From 6bf0a5cb5034a7e684dcc3500e841785237ce2dd Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 19:32:43 +0200
Subject: Adding upstream version 1:115.7.0.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 testing/mozbase/mozlog/mozlog/__init__.py          |   34 +
 testing/mozbase/mozlog/mozlog/capture.py           |   96 ++
 testing/mozbase/mozlog/mozlog/commandline.py       |  344 ++++++
 .../mozbase/mozlog/mozlog/formatters/__init__.py   |   32 +
 testing/mozbase/mozlog/mozlog/formatters/base.py   |   25 +
 .../mozlog/mozlog/formatters/errorsummary.py       |  163 +++
 .../mozbase/mozlog/mozlog/formatters/grouping.py   |  391 +++++++
 .../mozlog/mozlog/formatters/html/__init__.py      |    7 +
 .../mozbase/mozlog/mozlog/formatters/html/html.py  |  343 ++++++
 .../mozbase/mozlog/mozlog/formatters/html/main.js  |  166 +++
 .../mozlog/mozlog/formatters/html/style.css        |  155 +++
 .../mozlog/mozlog/formatters/html/xmlgen.py        |  312 ++++++
 .../mozlog/mozlog/formatters/machformatter.py      |  651 ++++++++++++
 .../mozbase/mozlog/mozlog/formatters/process.py    |   60 ++
 .../mozlog/mozlog/formatters/tbplformatter.py      |  446 ++++++++
 .../mozbase/mozlog/mozlog/formatters/unittest.py   |   83 ++
 testing/mozbase/mozlog/mozlog/formatters/xunit.py  |  115 ++
 testing/mozbase/mozlog/mozlog/handlers/__init__.py |   19 +
 testing/mozbase/mozlog/mozlog/handlers/base.py     |  124 +++
 .../mozlog/mozlog/handlers/bufferhandler.py        |   86 ++
 .../mozlog/mozlog/handlers/messagehandler.py       |   39 +
 .../mozlog/mozlog/handlers/statushandler.py        |   87 ++
 .../mozlog/mozlog/handlers/summaryhandler.py       |  193 ++++
 .../mozlog/mozlog/handlers/valgrindhandler.py      |  138 +++
 testing/mozbase/mozlog/mozlog/logtypes.py          |  302 ++++++
 testing/mozbase/mozlog/mozlog/proxy.py             |   81 ++
 .../mozlog/mozlog/pytest_mozlog/__init__.py        |    0
 .../mozbase/mozlog/mozlog/pytest_mozlog/plugin.py  |  127 +++
 testing/mozbase/mozlog/mozlog/reader.py            |   78 ++
 testing/mozbase/mozlog/mozlog/scripts/__init__.py  |   41 +
 testing/mozbase/mozlog/mozlog/scripts/format.py    |   55 +
 testing/mozbase/mozlog/mozlog/scripts/logmerge.py  |   90 ++
 testing/mozbase/mozlog/mozlog/scripts/unstable.py  |  148 +++
 testing/mozbase/mozlog/mozlog/stdadapter.py        |   50 +
 testing/mozbase/mozlog/mozlog/structuredlog.py     |  769 ++++++++++++++
 .../mozbase/mozlog/mozlog/unstructured/__init__.py |    8 +
 .../mozbase/mozlog/mozlog/unstructured/logger.py   |  191 ++++
 .../mozlog/mozlog/unstructured/loggingmixin.py     |   42 +
 .../mozlog/mozlog/unstructured/loglistener.py      |   50 +
 testing/mozbase/mozlog/setup.cfg                   |    2 +
 testing/mozbase/mozlog/setup.py                    |   43 +
 testing/mozbase/mozlog/tests/conftest.py           |   24 +
 testing/mozbase/mozlog/tests/manifest.ini          |    9 +
 testing/mozbase/mozlog/tests/test_capture.py       |   37 +
 testing/mozbase/mozlog/tests/test_errorsummary.py  |  125 +++
 testing/mozbase/mozlog/tests/test_formatters.py    |  767 ++++++++++++++
 testing/mozbase/mozlog/tests/test_logger.py        |  303 ++++++
 testing/mozbase/mozlog/tests/test_logtypes.py      |  106 ++
 testing/mozbase/mozlog/tests/test_structured.py    | 1098 ++++++++++++++++++++
 .../mozbase/mozlog/tests/test_terminal_colors.py   |   62 ++
 50 files changed, 8717 insertions(+)
 create mode 100644 testing/mozbase/mozlog/mozlog/__init__.py
 create mode 100644 testing/mozbase/mozlog/mozlog/capture.py
 create mode 100644 testing/mozbase/mozlog/mozlog/commandline.py
 create mode 100644 testing/mozbase/mozlog/mozlog/formatters/__init__.py
 create mode 100644 testing/mozbase/mozlog/mozlog/formatters/base.py
 create mode 100644 testing/mozbase/mozlog/mozlog/formatters/errorsummary.py
 create mode 100644 testing/mozbase/mozlog/mozlog/formatters/grouping.py
 create mode 100644 testing/mozbase/mozlog/mozlog/formatters/html/__init__.py
 create mode 100755 testing/mozbase/mozlog/mozlog/formatters/html/html.py
 create mode 100644 testing/mozbase/mozlog/mozlog/formatters/html/main.js
 create mode 100644 testing/mozbase/mozlog/mozlog/formatters/html/style.css
 create mode 100644 testing/mozbase/mozlog/mozlog/formatters/html/xmlgen.py
 create mode 100644 testing/mozbase/mozlog/mozlog/formatters/machformatter.py
 create mode 100644 testing/mozbase/mozlog/mozlog/formatters/process.py
 create mode 100644 testing/mozbase/mozlog/mozlog/formatters/tbplformatter.py
 create mode 100755 testing/mozbase/mozlog/mozlog/formatters/unittest.py
 create mode 100644 testing/mozbase/mozlog/mozlog/formatters/xunit.py
 create mode 100644 testing/mozbase/mozlog/mozlog/handlers/__init__.py
 create mode 100644 testing/mozbase/mozlog/mozlog/handlers/base.py
 create mode 100644 testing/mozbase/mozlog/mozlog/handlers/bufferhandler.py
 create mode 100644 testing/mozbase/mozlog/mozlog/handlers/messagehandler.py
 create mode 100644 testing/mozbase/mozlog/mozlog/handlers/statushandler.py
 create mode 100644 testing/mozbase/mozlog/mozlog/handlers/summaryhandler.py
 create mode 100644 testing/mozbase/mozlog/mozlog/handlers/valgrindhandler.py
 create mode 100644 testing/mozbase/mozlog/mozlog/logtypes.py
 create mode 100644 testing/mozbase/mozlog/mozlog/proxy.py
 create mode 100644 testing/mozbase/mozlog/mozlog/pytest_mozlog/__init__.py
 create mode 100644 testing/mozbase/mozlog/mozlog/pytest_mozlog/plugin.py
 create mode 100644 testing/mozbase/mozlog/mozlog/reader.py
 create mode 100644 testing/mozbase/mozlog/mozlog/scripts/__init__.py
 create mode 100644 testing/mozbase/mozlog/mozlog/scripts/format.py
 create mode 100644 testing/mozbase/mozlog/mozlog/scripts/logmerge.py
 create mode 100644 testing/mozbase/mozlog/mozlog/scripts/unstable.py
 create mode 100644 testing/mozbase/mozlog/mozlog/stdadapter.py
 create mode 100644 testing/mozbase/mozlog/mozlog/structuredlog.py
 create mode 100644 testing/mozbase/mozlog/mozlog/unstructured/__init__.py
 create mode 100644 testing/mozbase/mozlog/mozlog/unstructured/logger.py
 create mode 100644 testing/mozbase/mozlog/mozlog/unstructured/loggingmixin.py
 create mode 100644 testing/mozbase/mozlog/mozlog/unstructured/loglistener.py
 create mode 100644 testing/mozbase/mozlog/setup.cfg
 create mode 100644 testing/mozbase/mozlog/setup.py
 create mode 100644 testing/mozbase/mozlog/tests/conftest.py
 create mode 100644 testing/mozbase/mozlog/tests/manifest.ini
 create mode 100644 testing/mozbase/mozlog/tests/test_capture.py
 create mode 100644 testing/mozbase/mozlog/tests/test_errorsummary.py
 create mode 100644 testing/mozbase/mozlog/tests/test_formatters.py
 create mode 100644 testing/mozbase/mozlog/tests/test_logger.py
 create mode 100644 testing/mozbase/mozlog/tests/test_logtypes.py
 create mode 100644 testing/mozbase/mozlog/tests/test_structured.py
 create mode 100644 testing/mozbase/mozlog/tests/test_terminal_colors.py

(limited to 'testing/mozbase/mozlog')

diff --git a/testing/mozbase/mozlog/mozlog/__init__.py b/testing/mozbase/mozlog/mozlog/__init__.py
new file mode 100644
index 0000000000..82d40b5c55
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/__init__.py
@@ -0,0 +1,34 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+"""
+Mozlog aims to standardize log handling and formatting within Mozilla.
+
+It implements a JSON-based structured logging protocol with convenience
+facilities for recording test results.
+
+The old unstructured module is deprecated. It simply wraps Python's
+logging_ module and adds a few convenience methods for logging test
+results and events.
+"""
+
+import sys
+
+from . import commandline, structuredlog, unstructured
+from .proxy import get_proxy_logger
+from .structuredlog import get_default_logger, set_default_logger
+
+# Backwards compatibility shim for consumers that use mozlog.structured
+structured = sys.modules[__name__]
+sys.modules["{}.structured".format(__name__)] = structured
+
+__all__ = [
+    "commandline",
+    "structuredlog",
+    "unstructured",
+    "get_default_logger",
+    "set_default_logger",
+    "get_proxy_logger",
+    "structured",
+]
diff --git a/testing/mozbase/mozlog/mozlog/capture.py b/testing/mozbase/mozlog/mozlog/capture.py
new file mode 100644
index 0000000000..75717d62c8
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/capture.py
@@ -0,0 +1,96 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import sys
+import threading
+from io import BytesIO
+
+
+class LogThread(threading.Thread):
+    def __init__(self, queue, logger, level):
+        self.queue = queue
+        self.log_func = getattr(logger, level)
+        threading.Thread.__init__(self, name="Thread-Log")
+        self.daemon = True
+
+    def run(self):
+        while True:
+            try:
+                msg = self.queue.get()
+            except (EOFError, IOError):
+                break
+            if msg is None:
+                break
+            else:
+                self.log_func(msg)
+
+
+class LoggingWrapper(BytesIO):
+    """Wrapper for file like objects to redirect output to logger
+    instead"""
+
+    def __init__(self, queue, prefix=None):
+        BytesIO.__init__(self)
+        self.queue = queue
+        self.prefix = prefix
+        self.buffer = self
+
+    def write(self, data):
+        if isinstance(data, bytes):
+            try:
+                data = data.decode("utf8")
+            except UnicodeDecodeError:
+                data = data.decode("unicode_escape")
+
+        if data.endswith("\n"):
+            data = data[:-1]
+        if data.endswith("\r"):
+            data = data[:-1]
+        if not data:
+            return
+        if self.prefix is not None:
+            data = "%s: %s" % (self.prefix, data)
+        self.queue.put(data)
+
+    def flush(self):
+        pass
+
+
+class CaptureIO(object):
+    def __init__(self, logger, do_capture, mp_context=None):
+        if mp_context is None:
+            import multiprocessing as mp_context
+        self.logger = logger
+        self.do_capture = do_capture
+        self.logging_queue = None
+        self.logging_thread = None
+        self.original_stdio = None
+        self.mp_context = mp_context
+
+    def __enter__(self):
+        if self.do_capture:
+            self.original_stdio = (sys.stdout, sys.stderr)
+            self.logging_queue = self.mp_context.Queue()
+            self.logging_thread = LogThread(self.logging_queue, self.logger, "info")
+            sys.stdout = LoggingWrapper(self.logging_queue, prefix="STDOUT")
+            sys.stderr = LoggingWrapper(self.logging_queue, prefix="STDERR")
+            self.logging_thread.start()
+
+    def __exit__(self, *args, **kwargs):
+        if self.do_capture:
+            sys.stdout, sys.stderr = self.original_stdio
+            if self.logging_queue is not None:
+                self.logger.info("Closing logging queue")
+                self.logging_queue.put(None)
+                if self.logging_thread is not None:
+                    self.logging_thread.join(10)
+                while not self.logging_queue.empty():
+                    try:
+                        self.logger.warning(
+                            "Dropping log message: %r", self.logging_queue.get()
+                        )
+                    except Exception:
+                        pass
+                self.logging_queue.close()
+                self.logger.info("queue closed")
diff --git a/testing/mozbase/mozlog/mozlog/commandline.py b/testing/mozbase/mozlog/mozlog/commandline.py
new file mode 100644
index 0000000000..51e9ea6929
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/commandline.py
@@ -0,0 +1,344 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import argparse
+import optparse
+import os
+import sys
+from collections import defaultdict
+
+import six
+
+from . import formatters, handlers
+from .structuredlog import StructuredLogger, set_default_logger
+
+log_formatters = {
+    "raw": (
+        formatters.JSONFormatter,
+        "Raw structured log messages " "(provided by mozlog)",
+    ),
+    "unittest": (
+        formatters.UnittestFormatter,
+        "Unittest style output " "(provided by mozlog)",
+    ),
+    "xunit": (
+        formatters.XUnitFormatter,
+        "xUnit compatible XML " "(provided by mozlog)",
+    ),
+    "html": (formatters.HTMLFormatter, "HTML report " "(provided by mozlog)"),
+    "mach": (formatters.MachFormatter, "Human-readable output " "(provided by mozlog)"),
+    "tbpl": (formatters.TbplFormatter, "TBPL style log format " "(provided by mozlog)"),
+    "grouped": (
+        formatters.GroupingFormatter,
+        "Grouped summary of test results " "(provided by mozlog)",
+    ),
+    "errorsummary": (formatters.ErrorSummaryFormatter, argparse.SUPPRESS),
+}
+
+TEXT_FORMATTERS = ("raw", "mach")
+"""a subset of formatters for non test harnesses related applications"""
+
+
+DOCS_URL = "https://firefox-source-docs.mozilla.org/mozbase/mozlog.html"
+
+
+def level_filter_wrapper(formatter, level):
+    return handlers.LogLevelFilter(formatter, level)
+
+
+def verbose_wrapper(formatter, verbose):
+    formatter.verbose = verbose
+    return formatter
+
+
+def compact_wrapper(formatter, compact):
+    formatter.compact = compact
+    return formatter
+
+
+def buffer_handler_wrapper(handler, buffer_limit):
+    if buffer_limit == "UNLIMITED":
+        buffer_limit = None
+    else:
+        buffer_limit = int(buffer_limit)
+    return handlers.BufferHandler(handler, buffer_limit)
+
+
+def screenshot_wrapper(formatter, enable_screenshot):
+    formatter.enable_screenshot = enable_screenshot
+    return formatter
+
+
+def valgrind_handler_wrapper(handler):
+    return handlers.ValgrindHandler(handler)
+
+
+def default_formatter_options(log_type, overrides):
+    formatter_option_defaults = {"raw": {"level": "debug"}}
+    rv = {"verbose": False, "level": "info"}
+    rv.update(formatter_option_defaults.get(log_type, {}))
+
+    if overrides is not None:
+        rv.update(overrides)
+
+    return rv
+
+
+fmt_options = {
+    # <option name>: (<wrapper function>, description, <applicable formatters>, action)
+    # "action" is used by the commandline parser in use.
+    "verbose": (
+        verbose_wrapper,
+        "Enables verbose mode for the given formatter.",
+        {"mach"},
+        "store_true",
+    ),
+    "compact": (
+        compact_wrapper,
+        "Enables compact mode for the given formatter.",
+        {"tbpl"},
+        "store_true",
+    ),
+    "level": (
+        level_filter_wrapper,
+        "A least log level to subscribe to for the given formatter "
+        "(debug, info, error, etc.)",
+        {"mach", "raw", "tbpl"},
+        "store",
+    ),
+    "buffer": (
+        buffer_handler_wrapper,
+        "If specified, enables message buffering at the given buffer size limit.",
+        ["mach", "tbpl"],
+        "store",
+    ),
+    "screenshot": (
+        screenshot_wrapper,
+        "Enable logging reftest-analyzer compatible screenshot data.",
+        {"mach"},
+        "store_true",
+    ),
+    "no-screenshot": (
+        screenshot_wrapper,
+        "Disable logging reftest-analyzer compatible screenshot data.",
+        {"mach"},
+        "store_false",
+    ),
+}
+
+
+def log_file(name):
+    if name == "-":
+        return sys.stdout
+    # ensure we have a correct dirpath by using realpath
+    dirpath = os.path.dirname(os.path.realpath(name))
+    if not os.path.exists(dirpath):
+        os.makedirs(dirpath)
+    return open(name, "w")
+
+
+def add_logging_group(parser, include_formatters=None):
+    """
+    Add logging options to an argparse ArgumentParser or
+    optparse OptionParser.
+
+    Each formatter has a corresponding option of the form --log-{name}
+    where {name} is the name of the formatter. The option takes a value
+    which is either a filename or "-" to indicate stdout.
+
+    :param parser: The ArgumentParser or OptionParser object that should have
+                   logging options added.
+    :param include_formatters: List of formatter names that should be included
+                               in the option group. Default to None, meaning
+                               all the formatters are included. A common use
+                               of this option is to specify
+                               :data:`TEXT_FORMATTERS` to include only the
+                               most useful formatters for a command line tool
+                               that is not related to test harnesses.
+    """
+    group_name = "Output Logging"
+    group_description = (
+        "Each option represents a possible logging format "
+        "and takes a filename to write that format to, "
+        "or '-' to write to stdout. Some options are "
+        "provided by the mozlog utility; see %s "
+        "for extended documentation." % DOCS_URL
+    )
+
+    if include_formatters is None:
+        include_formatters = list(log_formatters.keys())
+
+    if isinstance(parser, optparse.OptionParser):
+        group = optparse.OptionGroup(parser, group_name, group_description)
+        parser.add_option_group(group)
+        opt_log_type = "str"
+        group_add = group.add_option
+    else:
+        group = parser.add_argument_group(group_name, group_description)
+        opt_log_type = log_file
+        group_add = group.add_argument
+
+    for name, (cls, help_str) in six.iteritems(log_formatters):
+        if name in include_formatters:
+            group_add(
+                "--log-" + name, action="append", type=opt_log_type, help=help_str
+            )
+
+    for fmt in include_formatters:
+        for optname, (cls, help_str, formatters_, action) in six.iteritems(fmt_options):
+            if fmt not in formatters_:
+                continue
+            if optname.startswith("no-") and action == "store_false":
+                dest = optname.split("-", 1)[1]
+            else:
+                dest = optname
+            dest = dest.replace("-", "_")
+            group_add(
+                "--log-%s-%s" % (fmt, optname),
+                action=action,
+                help=help_str,
+                default=None,
+                dest="log_%s_%s" % (fmt, dest),
+            )
+
+
+def setup_handlers(logger, formatters, formatter_options, allow_unused_options=False):
+    """
+    Add handlers to the given logger according to the formatters and
+    options provided.
+
+    :param logger: The logger configured by this function.
+    :param formatters: A dict of {formatter, [streams]} to use in handlers.
+    :param formatter_options: a dict of {formatter: {option: value}} to
+                              to use when configuring formatters.
+    """
+    unused_options = set(formatter_options.keys()) - set(formatters.keys())
+    if unused_options and not allow_unused_options:
+        msg = "Options specified for unused formatter(s) (%s) have no effect" % list(
+            unused_options
+        )
+        raise ValueError(msg)
+
+    for fmt, streams in six.iteritems(formatters):
+        formatter_cls = log_formatters[fmt][0]
+        formatter = formatter_cls()
+        handler_wrappers_and_options = []
+
+        for option, value in six.iteritems(formatter_options[fmt]):
+            wrapper, wrapper_args = None, ()
+            if option == "valgrind":
+                wrapper = valgrind_handler_wrapper
+            elif option == "buffer":
+                wrapper, wrapper_args = fmt_options[option][0], (value,)
+            else:
+                formatter = fmt_options[option][0](formatter, value)
+
+            if wrapper is not None:
+                handler_wrappers_and_options.append((wrapper, wrapper_args))
+
+        for value in streams:
+            handler = handlers.StreamHandler(stream=value, formatter=formatter)
+            for wrapper, wrapper_args in handler_wrappers_and_options:
+                handler = wrapper(handler, *wrapper_args)
+            logger.add_handler(handler)
+
+
+def setup_logging(
+    logger, args, defaults=None, formatter_defaults=None, allow_unused_options=False
+):
+    """
+    Configure a structuredlogger based on command line arguments.
+
+    The created structuredlogger will also be set as the default logger, and
+    can be retrieved with :py:func:`~mozlog.get_default_logger`.
+
+    :param logger: A StructuredLogger instance or string name. If a string, a
+                   new StructuredLogger instance will be created using
+                   `logger` as the name.
+    :param args: A dictionary of {argument_name:value} produced from
+                 parsing the command line arguments for the application
+    :param defaults: A dictionary of {formatter name: output stream} to apply
+                     when there is no logging supplied on the command line. If
+                     this isn't supplied, reasonable defaults are chosen
+                     (coloured mach formatting if stdout is a terminal, or raw
+                     logs otherwise).
+    :param formatter_defaults: A dictionary of {option_name: default_value} to provide
+                               to the formatters in the absence of command line overrides.
+    :rtype: StructuredLogger
+    """
+
+    if not isinstance(logger, StructuredLogger):
+        logger = StructuredLogger(logger)
+        # The likely intent when using this function is to get a brand new
+        # logger, so reset state in case it was previously initialized.
+        logger.reset_state()
+
+    # Keep track of any options passed for formatters.
+    formatter_options = {}
+    # Keep track of formatters and list of streams specified.
