text: #!/usr/bin/env python
  # Copyright (c) 2012 The Chromium Authors. All rights reserved.
  # Use of this source code is governed by a BSD-style license that can be
  # found in the LICENSE file.
  
  ''' Runs various chrome tests through valgrind_test.py.'''
  
  import glob
  import logging
  import multiprocessing
  import optparse
  import os
  import stat
  import subprocess
  import sys
  
  import logging_utils
  import path_utils
  
  import common
  import valgrind_test
  
  class TestNotFound(Exception): pass
  
  class MultipleGTestFiltersSpecified(Exception): pass
  
  class BuildDirNotFound(Exception): pass
  
  class BuildDirAmbiguous(Exception): pass
  
  class ExecutableNotFound(Exception): pass
  
  class BadBinary(Exception): pass
  
  class ChromeTests:
    SLOW_TOOLS = ["memcheck", "drmemory"]
    LAYOUT_TESTS_DEFAULT_CHUNK_SIZE = 300
  
    def __init__(self, options, args, test):
      if ':' in test:
        (self._test, self._gtest_filter) = test.split(':', 1)
      else:
        self._test = test
        self._gtest_filter = options.gtest_filter
  
      if self._test not in self._test_list:
        raise TestNotFound("Unknown test: %s" % test)
  
      if options.gtest_filter and options.gtest_filter != self._gtest_filter:
        raise MultipleGTestFiltersSpecified("Can not specify both --gtest_filter "
                                            "and --test %s" % test)
  
      self._options = options
      self._args = args
  
      script_dir = path_utils.ScriptDir()
      # Compute the top of the tree (the "source dir") from the script dir (where
      # this script lives).  We assume that the script dir is in tools/valgrind/
      # relative to the top of the tree.
      self._source_dir = os.path.dirname(os.path.dirname(script_dir))
      # since this path is used for string matching, make sure it's always
      # an absolute Unix-style path
      self._source_dir = os.path.abspath(self._source_dir).replace('\\', '/')
      valgrind_test_script = os.path.join(script_dir, "valgrind_test.py")
      self._command_preamble = ["--source-dir=%s" % (self._source_dir)]
  
      if not self._options.build_dir:
        dirs = [
          os.path.join(self._source_dir, "xcodebuild", "Debug"),
          os.path.join(self._source_dir, "out", "Debug"),
          os.path.join(self._source_dir, "build", "Debug"),
        ]
        build_dir = [d for d in dirs if os.path.isdir(d)]
        if len(build_dir) > 1:
          raise BuildDirAmbiguous("Found more than one suitable build dir:\n"
                                  "%s\nPlease specify just one "
                                  "using --build-dir" % ", ".join(build_dir))
        elif build_dir:
          self._options.build_dir = build_dir[0]
        else:
          self._options.build_dir = None
  
      if self._options.build_dir:
        build_dir = os.path.abspath(self._options.build_dir)
        self._command_preamble += ["--build-dir=%s" % (self._options.build_dir)]
  
    def _EnsureBuildDirFound(self):
      if not self._options.build_dir:
        raise BuildDirNotFound("Oops, couldn't find a build dir, please "
                               "specify it manually using --build-dir")
  
    def _DefaultCommand(self, tool, exe=None, valgrind_test_args=None):
      '''Generates the default command array that most tests will use.'''
      if exe and common.IsWindows():
        exe += '.exe'
  
      cmd = list(self._command_preamble)
  
      # Find all suppressions matching the following pattern:
      # tools/valgrind/TOOL/suppressions[_PLATFORM].txt
      # and list them with --suppressions= prefix.
      script_dir = path_utils.ScriptDir()
      tool_name = tool.ToolName();
      suppression_file = os.path.join(script_dir, tool_name, "suppressions.txt")
      if os.path.exists(suppression_file):
        cmd.append("--suppressions=%s" % suppression_file)
      # Platform-specific suppression
      for platform in common.PlatformNames():
        platform_suppression_file = \
            os.path.join(script_dir, tool_name, 'suppressions_%s.txt' % platform)
        if os.path.exists(platform_suppression_file):
          cmd.append("--suppressions=%s" % platform_suppression_file)
  
