisted and self._test in options.whitelisted):
             if options.blacklist and self._test in options.blacklist:
                 return self.skip('blacklisted')
 
             if options.retest and not os.path.exists('%s.err' % self._test):
                 return self.ignore('not retesting')
 
             if options.keywords:
                 f = open(self._test)
                 t = f.read().lower() + self._test.lower()
                 f.close()
                 for k in options.keywords.lower().split():
                     if k in t:
                         break
                     else:
                         return self.ignore("doesn't match keyword")
 
         if not os.path.basename(self._test.lower()).startswith('test-'):
             return self.skip('not a test file')
 
         # Remove any previous output files.
         if os.path.exists(self._errpath):
             os.remove(self._errpath)
 
         testtmp = os.path.join(self._threadtmp, os.path.basename(self._path))
         os.mkdir(testtmp)
         replacements, port = self._getreplacements(testtmp)
         env = self._getenv(testtmp, port)
         self._daemonpids.append(env['DAEMON_PIDS'])
         createhgrc(env['HGRCPATH'], options)
 
         vlog('# Test', self._test)
 
         starttime = time.time()
         try:
             ret, out = self._run(testtmp, replacements, env)
             duration = time.time() - starttime
         except KeyboardInterrupt:
             duration = time.time() - starttime
             log('INTERRUPTED: %s (after %d seconds)' % (self._test, duration))
             raise
         except Exception, e:
             return self.fail('Exception during execution: %s' % e, 255)
 
         killdaemons(env['DAEMON_PIDS'])
 
         if not options.keep_tmpdir:
             shutil.rmtree(testtmp)
 
         def describe(ret):
             if ret < 0:
                 return 'killed by signal: %d' % -ret
             return 'returned error code %d' % ret
 
         skipped = False
 
         if ret == SKIPPED_STATUS:
             if out is None: # Debug mode, nothing to parse.
                 missing = ['unknown']
                 failed = None
             else:
                 missing, failed = parsehghaveoutput(out)
 
             if not missing:
                 missing = ['irrelevant']
 
             if failed:
                 res = self.fail('hg have failed checking for %s' % failed[-1],
                                 ret)
             else:
                 skipped = True
                 res = self.skip(missing[-1])
         elif ret == 'timeout':
             res = self.fail('timed out', ret)
         elif out != self._refout:
             info = {}
             if not options.nodiff:
                 iolock.acquire()
                 if options.view:
                     os.system("%s %s %s" % (options.view, self._refpath,
                                             self._errpath))
                 else:
                     info = showdiff(self._refout, out, self._refpath,
                                     self._errpath)
                 iolock.release()
             msg = ''
             if info.get('servefail'):
                 msg += 'serve failed and '
             if ret:
                 msg += 'output changed and ' + describe(ret)
             else:
                 msg += 'output changed'
 
             res = self.fail(msg, ret)
         elif ret:
             res = self.fail(describe(ret), ret)
         else:
             res = self.success()
 
         if (ret != 0 or out != self._refout) and not skipped \
             and not options.debug:
             f = open(self._errpath, 'wb')
             for line in out:
                 f.write(line)
             f.close()
 
         vlog("# Ret was:", ret)
 
         if not options.verbose:
             iolock.acquire()
             sys.stdout.write(res[0])
             sys.stdout.flush()
             iolock.release()
 
         self._runner.times.append((self._test, duration))
 
         return res
 
     def _run(self, testtmp, replacements, env):
         # This should be implemented in child classes to run tests.
         return self._skip('unknown test type')
 
     def _getreplacements(self, testtmp):
         port = self._options.port + self._count * 3
         r = [
             (r':%s\b' % port, ':$HGPORT'),
             (r':%s\b' % (port + 1), ':$HGPORT1'),
             (r':%s\b' % (port + 2), ':$HGPORT2'),
             ]
 
         if os.name == 'nt':
             r.append(
                 (''.join(c.isalpha() and '[%s%s]' % (c.lower(), c.upper()) or
                     c in '/\\' and r'[/\\]' or c.isdigit() and c or '\\' + c
                     for c in testtmp), '$TESTTMP'))
         else:
             r.append((re.escape(testtmp), '$TESTTMP'))
 
         return r, port
 
     def _getenv(self, testtmp, port):
         env = os.environ.copy()
         env['TESTTMP'] = testtmp
         env['HOME'] = testtmp
         env["HGPORT"] = str(port)
         env["HGPORT1"] = str(port + 1)
         env["HGPORT2"] = str(port + 2)
         env["HGRCPATH"] = os.path.join(self._threadtmp, '.hgrc')
         env["DAEMON_PIDS"] = os.path.join(self._threadtmp, 'daemon.pids')
         env["HGEDITOR"] = sys.executable + ' -c "import sys; sys.exit(0)"'
         env["HGMERGE"] = "internal:merge"
         env["HGUSER"]   = "test"
         env["HGENCODING"] = "ascii"
         env["HGENCODINGMODE"] = "strict"
 