+    formatters = defaultdict(list)
+    found = False
+    found_stdout_logger = False
+    if args is None:
+        args = {}
+    if not isinstance(args, dict):
+        args = vars(args)
+
+    if defaults is None:
+        if sys.__stdout__.isatty():
+            defaults = {"mach": sys.stdout}
+        else:
+            defaults = {"raw": sys.stdout}
+
+    for name, values in six.iteritems(args):
+        parts = name.split("_")
+        if len(parts) > 3:
+            continue
+        # Our args will be ['log', <formatter>]
+        #               or ['log', <formatter>, <option>]
+        #               or ['valgrind']
+        if parts[0] == "log" and values is not None:
+            if len(parts) == 1 or parts[1] not in log_formatters:
+                continue
+            if len(parts) == 2:
+                _, formatter = parts
+                for value in values:
+                    found = True
+                    if isinstance(value, six.string_types):
+                        value = log_file(value)
+                    if value == sys.stdout:
+                        found_stdout_logger = True
+                    formatters[formatter].append(value)
+            if len(parts) == 3:
+                _, formatter, opt = parts
+                if formatter not in formatter_options:
+                    formatter_options[formatter] = default_formatter_options(
+                        formatter, formatter_defaults
+                    )
+                formatter_options[formatter][opt] = values
+
+    # If there is no user-specified logging, go with the default options
+    if not found:
+        for name, value in six.iteritems(defaults):
+            formatters[name].append(value)
+
+    elif not found_stdout_logger and sys.stdout in list(defaults.values()):
+        for name, value in six.iteritems(defaults):
+            if value == sys.stdout:
+                formatters[name].append(value)
+
+    for name in formatters:
+        if name not in formatter_options:
+            formatter_options[name] = default_formatter_options(
+                name, formatter_defaults
+            )
+
+    # If the user specified --valgrind, add it as an option for all formatters
+    if args.get("valgrind", None) is not None:
+        for name in formatters:
+            formatter_options[name]["valgrind"] = True
+    setup_handlers(logger, formatters, formatter_options, allow_unused_options)
+    set_default_logger(logger)
+
+    return logger
diff --git a/testing/mozbase/mozlog/mozlog/formatters/__init__.py b/testing/mozbase/mozlog/mozlog/formatters/__init__.py
new file mode 100644
index 0000000000..962fb92ca4
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/formatters/__init__.py
@@ -0,0 +1,32 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from .errorsummary import ErrorSummaryFormatter
+from .grouping import GroupingFormatter
+from .html import HTMLFormatter
+from .machformatter import MachFormatter
+from .tbplformatter import TbplFormatter
+from .unittest import UnittestFormatter
+from .xunit import XUnitFormatter
+
+try:
+    import ujson as json
+except ImportError:
+    import json
+
+
+def JSONFormatter():
+    return lambda x: json.dumps(x) + "\n"
+
+
+__all__ = [
+    "UnittestFormatter",
+    "XUnitFormatter",
+    "HTMLFormatter",
+    "MachFormatter",
+    "TbplFormatter",
+    "ErrorSummaryFormatter",
+    "JSONFormatter",
+    "GroupingFormatter",
+]
diff --git a/testing/mozbase/mozlog/mozlog/formatters/base.py b/testing/mozbase/mozlog/mozlog/formatters/base.py
new file mode 100644
index 0000000000..407514b741
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/formatters/base.py
@@ -0,0 +1,25 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from mozlog.handlers.messagehandler import MessageHandler
+
+from ..reader import LogHandler
+
+
+class BaseFormatter(LogHandler):
+    """Base class for implementing non-trivial formatters.
+
+    Subclasses are expected to provide a method for each action type they
+    wish to handle, each taking a single argument for the test data.
+    For example a trivial subclass that just produces the id of each test as
+    it starts might be::
+
+      class StartIdFormatter(BaseFormatter);
+          def test_start(data):
+              #For simplicity in the example pretend the id is always a string
+              return data["test"]
+    """
+
+    def __init__(self):
+        self.message_handler = MessageHandler()
diff --git a/testing/mozbase/mozlog/mozlog/formatters/errorsummary.py b/testing/mozbase/mozlog/mozlog/formatters/errorsummary.py
new file mode 100644
index 0000000000..b1d26ce94e
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/formatters/errorsummary.py
@@ -0,0 +1,163 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+import json
+from collections import defaultdict
+
+from .base import BaseFormatter
+
+
+class ErrorSummaryFormatter(BaseFormatter):
+    def __init__(self):
+        self.test_to_group = {}
+        self.groups = defaultdict(
+            lambda: {
+                "status": None,
+                "start": None,
+                "end": None,
+            }
+        )
+        self.line_count = 0
+
+    def __call__(self, data):
+        rv = BaseFormatter.__call__(self, data)
+        self.line_count += 1
+        return rv
+
+    def _output(self, data_type, data):
+        data["action"] = data_type
+        data["line"] = self.line_count
+        return "%s\n" % json.dumps(data)
+
+    def _output_test(self, test, subtest, item):
+        data = {
+            "test": test,
+            "subtest": subtest,
+            "group": self.test_to_group.get(test, ""),
+            "status": item["status"],
+            "expected": item["expected"],
+            "message": item.get("message"),
+            "stack": item.get("stack"),
+            "known_intermittent": item.get("known_intermittent", []),
+        }
+        return self._output("test_result", data)
+
+    def _update_group_result(self, group, item):
+        ginfo = self.groups[group]
+
+        if item["status"] == "SKIP":
+            if ginfo["status"] is None:
+                ginfo["status"] = "SKIP"
+        elif (
+            ("expected" not in item and item["status"] in ["OK", "PASS"])
+            or ("expected" in item and item["status"] == item["expected"])
+            or item["status"] in item.get("known_intermittent", [])
+        ):
+            if ginfo["status"] in (None, "SKIP"):
+                ginfo["status"] = "OK"
+        else:
+            ginfo["status"] = "ERROR"
+
+    def suite_start(self, item):
+        self.test_to_group = {v: k for k in item["tests"] for v in item["tests"][k]}
+        return self._output("test_groups", {"groups": list(item["tests"].keys())})
+
+    def suite_end(self, data):
+        output = []
+        for group, info in self.groups.items():
+            if info["start"] is None or info["end"] is None:
+                duration = None
+            else:
+                duration = info["end"] - info["start"]
+
+            output.append(
+                self._output(
+                    "group_result",
+                    {
+                        "group": group,
+                        "status": info["status"],
+                        "duration": duration,
+                    },
+                )
+            )
+
+        return "".join(output)
+
+    def test_start(self, item):
+        group = self.test_to_group.get(item["test"], None)
+        if group and self.groups[group]["start"] is None:
+            self.groups[group]["start"] = item["time"]
+
+    def test_status(self, item):
+        group = self.test_to_group.get(item["test"], None)
+        if group:
+            self._update_group_result(group, item)
+
+        if "expected" not in item:
+            return
+
+        return self._output_test(item["test"], item["subtest"], item)
+
+    def test_end(self, item):
+        group = self.test_to_group.get(item["test"], None)
+        if group:
+            self._update_group_result(group, item)
+            self.groups[group]["end"] = item["time"]
+
+        if "expected" not in item:
+            return
+
+        return self._output_test(item["test"], None, item)
+
+    def log(self, item):
+        if item["level"] not in ("ERROR", "CRITICAL"):
+            return
+
+        data = {"level": item["level"], "message": item["message"]}
+        return self._output("log", data)
+
+    def crash(self, item):
+        data = {
+            "test": item.get("test"),
+            "signature": item["signature"],
+            "stackwalk_stdout": item.get("stackwalk_stdout"),
+            "stackwalk_stderr": item.get("stackwalk_stderr"),
+        }
+
+        if item.get("test"):
+            data["group"] = self.test_to_group.get(item["test"], "")
+            if data["group"] == "":
+                # item['test'] could be the group name, not a test name
+                if item["test"] in self.groups:
+                    data["group"] = item["test"]
+
+            # unlike test group summary, if we crash expect error unless expected
+            if (
+                (
+                    "expected" in item
+                    and "status" in item
+                    and item["status"] in item["expected"]
+                )
+                or ("expected" in item and "CRASH" == item["expected"])
+                or "status" in item
+                and item["status"] in item.get("known_intermittent", [])
+            ):
+                self.groups[data["group"]]["status"] = "PASS"
+            else:
+                self.groups[data["group"]]["status"] = "ERROR"
+
+        return self._output("crash", data)
+
+    def lint(self, item):
+        data = {
+            "level": item["level"],
+            "path": item["path"],
+            "message": item["message"],
+            "lineno": item["lineno"],
+            "column": item.get("column"),
+            "rule": item.get("rule"),
+            "linter": item.get("linter"),
+        }
+        self._output("lint", data)
diff --git a/testing/mozbase/mozlog/mozlog/formatters/grouping.py b/testing/mozbase/mozlog/mozlog/formatters/grouping.py
new file mode 100644
index 0000000000..36993b5595
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/formatters/grouping.py
@@ -0,0 +1,391 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+import collections
+import os
+import platform
+import subprocess
+import sys
+
+import six
+
+from mozlog.formatters import base
+
+DEFAULT_MOVE_UP_CODE = u"\x1b[A"
+DEFAULT_CLEAR_EOL_CODE = u"\x1b[K"
+
+
+class GroupingFormatter(base.BaseFormatter):
+    """Formatter designed to produce unexpected test results grouped
+    together in a readable format."""
+
+    def __init__(self):
+        super(GroupingFormatter, self).__init__()
+        self.number_of_tests = 0
+        self.completed_tests = 0
+        self.need_to_erase_last_line = False
+        self.current_display = ""
+        self.running_tests = {}
+        self.test_output = collections.defaultdict(str)
+        self.subtest_failures = collections.defaultdict(list)
+        self.test_failure_text = ""
+        self.tests_with_failing_subtests = []
+        self.interactive = os.isatty(sys.stdout.fileno())
+        self.show_logs = False
+
+        self.message_handler.register_message_handlers(
+            "show_logs",
+            {
+                "on": self._enable_show_logs,
+                "off": self._disable_show_logs,
+            },
+        )
+
+        # TODO(mrobinson, 8313): We need to add support for Windows terminals here.
+        if self.interactive:
+            self.move_up, self.clear_eol = self.get_move_up_and_clear_eol_codes()
+            if platform.system() != "Windows":
+                self.line_width = int(
+                    subprocess.check_output(["stty", "size"]).split()[1]
+                )
+            else:
+                # Until we figure out proper Windows support,
+                # this makes things work well enough to run.
+                self.line_width = 80
+
+        self.expected = {
+            "OK": 0,
+            "PASS": 0,
+            "FAIL": 0,
+            "PRECONDITION_FAILED": 0,
+            "ERROR": 0,
+            "TIMEOUT": 0,
+            "SKIP": 0,
+            "CRASH": 0,
+        }
+
+        self.unexpected_tests = {
+            "OK": [],
+            "PASS": [],
+            "FAIL": [],
+            "PRECONDITION_FAILED": [],
+            "ERROR": [],
+            "TIMEOUT": [],
+            "CRASH": [],
+        }
+
+        # Follows the format of {(<test>, <subtest>): <data>}, where
+        # (<test>, None) represents a top level test.
+        self.known_intermittent_results = {}
+
+    def _enable_show_logs(self):
+        self.show_logs = True
+
+    def _disable_show_logs(self):
+        self.show_logs = False
+
+    def get_move_up_and_clear_eol_codes(self):
+        try:
+            import blessed
+        except ImportError:
+            return DEFAULT_MOVE_UP_CODE, DEFAULT_CLEAR_EOL_CODE
+
+        try:
+            self.terminal = blessed.Terminal()
+            return self.terminal.move_up, self.terminal.clear_eol
+        except Exception as exception:
+            sys.stderr.write(
+                "GroupingFormatter: Could not get terminal "
+                "control characters: %s\n" % exception
+            )
+            return DEFAULT_MOVE_UP_CODE, DEFAULT_CLEAR_EOL_CODE
+
+    def text_to_erase_display(self):
+        if not self.interactive or not self.current_display:
+            return ""
+        return (self.move_up + self.clear_eol) * self.current_display.count("\n")
+
+    def generate_output(self, text=None, new_display=None):
+        if not self.interactive:
+            return text
+
+        output = self.text_to_erase_display()
+        if text:
+            output += text
+        if new_display is not None:
+            self.current_display = new_display
+        return output + self.current_display
+
+    def build_status_line(self):
+        if self.number_of_tests == 0:
+            new_display = "  [%i] " % self.completed_tests
+        else:
+            new_display = "  [%i/%i] " % (self.completed_tests, self.number_of_tests)
+
+        if self.running_tests:
+            indent = " " * len(new_display)
+            if self.interactive:
+                max_width = self.line_width - len(new_display)
+            else:
+                max_width = sys.maxsize
+            return (
+                new_display
+                + ("\n%s" % indent).join(
+                    val[:max_width] for val in self.running_tests.values()
+                )
+                + "\n"
+            )
+        else:
+            return new_display + "No tests running.\n"
+
+    def suite_start(self, data):
+        self.number_of_tests = sum(
+            len(tests) for tests in six.itervalues(data["tests"])
+        )
+        self.start_time = data["time"]
+
+        if self.number_of_tests == 0:
+            return "Running tests in %s\n\n" % data[u"source"]
+        else:
+            return "Running %i tests in %s\n\n" % (
+                self.number_of_tests,
+                data[u"source"],
+            )
+
+    def test_start(self, data):
+        self.running_tests[data["thread"]] = data["test"]
+        return self.generate_output(text=None, new_display=self.build_status_line())
+
+    def wrap_and_indent_lines(self, lines, indent):
+        assert len(lines) > 0
+
+        output = indent + u"\u25B6 %s\n" % lines[0]
+        for line in lines[1:-1]:
+            output += indent + u"\u2502 %s\n" % line
+        if len(lines) > 1:
+            output += indent + u"\u2514 %s\n" % lines[-1]
+        return output
+
+    def get_lines_for_unexpected_result(
+        self, test_name, status, expected, message, stack
+    ):
+        # Test names sometimes contain control characters, which we want
+        # to be printed in their raw form, and not their interpreted form.
+        test_name = test_name.encode("unicode-escape").decode("utf-8")
+
+        if expected:
+            expected_text = u" [expected %s]" % expected
+        else:
+            expected_text = u""
+
+        lines = [u"%s%s %s" % (status, expected_text, test_name)]
+        if message:
+            lines.append(u"  \u2192 %s" % message)
+        if stack:
+            lines.append("")
+            lines += [stackline for stackline in stack.splitlines()]
+        return lines
+
+    def get_lines_for_known_intermittents(self, known_intermittent_results):
+        lines = []
+
+        for (test, subtest), data in six.iteritems(self.known_intermittent_results):
+            status = data["status"]
+            known_intermittent = ", ".join(data["known_intermittent"])
+            expected = " [expected %s, known intermittent [%s]" % (
+                data["expected"],
+                known_intermittent,
+            )
+            lines += [
+                u"%s%s %s%s"
+                % (
+                    status,
+                    expected,
+                    test,
+                    (", %s" % subtest) if subtest is not None else "",
+                )
+            ]
+        output = self.wrap_and_indent_lines(lines, "  ") + "\n"
+        return output
+
+    def get_output_for_unexpected_subtests(self, test_name, unexpected_subtests):
+        if not unexpected_subtests:
+            return ""
+
+        def add_subtest_failure(lines, subtest, stack=None):
+            lines += self.get_lines_for_unexpected_result(
+                subtest.get("subtest", None),
+                subtest.get("status", None),
+                subtest.get("expected", None),
+                subtest.get("message", None),
+                stack,
+            )
+
+        def make_subtests_failure(test_name, subtests, stack=None):
+            lines = [u"Unexpected subtest result in %s:" % test_name]
+            for subtest in subtests[:-1]:
+                add_subtest_failure(lines, subtest, None)
+            add_subtest_failure(lines, subtests[-1], stack)
+            return self.wrap_and_indent_lines(lines, "  ") + "\n"
+
+        # Organize the failures by stack trace so we don't print the same stack trace
+        # more than once. They are really tall and we don't want to flood the screen
+        # with duplicate information.
+        output = ""
+        failures_by_stack = collections.defaultdict(list)
+        for failure in unexpected_subtests:
+            # Print stackless results first. They are all separate.
+            if "stack" not in failure:
+                output += make_subtests_failure(test_name, [failure], None)
+            else:
+                failures_by_stack[failure["stack"]].append(failure)
+
+        for (stack, failures) in six.iteritems(failures_by_stack):
+            output += make_subtests_failure(test_name, failures, stack)
+        return output
+
+    def test_end(self, data):
+        self.completed_tests += 1
+        test_status = data["status"]
+        test_name = data["test"]
+        known_intermittent_statuses = data.get("known_intermittent", [])
+        subtest_failures = self.subtest_failures.pop(test_name, [])
+        if "expected" in data and test_status not in known_intermittent_statuses:
+            had_unexpected_test_result = True
+        else:
+            had_unexpected_test_result = False
+
+        del self.running_tests[data["thread"]]
+        new_display = self.build_status_line()
+
+        if not had_unexpected_test_result and not subtest_failures:
+            self.expected[test_status] += 1
+            if self.interactive:
+                return self.generate_output(text=None, new_display=new_display)
+            else:
+                return self.generate_output(
+                    text="  %s\n" % test_name, new_display=new_display
+                )
+
+        if test_status in known_intermittent_statuses:
+            self.known_intermittent_results[(test_name, None)] = data
+
+        # If the test crashed or timed out, we also include any process output,
+        # because there is a good chance that the test produced a stack trace
+        # or other error messages.
+        if test_status in ("CRASH", "TIMEOUT"):
+            stack = self.test_output[test_name] + data.get("stack", "")
+        else:
+            stack = data.get("stack", None)
+
+        output = ""
+        if had_unexpected_test_result:
+            self.unexpected_tests[test_status].append(data)
+            lines = self.get_lines_for_unexpected_result(
+                test_name,
+                test_status,
+                data.get("expected", None),
+                data.get("message", None),
+                stack,
+            )
+            output += self.wrap_and_indent_lines(lines, "  ") + "\n"
+
+        if subtest_failures:
+            self.tests_with_failing_subtests.append(test_name)
+            output += self.get_output_for_unexpected_subtests(
+                test_name, subtest_failures
+            )
+        self.test_failure_text += output
+
+        return self.generate_output(text=output, new_display=new_display)
+
+    def test_status(self, data):
+        if "expected" in data and data["status"] not in data.get(
+            "known_intermittent", []
+        ):
+            self.subtest_failures[data["test"]].append(data)
+        elif data["status"] in data.get("known_intermittent", []):
+            self.known_intermittent_results[(data["test"], data["subtest"])] = data
+
+    def suite_end(self, data):
+        self.end_time = data["time"]
+
+        if not self.interactive:
+            output = u"\n"
+        else:
+            output = ""
+
+        output += u"Ran %i tests finished in %.1f seconds.\n" % (
+            self.completed_tests,
+            (self.end_time - self.start_time) / 1000.0,
+        )
+        output += u"  \u2022 %i ran as expected. %i tests skipped.\n" % (
+            sum(self.expected.values()),
+            self.expected["SKIP"],
+        )
+        if self.known_intermittent_results:
+            output += u"  \u2022 %i known intermittent results.\n" % (
+                len(self.known_intermittent_results)
+            )
+
+        def text_for_unexpected_list(text, section):
+            tests = self.unexpected_tests[section]
+            if not tests:
+                return u""
+            return u"  \u2022 %i tests %s\n" % (len(tests), text)
+
+        output += text_for_unexpected_list(u"crashed unexpectedly", "CRASH")
+        output += text_for_unexpected_list(u"had errors unexpectedly", "ERROR")
+        output += text_for_unexpected_list(u"failed unexpectedly", "FAIL")
+        output += text_for_unexpected_list(
+            u"precondition failed unexpectedly", "PRECONDITION_FAILED"
+        )
+        output += text_for_unexpected_list(u"timed out unexpectedly", "TIMEOUT")
+        output += text_for_unexpected_list(u"passed unexpectedly", "PASS")
+        output += text_for_unexpected_list(u"unexpectedly okay", "OK")
+
+        num_with_failing_subtests = len(self.tests_with_failing_subtests)
+        if num_with_failing_subtests:
+            output += (
+                u"  \u2022 %i tests had unexpected subtest results\n"
+                % num_with_failing_subtests
+            )
+        output += "\n"
+
+        # Repeat failing test output, so that it is easier to find, since the
+        # non-interactive version prints all the test names.
+        if not self.interactive and self.test_failure_text:
+            output += u"Tests with unexpected results:\n" + self.test_failure_text
+
+        if self.known_intermittent_results:
+            results = self.get_lines_for_known_intermittents(
+                self.known_intermittent_results
+            )
+            output += u"Tests with known intermittent results:\n" + results
+
+        return self.generate_output(text=output, new_display="")
+
+    def process_output(self, data):
+        if data["thread"] not in self.running_tests:
+            return
+        test_name = self.running_tests[data["thread"]]
+        self.test_output[test_name] += data["data"] + "\n"
+
+    def log(self, data):
+        if data.get("component"):
+            message = "%s %s %s" % (data["component"], data["level"], data["message"])
+        else:
+            message = "%s %s" % (data["level"], data["message"])
+        if "stack" in data:
+            message += "\n%s" % data["stack"]
+
+        # We are logging messages that begin with STDERR, because that is how exceptions
+        # in this formatter are indicated.
+        if data["message"].startswith("STDERR"):
+            return self.generate_output(text=message + "\n")
+
+        if data["level"] in ("CRITICAL", "ERROR"):
+            return self.generate_output(text=message + "\n")
+        # Show all messages if show_logs switched on.
+        if self.show_logs:
+            return self.generate_output(text=message + "\n")
diff --git a/testing/mozbase/mozlog/mozlog/formatters/html/__init__.py b/testing/mozbase/mozlog/mozlog/formatters/html/__init__.py
new file mode 100644
index 0000000000..01348f8dfc
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/formatters/html/__init__.py
@@ -0,0 +1,7 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from .html import HTMLFormatter
+
+__all__ = ["HTMLFormatter"]
diff --git a/testing/mozbase/mozlog/mozlog/formatters/html/html.py b/testing/mozbase/mozlog/mozlog/formatters/html/html.py
new file mode 100755
index 0000000000..c2cb0d5acc
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/formatters/html/html.py
@@ -0,0 +1,343 @@
+#!/usr/bin/env python
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import base64
+import json
+import os
+from collections import defaultdict
+from datetime import datetime
+
+import six
+
+from .. import base
+
+html = None
+raw = None
+
+if six.PY2:
+    from cgi import escape
+else:
+    from html import escape
+
+base_path = os.path.split(__file__)[0]
+
+
+def do_defered_imports():
+    global html
+    global raw
+
+    from .xmlgen import html, raw
+
+
+class HTMLFormatter(base.BaseFormatter):
+    """Formatter that produces a simple HTML-formatted report."""