      if tool_name == "drmemory":
        if self._options.drmemory_ops:
          # prepending " " to avoid Dr. Memory's option confusing optparse
          cmd += ["--drmemory_ops", " " + self._options.drmemory_ops]
  
      if self._options.valgrind_tool_flags:
        cmd += self._options.valgrind_tool_flags.split(" ")
      if self._options.keep_logs:
        cmd += ["--keep_logs"]
      if valgrind_test_args != None:
        for arg in valgrind_test_args:
          cmd.append(arg)
      if exe:
        self._EnsureBuildDirFound()
        exe_path = os.path.join(self._options.build_dir, exe)
        if not os.path.exists(exe_path):
          raise ExecutableNotFound("Couldn't find '%s'" % exe_path)
  
        # Make sure we don't try to test ASan-built binaries
        # with other dynamic instrumentation-based tools.
        # TODO(timurrrr): also check TSan and MSan?
        # `nm` might not be available, so use try-except.
        try:
          # Do not perform this check on OS X, as 'nm' on 10.6 can't handle
          # binaries built with Clang 3.5+.
          if not common.IsMac():
            nm_output = subprocess.check_output(["nm", exe_path])
            if nm_output.find("__asan_init") != -1:
              raise BadBinary("You're trying to run an executable instrumented "
                              "with AddressSanitizer under %s. Please provide "
                              "an uninstrumented executable." % tool_name)
        except OSError:
          pass
  
        cmd.append(exe_path)
        # Valgrind runs tests slowly, so slow tests hurt more; show elapased time
        # so we can find the slowpokes.
        cmd.append("--gtest_print_time")
        # Built-in test launcher for gtest-based executables runs tests using
        # multiple process by default. Force the single-process mode back.
        cmd.append("--single-process-tests")
      if self._options.gtest_repeat:
        cmd.append("--gtest_repeat=%s" % self._options.gtest_repeat)
      if self._options.gtest_shuffle:
        cmd.append("--gtest_shuffle")
      if self._options.gtest_break_on_failure:
        cmd.append("--gtest_break_on_failure")
      if self._options.test_launcher_bot_mode:
        cmd.append("--test-launcher-bot-mode")
      if self._options.test_launcher_total_shards is not None:
        cmd.append("--test-launcher-total-shards=%d" % self._options.test_launcher_total_shards)
      if self._options.test_launcher_shard_index is not None:
        cmd.append("--test-launcher-shard-index=%d" % self._options.test_launcher_shard_index)
      return cmd
  
    def Run(self):
      ''' Runs the test specified by command-line argument --test '''
      logging.info("running test %s" % (self._test))
      return self._test_list[self._test](self)
  
    def _AppendGtestFilter(self, tool, name, cmd):
      '''Append an appropriate --gtest_filter flag to the googletest binary
         invocation.
         If the user passed his own filter mentioning only one test, just use it.
         Othewise, filter out tests listed in the appropriate gtest_exclude files.
      '''
      if (self._gtest_filter and
          ":" not in self._gtest_filter and
          "?" not in self._gtest_filter and
          "*" not in self._gtest_filter):
        cmd.append("--gtest_filter=%s" % self._gtest_filter)
        return
  
      filters = []
      gtest_files_dir = os.path.join(path_utils.ScriptDir(), "gtest_exclude")
  