         # 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'
 
         for k in ('HG HGPROF CDPATH GREP_OPTIONS http_proxy no_proxy ' +
                   'NO_PROXY').split():
             if k in env:
                 del env[k]
 
         # unset env related to hooks
         for k in env.keys():
             if k.startswith('HG_'):
                 del env[k]
 
         return env
 
     def success(self):
         return '.', self._test, ''
 
     def fail(self, msg, ret):
         warned = ret is False
         if not self._options.nodiff:
             log("\n%s: %s %s" % (warned and 'Warning' or 'ERROR', self._test,
                                  msg))
         if (not ret and self._options.interactive and
             os.path.exists(self._errpath)):
             iolock.acquire()
             print 'Accept this change? [n] ',
             answer = sys.stdin.readline().strip()
             iolock.release()
             if answer.lower() in ('y', 'yes').split():
                 if self._test.endswith('.t'):
                     rename(self._errpath, self._testpath)
                 else:
                     rename(self._errpath, '%s.out' % self._testpath)
 
                 return '.', self._test, ''
 
         return warned and '~' or '!', self._test, msg
 
     def skip(self, msg):
         if self._options.verbose:
             log("\nSkipping %s: %s" % (self._path, msg))
 
         return 's', self._test, msg
 
     def ignore(self, msg):
         return 'i', self._test, msg
 
 class PythonTest(Test):
     """A Python-based test."""
     def _run(self, testtmp, replacements, env):
         py3kswitch = self._options.py3k_warnings and ' -3' or ''
         cmd = '%s%s "%s"' % (PYTHON, py3kswitch, self._path)
         vlog("# Running", cmd)
         if os.name == 'nt':
             replacements.append((r'\r\n', '\n'))
         return run(cmd, testtmp, self._options, replacements, env,
                    self._runner.abort)
 
 
 needescape = re.compile(r'[\x00-\x08\x0b-\x1f\x7f-\xff]').search
 escapesub = re.compile(r'[\x00-\x08\x0b-\x1f\\\x7f-\xff]').sub
 escapemap = dict((chr(i), r'\x%02x' % i) for i in range(256))
 escapemap.update({'\\': '\\\\', '\r': r'\r'})
 def escapef(m):
     return escapemap[m.group(0)]
 def stringescape(s):
     return escapesub(escapef, s)
 
 class TTest(Test):
     """A "t test" is a test backed by a .t file."""
 
     def _run(self, testtmp, replacements, env):
         f = open(self._path)
         lines = f.readlines()
         f.close()
 
         salt, script, after, expected = self._parsetest(lines, testtmp)
 
         # Write out the generated script.
         fname = '%s.sh' % testtmp
         f = open(fname, 'w')
         for l in script:
             f.write(l)
         f.close()
 
         cmd = '%s "%s"' % (self._options.shell, fname)
         vlog("# Running", cmd)
 
         exitcode, output = run(cmd, testtmp, self._options, replacements, env,
                                self._runner.abort)
         # Do not merge output if skipped. Return hghave message instead.
         # Similarly, with --debug, output is None.
         if exitcode == SKIPPED_STATUS or output is None:
             return exitcode, output
 
         return self._processoutput(exitcode, output, salt, after, expected)
 
     def _hghave(self, reqs, testtmp):
         # TODO do something smarter when all other uses of hghave are gone.
         tdir = self._testdir.replace('\\', '/')
         proc = Popen4('%s -c "%s/hghave %s"' %
                       (self._options.shell, tdir, ' '.join(reqs)),
                       testtmp, 0)
         stdout, stderr = proc.communicate()
         ret = proc.wait()
         if wifexited(ret):
             ret = os.WEXITSTATUS(ret)
         if ret == 2:
             print stdout
             sys.exit(1)
 
         return ret == 0
 
     def _parsetest(self, lines, testtmp):
         # 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 = "SALT" + str(time.time())
         def addsalt(line, inpython):
             if inpython:
                 script.append('%s %d 0\n' % (salt, line))
             else:
                 script.append('echo %s %s $?\n' % (salt, line))
 