+
+    def __init__(self):
+        do_defered_imports()
+        self.suite_name = None
+        self.result_rows = []
+        self.test_count = defaultdict(int)
+        self.start_times = {}
+        self.suite_times = {"start": None, "end": None}
+        self.head = None
+        self.env = {}
+
+    def suite_start(self, data):
+        self.suite_times["start"] = data["time"]
+        self.suite_name = data["source"]
+        with open(os.path.join(base_path, "style.css")) as f:
+            self.head = html.head(
+                html.meta(charset="utf-8"),
+                html.title(data["source"]),
+                html.style(raw(f.read())),
+            )
+
+        date_format = "%d %b %Y %H:%M:%S"
+        version_info = data.get("version_info")
+        if version_info:
+            self.env["Device identifier"] = version_info.get("device_id")
+            self.env["Device firmware (base)"] = version_info.get(
+                "device_firmware_version_base"
+            )
+            self.env["Device firmware (date)"] = (
+                datetime.utcfromtimestamp(
+                    int(version_info.get("device_firmware_date"))
+                ).strftime(date_format)
+                if "device_firmware_date" in version_info
+                else None
+            )
+            self.env["Device firmware (incremental)"] = version_info.get(
+                "device_firmware_version_incremental"
+            )
+            self.env["Device firmware (release)"] = version_info.get(
+                "device_firmware_version_release"
+            )
+            self.env["Gaia date"] = (
+                datetime.utcfromtimestamp(int(version_info.get("gaia_date"))).strftime(
+                    date_format
+                )
+                if "gaia_date" in version_info
+                else None
+            )
+            self.env["Gecko version"] = version_info.get("application_version")
+            self.env["Gecko build"] = version_info.get("application_buildid")
+
+            if version_info.get("application_changeset"):
+                self.env["Gecko revision"] = version_info.get("application_changeset")
+                if version_info.get("application_repository"):
+                    self.env["Gecko revision"] = html.a(
+                        version_info.get("application_changeset"),
+                        href="/rev/".join(
+                            [
+                                version_info.get("application_repository"),
+                                version_info.get("application_changeset"),
+                            ]
+                        ),
+                        target="_blank",
+                    )
+
+            if version_info.get("gaia_changeset"):
+                self.env["Gaia revision"] = html.a(
+                    version_info.get("gaia_changeset")[:12],
+                    href="https://github.com/mozilla-b2g/gaia/commit/%s"
+                    % version_info.get("gaia_changeset"),
+                    target="_blank",
+                )
+
+        device_info = data.get("device_info")
+        if device_info:
+            self.env["Device uptime"] = device_info.get("uptime")
+            self.env["Device memory"] = device_info.get("memtotal")
+            self.env["Device serial"] = device_info.get("id")
+
+    def suite_end(self, data):
+        self.suite_times["end"] = data["time"]
+        return self.generate_html()
+
+    def test_start(self, data):
+        self.start_times[data["test"]] = data["time"]
+
+    def test_end(self, data):
+        self.make_result_html(data)
+
+    def make_result_html(self, data):
+        tc_time = (data["time"] - self.start_times.pop(data["test"])) / 1000.0
+        additional_html = []
+        debug = data.get("extra", {})
+        # Add support for log exported from wptrunner. The structure of
+        # reftest_screenshots is listed in wptrunner/executors/base.py.
+        if debug.get("reftest_screenshots"):
+            log_data = debug.get("reftest_screenshots", {})
+            debug = {
+                "image1": "data:image/png;base64," + log_data[0].get("screenshot", {}),
+                "image2": "data:image/png;base64," + log_data[2].get("screenshot", {}),
+                "differences": "Not Implemented",
+            }
+
+        links_html = []
+
+        status = status_name = data["status"]
+        expected = data.get("expected", status)
+        known_intermittent = data.get("known_intermittent", [])
+
+        if status != expected and status not in known_intermittent:
+            status_name = "UNEXPECTED_" + status
+        elif status in known_intermittent:
+            status_name = "KNOWN_INTERMITTENT"
+        elif status not in ("PASS", "SKIP"):
+            status_name = "EXPECTED_" + status
+
+        self.test_count[status_name] += 1
+
+        if status in ["SKIP", "FAIL", "PRECONDITION_FAILED", "ERROR"]:
+            if debug.get("differences"):
+                images = [
+                    ("image1", "Image 1 (test)"),
+                    ("image2", "Image 2 (reference)"),
+                ]
+                for title, description in images:
+                    screenshot = "%s" % debug[title]
+                    additional_html.append(
+                        html.div(
+                            html.a(html.img(src=screenshot), href="#"),
+                            html.br(),
+                            html.a(description),
+                            class_="screenshot",
+                        )
+                    )
+
+            if debug.get("screenshot"):
+                screenshot = "%s" % debug["screenshot"]
+                screenshot = "data:image/png;base64," + screenshot
+
+                additional_html.append(
+                    html.div(
+                        html.a(html.img(src=screenshot), href="#"), class_="screenshot"
+                    )
+                )
+
+            for name, content in debug.items():
+                if name in ["screenshot", "image1", "image2"]:
+                    if not content.startswith("data:image/png;base64,"):
+                        href = "data:image/png;base64,%s" % content
+                    else:
+                        href = content
+                else:
+                    if not isinstance(content, (six.text_type, six.binary_type)):
+                        # All types must be json serializable
+                        content = json.dumps(content)
+                        # Decode to text type if JSON output is byte string
+                        if not isinstance(content, six.text_type):
+                            content = content.decode("utf-8")
+                    # Encode base64 to avoid that some browsers (such as Firefox, Opera)
+                    # treats '#' as the start of another link if it is contained in the data URL.
+                    if isinstance(content, six.text_type):
+                        is_known_utf8 = True
+                        content_bytes = six.text_type(content).encode(
+                            "utf-8", "xmlcharrefreplace"
+                        )
+                    else:
+                        is_known_utf8 = False
+                        content_bytes = content
+
+                    meta = ["text/html"]
+                    if is_known_utf8:
+                        meta.append("charset=utf-8")
+
+                    # base64 is ascii only, which means we don't have to care about encoding
+                    # in the case where we don't know the encoding of the input
+                    b64_bytes = base64.b64encode(content_bytes)
+                    b64_text = b64_bytes.decode()
+                    href = "data:%s;base64,%s" % (";".join(meta), b64_text)
+                links_html.append(
+                    html.a(name.title(), class_=name, href=href, target="_blank")
+                )
+                links_html.append(" ")
+
+            log = html.div(class_="log")
+            output = data.get("stack", "").splitlines()
+            output.extend(data.get("message", "").splitlines())
+            for line in output:
+                separator = line.startswith(" " * 10)
+                if separator:
+                    log.append(line[:80])
+                else:
+                    if (
+                        line.lower().find("error") != -1
+                        or line.lower().find("exception") != -1
+                    ):
+                        log.append(html.span(raw(escape(line)), class_="error"))
+                    else:
+                        log.append(raw(escape(line)))
+                log.append(html.br())
+            additional_html.append(log)
+
+        self.result_rows.append(
+            html.tr(
+                [
+                    html.td(status_name, class_="col-result"),
+                    html.td(data["test"], class_="col-name"),
+                    html.td("%.2f" % tc_time, class_="col-duration"),
+                    html.td(links_html, class_="col-links"),
+                    html.td(additional_html, class_="debug"),
+                ],
+                class_=status_name.lower() + " results-table-row",
+            )
+        )
+
+    def generate_html(self):
+        generated = datetime.utcnow()
+        with open(os.path.join(base_path, "main.js")) as main_f:
+            doc = html.html(
+                self.head,
+                html.body(
+                    html.script(raw(main_f.read())),
+                    html.p(
+                        "Report generated on %s at %s"
+                        % (
+                            generated.strftime("%d-%b-%Y"),
+                            generated.strftime("%H:%M:%S"),
+                        )
+                    ),
+                    html.h2("Environment"),
+                    html.table(
+                        [
+                            html.tr(html.td(k), html.td(v))
+                            for k, v in sorted(self.env.items())
+                            if v
+                        ],
+                        id="environment",
+                    ),
+                    html.h2("Summary"),
+                    html.p(
+                        "%i tests ran in %.1f seconds."
+                        % (
+                            sum(six.itervalues(self.test_count)),
+                            (self.suite_times["end"] - self.suite_times["start"])
+                            / 1000.0,
+                        ),
+                        html.br(),
+                        html.span("%i passed" % self.test_count["PASS"], class_="pass"),
+                        ", ",
+                        html.span(
+                            "%i skipped" % self.test_count["SKIP"], class_="skip"
+                        ),
+                        ", ",
+                        html.span(
+                            "%i failed" % self.test_count["UNEXPECTED_FAIL"],
+                            class_="fail",
+                        ),
+                        ", ",
+                        html.span(
+                            "%i errors" % self.test_count["UNEXPECTED_ERROR"],
+                            class_="error",
+                        ),
+                        ".",
+                        html.br(),
+                        html.span(
+                            "%i expected failures" % self.test_count["EXPECTED_FAIL"],
+                            class_="expected_fail",
+                        ),
+                        ", ",
+                        html.span(
+                            "%i unexpected passes" % self.test_count["UNEXPECTED_PASS"],
+                            class_="unexpected_pass",
+                        ),
+                        ", ",
+                        html.span(
+                            "%i known intermittent results"
+                            % self.test_count["KNOWN_INTERMITTENT"],
+                            class_="known_intermittent",
+                        ),
+                        ".",
+                    ),
+                    html.h2("Results"),
+                    html.table(
+                        [
+                            html.thead(
+                                html.tr(
+                                    [
+                                        html.th(
+                                            "Result", class_="sortable", col="result"
+                                        ),
+                                        html.th("Test", class_="sortable", col="name"),
+                                        html.th(
+                                            "Duration",
+                                            class_="sortable numeric",
+                                            col="duration",
+                                        ),
+                                        html.th("Links"),
+                                    ]
+                                ),
+                                id="results-table-head",
+                            ),
+                            html.tbody(self.result_rows, id="results-table-body"),
+                        ],
+                        id="results-table",
+                    ),
+                ),
+            )
+
+        return u"<!DOCTYPE html>\n" + doc.unicode(indent=2)
diff --git a/testing/mozbase/mozlog/mozlog/formatters/html/main.js b/testing/mozbase/mozlog/mozlog/formatters/html/main.js
new file mode 100644
index 0000000000..61403f611b
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/formatters/html/main.js
@@ -0,0 +1,166 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+function toArray(iter) {
+  if (iter === null) {
+    return null;
+  }
+  return Array.prototype.slice.call(iter);
+}
+
+function find(selector, elem) {
+  if (!elem) {
+    elem = document;
+  }
+  return elem.querySelector(selector);
+}
+
+function find_all(selector, elem) {
+  if (!elem) {
+    elem = document;
+  }
+  return toArray(elem.querySelectorAll(selector));
+}
+
+addEventListener("DOMContentLoaded", function () {
+  reset_sort_headers();
+
+  split_debug_onto_two_rows();
+
+  find_all(".col-links a.screenshot").forEach(function (elem) {
+    elem.addEventListener("click", function (event) {
+      var node = elem;
+      while (node && !node.classList.contains("results-table-row")) {
+        node = node.parentNode;
+      }
+      if (node != null) {
+        if (node.nextSibling && node.nextSibling.classList.contains("debug")) {
+          var href = find(".screenshot img", node.nextSibling).src;
+          window.open(href);
+        }
+      }
+      event.preventDefault();
+    });
+  });
+
+  find_all(".screenshot a").forEach(function (elem) {
+    elem.addEventListener("click", function (event) {
+      window.open(find("img", elem).getAttribute("src"));
+      event.preventDefault();
+    });
+  });
+
+  find_all(".sortable").forEach(function (elem) {
+    elem.addEventListener("click", function (event) {
+      toggle_sort_states(elem);
+      var colIndex = toArray(elem.parentNode.childNodes).indexOf(elem);
+      var key = elem.classList.contains("numeric") ? key_num : key_alpha;
+      sort_table(elem, key(colIndex));
+    });
+  });
+});
+
+function sort_table(clicked, key_func) {
+  one_row_for_data();
+  var rows = find_all(".results-table-row");
+  var reversed = !clicked.classList.contains("asc");
+
+  var sorted_rows = sort(rows, key_func, reversed);
+
+  var parent = document.getElementById("results-table-body");
+  sorted_rows.forEach(function (elem) {
+    parent.appendChild(elem);
+  });
+
+  split_debug_onto_two_rows();
+}
+
+function sort(items, key_func, reversed) {
+  var sort_array = items.map(function (item, i) {
+    return [key_func(item), i];
+  });
+  var multiplier = reversed ? -1 : 1;
+
+  sort_array.sort(function (a, b) {
+    var key_a = a[0];
+    var key_b = b[0];
+    return multiplier * (key_a >= key_b ? 1 : -1);
+  });
+
+  return sort_array.map(function (item) {
+    var index = item[1];
+    return items[index];
+  });
+}
+
+function key_alpha(col_index) {
+  return function (elem) {
+    return elem.childNodes[col_index].firstChild.data.toLowerCase();
+  };
+}
+
+function key_num(col_index) {
+  return function (elem) {
+    return parseFloat(elem.childNodes[col_index].firstChild.data);
+  };
+}
+
+function reset_sort_headers() {
+  find_all(".sort-icon").forEach(function (elem) {
+    elem.remove();
+  });
+  find_all(".sortable").forEach(function (elem) {
+    var icon = document.createElement("div");
+    icon.className = "sort-icon";
+    icon.textContent = "vvv";
+    elem.insertBefore(icon, elem.firstChild);
+    elem.classList.remove("desc", "active");
+    elem.classList.add("asc", "inactive");
+  });
+}
+
+function toggle_sort_states(elem) {
+  // if active, toggle between asc and desc
+  if (elem.classList.contains("active")) {
+    elem.classList.toggle("asc");
+    elem.classList.toggle("desc");
+  }
+
+  // if inactive, reset all other functions and add ascending active
+  if (elem.classList.contains("inactive")) {
+    reset_sort_headers();
+    elem.classList.remove("inactive");
+    elem.classList.add("active");
+  }
+}
+
+function split_debug_onto_two_rows() {
+  find_all("tr.results-table-row").forEach(function (elem) {
+    var new_row = document.createElement("tr");
+    new_row.className = "debug";
+    elem.parentNode.insertBefore(new_row, elem.nextSibling);
+    find_all(".debug", elem).forEach(function (td_elem) {
+      if (find(".log", td_elem)) {
+        new_row.appendChild(td_elem);
+        td_elem.colSpan = 5;
+      } else {
+        td_elem.remove();
+      }
+    });
+  });
+}
+
+function one_row_for_data() {
+  find_all("tr.results-table-row").forEach(function (elem) {
+    if (elem.nextSibling.classList.contains("debug")) {
+      toArray(elem.nextSibling.childNodes).forEach(function (td_elem) {
+        elem.appendChild(td_elem);
+      });
+    } else {
+      var new_td = document.createElement("td");
+      new_td.className = "debug";
+      elem.appendChild(new_td);
+    }
+  });
+}
diff --git a/testing/mozbase/mozlog/mozlog/formatters/html/style.css b/testing/mozbase/mozlog/mozlog/formatters/html/style.css
new file mode 100644
index 0000000000..427742dd1f
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/formatters/html/style.css
@@ -0,0 +1,155 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+body {
+	font-family: Helvetica, Arial, sans-serif;
+	font-size: 12px;
+	min-width: 1200px;
+	color: #999;
+}
+h2 {
+	font-size: 16px;
+	color: black;
+}
+
+p {
+    color: black;
+}
+
+a {
+	color: #999;
+}
+
+table {
+	border-collapse: collapse;
+}
+
+/******************************
+ * SUMMARY INFORMATION
+ ******************************/
+
+#environment td {
+	padding: 5px;
+	border: 1px solid #E6E6E6;
+}
+
+#environment tr:nth-child(odd) {
+	background-color: #f6f6f6;
+}
+
+/******************************
+ * TEST RESULT COLORS
+ ******************************/
+span.pass, .pass .col-result {
+	color: green;
+}
+span.expected_fail, .expected_fail .col-result,
+span.expected_skip, .expected_skip .col-result,
+span.skip, .skip .col-result,
+span.known_intermittent, .known_intermittent .col-result {
+	color: orange;
+}
+span.error, .error .col-result,
+span.fail, .fail .col-result,
+span.unexpected_error, .unexpected_error .col-result,
+span.unexpected_fail, .unexpected_fail .col-result,
+span.unexpected_pass, .unexpected_pass .col-result {
+	color: red;
+}
+
+/******************************
+ * RESULTS TABLE
+ *
+ * 1. Table Layout
+ * 2. Debug
+ * 3. Sorting items
+ *
+ ******************************/
+
+/*------------------
+ * 1. Table Layout
+ *------------------*/
+
+#results-table {
+	border: 1px solid #e6e6e6;
+	color: #999;
+	font-size: 12px;
+	width: 100%
+}
+
+#results-table th, #results-table td {
+	padding: 5px;
+	border: 1px solid #E6E6E6;
+	text-align: left
+}
+#results-table th {
+	font-weight: bold
+}
+
+/*------------------
+ * 2. Debug
+ *------------------*/
+
+.log:only-child {
+	height: inherit
+}
+.log {
+	background-color: #e6e6e6;
+	border: 1px solid #e6e6e6;
+	color: black;
+	display: block;
+	font-family: "Courier New", Courier, monospace;
+	height: 230px;
+	overflow-y: scroll;
+	padding: 5px;
+	white-space: pre-wrap
+}
+div.screenshot {
+	border: 1px solid #e6e6e6;
+	float: left;
+	margin-left: 5px;
+	height: 220px
+}
+div.screenshot img {
+	height: 220px
+}
+
+/*if the result is passed or xpassed don't show debug row*/
+.passed + .debug, .unexpected.pass + .debug {
+	display: none;
+}
+
+/*------------------
+ * 3. Sorting items
+ *------------------*/
+.sortable {
+	cursor: pointer;
+}
+
+.sort-icon {
+	font-size: 0px;
+	float: left;
+	margin-right: 5px;
+	margin-top: 5px;
+	/*triangle*/
+	width: 0;
+	height: 0;
+	border-left: 8px solid transparent;
+	border-right: 8px solid transparent;
+}
+
+.inactive .sort-icon {
+	/*finish triangle*/
+	border-top: 8px solid #E6E6E6;
+}
+
+.asc.active .sort-icon {
+	/*finish triangle*/
+	border-bottom: 8px solid #999;
+}
+
+.desc.active .sort-icon {
+	/*finish triangle*/
+	border-top: 8px solid #999;
+}
diff --git a/testing/mozbase/mozlog/mozlog/formatters/html/xmlgen.py b/testing/mozbase/mozlog/mozlog/formatters/html/xmlgen.py
new file mode 100644
index 0000000000..933958b9f1
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/formatters/html/xmlgen.py
@@ -0,0 +1,312 @@
+"""
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+This file is originally from: https://bitbucket.org/hpk42/py, specifically:
+https://bitbucket.org/hpk42/py/src/980c8d526463958ee7cae678a7e4e9b054f36b94/py/_xmlgen.py?at=default
+by holger krekel, holger at merlinux eu. 2009
+"""
+
+import re
+import sys
+
+if sys.version_info >= (3, 0):
+
+    def u(s):
+        return s
+
+    def unicode(x):
+        if hasattr(x, "__unicode__"):
+            return x.__unicode__()
+        return str(x)
+
+
+else:
+
+    def u(s):
+        return unicode(s)
+
+    # pylint: disable=W1612
+    unicode = unicode
+
+
+class NamespaceMetaclass(type):
+    def __getattr__(self, name):
+        if name[:1] == "_":
+            raise AttributeError(name)
+        if self == Namespace:
+            raise ValueError("Namespace class is abstract")
+        tagspec = self.__tagspec__
+        if tagspec is not None and name not in tagspec:
+            raise AttributeError(name)
+        classattr = {}
+        if self.__stickyname__:
+            classattr["xmlname"] = name
+        cls = type(name, (self.__tagclass__,), classattr)
+        setattr(self, name, cls)
+        return cls
+
+
+class Tag(list):
+    class Attr(object):
+        def __init__(self, **kwargs):
+            self.__dict__.update(kwargs)
+
+    def __init__(self, *args, **kwargs):
+        super(Tag, self).__init__(args)
+        self.attr = self.Attr(**kwargs)
+
+    def __unicode__(self):
+        return self.unicode(indent=0)
+
+    __str__ = __unicode__
+
+    def unicode(self, indent=2):
+        l = []
+        SimpleUnicodeVisitor(l.append, indent).visit(self)
+        return u("").join(l)
+
+    def __repr__(self):
+        name = self.__class__.__name__
+        return "<%r tag object %d>" % (name, id(self))
+
+
+Namespace = NamespaceMetaclass(
+    "Namespace",
+    (object,),
+    {
+        "__tagspec__": None,
+        "__tagclass__": Tag,
+        "__stickyname__": False,
+    },
+)
+
+
+class HtmlTag(Tag):
+    def unicode(self, indent=2):
+        l = []
+        HtmlVisitor(l.append, indent, shortempty=False).visit(self)
+        return u("").join(l)
+
+
+# exported plain html namespace
+
+
+class html(Namespace):
+    __tagclass__ = HtmlTag
+    __stickyname__ = True
+    __tagspec__ = dict(
+        [
+            (x, 1)
+            for x in (
+                "a,abbr,acronym,address,applet,area,b,bdo,big,blink,"
+                "blockquote,body,br,button,caption,center,cite,code,col,"
+                "colgroup,comment,dd,del,dfn,dir,div,dl,dt,em,embed,"
+                "fieldset,font,form,frameset,h1,h2,h3,h4,h5,h6,head,html,"
+                "i,iframe,img,input,ins,kbd,label,legend,li,link,listing,"
+                "map,marquee,menu,meta,multicol,nobr,noembed,noframes,"
+                "noscript,object,ol,optgroup,option,p,pre,q,s,script,"
+                "select,small,span,strike,strong,style,sub,sup,table,"
+                "tbody,td,textarea,tfoot,th,thead,title,tr,tt,u,ul,xmp,"
+                "base,basefont,frame,hr,isindex,param,samp,var"
+            ).split(",")
+            if x
+        ]
+    )
+
+    class Style(object):
+        def __init__(self, **kw):
+            for x, y in kw.items():
+                x = x.replace("_", "-")
+                setattr(self, x, y)
+
+
+class raw(object):
+    """just a box that can contain a unicode string that will be
+    included directly in the output"""
+
+    def __init__(self, uniobj):
+        self.uniobj = uniobj
+
+
+class SimpleUnicodeVisitor(object):
+    """recursive visitor to write unicode."""
+
+    def __init__(self, write, indent=0, curindent=0, shortempty=True):
+        self.write = write
+        self.cache = {}
+        self.visited = {}  # for detection of recursion
+        self.indent = indent
+        self.curindent = curindent
+        self.parents = []
+        self.shortempty = shortempty  # short empty tags or not
+
+    def visit(self, node):
+        """dispatcher on node's class/bases name."""