      gtest_filter_files = [
          os.path.join(gtest_files_dir, name + ".gtest-%s.txt" % tool.ToolName())]
      # Use ".gtest.txt" files only for slow tools, as they now contain
      # Valgrind- and Dr.Memory-specific filters.
      # TODO(glider): rename the files to ".gtest_slow.txt"
      if tool.ToolName() in ChromeTests.SLOW_TOOLS:
        gtest_filter_files += [os.path.join(gtest_files_dir, name + ".gtest.txt")]
      for platform_suffix in common.PlatformNames():
        gtest_filter_files += [
          os.path.join(gtest_files_dir, name + ".gtest_%s.txt" % platform_suffix),
          os.path.join(gtest_files_dir, name + ".gtest-%s_%s.txt" % \
              (tool.ToolName(), platform_suffix))]
      logging.info("Reading gtest exclude filter files:")
      for filename in gtest_filter_files:
        # strip the leading absolute path (may be very long on the bot)
        # and the following / or \.
        readable_filename = filename.replace("\\", "/")  # '\' on Windows
        readable_filename = readable_filename.replace(self._source_dir, "")[1:]
        if not os.path.exists(filename):
          logging.info("  \"%s\" - not found" % readable_filename)
          continue
        logging.info("  \"%s\" - OK" % readable_filename)
        f = open(filename, 'r')
        for line in f.readlines():
          if line.startswith("#") or line.startswith("//") or line.isspace():
            continue
          line = line.rstrip()
          test_prefixes = ["FLAKY", "FAILS"]
          for p in test_prefixes:
            # Strip prefixes from the test names.
            line = line.replace(".%s_" % p, ".")
          # Exclude the original test name.
          filters.append(line)
          if line[-2:] != ".*":
            # List all possible prefixes if line doesn't end with ".*".
            for p in test_prefixes:
              filters.append(line.replace(".", ".%s_" % p))
      # Get rid of duplicates.
      filters = set(filters)
      gtest_filter = self._gtest_filter
      if len(filters):
        if gtest_filter:
          gtest_filter += ":"
          if gtest_filter.find("-") < 0:
            gtest_filter += "-"
        else:
          gtest_filter = "-"
        gtest_filter += ":".join(filters)
      if gtest_filter:
        cmd.append("--gtest_filter=%s" % gtest_filter)
  
    @staticmethod
    def ShowTests():
      test_to_names = {}
      for name, test_function in ChromeTests._test_list.iteritems():
        test_to_names.setdefault(test_function, []).append(name)
  
      name_to_aliases = {}
      for names in test_to_names.itervalues():
        names.sort(key=lambda name: len(name))
        name_to_aliases[names[0]] = names[1:]
  
      print
      print "Available tests:"
      print "----------------"
      for name, aliases in sorted(name_to_aliases.iteritems()):
        if aliases:
          print "   {} (aka {})".format(name, ', '.join(aliases))
        else:
          print "   {}".format(name)
  
    def SetupLdPath(self, requires_build_dir):
      if requires_build_dir:
        self._EnsureBuildDirFound()
      elif not self._options.build_dir:
        return
  
      # Append build_dir to LD_LIBRARY_PATH so external libraries can be loaded.
      if (os.getenv("LD_LIBRARY_PATH")):
        os.putenv("LD_LIBRARY_PATH", "%s:%s" % (os.getenv("LD_LIBRARY_PATH"),
                                                self._options.build_dir))
      else:
        os.putenv("LD_LIBRARY_PATH", self._options.build_dir)
  
    def SimpleTest(self, module, name, valgrind_test_args=None, cmd_args=None):
      tool = valgrind_test.CreateTool(self._options.valgrind_tool)
      cmd = self._DefaultCommand(tool, name, valgrind_test_args)
      self._AppendGtestFilter(tool, name, cmd)
      cmd.extend(['--test-tiny-timeout=1000'])
      if cmd_args:
        cmd.extend(cmd_args)
  
      self.SetupLdPath(True)
      return tool.Run(cmd, module)
  
    def RunCmdLine(self):
      tool = valgrind_test.CreateTool(self._options.valgrind_tool)
      cmd = self._DefaultCommand(tool, None, self._args)
      self.SetupLdPath(False)
      return tool.Run(cmd, None)
  
    def TestAccessibility(self):
      return self.SimpleTest("accessibility", "accessibility_unittests")
  
    def TestAddressInput(self):
      return self.SimpleTest("addressinput", "libaddressinput_unittests")
  
    def TestAngle(self):
      return self.SimpleTest("angle", "angle_unittests")
  
    def TestAppList(self):
      return self.SimpleTest("app_list", "app_list_unittests")
  
    def TestAsh(self):
      return self.SimpleTest("ash", "ash_unittests")
  
    def TestAura(self):
      return self.SimpleTest("aura", "aura_unittests")
  
    def TestBase(self):
      return self.SimpleTest("base", "base_unittests")
  
    def TestBlinkHeap(self):
      return self.SimpleTest("blink_heap", "blink_heap_unittests")
  
    def TestBlinkPlatform(self):
      return self.SimpleTest("blink_platform", "blink_platform_unittests")
  
    def TestCacheInvalidation(self):
      return self.SimpleTest("cacheinvalidation", "cacheinvalidation_unittests")
  
    def TestCast(self):
      return self.SimpleTest("chrome", "cast_unittests")
  