         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
 
         # True or False when in a true or false conditional section
         skipping = None
 
         # 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._options.debug:
             script.append('set -x\n')
         if os.getenv('MSYSTEM'):
             script.append('alias pwd="pwd -W"\n')
 
         for n, l in enumerate(lines):
             if not l.endswith('\n'):
                 l += '\n'
             if l.startswith('#if'):
                 lsplit = l.split()
                 if len(lsplit) < 2 or lsplit[0] != '#if':
                     after.setdefault(pos, []).append('  !!! invalid #if\n')
                 if skipping is not None:
                     after.setdefault(pos, []).append('  !!! nested #if\n')
                 skipping = not self._hghave(lsplit[1:], testtmp)
                 after.setdefault(pos, []).append(l)
             elif l.startswith('#else'):
                 if skipping is None:
                     after.setdefault(pos, []).append('  !!! missing #if\n')
                 skipping = not skipping
                 after.setdefault(pos, []).append(l)
             elif l.startswith('#endif'):
                 if skipping is None:
                     after.setdefault(pos, []).append('  !!! missing #if\n')
                 skipping = None
                 after.setdefault(pos, []).append(l)
             elif skipping:
                 after.setdefault(pos, []).append(l)
             elif l.startswith('  >>> '): # 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('%s -m heredoctest <<EOF\n' % PYTHON)
                 addsalt(n, True)
                 script.append(l[2:])
             elif l.startswith('  ... '): # python inlines
                 after.setdefault(prepos, []).append(l)
                 script.append(l[2:])
             elif l.startswith('  $ '): # commands
                 if inpython:
                     script.append('EOF\n')
                     inpython = False
                 after.setdefault(pos, []).append(l)
                 prepos = pos
                 pos = n
                 addsalt(n, False)
                 cmd = l[4:].split()
                 if len(cmd) == 2 and cmd[0] == 'cd':
                     l = '  $ cd %s || exit 1\n' % cmd[1]
                 script.append(l[4:])
             elif l.startswith('  > '): # continuations
                 after.setdefault(prepos, []).append(l)
                 script.append(l[4:])
             elif l.startswith('  '): # results
                 # Queue up a list of expected results.
                 expected.setdefault(pos, []).append(l[2:])
             else:
                 if inpython:
                     script.append('EOF\n')
                     inpython = False
                 # Non-command/result. Queue up for merged output.
                 after.setdefault(pos, []).append(l)
 
         if inpython:
             script.append('EOF\n')
         if skipping is not None:
             after.setdefault(pos, []).append('  !!! missing #endif\n')
         addsalt(n + 1, False)
 
         return salt, script, after, expected
 
     def _processoutput(self, exitcode, output, salt, after, expected):
         # Merge the script output back into a unified test.
         warnonly = 1 # 1: not yet; 2: yes; 3: for sure not
         if exitcode != 0:
             warnonly = 3
 
         pos = -1
         postout = []
         for l in output:
             lout, lcmd = l, None
             if salt in l:
                 lout, lcmd = l.split(salt, 1)
 
             if lout:
                 if not lout.endswith('\n'):
                     lout += ' (no-eol)\n'
 
                 # Find the expected output at the current position.
                 el = None
                 if expected.get(pos, None):
                     el = expected[pos].pop(0)
 
                 r = TTest.linematch(el, lout)
                 if isinstance(r, str):
                     if r == '+glob':
                         lout = el[:-1] + ' (glob)\n'
                         r = '' # Warn only this line.
                     elif r == '-glob':
                         lout = ''.join(el.rsplit(' (glob)', 1))
                         r = '' # Warn only this line.
                     else:
                         log('\ninfo, unknown linematch result: %r\n' % r)
                         r = False
                 if r:
                     postout.append('  ' + el)
                 else:
                     if needescape(lout):
                         lout = stringescape(lout.rstrip('\n')) + ' (esc)\n'
                     postout.append('  ' + lout) # Let diff deal with it.
                     if r != '': # If line failed.
                         warnonly = 3 # for sure not
                     elif warnonly == 1: # Is "not yet" and line is warn only.
                         warnonly = 2 # Yes do warn.
 