+        cls = node.__class__
+        try:
+            visitmethod = self.cache[cls]
+        except KeyError:
+            for subclass in cls.__mro__:
+                visitmethod = getattr(self, subclass.__name__, None)
+                if visitmethod is not None:
+                    break
+            else:
+                visitmethod = self.__object
+            self.cache[cls] = visitmethod
+        visitmethod(node)
+
+    # the default fallback handler is marked private
+    # to avoid clashes with the tag name object
+    def __object(self, obj):
+        # self.write(obj)
+        self.write(escape(unicode(obj)))
+
+    def raw(self, obj):
+        self.write(obj.uniobj)
+
+    def list(self, obj):
+        assert id(obj) not in self.visited
+        self.visited[id(obj)] = 1
+        for elem in obj:
+            self.visit(elem)
+
+    def Tag(self, tag):
+        assert id(tag) not in self.visited
+        try:
+            tag.parent = self.parents[-1]
+        except IndexError:
+            tag.parent = None
+        self.visited[id(tag)] = 1
+        tagname = getattr(tag, "xmlname", tag.__class__.__name__)
+        if self.curindent and not self._isinline(tagname):
+            self.write("\n" + u(" ") * self.curindent)
+        if tag:
+            self.curindent += self.indent
+            self.write(u("<%s%s>") % (tagname, self.attributes(tag)))
+            self.parents.append(tag)
+            for x in tag:
+                self.visit(x)
+            self.parents.pop()
+            self.write(u("</%s>") % tagname)
+            self.curindent -= self.indent
+        else:
+            nameattr = tagname + self.attributes(tag)
+            if self._issingleton(tagname):
+                self.write(u("<%s/>") % (nameattr,))
+            else:
+                self.write(u("<%s></%s>") % (nameattr, tagname))
+
+    def attributes(self, tag):
+        # serialize attributes
+        attrlist = dir(tag.attr)
+        attrlist.sort()
+        l = []
+        for name in attrlist:
+            res = self.repr_attribute(tag.attr, name)
+            if res is not None:
+                l.append(res)
+        l.extend(self.getstyle(tag))
+        return u("").join(l)
+
+    def repr_attribute(self, attrs, name):
+        if name[:2] != "__":
+            value = getattr(attrs, name)
+            if name.endswith("_"):
+                name = name[:-1]
+            if isinstance(value, raw):
+                insert = value.uniobj
+            else:
+                insert = escape(unicode(value))
+            return ' %s="%s"' % (name, insert)
+
+    def getstyle(self, tag):
+        """return attribute list suitable for styling."""
+        try:
+            styledict = tag.style.__dict__
+        except AttributeError:
+            return []
+        else:
+            stylelist = [x + ": " + y for x, y in styledict.items()]
+            return [u(' style="%s"') % u("; ").join(stylelist)]
+
+    def _issingleton(self, tagname):
+        """can (and will) be overridden in subclasses"""
+        return self.shortempty
+
+    def _isinline(self, tagname):
+        """can (and will) be overridden in subclasses"""
+        return False
+
+
+class HtmlVisitor(SimpleUnicodeVisitor):
+
+    single = dict(
+        [
+            (x, 1)
+            for x in ("br,img,area,param,col,hr,meta,link,base," "input,frame").split(
+                ","
+            )
+        ]
+    )
+    inline = dict(
+        [
+            (x, 1)
+            for x in (
+                "a abbr acronym b basefont bdo big br cite code dfn em font "
+                "i img input kbd label q s samp select small span strike "
+                "strong sub sup textarea tt u var".split(" ")
+            )
+        ]
+    )
+
+    def repr_attribute(self, attrs, name):
+        if name == "class_":
+            value = getattr(attrs, name)
+            if value is None:
+                return
+        return super(HtmlVisitor, self).repr_attribute(attrs, name)
+
+    def _issingleton(self, tagname):
+        return tagname in self.single
+
+    def _isinline(self, tagname):
+        return tagname in self.inline
+
+
+class _escape:
+    def __init__(self):
+        self.escape = {
+            u('"'): u("&quot;"),
+            u("<"): u("&lt;"),
+            u(">"): u("&gt;"),
+            u("&"): u("&amp;"),
+            u("'"): u("&apos;"),
+        }
+        self.charef_rex = re.compile(u("|").join(self.escape.keys()))
+
+    def _replacer(self, match):
+        return self.escape[match.group(0)]
+
+    def __call__(self, ustring):
+        """xml-escape the given unicode string."""
+        ustring = unicode(ustring)
+        return self.charef_rex.sub(self._replacer, ustring)
+
+
+escape = _escape()
diff --git a/testing/mozbase/mozlog/mozlog/formatters/machformatter.py b/testing/mozbase/mozlog/mozlog/formatters/machformatter.py
new file mode 100644
index 0000000000..e520eebbe6
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/formatters/machformatter.py
@@ -0,0 +1,651 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+import time
+from functools import reduce
+
+import six
+from mozterm import Terminal
+
+from ..handlers import SummaryHandler
+from . import base
+from .process import strstatus
+from .tbplformatter import TbplFormatter
+
+color_dict = {
+    "log_test_status_fail": "red",
+    "log_process_output": "blue",
+    "log_test_status_pass": "green",
+    "log_test_status_unexpected_fail": "red",
+    "log_test_status_known_intermittent": "yellow",
+    "time": "cyan",
+    "action": "yellow",
+    "pid": "cyan",
+    "heading": "bold_yellow",
+    "sub_heading": "yellow",
+    "error": "red",
+    "warning": "yellow",
+    "bold": "bold",
+    "grey": "grey",
+    "normal": "normal",
+    "bright_black": "bright_black",
+}
+
+DEFAULT = "\x1b(B\x1b[m"
+
+
+def format_seconds(total):
+    """Format number of seconds to MM:SS.DD form."""
+    minutes, seconds = divmod(total, 60)
+    return "%2d:%05.2f" % (minutes, seconds)
+
+
+class TerminalColors(object):
+    def __init__(self, term, color_dict):
+        for key, value in color_dict.items():
+            attribute = getattr(term, value)
+            # In Blessed, these attributes aren't always callable. We can assume
+            # that if they're not, they're just the raw ANSI Escape Sequences.
+            # This TerminalColors class is basically just a lookup table for
+            # what function to call to format/color an input string a certain way.
+            # So if the attribute above is a callable, we can just proceed, but
+            # if it's not, we need to create our own function that prepends the
+            # raw ANSI Escape Sequences to the input string, so that everything
+            # has the same behavior. We append DEFAULT to reset to no formatting
+            # at the end of our string, to prevent text that comes afterwards
+            # from inheriting the prepended formatting.
+            if not callable(attribute):
+
+                def apply_formatting(text):
+                    return attribute + text + DEFAULT
+
+                attribute = apply_formatting
+            setattr(self, key, attribute)
+
+
+class MachFormatter(base.BaseFormatter):
+    def __init__(
+        self,
+        start_time=None,
+        write_interval=False,
+        write_times=True,
+        terminal=None,
+        disable_colors=False,
+        summary_on_shutdown=False,
+        verbose=False,
+        enable_screenshot=False,
+        **kwargs
+    ):
+        super(MachFormatter, self).__init__(**kwargs)
+
+        if start_time is None:
+            start_time = time.time()
+        start_time = int(start_time * 1000)
+        self.start_time = start_time
+        self.write_interval = write_interval
+        self.write_times = write_times
+        self.status_buffer = {}
+        self.has_unexpected = {}
+        self.last_time = None
+        self.color_formatter = TerminalColors(
+            Terminal(disable_styling=disable_colors), color_dict
+        )
+        self.verbose = verbose
+        self._known_pids = set()
+        self.tbpl_formatter = None
+        self.enable_screenshot = enable_screenshot
+        self.summary = SummaryHandler()
+        self.summary_on_shutdown = summary_on_shutdown
+
+        message_handlers = {
+            "colors": {
+                "on": self._enable_colors,
+                "off": self._disable_colors,
+            },
+            "summary_on_shutdown": {
+                "on": self._enable_summary_on_shutdown,
+                "off": self._disable_summary_on_shutdown,
+            },
+        }
+
+        for topic, handlers in message_handlers.items():
+            self.message_handler.register_message_handlers(topic, handlers)
+
+    def __call__(self, data):
+        self.summary(data)
+
+        s = super(MachFormatter, self).__call__(data)
+        if s is None:
+            return
+
+        time = self.color_formatter.time(format_seconds(self._time(data)))
+        return "%s %s\n" % (time, s)
+
+    def _enable_colors(self):
+        self.disable_colors = False
+
+    def _disable_colors(self):
+        self.disable_colors = True
+
+    def _enable_summary_on_shutdown(self):
+        self.summary_on_shutdown = True
+
+    def _disable_summary_on_shutdown(self):
+        self.summary_on_shutdown = False
+
+    def _get_test_id(self, data):
+        test_id = data.get("test")
+        if isinstance(test_id, list):
+            test_id = tuple(test_id)
+        return test_id
+
+    def _get_file_name(self, test_id):
+        if isinstance(test_id, (str, six.text_type)):
+            return test_id
+
+        if isinstance(test_id, tuple):
+            return "".join(test_id)
+
+        assert False, "unexpected test_id"
+
+    def suite_start(self, data):
+        num_tests = reduce(lambda x, y: x + len(y), six.itervalues(data["tests"]), 0)
+        action = self.color_formatter.action(data["action"].upper())
+        name = ""
+        if "name" in data:
+            name = " %s -" % (data["name"],)
+        return "%s:%s running %i tests" % (action, name, num_tests)
+
+    def suite_end(self, data):
+        action = self.color_formatter.action(data["action"].upper())
+        rv = [action]
+        if not self.summary_on_shutdown:
+            rv.append(
+                self._format_suite_summary(
+                    self.summary.current_suite, self.summary.current
+                )
+            )
+        return "\n".join(rv)
+
+    def _format_expected(self, status, expected, known_intermittent=[]):
+        if status == expected:
+            color = self.color_formatter.log_test_status_pass
+            if expected not in ("PASS", "OK"):
+                color = self.color_formatter.log_test_status_fail
+                status = "EXPECTED-%s" % status
+        else:
+            if status in known_intermittent:
+                color = self.color_formatter.log_test_status_known_intermittent
+                status = "KNOWN-INTERMITTENT-%s" % status
+            else:
+                color = self.color_formatter.log_test_status_fail
+                if status in ("PASS", "OK"):
+                    status = "UNEXPECTED-%s" % status
+        return color(status)
+
+    def _format_status(self, test, data):
+        name = data.get("subtest", test)
+        rv = "%s %s" % (
+            self._format_expected(
+                data["status"],
+                data.get("expected", data["status"]),
+                data.get("known_intermittent", []),
+            ),
+            name,
+        )
+        if "message" in data:
+            rv += " - %s" % data["message"]
+        if "stack" in data:
+            rv += self._format_stack(data["stack"])
+        return rv
+
+    def _format_stack(self, stack):
+        return "\n%s\n" % self.color_formatter.bright_black(stack.strip("\n"))
+
+    def _format_suite_summary(self, suite, summary):
+        count = summary["counts"]
+        logs = summary["unexpected_logs"]
+        intermittent_logs = summary["intermittent_logs"]
+        harness_errors = summary["harness_errors"]
+
+        rv = [
+            "",
+            self.color_formatter.sub_heading(suite),
+            self.color_formatter.sub_heading("~" * len(suite)),
+        ]
+
+        # Format check counts
+        checks = self.summary.aggregate("count", count)
+        rv.append(
+            "Ran {} checks ({})".format(
+                sum(checks.values()),
+                ", ".join(
+                    ["{} {}s".format(v, k) for k, v in sorted(checks.items()) if v]
+                ),
+            )
+        )
+
+        # Format expected counts
+        checks = self.summary.aggregate("expected", count, include_skip=False)
+        intermittent_checks = self.summary.aggregate(
+            "known_intermittent", count, include_skip=False
+        )
+        intermittents = sum(intermittent_checks.values())
+        known = (
+            " ({} known intermittents)".format(intermittents) if intermittents else ""
+        )
+        rv.append("Expected results: {}{}".format(sum(checks.values()), known))
+
+        # Format skip counts
+        skip_tests = count["test"]["expected"]["skip"]
+        skip_subtests = count["subtest"]["expected"]["skip"]
+        if skip_tests:
+            skipped = "Skipped: {} tests".format(skip_tests)
+            if skip_subtests:
+                skipped = "{}, {} subtests".format(skipped, skip_subtests)
+            rv.append(skipped)
+
+        # Format unexpected counts
+        checks = self.summary.aggregate("unexpected", count)
+        unexpected_count = sum(checks.values())
+        rv.append("Unexpected results: {}".format(unexpected_count))
+        if unexpected_count:
+            for key in ("test", "subtest", "assert"):
+                if not count[key]["unexpected"]:
+                    continue
+                status_str = ", ".join(
+                    [
+                        "{} {}".format(n, s)
+                        for s, n in sorted(count[key]["unexpected"].items())
+                    ]
+                )
+                rv.append(
+                    "  {}: {} ({})".format(
+                        key, sum(count[key]["unexpected"].values()), status_str
+                    )
+                )
+
+        # Format intermittents
+        if intermittents > 0:
+            heading = "Known Intermittent Results"
+            rv.extend(
+                [
+                    "",
+                    self.color_formatter.heading(heading),
+                    self.color_formatter.heading("-" * len(heading)),
+                ]
+            )
+            if count["subtest"]["count"]:
+                for test_id, results in intermittent_logs.items():
+                    test = self._get_file_name(test_id)
+                    rv.append(self.color_formatter.bold(test))
+                    for data in results:
+                        rv.append("  %s" % self._format_status(test, data).rstrip())
+            else:
+                for test_id, results in intermittent_logs.items():
+                    test = self._get_file_name(test_id)
+                    for data in results:
+                        assert "subtest" not in data
+                        rv.append(self._format_status(test, data).rstrip())
+
+        # Format status
+        testfailed = any(
+            count[key]["unexpected"] for key in ("test", "subtest", "assert")
+        )
+        if not testfailed and not harness_errors:
+            rv.append(self.color_formatter.log_test_status_pass("OK"))
+        else:
+            # Format test failures
+            heading = "Unexpected Results"
+            rv.extend(
+                [
+                    "",
+                    self.color_formatter.heading(heading),
+                    self.color_formatter.heading("-" * len(heading)),
+                ]
+            )
+            if count["subtest"]["count"]:
+                for test_id, results in logs.items():
+                    test = self._get_file_name(test_id)
+                    rv.append(self.color_formatter.bold(test))
+                    for data in results:
+                        rv.append("  %s" % self._format_status(test, data).rstrip())
+            else:
+                for test_id, results in logs.items():
+                    test = self._get_file_name(test_id)
+                    for data in results:
+                        assert "subtest" not in data
+                        rv.append(self._format_status(test, data).rstrip())
+
+            # Format harness errors
+            if harness_errors:
+                for data in harness_errors:
+                    rv.append(self.log(data))
+
+        return "\n".join(rv)
+
+    def test_start(self, data):
+        action = self.color_formatter.action(data["action"].upper())
+        return "%s: %s" % (action, self._get_test_id(data))
+
+    def test_end(self, data):
+        subtests = self._get_subtest_data(data)
+
+        if "expected" in data and data["status"] not in data.get(
+            "known_intermittent", []
+        ):
+            parent_unexpected = True
+            expected_str = ", expected %s" % data["expected"]
+        else:
+            parent_unexpected = False
+            expected_str = ""
+
+        has_screenshots = "reftest_screenshots" in data.get("extra", {})
+
+        test = self._get_test_id(data)
+
+        # Reset the counts to 0
+        self.status_buffer[test] = {"count": 0, "unexpected": 0, "pass": 0}
+        self.has_unexpected[test] = bool(subtests["unexpected"])
+
+        if subtests["count"] != 0:
+            rv = "Test %s%s. Subtests passed %i/%i. Unexpected %s" % (
+                data["status"],
+                expected_str,
+                subtests["pass"],
+                subtests["count"],
+                subtests["unexpected"],
+            )
+        else:
+            rv = "%s%s" % (data["status"], expected_str)
+
+        unexpected = self.summary.current["unexpected_logs"].get(data["test"])
+        if unexpected:
+            if len(unexpected) == 1 and parent_unexpected:
+                message = unexpected[0].get("message", "")
+                if message:
+                    rv += " - %s" % message
+                if "stack" in data:
+                    rv += self._format_stack(data["stack"])
+            elif not self.verbose:
+                rv += "\n"
+                for d in unexpected:
+                    rv += self._format_status(data["test"], d)
+
+        intermittents = self.summary.current["intermittent_logs"].get(data["test"])
+        if intermittents:
+            rv += "\n"
+            for d in intermittents:
+                rv += self._format_status(data["test"], d)
+
+        if "expected" not in data and not bool(subtests["unexpected"]):
+            color = self.color_formatter.log_test_status_pass
+        else:
+            color = self.color_formatter.log_test_status_unexpected_fail
+
+        action = color(data["action"].upper())
+        rv = "%s: %s" % (action, rv)
+        if has_screenshots and self.enable_screenshot:
+            if self.tbpl_formatter is None:
+                self.tbpl_formatter = TbplFormatter()
+            # Create TBPL-like output that can be pasted into the reftest analyser
+            rv = "\n".join((rv, self.tbpl_formatter.test_end(data)))
+        return rv
+
+    def valgrind_error(self, data):
+        rv = " " + data["primary"] + "\n"
+        for line in data["secondary"]:
+            rv = rv + line + "\n"
+
+        return rv
+
+    def lsan_leak(self, data):
+        allowed = data.get("allowed_match")
+        if allowed:
+            prefix = self.color_formatter.log_test_status_fail("FAIL")
+        else:
+            prefix = self.color_formatter.log_test_status_unexpected_fail(
+                "UNEXPECTED-FAIL"
+            )
+
+        return "%s LeakSanitizer: leak at %s" % (prefix, ", ".join(data["frames"]))
+
+    def lsan_summary(self, data):
+        allowed = data.get("allowed", False)
+        if allowed:
+            prefix = self.color_formatter.warning("WARNING")
+        else:
+            prefix = self.color_formatter.error("ERROR")
+
+        return (
+            "%s | LeakSanitizer | "
+            "SUMMARY: AddressSanitizer: %d byte(s) leaked in %d allocation(s)."
+            % (prefix, data["bytes"], data["allocations"])
+        )
+
+    def mozleak_object(self, data):
+        data_log = data.copy()
+        data_log["level"] = "INFO"
+        data_log["message"] = "leakcheck: %s leaked %d %s" % (
+            data["process"],
+            data["bytes"],
+            data["name"],
+        )
+        return self.log(data_log)
+
+    def mozleak_total(self, data):
+        if data["bytes"] is None:
+            # We didn't see a line with name 'TOTAL'
+            if data.get("induced_crash", False):
+                data_log = data.copy()
+                data_log["level"] = "INFO"
+                data_log["message"] = (
+                    "leakcheck: %s deliberate crash and thus no leak log\n"
+                    % data["process"]
+                )
+                return self.log(data_log)
+            if data.get("ignore_missing", False):
+                return (
+                    "%s ignoring missing output line for total leaks\n"
+                    % data["process"]
+                )
+
+            status = self.color_formatter.log_test_status_pass("FAIL")
+            return "%s leakcheck: " "%s missing output line for total leaks!\n" % (
+                status,
+                data["process"],
+            )
+
+        if data["bytes"] == 0:
+            return "%s leakcheck: %s no leaks detected!\n" % (
+                self.color_formatter.log_test_status_pass("PASS"),
+                data["process"],
+            )
+
+        message = "leakcheck: %s %d bytes leaked\n" % (data["process"], data["bytes"])
+
+        # data["bytes"] will include any expected leaks, so it can be off
+        # by a few thousand bytes.
+        failure = data["bytes"] > data["threshold"]
+        status = (
+            self.color_formatter.log_test_status_unexpected_fail("UNEXPECTED-FAIL")
+            if failure
+            else self.color_formatter.log_test_status_fail("FAIL")
+        )
+        return "%s %s\n" % (status, message)
+
+    def test_status(self, data):
+        test = self._get_test_id(data)
+        if test not in self.status_buffer:
+            self.status_buffer[test] = {"count": 0, "unexpected": 0, "pass": 0}
+        self.status_buffer[test]["count"] += 1
+
+        if data["status"] == "PASS":
+            self.status_buffer[test]["pass"] += 1
+
+        if "expected" in data and data["status"] not in data.get(
+            "known_intermittent", []
+        ):
+            self.status_buffer[test]["unexpected"] += 1
+
+        if self.verbose:
+            return self._format_status(test, data).rstrip("\n")
+
+    def assertion_count(self, data):
+        if data["min_expected"] <= data["count"] <= data["max_expected"]:
+            return
+
+        if data["min_expected"] != data["max_expected"]:
+            expected = "%i to %i" % (data["min_expected"], data["max_expected"])
+        else:
+            expected = "%i" % data["min_expected"]
+
+        action = self.color_formatter.log_test_status_fail("ASSERT")
+        return "%s: Assertion count %i, expected %s assertions\n" % (
+            action,
+            data["count"],
+            expected,
+        )
+
+    def process_output(self, data):
+        rv = []
+
+        pid = data["process"]
+        if pid.isdigit():
+            pid = "pid:%s" % pid
+        pid = self.color_formatter.pid(pid)
+
+        if "command" in data and data["process"] not in self._known_pids:
+            self._known_pids.add(data["process"])
+            rv.append("%s Full command: %s" % (pid, data["command"]))
+
+        rv.append("%s %s" % (pid, data["data"]))
+        return "\n".join(rv)
+
+    def crash(self, data):
+        test = self._get_test_id(data)
+
+        if data.get("stackwalk_returncode", 0) != 0 and not data.get(
+            "stackwalk_stderr"
+        ):
+            success = True
+        else:
+            success = False
+
+        rv = [
+            "pid:%s. Test:%s. Minidump analysed:%s. Signature:[%s]"
+            % (data.get("pid", None), test, success, data["signature"])
+        ]
+
+        if data.get("java_stack"):
+            rv.append("Java exception: %s" % data["java_stack"])
+        else:
+            if data.get("reason"):
+                rv.append("Mozilla crash reason: %s" % data["reason"])
+
+            if data.get("minidump_path"):
+                rv.append("Crash dump filename: %s" % data["minidump_path"])
+
+            if data.get("stackwalk_returncode", 0) != 0:
+                rv.append(
+                    "minidump-stackwalk exited with return code %d"
+                    % data["stackwalk_returncode"]
+                )
+
+            if data.get("stackwalk_stderr"):
+                rv.append("stderr from minidump-stackwalk:")
+                rv.append(data["stackwalk_stderr"])
+            elif data.get("stackwalk_stdout"):
+                rv.append(data["stackwalk_stdout"])
+
+            if data.get("stackwalk_errors"):
+                rv.extend(data.get("stackwalk_errors"))
+
+        rv = "\n".join(rv)
+        if not rv[-1] == "\n":
+            rv += "\n"
+
+        action = self.color_formatter.action(data["action"].upper())
+        return "%s: %s" % (action, rv)
+
+    def process_start(self, data):
+        rv = "Started process `%s`" % data["process"]
+        desc = data.get("command")
+        if desc:
+            rv = "%s (%s)" % (rv, desc)
+        return rv
+
+    def process_exit(self, data):
+        return "%s: %s" % (data["process"], strstatus(data["exitcode"]))
+
+    def log(self, data):
+        level = data.get("level").upper()
+
+        if level in ("CRITICAL", "ERROR"):
+            level = self.color_formatter.error(level)
+        elif level == "WARNING":
+            level = self.color_formatter.warning(level)
+        elif level == "INFO":
+            level = self.color_formatter.log_process_output(level)
+
+        if data.get("component"):
+            rv = " ".join([data["component"], level, data["message"]])
+        else:
+            rv = "%s %s" % (level, data["message"])
+
+        if "stack" in data:
+            rv += "\n%s" % data["stack"]
+
+        return rv
+
+    def lint(self, data):
+        fmt = (
+            "{path}  {c1}{lineno}{column}  {c2}{level}{normal}  {message}"
+            "  {c1}{rule}({linter}){normal}"
+        )
+        message = fmt.format(
+            path=data["path"],
+            normal=self.color_formatter.normal,
+            c1=self.color_formatter.grey,
+            c2=self.color_formatter.error
+            if data["level"] == "error"
+            else (self.color_formatter.log_test_status_fail),
+            lineno=str(data["lineno"]),
+            column=(":" + str(data["column"])) if data.get("column") else "",
+            level=data["level"],
+            message=data["message"],
+            rule="{} ".format(data["rule"]) if data.get("rule") else "",
+            linter=data["linter"].lower() if data.get("linter") else "",
+        )
+
+        return message
+
+    def shutdown(self, data):
+        if not self.summary_on_shutdown:
+            return
+
+        heading = "Overall Summary"
+        rv = [
+            "",
+            self.color_formatter.heading(heading),
+            self.color_formatter.heading("=" * len(heading)),
+        ]
+        for suite, summary in self.summary:
+            rv.append(self._format_suite_summary(suite, summary))
+        return "\n".join(rv)
+
+    def _get_subtest_data(self, data):
+        test = self._get_test_id(data)
+        return self.status_buffer.get(test, {"count": 0, "unexpected": 0, "pass": 0})
+
+    def _time(self, data):
+        entry_time = data["time"]
+        if self.write_interval and self.last_time is not None:
+            t = entry_time - self.last_time
+            self.last_time = entry_time
+        else:
+            t = entry_time - self.start_time
+
+        return t / 1000.0
diff --git a/testing/mozbase/mozlog/mozlog/formatters/process.py b/testing/mozbase/mozlog/mozlog/formatters/process.py
new file mode 100644
index 0000000000..4b978acf56
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/formatters/process.py
@@ -0,0 +1,60 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+import signal
+
+from six.moves import range
+
+# a dict cache of signal number -> signal name
+_SIG_NAME = None
+
+
+def strsig(n):
+    """
+    Translate a process signal identifier to a human readable string.