    def TestCC(self):
      return self.SimpleTest("cc", "cc_unittests",
                             cmd_args=[
                                 "--cc-layer-tree-test-long-timeout"])
  
    def TestChromeApp(self):
      return self.SimpleTest("chrome_app", "chrome_app_unittests")
  
    def TestChromeElf(self):
      return self.SimpleTest("chrome_elf", "chrome_elf_unittests")
  
    def TestChromeDriver(self):
      return self.SimpleTest("chromedriver", "chromedriver_unittests")
  
    def TestChromeOS(self):
      return self.SimpleTest("chromeos", "chromeos_unittests")
  
    def TestComponents(self):
      return self.SimpleTest("components", "components_unittests")
  
    def TestCompositor(self):
      return self.SimpleTest("compositor", "compositor_unittests")
  
    def TestContent(self):
      return self.SimpleTest("content", "content_unittests")
  
    def TestCourgette(self):
      return self.SimpleTest("courgette", "courgette_unittests")
  
    def TestCrypto(self):
      return self.SimpleTest("crypto", "crypto_unittests")
  
    def TestDevice(self):
      return self.SimpleTest("device", "device_unittests")
  
    def TestDisplay(self):
      return self.SimpleTest("display", "display_unittests")
  
    def TestEvents(self):
      return self.SimpleTest("events", "events_unittests")
  
    def TestExtensions(self):
      return self.SimpleTest("extensions", "extensions_unittests")
  
    def TestFFmpegRegressions(self):
      return self.SimpleTest("chrome", "ffmpeg_regression_tests")
  
    def TestGCM(self):
      return self.SimpleTest("gcm", "gcm_unit_tests")
  
    def TestGfx(self):
      return self.SimpleTest("gfx", "gfx_unittests")
  
    def TestGin(self):
      return self.SimpleTest("gin", "gin_unittests")
  
    def TestGoogleApis(self):
      return self.SimpleTest("google_apis", "google_apis_unittests")
  
    def TestGPU(self):
      return self.SimpleTest("gpu", "gpu_unittests")
  
    def TestIpc(self):
      return self.SimpleTest("ipc", "ipc_tests",
                             valgrind_test_args=["--trace_children"])
  
    def TestInstallerUtil(self):
      return self.SimpleTest("installer_util", "installer_util_unittests")
  
    def TestJingle(self):
      return self.SimpleTest("chrome", "jingle_unittests")
  
    def TestKeyboard(self):
      return self.SimpleTest("keyboard", "keyboard_unittests")
  
    def TestMedia(self):
      return self.SimpleTest("chrome", "media_unittests")
  
    def TestMessageCenter(self):
      return self.SimpleTest("message_center", "message_center_unittests")
  
    def TestMidi(self):
      return self.SimpleTest("chrome", "midi_unittests")
  
    def TestMojoCommon(self):
      return self.SimpleTest("mojo_common", "mojo_common_unittests")
  
    def TestMojoPublicBindings(self):
      return self.SimpleTest("mojo_public_bindings",
                             "mojo_public_bindings_unittests")
  
    def TestMojoPublicSystem(self):
      return self.SimpleTest("mojo_public_system",
                             "mojo_public_system_unittests")
  
    def TestMojoPublicSysPerf(self):
      return self.SimpleTest("mojo_public_sysperf",
                             "mojo_public_system_perftests")
  
    def TestMojoSystem(self):
      return self.SimpleTest("mojo_system", "mojo_system_unittests")
  
    def TestNet(self):
      return self.SimpleTest("net", "net_unittests")
  
    def TestNetPerf(self):
      return self.SimpleTest("net", "net_perftests")
  
    def TestPhoneNumber(self):
      return self.SimpleTest("phonenumber", "libphonenumber_unittests")
  
    def TestPPAPI(self):
      return self.SimpleTest("chrome", "ppapi_unittests")
  
    def TestPrinting(self):
      return self.SimpleTest("chrome", "printing_unittests")
  
    def TestRemoting(self):
      return self.SimpleTest("chrome", "remoting_unittests",
                             cmd_args=[
                                 "--ui-test-action-timeout=60000",
                                 "--ui-test-action-max-timeout=150000"])
  
    def TestSkia(self):
      return self.SimpleTest("skia", "skia_unittests")
  