             if lcmd:
                 # Add on last return code.
                 ret = int(lcmd.split()[1])
                 if ret != 0:
                     postout.append('  [%s]\n' % ret)
                 if pos in after:
                     # Merge in non-active test bits.
                     postout += after.pop(pos)
                 pos = int(lcmd.split()[0])
 
         if pos in after:
             postout += after.pop(pos)
 
         if warnonly == 2:
             exitcode = False # Set exitcode to warned.
 
         return exitcode, postout
 
     @staticmethod
     def rematch(el, l):
         try:
             # use \Z to ensure that the regex matches to the end of the string
             if os.name == 'nt':
                 return re.match(el + r'\r?\n\Z', l)
             return re.match(el + r'\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 + '\n' == l:
             if os.altsep:
                 # matching on "/" is not needed for this line
                 return '-glob'
             return True
         i, n = 0, len(el)
         res = ''
         while i < n:
             c = el[i]
             i += 1
             if c == '\\' and el[i] in '*?\\/':
                 res += el[i - 1:i + 1]
                 i += 1
             elif c == '*':
                 res += '.*'
             elif c == '?':
                 res += '.'
             elif c == '/' and os.altsep:
                 res += '[/\\\\]'
             else:
                 res += re.escape(c)
         return TTest.rematch(res, l)
 
     @staticmethod
     def linematch(el, l):
         if el == l: # perfect match (fast)
             return True
         if el:
             if el.endswith(" (esc)\n"):
                 el = el[:-7].decode('string-escape') + '\n'
             if el == l or os.name == 'nt' and el[:-1] + '\r\n' == l:
                 return True
             if el.endswith(" (re)\n"):
                 return TTest.rematch(el[:-6], l)
             if el.endswith(" (glob)\n"):
                 return TTest.globmatch(el[:-8], l)
             if os.altsep and l.replace('\\', '/') == el:
                 return '+glob'
         return False
 
 wifexited = getattr(os, "WIFEXITED", lambda x: False)
 def run(cmd, wd, options, replacements, env, abort):
     """Run command in a sub-process, capturing the output (stdout and stderr).
     Return a tuple (exitcode, output).  output is None in debug mode."""
     # TODO: Use subprocess.Popen if we're running on Python 2.4
     if options.debug:
         proc = subprocess.Popen(cmd, shell=True, cwd=wd, env=env)
         ret = proc.wait()
         return (ret, None)
 
     proc = Popen4(cmd, wd, options.timeout, env)
     def cleanup():
         terminate(proc)
         ret = proc.wait()
         if ret == 0:
             ret = signal.SIGTERM << 8
         killdaemons(env['DAEMON_PIDS'])
         return ret
 
     output = ''
     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'])
 
     if abort[0]:
         raise KeyboardInterrupt()
 
     for s, r in replacements:
         output = re.sub(s, r, output)
     return ret, output.splitlines(True)
 
 _hgpath = None
 
 def _gethgpath():
     """Return the path to the mercurial package that is actually found by
     the current Python interpreter."""
     global _hgpath
     if _hgpath is not None:
         return _hgpath
 
     cmd = '%s -c "import mercurial; print (mercurial.__path__[0])"'
     pipe = os.popen(cmd % PYTHON)
     try:
         _hgpath = pipe.read().strip()
     finally:
         pipe.close()
     return _hgpath
 
 iolock = threading.Lock()
 
 class TestRunner(object):
     """Holds context for executing tests.
 
     Tests rely on a lot of state. This object holds it for them.
     """
 
     TESTTYPES = [
         ('.py', PythonTest, '.out'),
         ('.t', TTest, ''),
     ]
 
     def __init__(self):
         self.options = None
         self.testdir = None
         self.hgtmp = None
         self.inst = None
         self.bindir = None
         self.tmpbinddir = None
         self.pythondir = None
         self.coveragefile = None
         self.times = [] # Holds execution times of tests.
         self.results = {
             '.': [],
             '!': [],
             '~': [],
             's': [],
             'i': [],
         }
         self.abort = [False]
         self._createdfiles = []
 