+    """
+    global _SIG_NAME
+
+    if _SIG_NAME is None:
+        # cache signal names
+        _SIG_NAME = {}
+        for k in dir(signal):
+            if (
+                k.startswith("SIG")
+                and not k.startswith("SIG_")
+                and k != "SIGCLD"
+                and k != "SIGPOLL"
+            ):
+
+                _SIG_NAME[getattr(signal, k)] = k
+
+        # Realtime signals mostly have no names
+        if hasattr(signal, "SIGRTMIN") and hasattr(signal, "SIGRTMAX"):
+            for r in range(signal.SIGRTMIN + 1, signal.SIGRTMAX + 1):
+                _SIG_NAME[r] = "SIGRTMIN+" + str(r - signal.SIGRTMIN)
+
+    if n < 0 or n >= signal.NSIG:
+        return "out-of-range signal, number %s" % n
+    try:
+        return _SIG_NAME[n]
+    except KeyError:
+        return "unrecognized signal, number %s" % n
+
+
+def strstatus(status):
+    """
+    Returns a human readable string of a process exit code, as returned
+    by the subprocess module.
+    """
+    # 'status' is the exit status
+    if os.name != "posix":
+        # Windows error codes are easier to look up if printed in hexadecimal
+        if status < 0:
+            status += 2 ** 32
+        return "exit %x" % status
+    elif status >= 0:
+        return "exit %d" % status
+    else:
+        return "killed by %s" % strsig(-status)
diff --git a/testing/mozbase/mozlog/mozlog/formatters/tbplformatter.py b/testing/mozbase/mozlog/mozlog/formatters/tbplformatter.py
new file mode 100644
index 0000000000..70efc559f2
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/formatters/tbplformatter.py
@@ -0,0 +1,446 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import functools
+from collections import deque
+from functools import reduce
+
+import six
+
+from ..handlers import SummaryHandler
+from .base import BaseFormatter
+from .process import strstatus
+
+
+def output_subtests(func):
+    @functools.wraps(func)
+    def inner(self, data):
+        if self.subtests_count:
+            return self._format_subtests(data.get("component")) + func(self, data)
+        else:
+            return func(self, data)
+
+    return inner
+
+
+class TbplFormatter(BaseFormatter):
+    """Formatter that formats logs in the legacy formatting format used by TBPL
+    This is intended to be used to preserve backward compatibility with existing tools
+    hand-parsing this format.
+    """
+
+    def __init__(self, compact=False, summary_on_shutdown=False, **kwargs):
+        super(TbplFormatter, self).__init__(**kwargs)
+        self.suite_start_time = None
+        self.test_start_times = {}
+        self.buffer = None
+        self.compact = compact
+        self.subtests_count = 0
+
+        self.summary = SummaryHandler()
+        self.summary_on_shutdown = summary_on_shutdown
+
+    def __call__(self, data):
+        if self.summary_on_shutdown:
+            self.summary(data)
+        return super(TbplFormatter, self).__call__(data)
+
+    @property
+    def compact(self):
+        return self._compact
+
+    @compact.setter
+    def compact(self, value):
+        self._compact = value
+        if value:
+            self.buffer = deque([], 10)
+        else:
+            self.buffer = None
+
+    def _format_subtests(self, component, subtract_context=False):
+        count = self.subtests_count
+        if subtract_context:
+            count -= len(self.buffer)
+        self.subtests_count = 0
+        return self._log(
+            {"level": "INFO", "message": "." * count, "component": component}
+        )
+
+    @output_subtests
+    def log(self, data):
+        return self._log(data)
+
+    def _log(self, data):
+        if data.get("component"):
+            message = "%s %s" % (data["component"], data["message"])
+        else:
+            message = data["message"]
+
+        if "stack" in data:
+            message += "\n%s" % data["stack"]
+
+        return "%s\n" % message
+
+    @output_subtests
+    def process_output(self, data):
+        pid = data["process"]
+        if pid.isdigit():
+            pid = "PID %s" % pid
+        return "%s | %s\n" % (pid, data["data"])
+
+    @output_subtests
+    def process_start(self, data):
+        msg = "TEST-INFO | started process %s" % data["process"]
+        if "command" in data:
+            msg = "%s (%s)" % (msg, data["command"])
+        return msg + "\n"
+
+    @output_subtests
+    def process_exit(self, data):
+        return "TEST-INFO | %s: %s\n" % (data["process"], strstatus(data["exitcode"]))
+
+    @output_subtests
+    def crash(self, data):
+        id = data["test"] if "test" in data else "pid: %s" % data["process"]
+
+        if data.get("java_stack"):
+            # use "<exception> at <top frame>" as a crash signature for java exception
+            sig = data["java_stack"].split("\n")
+            sig = " ".join(sig[0:2])
+            rv = ["PROCESS-CRASH | %s | %s\n[%s]" % (id, sig, data["java_stack"])]
+
+            if data.get("reason"):
+                rv.append("Mozilla crash reason: %s" % data["reason"])
+
+            if data.get("minidump_path"):
+                rv.append("Crash dump filename: %s" % data["minidump_path"])
+
+        else:
+            signature = data["signature"] if data["signature"] else "unknown top frame"
+            reason = data.get("reason", "application crashed")
+            rv = ["PROCESS-CRASH | %s [%s] | %s " % (reason, signature, id)]
+
+            if data.get("reason"):
+                rv.append("Mozilla crash reason: %s" % data["reason"])
+
+            if data.get("minidump_path"):
+                rv.append("Crash dump filename: %s" % data["minidump_path"])
+
+            if data.get("stackwalk_stderr"):
+                rv.append("stderr from minidump-stackwalk:")
+                rv.append(data["stackwalk_stderr"])
+            elif data.get("stackwalk_stdout"):
+                rv.append(data["stackwalk_stdout"])
+
+            if data.get("stackwalk_returncode", 0) != 0:
+                rv.append(
+                    "minidump-stackwalk exited with return code %d"
+                    % data["stackwalk_returncode"]
+                )
+
+            if data.get("stackwalk_errors"):
+                rv.extend(data.get("stackwalk_errors"))
+
+        rv = "\n".join(rv)
+        if not rv[-1] == "\n":
+            rv += "\n"
+
+        return rv
+
+    def suite_start(self, data):
+        self.suite_start_time = data["time"]
+        num_tests = reduce(lambda x, y: x + len(y), six.itervalues(data["tests"]), 0)
+        return "SUITE-START | Running %i tests\n" % num_tests
+
+    def test_start(self, data):
+        self.test_start_times[self.test_id(data["test"])] = data["time"]
+
+        return "TEST-START | %s\n" % data["test"]
+
+    def test_status(self, data):
+        if self.compact:
+            if "expected" in data:
+                rv = []
+                rv.append(
+                    self._format_subtests(data.get("component"), subtract_context=True)
+                )
+                rv.extend(self._format_status(item) for item in self.buffer)
+                rv.append(self._format_status(data))
+                self.buffer.clear()
+                return "".join(rv)
+            else:
+                self.subtests_count += 1
+                self.buffer.append(data)
+        else:
+            return self._format_status(data)
+
+    def assertion_count(self, data):
+        if data["min_expected"] != data["max_expected"]:
+            expected = "%i to %i" % (data["min_expected"], data["max_expected"])
+        else:
+            expected = "%i" % data["min_expected"]
+
+        if data["count"] < data["min_expected"]:
+            status, comparison = "TEST-UNEXPECTED-PASS", "is less than"
+        elif data["count"] > data["max_expected"]:
+            status, comparison = "TEST-UNEXPECTED-FAIL", "is more than"
+        elif data["count"] > 0:
+            status, comparison = "TEST-KNOWN-FAIL", "matches"
+        else:
+            return
+
+        return "%s | %s | assertion count %i %s expected %s assertions\n" % (
+            status,
+            data["test"],
+            data["count"],
+            comparison,
+            expected,
+        )
+
+    def _format_status(self, data):
+        message = "- " + data["message"] if "message" in data else ""
+        if "stack" in data:
+            message += "\n%s" % data["stack"]
+        if message and message[-1] == "\n":
+            message = message[:-1]
+
+        status = data["status"]
+
+        if "expected" in data:
+            if status in data.get("known_intermittent", []):
+                status = "KNOWN-INTERMITTENT-%s" % status
+            else:
+                if not message:
+                    message = "- expected %s" % data["expected"]
+                failure_line = "TEST-UNEXPECTED-%s | %s | %s %s\n" % (
+                    status,
+                    data["test"],
+                    data["subtest"],
+                    message,
+                )
+                if data["expected"] != "PASS":
+                    info_line = "TEST-INFO | expected %s\n" % data["expected"]
+                    return failure_line + info_line
+                return failure_line
+
+        return "TEST-%s | %s | %s %s\n" % (
+            status,
+            data["test"],
+            data["subtest"],
+            message,
+        )
+
+    def test_end(self, data):
+        rv = []
+        if self.compact and self.subtests_count:
+            print_context = "expected" in data
+            rv.append(
+                self._format_subtests(
+                    data.get("component"), subtract_context=print_context
+                )
+            )
+            if print_context:
+                rv.extend(self._format_status(item) for item in self.buffer)
+            self.buffer.clear()
+
+        test_id = self.test_id(data["test"])
+        duration_msg = ""
+
+        if test_id in self.test_start_times:
+            start_time = self.test_start_times.pop(test_id)
+            time = data["time"] - start_time
+            duration_msg = "took %ims" % time
+
+        screenshot_msg = ""
+        extra = data.get("extra", {})
+        if "reftest_screenshots" in extra:
+            screenshots = extra["reftest_screenshots"]
+            if len(screenshots) == 3:
+                screenshot_msg = (
+                    "\nREFTEST   IMAGE 1 (TEST): data:image/png;base64,%s\n"
+                    "REFTEST   IMAGE 2 (REFERENCE): data:image/png;base64,%s"
+                ) % (screenshots[0]["screenshot"], screenshots[2]["screenshot"])
+            elif len(screenshots) == 1:
+                screenshot_msg = (
+                    "\nREFTEST   IMAGE: data:image/png;base64,%s"
+                    % screenshots[0]["screenshot"]
+                )
+
+        status = data["status"]
+
+        if "expected" in data:
+            if status in data.get("known_intermittent", []):
+                status = "KNOWN-INTERMITTENT-%s" % status
+            else:
+                message = data.get("message", "")
+                if not message:
+                    message = "expected %s" % data["expected"]
+                if "stack" in data:
+                    message += "\n%s" % data["stack"]
+                if message and message[-1] == "\n":
+                    message = message[:-1]
+
+                message += screenshot_msg
+
+                failure_line = "TEST-UNEXPECTED-%s | %s | %s\n" % (
+                    data["status"],
+                    test_id,
+                    message,
+                )
+
+                if data["expected"] not in ("PASS", "OK"):
+                    expected_msg = "expected %s | " % data["expected"]
+                else:
+                    expected_msg = ""
+                info_line = "TEST-INFO %s%s\n" % (expected_msg, duration_msg)
+
+                return failure_line + info_line
+
+        sections = ["TEST-%s" % status, test_id]
+        if duration_msg:
+            sections.append(duration_msg)
+        rv.append(" | ".join(sections) + "\n")
+        if screenshot_msg:
+            rv.append(screenshot_msg[1:] + "\n")
+        return "".join(rv)
+
+    def suite_end(self, data):
+        start_time = self.suite_start_time
+        # pylint --py3k W1619
+        time = int((data["time"] - start_time) / 1000)
+
+        return "SUITE-END | took %is\n" % time
+
+    def test_id(self, test_id):
+        if isinstance(test_id, (str, six.text_type)):
+            return test_id
+        else:
+            return tuple(test_id)
+
+    @output_subtests
+    def valgrind_error(self, data):
+        rv = "TEST-UNEXPECTED-VALGRIND-ERROR | " + data["primary"] + "\n"
+        for line in data["secondary"]:
+            rv = rv + line + "\n"
+
+        return rv
+
+    def lint(self, data):
+        fmt = "TEST-UNEXPECTED-{level} | {path}:{lineno}{column} | {message} ({rule})"
+        data["column"] = ":%s" % data["column"] if data["column"] else ""
+        data["rule"] = data["rule"] or data["linter"] or ""
+        return fmt.append(fmt.format(**data))
+
+    def lsan_leak(self, data):
+        frames = data.get("frames")
+        allowed_match = data.get("allowed_match")
+        frame_list = ", ".join(frames)
+        prefix = "TEST-UNEXPECTED-FAIL" if not allowed_match else "TEST-FAIL"
+        suffix = (
+            ""
+            if not allowed_match
+            else "INFO | LeakSanitizer | Frame %s matched a expected leak\n"
+            % allowed_match
+        )
+        return "%s | LeakSanitizer | leak at %s\n%s" % (prefix, frame_list, suffix)
+
+    def lsan_summary(self, data):
+        level = "INFO" if data.get("allowed", False) else "ERROR"
+        return (
+            "%s | LeakSanitizer | "
+            "SUMMARY: AddressSanitizer: %d byte(s) leaked in %d allocation(s)."
+            % (level, data["bytes"], data["allocations"])
+        )
+
+    def mozleak_object(self, data):
+        return "TEST-INFO | leakcheck | %s leaked %d %s\n" % (
+            data["process"],
+            data["bytes"],
+            data["name"],
+        )
+
+    def mozleak_total(self, data):
+        if data["bytes"] is None:
+            # We didn't see a line with name 'TOTAL'
+            if data.get("induced_crash", False):
+                return (
+                    "TEST-INFO | leakcheck | %s deliberate crash and thus no leak log\n"
+                    % data["process"]
+                )
+            if data.get("ignore_missing", False):
+                return (
+                    "TEST-INFO | leakcheck | "
+                    "%s ignoring missing output line for total leaks\n"
+                    % data["process"]
+                )
+
+            return (
+                "TEST-UNEXPECTED-FAIL | leakcheck | "
+                "%s missing output line for total leaks!\n" % data["process"]
+            )
+
+        if data["bytes"] == 0:
+            return "TEST-PASS | leakcheck | %s no leaks detected!\n" % data["process"]
+
+        # Create a comma delimited string of the first N leaked objects found,
+        # to aid with bug summary matching in TBPL. Note: The order of the objects
+        # had no significance (they're sorted alphabetically).
+        max_objects = 5
+        object_summary = ", ".join(data["objects"][:max_objects])
+        if len(data["objects"]) > max_objects:
+            object_summary += ", ..."
+
+        message = "leakcheck | %s %d bytes leaked (%s)\n" % (
+            data["process"],
+            data["bytes"],
+            object_summary,
+        )
+
+        # data["bytes"] will include any expected leaks, so it can be off
+        # by a few thousand bytes.
+        if data["bytes"] > data["threshold"]:
+            return "TEST-UNEXPECTED-FAIL | %s\n" % message
+        else:
+            return "WARNING | %s\n" % message
+
+    def _format_suite_summary(self, suite, summary):
+        counts = summary["counts"]
+        logs = summary["unexpected_logs"]
+        intermittent_logs = summary["intermittent_logs"]
+
+        total = sum(self.summary.aggregate("count", counts).values())
+        expected = sum(self.summary.aggregate("expected", counts).values())
+        intermittents = sum(
+            self.summary.aggregate("known_intermittent", counts).values()
+        )
+        known = (
+            " ({} known intermittent tests)".format(intermittents)
+            if intermittents
+            else ""
+        )
+        status_str = "{}/{}{}".format(expected, total, known)
+        rv = ["{}: {}".format(suite, status_str)]
+
+        for results in logs.values():
+            for data in results:
+                rv.append("  {}".format(self._format_status(data)))
+
+        if intermittent_logs:
+            rv.append("Known Intermittent tests:")
+            for results in intermittent_logs.values():
+                for data in results:
+                    data["subtest"] = data.get("subtest", "")
+                    rv.append("  {}".format(self._format_status(data)))
+
+        return "\n".join(rv)
+
+    def shutdown(self, data):
+        if not self.summary_on_shutdown:
+            return
+
+        rv = ["", "Overall Summary"]
+        for suite, summary in self.summary:
+            rv.append(self._format_suite_summary(suite, summary))
+        rv.append("")
+        return "\n".join(rv)
diff --git a/testing/mozbase/mozlog/mozlog/formatters/unittest.py b/testing/mozbase/mozlog/mozlog/formatters/unittest.py
new file mode 100755
index 0000000000..3eba864d85
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/formatters/unittest.py
@@ -0,0 +1,83 @@
+#!/usr/bin/env python
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+from . import base
+
+
+class UnittestFormatter(base.BaseFormatter):
+    """Formatter designed to produce output in a format like that used by
+    the ``unittest`` module in the standard library."""
+
+    def __init__(self):
+        self.fails = []
+        self.errors = []
+        self.tests_run = 0
+        self.start_time = None
+        self.end_time = None
+
+    def suite_start(self, data):
+        self.start_time = data["time"]
+
+    def test_start(self, data):
+        self.tests_run += 1
+
+    def test_end(self, data):
+        char = "."
+        if "expected" in data:
+            status = data["status"]
+            char = {"FAIL": "F", "PRECONDITION_FAILED": "F", "ERROR": "E", "PASS": "X"}[
+                status
+            ]
+
+            if status == "FAIL" or status == "PRECONDITION_FAILED":
+                self.fails.append(data)
+            elif status == "ERROR":
+                self.errors.append(data)
+
+        elif data["status"] == "SKIP":
+            char = "S"
+        return char
+
+    def assertion_count(self, data):
+        if data["count"] < data["min_expected"]:
+            char = "X"
+        elif data["count"] > data["max_expected"]:
+            char = "F"
+            self.fails.append(
+                {
+                    "test": data["test"],
+                    "message": (
+                        "assertion count %i is greated than %i"
+                        % (data["count"], data["max_expected"])
+                    ),
+                }
+            )
+        elif data["count"] > 0:
+            char = "."
+        else:
+            char = "."
+
+        return char
+
+    def suite_end(self, data):
+        self.end_time = data["time"]
+        summary = "\n".join(
+            [self.output_fails(), self.output_errors(), self.output_summary()]
+        )
+        return "\n%s\n" % summary
+
+    def output_fails(self):
+        return "\n".join("FAIL %(test)s\n%(message)s\n" % data for data in self.fails)
+
+    def output_errors(self):
+        return "\n".join("ERROR %(test)s\n%(message)s" % data for data in self.errors)
+
+    def output_summary(self):
+        # pylint --py3k W1619
+        return "Ran %i tests in %.1fs" % (
+            self.tests_run,
+            (self.end_time - self.start_time) / 1000,
+        )
diff --git a/testing/mozbase/mozlog/mozlog/formatters/xunit.py b/testing/mozbase/mozlog/mozlog/formatters/xunit.py
new file mode 100644
index 0000000000..02966d713a
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/formatters/xunit.py
@@ -0,0 +1,115 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from xml.etree import ElementTree
+
+import six
+
+from . import base
+
+
+def format_test_id(test_id):
+    """Take a test id and return something that looks a bit like
+    a class path"""
+    if not isinstance(test_id, six.string_types):
+        # Not sure how to deal with reftests yet
+        raise NotImplementedError
+
+    # Turn a path into something like a class heirachy
+    return test_id.replace(".", "_").replace("/", ".")
+
+
+class XUnitFormatter(base.BaseFormatter):
+    """Formatter that produces XUnit-style XML output.
+
+    The tree is created in-memory so this formatter may be problematic
+    with very large log files.
+
+    Note that the data model isn't a perfect match. In
+    particular XUnit assumes that each test has a unittest-style
+    class name and function name, which isn't the case for us. The
+    implementation currently replaces path names with something that
+    looks like class names, but this doesn't work for test types that
+    actually produce class names, or for test types that have multiple
+    components in their test id (e.g. reftests)."""