    def TestSql(self):
      return self.SimpleTest("chrome", "sql_unittests")
  
    def TestSync(self):
      return self.SimpleTest("chrome", "sync_unit_tests")
  
    def TestLinuxSandbox(self):
      return self.SimpleTest("sandbox", "sandbox_linux_unittests")
  
    def TestUnit(self):
      # http://crbug.com/51716
      # Disabling all unit tests
      # Problems reappeared after r119922
      if common.IsMac() and (self._options.valgrind_tool == "memcheck"):
        logging.warning("unit_tests are disabled for memcheck on MacOS.")
        return 0;
      return self.SimpleTest("chrome", "unit_tests")
  
    def TestUIBaseUnit(self):
      return self.SimpleTest("chrome", "ui_base_unittests")
  
    def TestUIChromeOS(self):
      return self.SimpleTest("chrome", "ui_chromeos_unittests")
  
    def TestURL(self):
      return self.SimpleTest("chrome", "url_unittests")
  
    def TestViews(self):
      return self.SimpleTest("views", "views_unittests")
  
  
    # Valgrind timeouts are in seconds.
    UI_VALGRIND_ARGS = ["--timeout=14400", "--trace_children", "--indirect"]
    # UI test timeouts are in milliseconds.
    UI_TEST_ARGS = ["--ui-test-action-timeout=60000",
                    "--ui-test-action-max-timeout=150000",
                    "--no-sandbox"]
  
    # TODO(thestig) fine-tune these values.
    # Valgrind timeouts are in seconds.
    BROWSER_VALGRIND_ARGS = ["--timeout=50000", "--trace_children", "--indirect"]
    # Browser test timeouts are in milliseconds.
    BROWSER_TEST_ARGS = ["--ui-test-action-timeout=400000",
                         "--ui-test-action-max-timeout=800000",
                         "--no-sandbox"]
  
    def TestBrowser(self):
      return self.SimpleTest("chrome", "browser_tests",
                             valgrind_test_args=self.BROWSER_VALGRIND_ARGS,
                             cmd_args=self.BROWSER_TEST_ARGS)
  
    def TestContentBrowser(self):
      return self.SimpleTest("content", "content_browsertests",
                             valgrind_test_args=self.BROWSER_VALGRIND_ARGS,
                             cmd_args=self.BROWSER_TEST_ARGS)
  
    def TestInteractiveUI(self):
      return self.SimpleTest("chrome", "interactive_ui_tests",
                             valgrind_test_args=self.UI_VALGRIND_ARGS,
                             cmd_args=self.UI_TEST_ARGS)
  
    def TestSyncIntegration(self):
      return self.SimpleTest("chrome", "sync_integration_tests",
                             valgrind_test_args=self.UI_VALGRIND_ARGS,
                             cmd_args=(["--ui-test-action-max-timeout=450000"]))
  