+    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('hg st --rev "%s" -man0 .' %
+                              self.options.changed, None, 0)
+                stdout, stderr = proc.communicate()
+                args = stdout.strip('\0').split('\0')
+            else:
+                args = os.listdir('.')
+
+        return [t for t in args
+                if os.path.basename(t).startswith('test-')
+                    and (t.endswith('.py') or t.endswith('.t'))]
+
     def runtests(self, tests):
         try:
             if self.inst:
                 self.installhg()
                 self.checkhglib("Testing")
             else:
                 self.usecorrectpython()
 
             if self.options.restart:
                 orig = list(tests)
                 while tests:
                     if os.path.exists(tests[0] + ".err"):
                         break
                     tests.pop(0)
                 if not tests:
                     print "running all tests"
                     tests = orig
 
             self._executetests(tests)
 
             failed = len(self.results['!'])
             warned = len(self.results['~'])
             tested = len(self.results['.']) + failed + warned
             skipped = len(self.results['s'])
             ignored = len(self.results['i'])
 
             print
             if not self.options.noskips:
                 for s in self.results['s']:
                     print "Skipped %s: %s" % s
             for s in self.results['~']:
                 print "Warned %s: %s" % s
             for s in self.results['!']:
                 print "Failed %s: %s" % s
             self.checkhglib("Tested")
             print "# Ran %d tests, %d skipped, %d warned, %d failed." % (
                 tested, skipped + ignored, warned, failed)
             if self.results['!']:
                 print 'python hash seed:', os.environ['PYTHONHASHSEED']
             if self.options.time:
                 self.outputtimes()
 
             if self.options.anycoverage:
                 self.outputcoverage()
         except KeyboardInterrupt:
             failed = True
             print "\ninterrupted!"
 
         if failed:
             return 1
         if warned:
             return 80
 
     def gettest(self, test, 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.
         """
         lctest = test.lower()
         refpath = os.path.join(self.testdir, test)
 
         testcls = Test
 
         for ext, cls, out in self.TESTTYPES:
             if lctest.endswith(ext):
                 testcls = cls
                 refpath = os.path.join(self.testdir, test + out)
                 break
 
         return testcls(self, test, count, refpath)
 
     def cleanup(self):
         """Clean up state from this test invocation."""
 
         if self.options.keep_tmpdir:
             return
 
         vlog("# Cleaning up HGTMP", self.hgtmp)
         shutil.rmtree(self.hgtmp, True)
         for f in self._createdfiles:
             try:
                 os.remove(f)
             except OSError:
                 pass
 
     def usecorrectpython(self):
         # Some tests run the Python interpreter. They must use the
         # same interpreter or bad things will happen.
         pyexename = sys.platform == 'win32' and 'python.exe' or 'python'
         if getattr(os, 'symlink', None):
             vlog("# Making python executable in test path a symlink to '%s'" %
                  sys.executable)
             mypython = os.path.join(self.tmpbindir, pyexename)
             try:
                 if os.readlink(mypython) == sys.executable:
                     return
                 os.unlink(mypython)
             except OSError, err:
                 if err.errno != errno.ENOENT:
                     raise
             if findprogram(pyexename) != sys.executable:
                 try:
                     os.symlink(sys.executable, mypython)
                     self._createdfiles.append(mypython)
                 except OSError, err:
                     # child processes may race, which is harmless
                     if err.errno != errno.EEXIST:
                         raise
         else:
             exedir, exename = os.path.split(sys.executable)
             vlog("# Modifying search path to find %s as %s in '%s'" %
                  (exename, pyexename, exedir))
             path = os.environ['PATH'].split(os.pathsep)
             while exedir in path:
                 path.remove(exedir)
             os.environ['PATH'] = os.pathsep.join([exedir] + path)
             if not findprogram(pyexename):
                 print "WARNING: Cannot find %s in search path" % pyexename
 
     def installhg(self):
         vlog("# Performing temporary installation of HG")
         installerrs = os.path.join("tests", "install.err")
         compiler = ''
         if self.options.compiler:
             compiler = '--compiler ' + self.options.compiler
         pure = self.options.pure and "--pure" or ""
         py3 = ''
         if sys.version_info[0] == 3:
             py3 = '--c2to3'
 