+
+    def __init__(self):
+        self.tree = ElementTree.ElementTree()
+        self.root = None
+        self.suite_start_time = None
+        self.test_start_time = None
+
+        self.tests_run = 0
+        self.errors = 0
+        self.failures = 0
+        self.skips = 0
+
+    def suite_start(self, data):
+        self.root = ElementTree.Element("testsuite")
+        self.tree.root = self.root
+        self.suite_start_time = data["time"]
+
+    def test_start(self, data):
+        self.tests_run += 1
+        self.test_start_time = data["time"]
+
+    def _create_result(self, data):
+        test = ElementTree.SubElement(self.root, "testcase")
+        name = format_test_id(data["test"])
+        extra = data.get("extra") or {}
+        test.attrib["classname"] = extra.get("class_name") or name
+
+        if "subtest" in data:
+            test.attrib["name"] = data["subtest"]
+            # We generally don't know how long subtests take
+            test.attrib["time"] = "0"
+        else:
+            if "." in name:
+                test_name = name.rsplit(".", 1)[1]
+            else:
+                test_name = name
+            test.attrib["name"] = extra.get("method_name") or test_name
+            test.attrib["time"] = "%.2f" % (
+                (data["time"] - self.test_start_time) / 1000.0
+            )
+
+        if "expected" in data and data["expected"] != data["status"]:
+            if data["status"] in ("NOTRUN", "ASSERT", "ERROR"):
+                result = ElementTree.SubElement(test, "error")
+                self.errors += 1
+            else:
+                result = ElementTree.SubElement(test, "failure")
+                self.failures += 1
+
+            result.attrib["message"] = "Expected %s, got %s" % (
+                data["expected"],
+                data["status"],
+            )
+            result.text = "%s\n%s" % (data.get("stack", ""), data.get("message", ""))
+
+        elif data["status"] == "SKIP":
+            result = ElementTree.SubElement(test, "skipped")
+            self.skips += 1
+
+    def test_status(self, data):
+        self._create_result(data)
+
+    def test_end(self, data):
+        self._create_result(data)
+
+    def suite_end(self, data):
+        self.root.attrib.update(
+            {
+                "tests": str(self.tests_run),
+                "errors": str(self.errors),
+                "failures": str(self.failures),
+                "skips": str(self.skips),
+                "time": "%.2f" % ((data["time"] - self.suite_start_time) / 1000.0),
+            }
+        )
+        xml_string = ElementTree.tostring(self.root, encoding="utf8")
+        # pretty printing can not be done from xml.etree
+        from xml.dom import minidom
+
+        return minidom.parseString(xml_string).toprettyxml()
diff --git a/testing/mozbase/mozlog/mozlog/handlers/__init__.py b/testing/mozbase/mozlog/mozlog/handlers/__init__.py
new file mode 100644
index 0000000000..e14bdf675f
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/handlers/__init__.py
@@ -0,0 +1,19 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from .base import BaseHandler, LogLevelFilter, StreamHandler
+from .bufferhandler import BufferHandler
+from .statushandler import StatusHandler
+from .summaryhandler import SummaryHandler
+from .valgrindhandler import ValgrindHandler
+
+__all__ = [
+    "LogLevelFilter",
+    "StreamHandler",
+    "BaseHandler",
+    "StatusHandler",
+    "SummaryHandler",
+    "BufferHandler",
+    "ValgrindHandler",
+]
diff --git a/testing/mozbase/mozlog/mozlog/handlers/base.py b/testing/mozbase/mozlog/mozlog/handlers/base.py
new file mode 100644
index 0000000000..59fc05cc1f
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/handlers/base.py
@@ -0,0 +1,124 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+import codecs
+import locale
+from threading import Lock
+
+import six
+
+from mozlog.handlers.messagehandler import MessageHandler
+from mozlog.structuredlog import log_levels
+
+
+class BaseHandler(object):
+    """A base handler providing message handling facilities to
+    derived classes.
+    """
+
+    def __init__(self, inner):
+        self.message_handler = MessageHandler()
+        if hasattr(inner, "message_handler"):
+            self.message_handler.wrapped.append(inner)
+
+
+class LogLevelFilter(BaseHandler):
+    """Handler that filters out messages with action of log and a level
+    lower than some specified level.
+
+    :param inner: Handler to use for messages that pass this filter
+    :param level: Minimum log level to process
+    """
+
+    def __init__(self, inner, level):
+        BaseHandler.__init__(self, inner)
+        self.inner = inner
+        self.level = log_levels[level.upper()]
+
+    def __call__(self, item):
+        if item["action"] != "log" or log_levels[item["level"].upper()] <= self.level:
+            return self.inner(item)
+
+
+class StreamHandler(BaseHandler):
+    """Handler for writing to a file-like object
+
+    :param stream: File-like object to write log messages to
+    :param formatter: formatter to convert messages to string format
+    """
+
+    _lock = Lock()
+
+    def __init__(self, stream, formatter):
+        BaseHandler.__init__(self, formatter)
+        assert stream is not None
+        if six.PY2:
+            # This is a hack to deal with the case where we are passed a
+            # StreamWriter (e.g. by mach for stdout). A StreamWriter requires
+            # the code to handle unicode in exactly the opposite way compared
+            # to a normal stream i.e. you always have to pass in a Unicode
+            # object rather than a string object. Cope with that by extracting
+            # the underlying raw stream.
+            if isinstance(stream, codecs.StreamWriter):
+                stream = stream.stream
+
+        self.formatter = formatter
+        self.stream = stream
+
+    def __call__(self, data):
+        """Write a log message.
+
+        :param data: Structured log message dictionary."""
+        formatted = self.formatter(data)
+        if not formatted:
+            return
+        with self._lock:
+            if six.PY3:
+                import io
+
+                import mozfile
+
+                source_enc = "utf-8"
+                target_enc = "utf-8"
+                if isinstance(self.stream, io.BytesIO):
+                    target_enc = None
+                    if hasattr(self.stream, "encoding"):
+                        target_enc = self.stream.encoding
+                if target_enc is None:
+                    target_enc = locale.getpreferredencoding()
+
+                if isinstance(self.stream, io.StringIO) and isinstance(
+                    formatted, bytes
+                ):
+                    formatted = formatted.decode(source_enc, "replace")
+                elif (
+                    isinstance(self.stream, io.BytesIO)
+                    or isinstance(self.stream, mozfile.NamedTemporaryFile)
+                ) and isinstance(formatted, str):
+                    formatted = formatted.encode(target_enc, "replace")
+                elif isinstance(formatted, str):
+                    # Suppress eventual surrogates, but keep as string.
+                    # TODO: It is yet unclear how we can end up with
+                    # surrogates here, see comment on patch on bug 1794401.
+                    formatted_bin = formatted.encode(target_enc, "replace")
+                    formatted = formatted_bin.decode(target_enc, "ignore")
+
+                # It seems that under Windows we can have cp1252 encoding
+                # for the output stream and that not all unicode chars map
+                # well. We just ignore those errors here (they have no
+                # consequences for the executed tests, anyways).
+                try:
+                    self.stream.write(formatted)
+                except (UnicodeEncodeError):
+                    return
+            else:
+                if isinstance(formatted, six.text_type):
+                    self.stream.write(formatted.encode("utf-8", "replace"))
+                elif isinstance(formatted, str):
+                    self.stream.write(formatted)
+                else:
+                    assert False, "Got output from the formatter of an unexpected type"
+
+            self.stream.flush()
diff --git a/testing/mozbase/mozlog/mozlog/handlers/bufferhandler.py b/testing/mozbase/mozlog/mozlog/handlers/bufferhandler.py
new file mode 100644
index 0000000000..5fcdcf967a
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/handlers/bufferhandler.py
@@ -0,0 +1,86 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from .base import BaseHandler
+
+
+class BufferHandler(BaseHandler):
+    """Handler that maintains a circular buffer of messages based on the
+    size and actions specified by a user.
+
+    :param inner: The underlying handler used to emit messages.
+    :param message_limit: The maximum number of messages to retain for
+                          context. If None, the buffer will grow without limit.
+    :param buffered_actions: The set of actions to include in the buffer
+                             rather than log directly.
+    """
+
+    def __init__(self, inner, message_limit=100, buffered_actions=None):
+        BaseHandler.__init__(self, inner)
+        self.inner = inner
+        self.message_limit = message_limit
+        if buffered_actions is None:
+            buffered_actions = ["log", "test_status"]
+        self.buffered_actions = set(buffered_actions)
+        self._buffering = True
+
+        if self.message_limit is not None:
+            self._buffer = [None] * self.message_limit
+            self._buffer_pos = 0
+        else:
+            self._buffer = []
+
+        self.message_handler.register_message_handlers(
+            "buffer",
+            {
+                "on": self._enable_buffering,
+                "off": self._disable_buffering,
+                "flush": self._flush_buffered,
+                "clear": self._clear_buffer,
+            },
+        )
+
+    def __call__(self, data):
+        action = data["action"]
+        if "bypass_mozlog_buffer" in data:
+            data.pop("bypass_mozlog_buffer")
+            self.inner(data)
+            return
+        if not self._buffering or action not in self.buffered_actions:
+            self.inner(data)
+            return
+
+        self._add_message(data)
+
+    def _add_message(self, data):
+        if self.message_limit is None:
+            self._buffer.append(data)
+        else:
+            self._buffer[self._buffer_pos] = data
+            self._buffer_pos = (self._buffer_pos + 1) % self.message_limit
+
+    def _enable_buffering(self):
+        self._buffering = True
+
+    def _disable_buffering(self):
+        self._buffering = False
+
+    def _clear_buffer(self):
+        """Clear the buffer of unwanted messages."""
+        current_size = len([m for m in self._buffer if m is not None])
+        if self.message_limit is not None:
+            self._buffer = [None] * self.message_limit
+        else:
+            self._buffer = []
+        return current_size
+
+    def _flush_buffered(self):
+        """Logs the contents of the current buffer"""
+        for msg in self._buffer[self._buffer_pos :]:
+            if msg is not None:
+                self.inner(msg)
+        for msg in self._buffer[: self._buffer_pos]:
+            if msg is not None:
+                self.inner(msg)
+        return self._clear_buffer()
diff --git a/testing/mozbase/mozlog/mozlog/handlers/messagehandler.py b/testing/mozbase/mozlog/mozlog/handlers/messagehandler.py
new file mode 100644
index 0000000000..606dd83926
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/handlers/messagehandler.py
@@ -0,0 +1,39 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+class MessageHandler(object):
+    """A message handler providing message handling facilities to
+    classes derived from BaseHandler and BaseFormatter. This is a
+    composition class, to ensure handlers and formatters remain separate.
+
+    :param inner: A handler-like callable that may receive messages
+                  from a log user.
+    """
+
+    def __init__(self):
+        self.message_handlers = {}
+        self.wrapped = []
+
+    def register_message_handlers(self, topic, handlers):
+        self.message_handlers[topic] = handlers
+
+    def handle_message(self, topic, cmd, *args):
+        """Handles a message for the given topic by calling a subclass-defined
+        callback for the command.
+
+        :param topic: The topic of the broadcasted message. Handlers opt-in to
+                      receiving messages by identifying a topic when calling
+                      register_message_handlers.
+        :param command: The command to issue. This is a string that corresponds
+                        to a callback provided by the target.
+        :param arg: Arguments to pass to the identified message callback, if any.
+        """
+        rv = []
+        if topic in self.message_handlers and cmd in self.message_handlers[topic]:
+            rv.append(self.message_handlers[topic][cmd](*args))
+        if self.wrapped:
+            for inner in self.wrapped:
+                rv.extend(inner.handle_message(topic, cmd, *args))
+        return rv
diff --git a/testing/mozbase/mozlog/mozlog/handlers/statushandler.py b/testing/mozbase/mozlog/mozlog/handlers/statushandler.py
new file mode 100644
index 0000000000..500f2e1d89
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/handlers/statushandler.py
@@ -0,0 +1,87 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from collections import defaultdict, namedtuple
+
+RunSummary = namedtuple(
+    "RunSummary",
+    (
+        "unexpected_statuses",
+        "expected_statuses",
+        "known_intermittent_statuses",
+        "log_level_counts",
+        "action_counts",
+    ),
+)
+
+
+class StatusHandler(object):
+    """A handler used to determine an overall status for a test run according
+    to a sequence of log messages."""
+
+    def __init__(self):
+        # The count of each type of unexpected result status (includes tests and subtests)
+        self.unexpected_statuses = defaultdict(int)
+        # The count of each type of expected result status (includes tests and subtests)
+        self.expected_statuses = defaultdict(int)
+        # The count of known intermittent result statuses (includes tests and subtests)
+        self.known_intermittent_statuses = defaultdict(int)
+        # The count of actions logged
+        self.action_counts = defaultdict(int)
+        # The count of messages logged at each log level
+        self.log_level_counts = defaultdict(int)
+        # The count of "No tests run" error messages seen
+        self.no_tests_run_count = 0
+
+    def __call__(self, data):
+        action = data["action"]
+        known_intermittent = data.get("known_intermittent", [])
+        self.action_counts[action] += 1
+
+        if action == "log":
+            if data["level"] == "ERROR" and data["message"] == "No tests ran":
+                self.no_tests_run_count += 1
+            self.log_level_counts[data["level"]] += 1
+
+        if action in ("test_status", "test_end"):
+            status = data["status"]
+            # Don't count known_intermittent status as unexpected
+            if "expected" in data and status not in known_intermittent:
+                self.unexpected_statuses[status] += 1
+            else:
+                self.expected_statuses[status] += 1
+                # Count known_intermittent as expected and intermittent.
+                if status in known_intermittent:
+                    self.known_intermittent_statuses[status] += 1
+
+        if action == "assertion_count":
+            if data["count"] < data["min_expected"]:
+                self.unexpected_statuses["PASS"] += 1
+            elif data["count"] > data["max_expected"]:
+                self.unexpected_statuses["FAIL"] += 1
+            elif data["count"]:
+                self.expected_statuses["FAIL"] += 1
+            else:
+                self.expected_statuses["PASS"] += 1
+
+        if action == "lsan_leak":
+            if not data.get("allowed_match"):
+                self.unexpected_statuses["FAIL"] += 1
+
+        if action == "lsan_summary":
+            if not data.get("allowed", False):
+                self.unexpected_statuses["FAIL"] += 1
+
+        if action == "mozleak_total":
+            if data["bytes"] is not None and data["bytes"] > data.get("threshold", 0):
+                self.unexpected_statuses["FAIL"] += 1
+
+    def summarize(self):
+        return RunSummary(
+            dict(self.unexpected_statuses),
+            dict(self.expected_statuses),
+            dict(self.known_intermittent_statuses),
+            dict(self.log_level_counts),
+            dict(self.action_counts),
+        )
diff --git a/testing/mozbase/mozlog/mozlog/handlers/summaryhandler.py b/testing/mozbase/mozlog/mozlog/handlers/summaryhandler.py
new file mode 100644
index 0000000000..347e52abdb
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/handlers/summaryhandler.py
@@ -0,0 +1,193 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from collections import OrderedDict, defaultdict
+
+import six
+
+from ..reader import LogHandler
+
+
+class SummaryHandler(LogHandler):
+    """Handler class for storing suite summary information.
+
+    Can handle multiple suites in a single run. Summary
+    information is stored on the self.summary instance variable.
+
+    Per suite summary information can be obtained by calling 'get'
+    or iterating over this class.
+    """
+
+    def __init__(self, **kwargs):
+        super(SummaryHandler, self).__init__(**kwargs)
+
+        self.summary = OrderedDict()
+        self.current_suite = None
+
+    @property
+    def current(self):
+        return self.summary.get(self.current_suite)
+
+    def __getitem__(self, suite):
+        """Return summary information for the given suite.
+
+        The summary is of the form:
+
+            {
+              'counts': {
+                '<check>': {
+                  'count': int,
+                  'expected': {
+                    '<status>': int,
+                  },
+                  'unexpected': {
+                    '<status>': int,
+                  },
+                  'known_intermittent': {
+                    '<status>': int,
+                  },
+                },
+              },
+              'unexpected_logs': {
+                '<test>': [<data>]
+              },
+              'intermittent_logs': {
+                '<test>': [<data>]
+              }
+            }
+
+        Valid values for <check> are `test`, `subtest` and `assert`. Valid
+        <status> keys are defined in the :py:mod:`mozlog.logtypes` module.  The
+        <test> key is the id as logged by `test_start`. Finally the <data>
+        field is the log data from any `test_end` or `test_status` log messages
+        that have an unexpected result.
+
+        Mozlog's structuredlog has a `known_intermittent` field indicating if a
+        `test` and `subtest` <status> are expected to arise intermittently.
+        Known intermittent results are logged as both as `expected` and
+        `known_intermittent`.
+        """
+        return self.summary[suite]
+
+    def __iter__(self):
+        """Iterate over summaries.
+
+        Yields a tuple of (suite, summary). The summary returned is
+        the same format as returned by 'get'.
+        """
+        for suite, data in six.iteritems(self.summary):
+            yield suite, data
+
+    @classmethod
+    def aggregate(cls, key, counts, include_skip=True):
+        """Helper method for aggregating count data by 'key' instead of by 'check'."""
+        assert key in ("count", "expected", "unexpected", "known_intermittent")
+
+        res = defaultdict(int)
+        for check, val in counts.items():
+            if key == "count":
+                res[check] += val[key]
+                continue
+
+            for status, num in val[key].items():
+                if not include_skip and status == "skip":
+                    continue
+                res[check] += num
+        return res
+
+    def suite_start(self, data):
+        self.current_suite = data.get("name", "suite {}".format(len(self.summary) + 1))
+        if self.current_suite not in self.summary:
+            self.summary[self.current_suite] = {
+                "counts": {
+                    "test": {
+                        "count": 0,
+                        "expected": defaultdict(int),
+                        "unexpected": defaultdict(int),
+                        "known_intermittent": defaultdict(int),
+                    },
+                    "subtest": {
+                        "count": 0,
+                        "expected": defaultdict(int),
+                        "unexpected": defaultdict(int),
+                        "known_intermittent": defaultdict(int),
+                    },
+                    "assert": {
+                        "count": 0,
+                        "expected": defaultdict(int),
+                        "unexpected": defaultdict(int),
+                        "known_intermittent": defaultdict(int),
+                    },
+                },
+                "unexpected_logs": OrderedDict(),
+                "intermittent_logs": OrderedDict(),
+                "harness_errors": [],
+            }
+
+    def test_start(self, data):
+        self.current["counts"]["test"]["count"] += 1
+
+    def test_status(self, data):
+        logs = self.current["unexpected_logs"]
+        intermittent_logs = self.current["intermittent_logs"]
+        count = self.current["counts"]
+        count["subtest"]["count"] += 1
+
+        if "expected" in data:
+            if data["status"] not in data.get("known_intermittent", []):
+                count["subtest"]["unexpected"][data["status"].lower()] += 1
+                if data["test"] not in logs:
+                    logs[data["test"]] = []
+                logs[data["test"]].append(data)
+            else:
+                count["subtest"]["expected"][data["status"].lower()] += 1
+                count["subtest"]["known_intermittent"][data["status"].lower()] += 1
+                if data["test"] not in intermittent_logs:
+                    intermittent_logs[data["test"]] = []
+                intermittent_logs[data["test"]].append(data)
+        else:
+            count["subtest"]["expected"][data["status"].lower()] += 1
+
+    def test_end(self, data):
+        logs = self.current["unexpected_logs"]
+        intermittent_logs = self.current["intermittent_logs"]
+        count = self.current["counts"]
+        if "expected" in data:
+            if data["status"] not in data.get("known_intermittent", []):
+                count["test"]["unexpected"][data["status"].lower()] += 1
+                if data["test"] not in logs:
+                    logs[data["test"]] = []
+                logs[data["test"]].append(data)
+            else:
+                count["test"]["expected"][data["status"].lower()] += 1
+                count["test"]["known_intermittent"][data["status"].lower()] += 1
+                if data["test"] not in intermittent_logs:
+                    intermittent_logs[data["test"]] = []
+                intermittent_logs[data["test"]].append(data)
+        else:
+            count["test"]["expected"][data["status"].lower()] += 1
+
+    def assertion_count(self, data):
+        count = self.current["counts"]
+        count["assert"]["count"] += 1
+
+        if data["min_expected"] <= data["count"] <= data["max_expected"]:
+            if data["count"] > 0:
+                count["assert"]["expected"]["fail"] += 1
+            else:
+                count["assert"]["expected"]["pass"] += 1
+        elif data["max_expected"] < data["count"]:
+            count["assert"]["unexpected"]["fail"] += 1
+        else:
+            count["assert"]["unexpected"]["pass"] += 1
+
+    def log(self, data):
+        if not self.current_suite:
+            return
+
+        logs = self.current["harness_errors"]
+        level = data.get("level").upper()
+
+        if level in ("CRITICAL", "ERROR"):
+            logs.append(data)
diff --git a/testing/mozbase/mozlog/mozlog/handlers/valgrindhandler.py b/testing/mozbase/mozlog/mozlog/handlers/valgrindhandler.py
new file mode 100644
index 0000000000..49bb4b5b9e
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/handlers/valgrindhandler.py
@@ -0,0 +1,138 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import re
+
+from .base import BaseHandler
+
+
+class ValgrindHandler(BaseHandler):
+    def __init__(self, inner):
+        BaseHandler.__init__(self, inner)
+        self.inner = inner
+        self.vFilter = ValgrindFilter()
+
+    def __call__(self, data):
+        tmp = self.vFilter(data)
+        if tmp is not None:
+            self.inner(tmp)
+
+
+class ValgrindFilter(object):
+    """
+    A class for handling Valgrind output.
+
+    Valgrind errors look like this:
+
+    ==60741== 40 (24 direct, 16 indirect) bytes in 1 blocks are definitely lost in loss
+                  record 2,746 of 5,235
+    ==60741==    at 0x4C26B43: calloc (vg_replace_malloc.c:593)
+    ==60741==    by 0x63AEF65: PR_Calloc (prmem.c:443)
+    ==60741==    by 0x69F236E: PORT_ZAlloc_Util (secport.c:117)
+    ==60741==    by 0x69F1336: SECITEM_AllocItem_Util (secitem.c:28)
+    ==60741==    by 0xA04280B: ffi_call_unix64 (in /builds/slave/m-in-l64-valgrind-000000000000/objdir/toolkit/library/libxul.so) # noqa
+    ==60741==    by 0xA042443: ffi_call (ffi64.c:485)
+
+    For each such error, this class extracts most or all of the first (error
+    kind) line, plus the function name in each of the first few stack entries.
+    With this data it constructs and prints a TEST-UNEXPECTED-FAIL message that
+    TBPL will highlight.
+
+    It buffers these lines from which text is extracted so that the
+    TEST-UNEXPECTED-FAIL message can be printed before the full error.
+
+    Parsing the Valgrind output isn't ideal, and it may break in the future if
+    Valgrind changes the format of the messages, or introduces new error kinds.
+    To protect against this, we also count how many lines containing
+    "<insert_a_suppression_name_here>" are seen. Thanks to the use of
+    --gen-suppressions=yes, exactly one of these lines is present per error. If
+    the count of these lines doesn't match the error count found during
+    parsing, then the parsing has missed one or more errors and we can fail
+    appropriately.
+    """
+
+    def __init__(self):
+        # The regexps in this list match all of Valgrind's errors. Note that
+        # Valgrind is English-only, so we don't have to worry about
+        # localization.