    def TestLayoutChunk(self, chunk_num, chunk_size):
      # Run tests [chunk_num*chunk_size .. (chunk_num+1)*chunk_size) from the
      # list of tests.  Wrap around to beginning of list at end.
      # If chunk_size is zero, run all tests in the list once.
      # If a text file is given as argument, it is used as the list of tests.
      assert((chunk_size == 0) != (len(self._args) == 0))
      # Build the ginormous commandline in 'cmd'.
      # It's going to be roughly
      #  python valgrind_test.py ...
      # but we'll use the --indirect flag to valgrind_test.py
      # to avoid valgrinding python.
      # Start by building the valgrind_test.py commandline.
      tool = valgrind_test.CreateTool(self._options.valgrind_tool)
      cmd = self._DefaultCommand(tool)
      cmd.append("--trace_children")
      cmd.append("--indirect_webkit_layout")
      cmd.append("--ignore_exit_code")
      # Now build script_cmd, the run-webkits-tests commandline.
      # Store each chunk in its own directory so that we can find the data later
      chunk_dir = os.path.join("layout", "chunk_%05d" % chunk_num)
      out_dir = os.path.join(path_utils.ScriptDir(), "latest")
      out_dir = os.path.join(out_dir, chunk_dir)
      if os.path.exists(out_dir):
        old_files = glob.glob(os.path.join(out_dir, "*.txt"))
        for f in old_files:
          os.remove(f)
      else:
        os.makedirs(out_dir)
      script = os.path.join(self._source_dir, "third_party", "WebKit", "Tools",
                            "Scripts", "run-webkit-tests")
      # http://crbug.com/260627: After the switch to content_shell from DRT, each
      # test now brings up 3 processes.  Under Valgrind, they become memory bound
      # and can eventually OOM if we don't reduce the total count.
      # It'd be nice if content_shell automatically throttled the startup of new
      # tests if we're low on memory.
      jobs = max(1, int(multiprocessing.cpu_count() * 0.3))
      script_cmd = ["python", script, "-v",
                    # run a separate DumpRenderTree for each test
                    "--batch-size=1",
                    "--fully-parallel",
                    "--child-processes=%d" % jobs,
                    "--time-out-ms=800000",
                    "--no-retry-failures",  # retrying takes too much time
                    # http://crbug.com/176908: Don't launch a browser when done.
                    "--no-show-results",
                    "--nocheck-sys-deps",
                    "--additional-driver-flag=--no-sandbox"]
      # Pass build mode to run-webkit-tests.  We aren't passed it directly,
      # so parse it out of build_dir.  run-webkit-tests can only handle
      # the two values "Release" and "Debug".
      # TODO(Hercules): unify how all our scripts pass around build mode
      # (--mode / --target / --build-dir / --debug)
      if self._options.build_dir:
        build_root, mode = os.path.split(self._options.build_dir)
        script_cmd.extend(["--build-directory", build_root, "--target", mode])
      if (chunk_size > 0):
        script_cmd.append("--run-chunk=%d:%d" % (chunk_num, chunk_size))
      if len(self._args):
        # if the arg is a txt file, then treat it as a list of tests
        if os.path.isfile(self._args[0]) and self._args[0][-4:] == ".txt":
          script_cmd.append("--test-list=%s" % self._args[0])
        else:
          script_cmd.extend(self._args)
      self._AppendGtestFilter(tool, "layout", script_cmd)
      # Now run script_cmd with the wrapper in cmd
      cmd.extend(["--"])
      cmd.extend(script_cmd)
  
      # Layout tests often times fail quickly, but the buildbot remains green.
      # Detect this situation when running with the default chunk size.
      if chunk_size == self.LAYOUT_TESTS_DEFAULT_CHUNK_SIZE:
        min_runtime_in_seconds=120
      else:
        min_runtime_in_seconds=0
      ret = tool.Run(cmd, "layout", min_runtime_in_seconds=min_runtime_in_seconds)
      return ret
  
  
    def TestLayout(self):
      # A "chunk file" is maintained in the local directory so that each test
      # runs a slice of the layout tests of size chunk_size that increments with
      # each run.  Since tests can be added and removed from the layout tests at
      # any time, this is not going to give exact coverage, but it will allow us
      # to continuously run small slices of the layout tests under valgrind rather
      # than having to run all of them in one shot.
      chunk_size = self._options.num_tests
      if chunk_size == 0 or len(self._args):
        return self.TestLayoutChunk(0, 0)
      chunk_num = 0
      chunk_file = os.path.join("valgrind_layout_chunk.txt")
      logging.info("Reading state from " + chunk_file)
      try:
        f = open(chunk_file)
        if f:
          chunk_str = f.read()
          if len(chunk_str):
            chunk_num = int(chunk_str)
          # This should be enough so that we have a couple of complete runs
          # of test data stored in the archive (although note that when we loop
          # that we almost guaranteed won't be at the end of the test list)
          if chunk_num > 10000:
            chunk_num = 0
          f.close()
      except IOError, (errno, strerror):
        logging.error("error reading from file %s (%d, %s)" % (chunk_file,
                      errno, strerror))
      # Save the new chunk size before running the tests. Otherwise if a
      # particular chunk hangs the bot, the chunk number will never get
      # incremented and the bot will be wedged.
      logging.info("Saving state to " + chunk_file)
      try:
        f = open(chunk_file, "w")
        chunk_num += 1
        f.write("%d" % chunk_num)
        f.close()
      except IOError, (errno, strerror):
        logging.error("error writing to file %s (%d, %s)" % (chunk_file, errno,
                      strerror))
      # Since we're running small chunks of the layout tests, it's important to
      # mark the ones that have errors in them.  These won't be visible in the
      # summary list for long, but will be useful for someone reviewing this bot.
      return self.TestLayoutChunk(chunk_num, chunk_size)
  