         # Run installer in hg root
         script = os.path.realpath(sys.argv[0])
         hgroot = os.path.dirname(os.path.dirname(script))
         os.chdir(hgroot)
         nohome = '--home=""'
         if os.name == 'nt':
             # 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.
             nohome = ''
         cmd = ('%(exe)s setup.py %(py3)s %(pure)s clean --all'
                ' build %(compiler)s --build-base="%(base)s"'
                ' install --force --prefix="%(prefix)s"'
                ' --install-lib="%(libdir)s"'
                ' --install-scripts="%(bindir)s" %(nohome)s >%(logfile)s 2>&1'
                % {'exe': sys.executable, 'py3': py3, 'pure': pure,
                   'compiler': compiler,
                   'base': os.path.join(self.hgtmp, "build"),
                   'prefix': self.inst, 'libdir': self.pythondir,
                   'bindir': self.bindir,
                   'nohome': nohome, 'logfile': installerrs})
         vlog("# Running", cmd)
         if os.system(cmd) == 0:
             if not self.options.verbose:
                 os.remove(installerrs)
         else:
             f = open(installerrs)
             for line in f:
                 print line,
             f.close()
             sys.exit(1)
         os.chdir(self.testdir)
 
         self.usecorrectpython()
 
         if self.options.py3k_warnings and not self.options.anycoverage:
             vlog("# Updating hg command to enable Py3k Warnings switch")
             f = open(os.path.join(self.bindir, 'hg'), 'r')
             lines = [line.rstrip() for line in f]
             lines[0] += ' -3'
             f.close()
             f = open(os.path.join(self.bindir, 'hg'), 'w')
             for line in lines:
                 f.write(line + '\n')
             f.close()
 
         hgbat = os.path.join(self.bindir, '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
             f = open(hgbat, 'rb')
             data = f.read()
             f.close()
             if '"%~dp0..\python" "%~dp0hg" %*' in data:
                 data = data.replace('"%~dp0..\python" "%~dp0hg" %*',
                                     '"%~dp0python" "%~dp0hg" %*')
                 f = open(hgbat, 'wb')
                 f.write(data)
                 f.close()
             else:
                 print 'WARNING: cannot fix hg.bat reference to python.exe'
 
         if self.options.anycoverage:
             custom = os.path.join(self.testdir, 'sitecustomize.py')
             target = os.path.join(self.pythondir, 'sitecustomize.py')
             vlog('# Installing coverage trigger to %s' % target)
             shutil.copyfile(custom, target)
             rc = os.path.join(self.testdir, '.coveragerc')
             vlog('# Installing coverage rc to %s' % rc)
             os.environ['COVERAGE_PROCESS_START'] = rc
             fn = os.path.join(self.inst, '..', '.coverage')
             os.environ['COVERAGE_FILE'] = fn
 
     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."""
         expecthg = os.path.join(self.pythondir, 'mercurial')
         actualhg = _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 outputtimes(self):
         vlog('# Producing time report')
         self.times.sort(key=lambda t: (t[1], t[0]), reverse=True)
         cols = '%7.3f   %s'
         print '\n%-7s   %s' % ('Time', 'Test')
         for test, timetaken in self.times:
             print cols % (timetaken, test)
 
     def outputcoverage(self):
         vlog('# Producing coverage report')
         os.chdir(self.pythondir)
 
         def covrun(*args):
             cmd = 'coverage %s' % ' '.join(args)
             vlog('# Running: %s' % cmd)
             os.system(cmd)
 
         covrun('-c')
         omit = ','.join(os.path.join(x, '*') for x in
                         [self.bindir, self.testdir])
         covrun('-i', '-r', '"--omit=%s"' % omit) # report
         if self.options.htmlcov:
             htmldir = os.path.join(self.testdir, 'htmlcov')
             covrun('-i', '-b', '"--directory=%s"' % htmldir,
                    '"--omit=%s"' % omit)
         if self.options.annotate:
             adir = os.path.join(self.testdir, 'annotated')
             if not os.path.isdir(adir):
                 os.mkdir(adir)
             covrun('-i', '-a', '"--directory=%s"' % adir, '"--omit=%s"' % omit)
 
     def _executetests(self, tests):
         jobs = self.options.jobs
         done = queue.Queue()
         running = 0
         count = 0
 
         def job(test, count):
             try:
                 t = self.gettest(test, count)
                 done.put(t.run())
                 t.cleanup()
             except KeyboardInterrupt:
                 pass
             except: # re-raises
                 done.put(('!', test, 'run-test raised an error, see traceback'))
                 raise
 
         try:
             while tests or running:
                 if not done.empty() or running == jobs or not tests:
                     try:
                         code, test, msg = done.get(True, 1)
                         self.results[code].append((test, msg))
                         if self.options.first and code not in '.si':
                             break
                     except queue.Empty:
                         continue
                     running -= 1
                 if tests and not running == jobs:
                     test = tests.pop(0)
                     if self.options.loop:
                         tests.append(test)
                     t = threading.Thread(target=job, name=test,
                                          args=(test, count))
                     t.start()
                     running += 1
                     count += 1
         except KeyboardInterrupt:
             self.abort[0] = True
 
 def main(args, parser=None):
     runner = TestRunner()
 
     parser = parser or getparser()
     (options, args) = parseargs(args, parser)
     runner.options = options
     os.umask(022)
 
     checktools()
 