+        self.re_error = re.compile(
+            r"==\d+== ("
+            + r"(Use of uninitialised value of size \d+)|"
+            + r"(Conditional jump or move depends on uninitialised value\(s\))|"
+            + r"(Syscall param .* contains uninitialised byte\(s\))|"
+            + r"(Syscall param .* points to (unaddressable|uninitialised) byte\(s\))|"
+            + r"((Unaddressable|Uninitialised) byte\(s\) found during client check request)|"
+            + r"(Invalid free\(\) / delete / delete\[\] / realloc\(\))|"
+            + r"(Mismatched free\(\) / delete / delete \[\])|"
+            + r"(Invalid (read|write) of size \d+)|"
+            + r"(Jump to the invalid address stated on the next line)|"
+            + r"(Source and destination overlap in .*)|"
+            + r"(.* bytes in .* blocks are .* lost)"
+            + r")"
+        )
+        # Match identifer chars, plus ':' for namespaces, and '\?' in order to
+        # match "???" which Valgrind sometimes produces.
+        self.re_stack_entry = re.compile(r"^==\d+==.*0x[A-Z0-9]+: ([A-Za-z0-9_:\?]+)")
+        self.re_suppression = re.compile(r" *<insert_a_suppression_name_here>")
+        self.error_count = 0
+        self.suppression_count = 0
+        self.number_of_stack_entries_to_get = 0
+        self.curr_failure_msg = ""
+        self.buffered_lines = []
+
+    # Takes a message and returns a message
+    def __call__(self, msg):
+        # Pass through everything that isn't plain text
+        if msg["action"] != "log":
+            return msg
+
+        line = msg["message"]
+        output_message = None
+        if self.number_of_stack_entries_to_get == 0:
+            # Look for the start of a Valgrind error.
+            m = re.search(self.re_error, line)
+            if m:
+                self.error_count += 1
+                self.number_of_stack_entries_to_get = 4
+                self.curr_failure_msg = m.group(1) + " at "
+                self.buffered_lines = [line]
+            else:
+                output_message = msg
+
+        else:
+            # We've recently found a Valgrind error, and are now extracting
+            # details from the first few stack entries.
+            self.buffered_lines.append(line)
+            m = re.match(self.re_stack_entry, line)
+            if m:
+                self.curr_failure_msg += m.group(1)
+            else:
+                self.curr_failure_msg += "?!?"
+
+            self.number_of_stack_entries_to_get -= 1
+            if self.number_of_stack_entries_to_get != 0:
+                self.curr_failure_msg += " / "
+            else:
+                # We've finished getting the first few stack entries.  Emit
+                # the failure action, comprising the primary message and the
+                # buffered lines, and then reset state.  Copy the mandatory
+                # fields from the incoming message, since there's nowhere
+                # else to get them from.
+                output_message = {  # Mandatory fields
+                    u"action": "valgrind_error",
+                    u"time": msg["time"],
+                    u"thread": msg["thread"],
+                    u"pid": msg["pid"],
+                    u"source": msg["source"],
+                    # valgrind_error specific fields
+                    u"primary": self.curr_failure_msg,
+                    u"secondary": self.buffered_lines,
+                }
+                self.curr_failure_msg = ""
+                self.buffered_lines = []
+
+        if re.match(self.re_suppression, line):
+            self.suppression_count += 1
+
+        return output_message
diff --git a/testing/mozbase/mozlog/mozlog/logtypes.py b/testing/mozbase/mozlog/mozlog/logtypes.py
new file mode 100644
index 0000000000..00ff414d1c
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/logtypes.py
@@ -0,0 +1,302 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import inspect
+
+import six
+from six.moves import range, zip
+
+convertor_registry = {}
+missing = object()
+no_default = object()
+
+
+class log_action(object):
+    def __init__(self, *args):
+        self.args = {}
+
+        self.args_no_default = []
+        self.args_with_default = []
+        self.optional_args = set()
+
+        # These are the required fields in a log message that usually aren't
+        # supplied by the caller, but can be in the case of log_raw
+        self.default_args = [
+            Unicode("action"),
+            Int("time"),
+            Unicode("thread"),
+            Int("pid", default=None),
+            Unicode("source"),
+            Unicode("component"),
+        ]
+
+        for arg in args:
+            if arg.default is no_default:
+                self.args_no_default.append(arg.name)
+            else:
+                self.args_with_default.append(arg.name)
+
+            if arg.optional:
+                self.optional_args.add(arg.name)
+
+            if arg.name in self.args:
+                raise ValueError("Repeated argument name %s" % arg.name)
+
+            self.args[arg.name] = arg
+
+        for extra in self.default_args:
+            self.args[extra.name] = extra
+
+    def __call__(self, f):
+        convertor_registry[f.__name__] = self
+        converter = self
+
+        def inner(self, *args, **kwargs):
+            data = converter.convert(*args, **kwargs)
+            return f(self, data)
+
+        if hasattr(f, "__doc__"):
+            setattr(inner, "__doc__", f.__doc__)
+
+        return inner
+
+    def convert(self, *args, **kwargs):
+        data = {}
+        values = {}
+        values.update(kwargs)
+
+        positional_no_default = [
+            item for item in self.args_no_default if item not in values
+        ]
+
+        num_no_default = len(positional_no_default)
+
+        if len(args) < num_no_default:
+            raise TypeError("Too few arguments")
+
+        if len(args) > num_no_default + len(self.args_with_default):
+            raise TypeError("Too many arguments")
+
+        for i, name in enumerate(positional_no_default):
+            values[name] = args[i]
+
+        positional_with_default = [
+            self.args_with_default[i] for i in range(len(args) - num_no_default)
+        ]
+
+        for i, name in enumerate(positional_with_default):
+            if name in values:
+                raise TypeError("Argument %s specified twice" % name)
+            values[name] = args[i + num_no_default]
+
+        # Fill in missing arguments
+        for name in self.args_with_default:
+            if name not in values:
+                values[name] = self.args[name].default
+
+        for key, value in six.iteritems(values):
+            if key in self.args:
+                out_value = self.args[key](value)
+                if out_value is not missing:
+                    if key in self.optional_args and value == self.args[key].default:
+                        pass
+                    else:
+                        data[key] = out_value
+            else:
+                raise TypeError("Unrecognised argument %s" % key)
+
+        return data
+
+    def convert_known(self, **kwargs):
+        known_kwargs = {
+            name: value for name, value in six.iteritems(kwargs) if name in self.args
+        }
+        return self.convert(**known_kwargs)
+
+
+class DataType(object):
+    def __init__(self, name, default=no_default, optional=False):
+        self.name = name
+        self.default = default
+
+        if default is no_default and optional is not False:
+            raise ValueError("optional arguments require a default value")
+
+        self.optional = optional
+
+    def __call__(self, value):
+        if value == self.default:
+            if self.optional:
+                return missing
+            return self.default
+
+        try:
+            return self.convert(value)
+        except Exception:
+            raise ValueError(
+                "Failed to convert value %s of type %s for field %s to type %s"
+                % (value, type(value).__name__, self.name, self.__class__.__name__)
+            )
+
+
+class ContainerType(DataType):
+    """A DataType that contains other DataTypes.
+
+    ContainerTypes must specify which other DataType they will contain. ContainerTypes
+    may contain other ContainerTypes.
+
+    Some examples:
+
+        List(Int, 'numbers')
+        Tuple((Unicode, Int, Any), 'things')
+        Dict(Unicode, 'config')
+        Dict({TestId: Status}, 'results')
+        Dict(List(Unicode), 'stuff')
+    """
+
+    def __init__(self, item_type, name=None, **kwargs):
+        DataType.__init__(self, name, **kwargs)
+        self.item_type = self._format_item_type(item_type)
+
+    def _format_item_type(self, item_type):
+        if inspect.isclass(item_type):
+            return item_type(None)
+        return item_type
+
+
+class Unicode(DataType):
+    def convert(self, data):
+        if isinstance(data, six.text_type):
+            return data
+        if isinstance(data, str):
+            return data.decode("utf8", "replace")
+        return six.text_type(data)
+
+
+class TestId(DataType):
+    def convert(self, data):
+        if isinstance(data, six.text_type):
+            return data
+        elif isinstance(data, bytes):
+            return data.decode("utf-8", "replace")
+        elif isinstance(data, (tuple, list)):
+            # This is really a bit of a hack; should really split out convertors from the
+            # fields they operate on
+            func = Unicode(None).convert
+            return tuple(func(item) for item in data)
+        else:
+            raise ValueError
+
+
+class Status(DataType):
+    allowed = [
+        "PASS",
+        "FAIL",
+        "OK",
+        "ERROR",
+        "TIMEOUT",
+        "CRASH",
+        "ASSERT",
+        "PRECONDITION_FAILED",
+        "SKIP",
+    ]
+
+    def convert(self, data):
+        value = data.upper()
+        if value not in self.allowed:
+            raise ValueError
+        return value
+
+
+class SubStatus(Status):
+    allowed = [
+        "PASS",
+        "FAIL",
+        "ERROR",
+        "TIMEOUT",
+        "ASSERT",
+        "PRECONDITION_FAILED",
+        "NOTRUN",
+        "SKIP",
+    ]
+
+
+class Dict(ContainerType):
+    def _format_item_type(self, item_type):
+        superfmt = super(Dict, self)._format_item_type
+
+        if isinstance(item_type, dict):
+            if len(item_type) != 1:
+                raise ValueError(
+                    "Dict item type specifier must contain a single entry."
+                )
+            key_type, value_type = list(item_type.items())[0]
+            return superfmt(key_type), superfmt(value_type)
+        return Any(None), superfmt(item_type)
+
+    def convert(self, data):
+        key_type, value_type = self.item_type
+        return {
+            key_type.convert(k): value_type.convert(v) for k, v in dict(data).items()
+        }
+
+
+class List(ContainerType):
+    def convert(self, data):
+        # while dicts and strings _can_ be cast to lists,
+        # doing so is likely not intentional behaviour
+        if isinstance(data, (six.string_types, dict)):
+            raise ValueError("Expected list but got %s" % type(data))
+        return [self.item_type.convert(item) for item in data]
+
+
+class TestList(DataType):
+    """A TestList is a list of tests that can be either keyed by a group name,
+    or specified as a flat list.
+    """
+
+    def convert(self, data):
+        if isinstance(data, (list, tuple)):
+            data = {"default": data}
+        return Dict({Unicode: List(Unicode)}).convert(data)
+
+
+class Int(DataType):
+    def convert(self, data):
+        return int(data)
+
+
+class Any(DataType):
+    def convert(self, data):
+        return data
+
+
+class Boolean(DataType):
+    def convert(self, data):
+        return bool(data)
+
+
+class Tuple(ContainerType):
+    def _format_item_type(self, item_type):
+        superfmt = super(Tuple, self)._format_item_type
+
+        if isinstance(item_type, (tuple, list)):
+            return [superfmt(t) for t in item_type]
+        return (superfmt(item_type),)
+
+    def convert(self, data):
+        if len(data) != len(self.item_type):
+            raise ValueError(
+                "Expected %i items got %i" % (len(self.item_type), len(data))
+            )
+        return tuple(
+            item_type.convert(value) for item_type, value in zip(self.item_type, data)
+        )
+
+
+class Nullable(ContainerType):
+    def convert(self, data):
+        if data is None:
+            return data
+        return self.item_type.convert(data)
diff --git a/testing/mozbase/mozlog/mozlog/proxy.py b/testing/mozbase/mozlog/mozlog/proxy.py
new file mode 100644
index 0000000000..1d5994406b
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/proxy.py
@@ -0,0 +1,81 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from threading import Thread
+
+from .structuredlog import StructuredLogger, get_default_logger
+
+
+class ProxyLogger(object):
+    """
+    A ProxyLogger behaves like a
+    :class:`mozlog.structuredlog.StructuredLogger`.
+
+    Each method and attribute access will be forwarded to the underlying
+    StructuredLogger.
+
+    RuntimeError will be raised when the default logger is not yet initialized.
+    """
+
+    def __init__(self, component=None):
+        self.logger = None
+        self._component = component
+
+    def __getattr__(self, name):
+        if self.logger is None:
+            self.logger = get_default_logger(component=self._component)
+            if self.logger is None:
+                raise RuntimeError("Default logger is not initialized!")
+        return getattr(self.logger, name)
+
+
+def get_proxy_logger(component=None):
+    """
+    Returns a :class:`ProxyLogger` for the given component.
+    """
+    return ProxyLogger(component)
+
+
+class QueuedProxyLogger(StructuredLogger):
+    """Logger that logs via a queue.
+
+    This is intended for multiprocessing use cases where there are
+    some subprocesses which want to share a log handler with the main thread,
+    without the overhead of having a multiprocessing lock for all logger
+    access."""
+
+    threads = {}
+
+    def __init__(self, logger, mp_context=None):
+        StructuredLogger.__init__(self, logger.name)
+
+        if mp_context is None:
+            import multiprocessing as mp_context
+
+        if logger.name not in self.threads:
+            self.threads[logger.name] = LogQueueThread(mp_context.Queue(), logger)
+            self.threads[logger.name].start()
+        self.queue = self.threads[logger.name].queue
+
+    def _handle_log(self, data):
+        self.queue.put(data)
+
+
+class LogQueueThread(Thread):
+    def __init__(self, queue, logger):
+        self.queue = queue
+        self.logger = logger
+        Thread.__init__(self, name="Thread-Log")
+        self.daemon = True
+
+    def run(self):
+        while True:
+            try:
+                msg = self.queue.get()
+            except (EOFError, IOError):
+                break
+            if msg is None:
+                break
+            else:
+                self.logger._handle_log(msg)
diff --git a/testing/mozbase/mozlog/mozlog/pytest_mozlog/__init__.py b/testing/mozbase/mozlog/mozlog/pytest_mozlog/__init__.py
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/testing/mozbase/mozlog/mozlog/pytest_mozlog/plugin.py b/testing/mozbase/mozlog/mozlog/pytest_mozlog/plugin.py
new file mode 100644
index 0000000000..ce51dacdec
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/pytest_mozlog/plugin.py
@@ -0,0 +1,127 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import time
+
+import pytest
+import six
+
+import mozlog
+
+
+def pytest_addoption(parser):
+    # We can't simply use mozlog.commandline.add_logging_group(parser) here because
+    # Pytest's parser doesn't have the add_argument_group method Mozlog expects.
+    group = parser.getgroup("mozlog")
+
+    for name, (_class, _help) in six.iteritems(mozlog.commandline.log_formatters):
+        group.addoption("--log-{0}".format(name), action="append", help=_help)
+
+    formatter_options = six.iteritems(mozlog.commandline.fmt_options)
+    for name, (_class, _help, formatters, action) in formatter_options:
+        for formatter in formatters:
+            if formatter in mozlog.commandline.log_formatters:
+                group.addoption(
+                    "--log-{0}-{1}".format(formatter, name), action=action, help=_help
+                )
+
+
+def pytest_configure(config):
+    # If using pytest-xdist for parallelization, only register plugin on master process
+    if not hasattr(config, "slaveinput"):
+        config.pluginmanager.register(MozLog())
+
+
+class MozLog(object):
+    def __init__(self):
+        self._started = False
+        self.results = {}
+        self.start_time = int(time.time() * 1000)  # in ms for Mozlog compatibility
+
+    def _log_suite_start(self, tests):
+        if not self._started:
+            # As this is called for each node when using pytest-xdist, we want
+            # to avoid logging multiple suite_start messages.
+            self.logger.suite_start(
+                tests=tests, time=self.start_time, run_info=self.run_info
+            )
+            self._started = True
+
+    def pytest_configure(self, config):
+        mozlog.commandline.setup_logging(
+            "pytest",
+            config.known_args_namespace,
+            defaults={},
+            allow_unused_options=True,
+        )
+        self.logger = mozlog.get_default_logger(component="pytest")
+
+    def pytest_sessionstart(self, session):
+        """Called before test collection; records suite start time to log later"""
+        self.start_time = int(time.time() * 1000)  # in ms for Mozlog compatibility
+        self.run_info = getattr(session.config, "_metadata", None)
+
+    def pytest_collection_finish(self, session):
+        """Called after test collection is completed, just before tests are run (suite start)"""
+        self._log_suite_start([item.nodeid for item in session.items])
+
+    @pytest.mark.optionalhook
+    def pytest_xdist_node_collection_finished(self, node, ids):
+        """Called after each pytest-xdist node collection is completed"""
+        self._log_suite_start(ids)
+
+    def pytest_sessionfinish(self, session, exitstatus):
+        self.logger.suite_end()
+
+    def pytest_runtest_logstart(self, nodeid, location):
+        self.logger.test_start(test=nodeid)
+
+    def pytest_runtest_logreport(self, report):
+        """Called 3 times per test (setup, call, teardown), indicated by report.when"""
+        test = report.nodeid
+        status = expected = "PASS"
+        message = stack = None
+        if hasattr(report, "wasxfail"):
+            expected = "FAIL"
+        if report.failed or report.outcome == "rerun":
+            status = "FAIL" if report.when == "call" else "ERROR"
+        if report.skipped:
+            status = "SKIP" if not hasattr(report, "wasxfail") else "FAIL"
+        if report.longrepr is not None:
+            longrepr = report.longrepr
+            if isinstance(longrepr, six.string_types):
+                # When using pytest-xdist, longrepr is serialised as a str
+                message = stack = longrepr
+                if longrepr.startswith("[XPASS(strict)]"):
+                    # Strict expected failures have an outcome of failed when
+                    # they unexpectedly pass.
+                    expected, status = ("FAIL", "PASS")
+            elif hasattr(longrepr, "reprcrash"):
+                # For failures, longrepr is a ReprExceptionInfo
+                crash = longrepr.reprcrash
+                message = "{0} (line {1})".format(crash.message, crash.lineno)
+                stack = longrepr.reprtraceback
+            elif hasattr(longrepr, "errorstring"):
+                message = longrepr.errorstring
+                stack = longrepr.errorstring
+            elif hasattr(longrepr, "__getitem__") and len(longrepr) == 3:
+                # For skips, longrepr is a tuple of (file, lineno, reason)
+                message = report.longrepr[-1]
+            else:
+                raise ValueError(
+                    "Unable to convert longrepr to message:\ntype %s\nfields: %s"
+                    % (longrepr.__class__, dir(longrepr))
+                )
+        if status != expected or expected != "PASS":
+            self.results[test] = (status, expected, message, stack)
+        if report.outcome == "rerun" or report.when == "teardown":
+            defaults = ("PASS", "PASS", None, None)
+            status, expected, message, stack = self.results.get(test, defaults)
+            self.logger.test_end(
+                test=test,
+                status=status,
+                expected=expected,
+                message=message,
+                stack=stack,
+            )
diff --git a/testing/mozbase/mozlog/mozlog/reader.py b/testing/mozbase/mozlog/mozlog/reader.py
new file mode 100644
index 0000000000..af5470f351
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/reader.py
@@ -0,0 +1,78 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import json
+
+
+def read(log_f, raise_on_error=False):
+    """Return a generator that will return the entries in a structured log file.
+    Note that the caller must not close the file whilst the generator is still
+    in use.
+
+    :param log_f: file-like object containing the raw log entries, one per line
+    :param raise_on_error: boolean indicating whether ValueError should be raised
+                           for lines that cannot be decoded."""
+    while True:
+        line = log_f.readline()
+        if not line:
+            # This allows log_f to be a stream like stdout
+            break
+        try:
+            yield json.loads(line)
+        except ValueError:
+            if raise_on_error:
+                raise
+
+
+def imap_log(log_iter, action_map):
+    """Create an iterator that will invoke a callback per action for each item in a
+    iterable containing structured log entries
+
+    :param log_iter: Iterator returning structured log entries
+    :param action_map: Dictionary mapping action name to callback function. Log items
+                       with actions not in this dictionary will be skipped.
+    """
+    for item in log_iter:
+        if item["action"] in action_map:
+            yield action_map[item["action"]](item)
+
+
+def each_log(log_iter, action_map):
+    """Call a callback for each item in an iterable containing structured
+    log entries
+
+    :param log_iter: Iterator returning structured log entries
+    :param action_map: Dictionary mapping action name to callback function. Log items
+                       with actions not in this dictionary will be skipped.
+    """
+    for item in log_iter:
+        if item["action"] in action_map:
+            action_map[item["action"]](item)
+
+
+class LogHandler(object):
+    """Base class for objects that act as log handlers. A handler is a callable
+    that takes a log entry as the only argument.
+
+    Subclasses are expected to provide a method for each action type they
+    wish to handle, each taking a single argument for the test data.