    # The known list of tests.
    # Recognise the original abbreviations as well as full executable names.
    _test_list = {
      "cmdline" : RunCmdLine,
      "addressinput": TestAddressInput,
      "libaddressinput_unittests": TestAddressInput,
      "accessibility": TestAccessibility,
      "angle": TestAngle,          "angle_unittests": TestAngle,
      "app_list": TestAppList,     "app_list_unittests": TestAppList,
      "ash": TestAsh,              "ash_unittests": TestAsh,
      "aura": TestAura,            "aura_unittests": TestAura,
      "base": TestBase,            "base_unittests": TestBase,
      "blink_heap": TestBlinkHeap,
      "blink_platform": TestBlinkPlatform,
      "browser": TestBrowser,      "browser_tests": TestBrowser,
      "cacheinvalidation": TestCacheInvalidation,
      "cacheinvalidation_unittests": TestCacheInvalidation,
      "cast": TestCast,            "cast_unittests": TestCast,
      "cc": TestCC,                "cc_unittests": TestCC,
      "chrome_app": TestChromeApp,
      "chrome_elf": TestChromeElf,
      "chromedriver": TestChromeDriver,
      "chromeos": TestChromeOS,    "chromeos_unittests": TestChromeOS,
      "components": TestComponents,"components_unittests": TestComponents,
      "compositor": TestCompositor,"compositor_unittests": TestCompositor,
      "content": TestContent,      "content_unittests": TestContent,
      "content_browsertests": TestContentBrowser,
      "courgette": TestCourgette,  "courgette_unittests": TestCourgette,
      "crypto": TestCrypto,        "crypto_unittests": TestCrypto,
      "device": TestDevice,        "device_unittests": TestDevice,
      "display": TestDisplay,      "display_unittests": TestDisplay,
      "events": TestEvents,        "events_unittests": TestEvents,
      "extensions": TestExtensions, "extensions_unittests": TestExtensions,
      "ffmpeg_regression_tests": TestFFmpegRegressions,
      "gcm": TestGCM,              "gcm_unit_tests": TestGCM,
      "gin": TestGin,              "gin_unittests": TestGin,
      "gfx": TestGfx,              "gfx_unittests": TestGfx,
      "google_apis": TestGoogleApis,
      "gpu": TestGPU,              "gpu_unittests": TestGPU,
      "ipc": TestIpc,              "ipc_tests": TestIpc,
      "installer_util": TestInstallerUtil,
      "installer_util_unittests": TestInstallerUtil,
      "interactive_ui": TestInteractiveUI,
      "jingle": TestJingle,        "jingle_unittests": TestJingle,
      "keyboard": TestKeyboard,    "keyboard_unittests": TestKeyboard,
      "layout": TestLayout,        "layout_tests": TestLayout,
      "media": TestMedia,          "media_unittests": TestMedia,
      "message_center": TestMessageCenter,
      "message_center_unittests" : TestMessageCenter,
      "midi": TestMidi,             "midi_unittests": TestMidi,
      "mojo_common": TestMojoCommon,
      "mojo_common_unittests": TestMojoCommon,
      "mojo_system": TestMojoSystem,
      "mojo_system_unittests": TestMojoSystem,
      "mojo_public_system": TestMojoPublicSystem,
      "mojo_public_system_unittests": TestMojoPublicSystem,
      "mojo_public_bindings": TestMojoPublicBindings,
      "mojo_public_bindings_unittests": TestMojoPublicBindings,
      "mojo_public_sysperf": TestMojoPublicSysPerf,
      "net": TestNet,              "net_unittests": TestNet,
      "net_perf": TestNetPerf,     "net_perftests": TestNetPerf,
      "phonenumber": TestPhoneNumber,
      "libphonenumber_unittests": TestPhoneNumber,
      "ppapi": TestPPAPI,          "ppapi_unittests": TestPPAPI,
      "printing": TestPrinting,    "printing_unittests": TestPrinting,
      "remoting": TestRemoting,    "remoting_unittests": TestRemoting,
      "sandbox": TestLinuxSandbox, "sandbox_linux_unittests": TestLinuxSandbox,
      "skia": TestSkia,            "skia_unittests": TestSkia,
      "sql": TestSql,              "sql_unittests": TestSql,
      "sync": TestSync,            "sync_unit_tests": TestSync,
      "sync_integration_tests": TestSyncIntegration,
      "sync_integration": TestSyncIntegration,
      "ui_base_unit": TestUIBaseUnit,       "ui_base_unittests": TestUIBaseUnit,
      "ui_chromeos": TestUIChromeOS, "ui_chromeos_unittests": TestUIChromeOS,
      "unit": TestUnit,            "unit_tests": TestUnit,
      "url": TestURL,              "url_unittests": TestURL,
      "views": TestViews,          "views_unittests": TestViews,
      "webkit": TestLayout,
    }
  