-    if not args:
-        if options.changed:
-            proc = Popen4('hg st --rev "%s" -man0 .' % options.changed,
-                          None, 0)
-            stdout, stderr = proc.communicate()
-            args = stdout.strip('\0').split('\0')
-        else:
-            args = os.listdir(".")
-
-    tests = [t for t in args
-             if os.path.basename(t).startswith("test-")
-                 and (t.endswith(".py") or t.endswith(".t"))]
+    tests = runner.findtests(args)
 
     if options.random:
         random.shuffle(tests)
     else:
         # keywords for slow tests
         slow = 'svn gendoc check-code-hg'.split()
         def sortkey(f):
             # run largest tests first, as they tend to take the longest
             try:
                 val = -os.stat(f).st_size
             except OSError, e:
                 if e.errno != errno.ENOENT:
                     raise
                 return -1e9 # file does not exist, tell early
             for kw in slow:
                 if kw in f:
                     val *= 10
             return val
         tests.sort(key=sortkey)
 
     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))
 
     runner.testdir = os.environ['TESTDIR'] = os.getcwd()
     if options.tmpdir:
         options.keep_tmpdir = True
         tmpdir = 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
 
             # Automatically removing tmpdir sounds convenient, but could
             # really annoy anyone in the habit of using "--tmpdir=/tmp"
             # or "--tmpdir=$HOME".
             #vlog("# Removing temp dir", tmpdir)
             #shutil.rmtree(tmpdir)
         os.makedirs(tmpdir)
     else:
         d = None
         if os.name == 'nt':
             # without this, we get the default temp dir location, but
             # in all lowercase, which causes troubles with paths (issue3490)
             d = os.getenv('TMP')
         tmpdir = tempfile.mkdtemp('', 'hgtests.', d)
     runner.hgtmp = os.environ['HGTMP'] = os.path.realpath(tmpdir)
 
     if options.with_hg:
         runner.inst = None
         runner.bindir = os.path.dirname(os.path.realpath(options.with_hg))
         runner.tmpbindir = os.path.join(runner.hgtmp, 'install', 'bin')
         os.makedirs(runner.tmpbindir)
 
         # This looks redundant with how Python initializes sys.path from
         # the location of the script being executed.  Needed because the
         # "hg" specified by --with-hg is not the only Python script
         # executed in the test suite that needs to import 'mercurial'
         # ... which means it's not really redundant at all.
         runner.pythondir = runner.bindir
     else:
         runner.inst = os.path.join(runner.hgtmp, "install")
         runner.bindir = os.environ["BINDIR"] = os.path.join(runner.inst,
                                                             "bin")
         runner.tmpbindir = runner.bindir
         runner.pythondir = os.path.join(runner.inst, "lib", "python")
 
     os.environ["BINDIR"] = runner.bindir
     os.environ["PYTHON"] = PYTHON
 
     path = [runner.bindir] + os.environ["PATH"].split(os.pathsep)
     if runner.tmpbindir != runner.bindir:
         path = [runner.tmpbindir] + path
     os.environ["PATH"] = os.pathsep.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 = [runner.pythondir, runner.testdir,
               os.path.abspath(os.path.dirname(__file__))]
     # 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 = os.environ.get(IMPL_PATH)
     if oldpypath:
         pypath.append(oldpypath)
     os.environ[IMPL_PATH] = os.pathsep.join(pypath)
 
     runner.coveragefile = os.path.join(runner.testdir, ".coverage")
 
     vlog("# Using TESTDIR", runner.testdir)
     vlog("# Using HGTMP", runner.hgtmp)
     vlog("# Using PATH", os.environ["PATH"])
     vlog("# Using", IMPL_PATH, os.environ[IMPL_PATH])
 
     try:
         return runner.runtests(tests) or 0
     finally:
         time.sleep(.1)
         runner.cleanup()
 
 if __name__ == '__main__':
     sys.exit(main(sys.argv[1:]))