  
  def _main():
    parser = optparse.OptionParser("usage: %prog -b <dir> -t <test> "
                                   "[-t <test> ...]")
  
    parser.add_option("--help-tests", dest="help_tests", action="store_true",
                      default=False, help="List all available tests")
    parser.add_option("-b", "--build-dir",
                      help="the location of the compiler output")
    parser.add_option("--target", help="Debug or Release")
    parser.add_option("-t", "--test", action="append", default=[],
                      help="which test to run, supports test:gtest_filter format "
                           "as well.")
    parser.add_option("--baseline", action="store_true", default=False,
                      help="generate baseline data instead of validating")
    parser.add_option("--gtest_filter",
                      help="additional arguments to --gtest_filter")
    parser.add_option("--gtest_repeat", help="argument for --gtest_repeat")
    parser.add_option("--gtest_shuffle", action="store_true", default=False,
                      help="Randomize tests' orders on every iteration.")
    parser.add_option("--gtest_break_on_failure", action="store_true",
                      default=False,
                      help="Drop in to debugger on assertion failure. Also "
                           "useful for forcing tests to exit with a stack dump "
                           "on the first assertion failure when running with "
                           "--gtest_repeat=-1")
    parser.add_option("-v", "--verbose", action="store_true", default=False,
                      help="verbose output - enable debug log messages")
    parser.add_option("--tool", dest="valgrind_tool", default="memcheck",
                      help="specify a valgrind tool to run the tests under")
    parser.add_option("--tool_flags", dest="valgrind_tool_flags", default="",
                      help="specify custom flags for the selected valgrind tool")
    parser.add_option("--keep_logs", action="store_true", default=False,
                      help="store memory tool logs in the <tool>.logs directory "
                           "instead of /tmp.\nThis can be useful for tool "
                           "developers/maintainers.\nPlease note that the <tool>"
                           ".logs directory will be clobbered on tool startup.")
    parser.add_option("-n", "--num_tests", type="int",
                      default=ChromeTests.LAYOUT_TESTS_DEFAULT_CHUNK_SIZE,
                      help="for layout tests: # of subtests per run.  0 for all.")
    parser.add_option("--test-launcher-bot-mode", action="store_true",
                      help="run the tests with --test-launcher-bot-mode")
    parser.add_option("--test-launcher-total-shards", type=int,
                      help="run the tests with --test-launcher-total-shards")
    parser.add_option("--test-launcher-shard-index", type=int,
                      help="run the tests with --test-launcher-shard-index")
    parser.add_option("--drmemory_ops",
                      help="extra options passed to Dr. Memory")
  
    options, args = parser.parse_args()
  
    # Bake target into build_dir.
    if options.target and options.build_dir:
      assert (options.target !=
              os.path.basename(os.path.dirname(options.build_dir)))
      options.build_dir = os.path.join(os.path.abspath(options.build_dir),
                                       options.target)
  
    if options.verbose:
      logging_utils.config_root(logging.DEBUG)
    else:
      logging_utils.config_root()
  
    if options.help_tests:
      ChromeTests.ShowTests()
      return 0
  
    if not options.test:
      parser.error("--test not specified")
  
    if len(options.test) != 1 and options.gtest_filter:
      parser.error("--gtest_filter and multiple tests don't make sense together")
  
    for t in options.test:
      tests = ChromeTests(options, args, t)
      ret = tests.Run()
      if ret: return ret
    return 0
  
  
  if __name__ == "__main__":
    sys.exit(_main())
  