+    For example a trivial subclass that just produces the id of each test as
+    it starts might be::
+
+      class StartIdHandler(LogHandler):
+          def test_start(data):
+              #For simplicity in the example pretend the id is always a string
+              return data["test"]
+    """
+
+    def __call__(self, data):
+        if hasattr(self, data["action"]):
+            handler = getattr(self, data["action"])
+            return handler(data)
+
+
+def handle_log(log_iter, handler):
+    """Call a handler for each item in a log, discarding the return value"""
+    for item in log_iter:
+        handler(item)
diff --git a/testing/mozbase/mozlog/mozlog/scripts/__init__.py b/testing/mozbase/mozlog/mozlog/scripts/__init__.py
new file mode 100644
index 0000000000..f1392507f8
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/scripts/__init__.py
@@ -0,0 +1,41 @@
+#!/usr/bin/env python
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+import argparse
+
+import format as formatlog
+import logmerge
+import six
+import unstable
+
+
+def get_parser():
+    parser = argparse.ArgumentParser(
+        "structlog", description="Tools for dealing with structured logs"
+    )
+
+    commands = {
+        "unstable": (unstable.get_parser, unstable.main),
+        "format": (formatlog.get_parser, formatlog.main),
+        "logmerge": (logmerge.get_parser, logmerge.main),
+    }
+
+    sub_parser = parser.add_subparsers(title="Subcommands")
+
+    for command, (parser_func, main_func) in six.iteritems(commands):
+        parent = parser_func(False)
+        command_parser = sub_parser.add_parser(
+            command, description=parent.description, parents=[parent]
+        )
+        command_parser.set_defaults(func=main_func)
+
+    return parser
+
+
+def main():
+    parser = get_parser()
+    args = parser.parse_args()
+    args.func(**vars(args))
diff --git a/testing/mozbase/mozlog/mozlog/scripts/format.py b/testing/mozbase/mozlog/mozlog/scripts/format.py
new file mode 100644
index 0000000000..27a643068f
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/scripts/format.py
@@ -0,0 +1,55 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import argparse
+import sys
+
+from .. import commandline, handlers, reader
+
+
+def get_parser(add_help=True):
+    parser = argparse.ArgumentParser(
+        "format", description="Format a structured log stream", add_help=add_help
+    )
+    parser.add_argument(
+        "--input",
+        action="store",
+        default=None,
+        help="Filename to read from, defaults to stdin",
+    )
+    parser.add_argument(
+        "--output",
+        action="store",
+        default=None,
+        help="Filename to write to, defaults to stdout",
+    )
+    parser.add_argument(
+        "format", choices=list(commandline.log_formatters.keys()), help="Format to use"
+    )
+    return parser
+
+
+def main(**kwargs):
+    if kwargs["input"] is None:
+        input_file = sys.stdin
+    else:
+        input_file = open(kwargs["input"])
+    if kwargs["output"] is None:
+        output_file = sys.stdout
+    else:
+        output_file = open(kwargs["output"], "w")
+
+    formatter = commandline.log_formatters[kwargs["format"]][0]()
+
+    handler = handlers.StreamHandler(stream=output_file, formatter=formatter)
+
+    for data in reader.read(input_file):
+        handler(data)
+
+
+if __name__ == "__main__":
+    parser = get_parser()
+    args = parser.parse_args()
+    kwargs = vars(args)
+    main(**kwargs)
diff --git a/testing/mozbase/mozlog/mozlog/scripts/logmerge.py b/testing/mozbase/mozlog/mozlog/scripts/logmerge.py
new file mode 100644
index 0000000000..1114795387
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/scripts/logmerge.py
@@ -0,0 +1,90 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import argparse
+import json
+import os
+import sys
+import time
+from threading import current_thread
+
+from mozlog.reader import read
+
+
+def dump_entry(entry, output):
+    json.dump(entry, output)
+    output.write("\n")
+
+
+def fill_process_info(event):
+    # pylint: disable=W1633
+    event["time"] = int(round(time.time() * 1000))
+    event["thread"] = current_thread().name
+    event["pid"] = os.getpid()
+    return event
+
+
+def process_until(reader, output, action):
+    for entry in reader:
+        if entry["action"] == action:
+            return entry
+        dump_entry(entry, output)
+
+
+def process_until_suite_start(reader, output):
+    return process_until(reader, output, "suite_start")
+
+
+def process_until_suite_end(reader, output):
+    return process_until(reader, output, "suite_end")
+
+
+def validate_start_events(events):
+    for start in events:
+        if not start["run_info"] == events[0]["run_info"]:
+            print("Error: different run_info entries", file=sys.stderr)
+            sys.exit(1)
+
+
+def merge_start_events(events):
+    for start in events[1:]:
+        events[0]["tests"].extend(start["tests"])
+    return events[0]
+
+
+def get_parser(add_help=True):
+    parser = argparse.ArgumentParser(
+        "logmerge", description="Merge multiple log files.", add_help=add_help
+    )
+    parser.add_argument("-o", dest="output", help="output file, defaults to stdout")
+    parser.add_argument(
+        "files", metavar="File", type=str, nargs="+", help="file to be merged"
+    )
+    return parser
+
+
+def main(**kwargs):
+    if kwargs["output"] is None:
+        output = sys.stdout
+    else:
+        output = open(kwargs["output"], "w")
+    readers = [read(open(filename, "r")) for filename in kwargs["files"]]
+    start_events = [process_until_suite_start(reader, output) for reader in readers]
+    validate_start_events(start_events)
+    merged_start_event = merge_start_events(start_events)
+    dump_entry(fill_process_info(merged_start_event), output)
+
+    end_events = [process_until_suite_end(reader, output) for reader in readers]
+    dump_entry(fill_process_info(end_events[0]), output)
+
+    for reader in readers:
+        for entry in reader:
+            dump_entry(entry, output)
+
+
+if __name__ == "__main__":
+    parser = get_parser()
+    args = parser.parse_args()
+    kwargs = vars(args)
+    main(**kwargs)
diff --git a/testing/mozbase/mozlog/mozlog/scripts/unstable.py b/testing/mozbase/mozlog/mozlog/scripts/unstable.py
new file mode 100644
index 0000000000..4292aced2a
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/scripts/unstable.py
@@ -0,0 +1,148 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import argparse
+import json
+from collections import defaultdict
+
+import six
+
+from mozlog import reader
+
+
+class StatusHandler(reader.LogHandler):
+    def __init__(self):
+        self.run_info = None
+        self.statuses = defaultdict(
+            lambda: defaultdict(lambda: defaultdict(lambda: defaultdict(int)))
+        )
+
+    def test_id(self, test):
+        if type(test) in (str, six.text_type):
+            return test
+        else:
+            return tuple(test)
+
+    def suite_start(self, item):
+        self.run_info = tuple(sorted(item.get("run_info", {}).items()))
+
+    def test_status(self, item):
+        self.statuses[self.run_info][self.test_id(item["test"])][item["subtest"]][
+            item["status"]
+        ] += 1
+
+    def test_end(self, item):
+        self.statuses[self.run_info][self.test_id(item["test"])][None][
+            item["status"]
+        ] += 1
+
+    def suite_end(self, item):
+        self.run_info = None
+
+
+def get_statuses(filenames):
+    handler = StatusHandler()
+
+    for filename in filenames:
+        with open(filename) as f:
+            reader.handle_log(reader.read(f), handler)
+
+    return handler.statuses
+
+
+def _filter(results_cmp):
+    def inner(statuses):
+        rv = defaultdict(lambda: defaultdict(dict))
+
+        for run_info, tests in six.iteritems(statuses):
+            for test, subtests in six.iteritems(tests):
+                for name, results in six.iteritems(subtests):
+                    if results_cmp(results):
+                        rv[run_info][test][name] = results
+
+        return rv
+
+    return inner
+
+
+filter_unstable = _filter(lambda x: len(x) > 1)
+filter_stable = _filter(lambda x: len(x) == 1)
+
+
+def group_results(data):
+    rv = defaultdict(lambda: defaultdict(lambda: defaultdict(int)))
+
+    for run_info, tests in six.iteritems(data):
+        for test, subtests in six.iteritems(tests):
+            for name, results in six.iteritems(subtests):
+                for status, number in six.iteritems(results):
+                    rv[test][name][status] += number
+    return rv
+
+
+def print_results(data):
+    for run_info, tests in six.iteritems(data):
+        run_str = (
+            " ".join("%s:%s" % (k, v) for k, v in run_info)
+            if run_info
+            else "No Run Info"
+        )
+        print(run_str)
+        print("=" * len(run_str))
+        print_run(tests)
+
+
+def print_run(tests):
+    for test, subtests in sorted(tests.items()):
+        print("\n" + str(test))
+        print("-" * len(test))
+        for name, results in six.iteritems(subtests):
+            print(
+                "[%s]: %s"
+                % (
+                    name if name is not None else "",
+                    " ".join("%s (%i)" % (k, v) for k, v in six.iteritems(results)),
+                )
+            )
+
+
+def get_parser(add_help=True):
+    parser = argparse.ArgumentParser(
+        "unstable",
+        description="List tests that don't give consistent "
+        "results from one or more runs.",
+        add_help=add_help,
+    )
+    parser.add_argument(
+        "--json", action="store_true", default=False, help="Output in JSON format"
+    )
+    parser.add_argument(
+        "--group",
+        action="store_true",
+        default=False,
+        help="Group results from different run types",
+    )
+    parser.add_argument("log_file", nargs="+", help="Log files to read")
+    return parser
+
+
+def main(**kwargs):
+    unstable = filter_unstable(get_statuses(kwargs["log_file"]))
+    if kwargs["group"]:
+        unstable = group_results(unstable)
+
+    if kwargs["json"]:
+        print(json.dumps(unstable))
+    else:
+        if not kwargs["group"]:
+            print_results(unstable)
+        else:
+            print_run(unstable)
+
+
+if __name__ == "__main__":
+    parser = get_parser()
+    args = parser.parse_args()
+    kwargs = vars(args)
+    main(**kwargs)
diff --git a/testing/mozbase/mozlog/mozlog/stdadapter.py b/testing/mozbase/mozlog/mozlog/stdadapter.py
new file mode 100644
index 0000000000..0c13d61e43
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/stdadapter.py
@@ -0,0 +1,50 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import logging
+
+from .structuredlog import StructuredLogger, log_levels
+
+
+class UnstructuredHandler(logging.Handler):
+    def __init__(self, name=None, level=logging.NOTSET):
+        self.structured = StructuredLogger(name)
+        logging.Handler.__init__(self, level=level)
+
+    def emit(self, record):
+        if record.levelname in log_levels:
+            log_func = getattr(self.structured, record.levelname.lower())
+        else:
+            log_func = self.logger.debug
+        log_func(record.msg)
+
+    def handle(self, record):
+        self.emit(record)
+
+
+class LoggingWrapper(object):
+    def __init__(self, wrapped):
+        self.wrapped = wrapped
+        self.wrapped.addHandler(
+            UnstructuredHandler(
+                self.wrapped.name, logging.getLevelName(self.wrapped.level)
+            )
+        )
+
+    def add_handler(self, handler):
+        self.addHandler(handler)
+
+    def remove_handler(self, handler):
+        self.removeHandler(handler)
+
+    def __getattr__(self, name):
+        return getattr(self.wrapped, name)
+
+
+def std_logging_adapter(logger):
+    """Adapter for stdlib logging so that it produces structured
+    messages rather than standard logging messages
+
+    :param logger: logging.Logger to wrap"""
+    return LoggingWrapper(logger)
diff --git a/testing/mozbase/mozlog/mozlog/structuredlog.py b/testing/mozbase/mozlog/mozlog/structuredlog.py
new file mode 100644
index 0000000000..f1004ad360
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/structuredlog.py
@@ -0,0 +1,769 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import json
+import sys
+import time
+import traceback
+from multiprocessing import current_process
+from threading import Lock, current_thread
+
+import six
+
+from .logtypes import (
+    Any,
+    Boolean,
+    Dict,
+    Int,
+    List,
+    Nullable,
+    Status,
+    SubStatus,
+    TestId,
+    TestList,
+    Tuple,
+    Unicode,
+    convertor_registry,
+    log_action,
+)
+
+"""Structured Logging for recording test results.
+
+Allowed actions, and subfields:
+  suite_start
+      tests  - List of test names
+      name - Name for the suite
+      run_info - Dictionary of run properties
+
+  add_subsuite
+      name - Name for the subsuite (must be unique)
+      run_info - Updates to the suite run_info (optional)
+
+  suite_end
+
+  test_start
+      test - ID for the test
+      path - Relative path to test (optional)
+      subsuite - Name of the subsuite to which test belongs (optional)
+
+  test_end
+      test - ID for the test
+      status [PASS | FAIL | OK | ERROR | TIMEOUT | CRASH |
+              ASSERT PRECONDITION_FAILED | SKIP] - test status
+      expected [As for status] - Status that the test was expected to get,
+                                 or absent if the test got the expected status
+      extra - Dictionary of harness-specific extra information e.g. debug info
+      known_intermittent - List of known intermittent statuses that should
+                           not fail a test. eg. ['FAIL', 'TIMEOUT']
+      subsuite - Name of the subsuite to which test belongs (optional)
+
+  test_status
+      test - ID for the test
+      subtest - Name of the subtest
+      status [PASS | FAIL | TIMEOUT |
+              PRECONDITION_FAILED | NOTRUN | SKIP] - test status
+      expected [As for status] - Status that the subtest was expected to get,
+                                 or absent if the subtest got the expected status
+      known_intermittent - List of known intermittent statuses that should
+                           not fail a test. eg. ['FAIL', 'TIMEOUT']
+      subsuite - Name of the subsuite to which test belongs (optional)
+
+  process_output
+      process - PID of the process
+      command - Command line of the process
+      data - Output data from the process
+      test - ID of the test that the process was running (optional)
+      subsuite - Name of the subsuite that the process was running (optional)
+
+  assertion_count
+      count - Number of assertions produced
+      min_expected - Minimum expected number of assertions
+      max_expected - Maximum expected number of assertions
+      subsuite - Name of the subsuite for the tests that ran (optional)
+
+  lsan_leak
+      frames - List of stack frames from the leak report
+      scope - An identifier for the set of tests run during the browser session
+              (e.g. a directory name)
+      allowed_match - A stack frame in the list that matched a rule meaning the
+                      leak is expected
+      subsuite - Name of the subsuite for the tests that ran (optional)
+
+  lsan_summary
+      bytes - Number of bytes leaked
+      allocations - Number of allocations
+      allowed - Boolean indicating whether all detected leaks matched allow rules
+      subsuite - Name of the subsuite for the tests that ran (optional)
+
+  mozleak_object
+     process - Process that leaked
+     bytes - Number of bytes that leaked
+     name - Name of the object that leaked
+     scope - An identifier for the set of tests run during the browser session
+             (e.g. a directory name)
+     allowed - Boolean indicating whether the leak was permitted
+     subsuite - Name of the subsuite for the tests that ran (optional)
+
+  log
+      level [CRITICAL | ERROR | WARNING |
+             INFO | DEBUG] - level of the logging message
+      message - Message to log
+
+Subfields for all messages:
+      action - the action type of the current message
+      time - the timestamp in ms since the epoch of the log message
+      thread - name for the thread emitting the message
+      pid - id of the python process in which the logger is running
+      source - name for the source emitting the message
+      component - name of the subcomponent emitting the message
+"""
+
+_default_logger_name = None
+
+
+def get_default_logger(component=None):
+    """Gets the default logger if available, optionally tagged with component
+    name. Will return None if not yet set
+
+    :param component: The component name to tag log messages with
+    """
+    global _default_logger_name
+
+    if not _default_logger_name:
+        return None
+
+    return StructuredLogger(_default_logger_name, component=component)
+
+
+def set_default_logger(default_logger):
+    """Sets the default logger to logger.
+
+    It can then be retrieved with :py:func:`get_default_logger`
+
+    Note that :py:func:`~mozlog.commandline.setup_logging` will
+    set a default logger for you, so there should be no need to call this
+    function if you're using setting up logging that way (recommended).
+
+    :param default_logger: The logger to set to default.
+    """
+    global _default_logger_name
+
+    _default_logger_name = default_logger.name
+
+
+log_levels = dict(
+    (k.upper(), v)
+    for v, k in enumerate(["critical", "error", "warning", "info", "debug"])
+)
+
+lint_levels = ["ERROR", "WARNING"]
+
+
+def log_actions():
+    """Returns the set of actions implemented by mozlog."""
+    return set(convertor_registry.keys())
+
+
+class LoggerShutdownError(Exception):
+    """Raised when attempting to log after logger.shutdown() has been called."""
+
+
+class LoggerState(object):
+    def __init__(self):
+        self.reset()
+
+    def reset(self):
+        self.handlers = []
+        self.subsuites = set()
+        self.running_tests = set()
+        self.suite_started = False
+        self.component_states = {}
+        self.has_shutdown = False
+
+
+class ComponentState(object):
+    def __init__(self):
+        self.filter_ = None
+
+
+class StructuredLogger(object):
+    _lock = Lock()
+    _logger_states = {}
+    """Create a structured logger with the given name
+
+    :param name: The name of the logger.
+    :param component: A subcomponent that the logger belongs to (typically a library name)
+    """
+
+    def __init__(self, name, component=None):
+        self.name = name
+        self.component = component
+
+        with self._lock:
+            if name not in self._logger_states:
+                self._logger_states[name] = LoggerState()
+
+            if component not in self._logger_states[name].component_states:
+                self._logger_states[name].component_states[component] = ComponentState()
+
+        self._state = self._logger_states[name]
+        self._component_state = self._state.component_states[component]
+
+    def add_handler(self, handler):
+        """Add a handler to the current logger"""
+        self._state.handlers.append(handler)
+
+    def remove_handler(self, handler):
+        """Remove a handler from the current logger"""
+        self._state.handlers.remove(handler)
+
+    def reset_state(self):
+        """Resets the logger to a brand new state. This means all handlers
+        are removed, running tests are discarded and components are reset.
+        """
+        self._state.reset()
+        self._component_state = self._state.component_states[
+            self.component
+        ] = ComponentState()
+
+    def send_message(self, topic, command, *args):
+        """Send a message to each handler configured for this logger. This
+        part of the api is useful to those users requiring dynamic control
+        of a handler's behavior.
+
+        :param topic: The name used by handlers to subscribe to a message.
+        :param command: The name of the command to issue.
+        :param args: Any arguments known to the target for specialized
+                     behavior.
+        """
+        rv = []
+        for handler in self._state.handlers:
+            if hasattr(handler, "message_handler"):
+                rv += handler.message_handler.handle_message(topic, command, *args)
+        return rv
+
+    @property
+    def handlers(self):
+        """A list of handlers that will be called when a
+        message is logged from this logger"""
+        return self._state.handlers
+
+    @property
+    def component_filter(self):
+        return self._component_state.filter_
+
+    @component_filter.setter
+    def component_filter(self, value):
+        self._component_state.filter_ = value
+
+    def log_raw(self, raw_data):
+        if "action" not in raw_data:
+            raise ValueError
+
+        action = raw_data["action"]
+        converted_data = convertor_registry[action].convert_known(**raw_data)
+        for k, v in six.iteritems(raw_data):
+            if (
+                k not in converted_data
+                and k not in convertor_registry[action].optional_args
+            ):
+                converted_data[k] = v
+
+        data = self._make_log_data(action, converted_data)
+
+        if action in ("test_status", "test_end"):
+            if (
+                data["expected"] == data["status"]
+                or data["status"] == "SKIP"
+                or "expected" not in raw_data
+            ):
+                del data["expected"]
+
+        if not self._ensure_suite_state(action, data):
+            return
+
+        self._handle_log(data)
+
+    def _log_data(self, action, data=None):
+        if data is None:
+            data = {}
+
+        if data.get("subsuite") and data["subsuite"] not in self._state.subsuites:
+            self.error(f"Unrecognised subsuite {data['subsuite']}")
+            return
+
+        log_data = self._make_log_data(action, data)
+        self._handle_log(log_data)
+
+    def _handle_log(self, data):
+        if self._state.has_shutdown:
+            raise LoggerShutdownError(
+                "{} action received after shutdown.".format(data["action"])
+            )
+
+        with self._lock:
+            if self.component_filter:
+                data = self.component_filter(data)
+                if data is None:
+                    return
+
+            for handler in self.handlers:
+                try:
+                    handler(data)
+                except Exception:
+                    # Write the exception details directly to stderr because
+                    # log() would call this method again which is currently locked.
+                    print(
+                        "%s: Failure calling log handler:" % __name__,
+                        file=sys.__stderr__,
+                    )
+                    print(traceback.format_exc(), file=sys.__stderr__)
+
+    def _make_log_data(self, action, data):
+        all_data = {
+            "action": action,
+            "time": int(time.time() * 1000),
+            "thread": current_thread().name,
+            "pid": current_process().pid,
+            "source": self.name,
+        }
+        if self.component:
+            all_data["component"] = self.component
+        all_data.update(data)
+        return all_data
+
+    def _ensure_suite_state(self, action, data):
+        if action == "suite_start":
+            if self._state.suite_started:
+                # limit data to reduce unnecessary log bloat
+                self.error(
+                    "Got second suite_start message before suite_end. "
+                    + "Logged with data: {}".format(json.dumps(data)[:100])
+                )
+                return False
+            self._state.suite_started = True
+        elif action == "suite_end":
+            if not self._state.suite_started:
+                self.error(
+                    "Got suite_end message before suite_start. "
+                    + "Logged with data: {}".format(json.dumps(data))
+                )
+                return False
+            self._state.suite_started = False
+        return True
+
+    @log_action(
+        TestList("tests"),
+        Unicode("name", default=None, optional=True),
+        Dict(Any, "run_info", default=None, optional=True),
+        Dict(Any, "version_info", default=None, optional=True),
+        Dict(Any, "device_info", default=None, optional=True),
+        Dict(Any, "extra", default=None, optional=True),
+    )
+    def suite_start(self, data):
+        """Log a suite_start message
+
+        :param dict tests: Test identifiers that will be run in the suite, keyed by group name.
+        :param str name: Optional name to identify the suite.
+        :param dict run_info: Optional information typically provided by mozinfo.
+        :param dict version_info: Optional target application version information provided
+          by mozversion.
+        :param dict device_info: Optional target device information provided by mozdevice.
+        """
+        if not self._ensure_suite_state("suite_start", data):
+            return
+
+        self._log_data("suite_start", data)
+
+    @log_action(
+        Unicode("name"),
+        Dict(Any, "run_info", default=None, optional=True),
+    )
+    def add_subsuite(self, data):
+        """Log a add_subsuite message
+
+        :param str name: Name to identify the subsuite.
+        :param dict run_info: Optional information about the subsuite. This updates the suite run_info.
+        """
+        if data["name"] in self._state.subsuites:
+            return
+        run_info = data.get("run_info", {"subsuite": data["name"]})
+        if "subsuite" not in run_info:
+            run_info = run_info.copy()
+            run_info["subsuite"] = data["name"]
+        data["run_info"] = run_info
+        self._state.subsuites.add(data["name"])
+        self._log_data("add_subsuite", data)
+
+    @log_action(Dict(Any, "extra", default=None, optional=True))
+    def suite_end(self, data):
+        """Log a suite_end message"""
+        if not self._ensure_suite_state("suite_end", data):
+            return
+
+        self._state.subsuites.clear()
+
+        self._log_data("suite_end", data)
+
+    @log_action(
+        TestId("test"),
+        Unicode("path", default=None, optional=True),
+        Unicode("subsuite", default=None, optional=True),
+    )
+    def test_start(self, data):
+        """Log a test_start message
+
+        :param test: Identifier of the test that will run.
+        :param path: Path to test relative to some base (typically the root of
+                     the source tree).
+        :param subsuite: Optional name of the subsuite to which the test belongs.
+        """
+        if not self._state.suite_started:
+            self.error(
+                "Got test_start message before suite_start for test %s" % data["test"]
+            )
+            return
+        if data["test"] in self._state.running_tests:
+            self.error("test_start for %s logged while in progress." % data["test"])
+            return
+        self._state.running_tests.add(data["test"])
+        self._log_data("test_start", data)
+
+    @log_action(
+        TestId("test"),
+        Unicode("subtest"),
+        SubStatus("status"),
+        SubStatus("expected", default="PASS"),
+        Unicode("message", default=None, optional=True),
+        Unicode("stack", default=None, optional=True),
+        Dict(Any, "extra", default=None, optional=True),
+        List(SubStatus, "known_intermittent", default=None, optional=True),
+        Unicode("subsuite", default=None, optional=True),
+    )
+    def test_status(self, data):
+        """
+        Log a test_status message indicating a subtest result. Tests that
+        do not have subtests are not expected to produce test_status messages.
+
+        :param test: Identifier of the test that produced the result.
+        :param subtest: Name of the subtest.
+        :param status: Status string indicating the subtest result
+        :param expected: Status string indicating the expected subtest result.
+        :param message: Optional string containing a message associated with the result.
+        :param stack: Optional stack trace encountered during test execution.
+        :param extra: Optional suite-specific data associated with the test result.
+        :param known_intermittent: Optional list of string expected intermittent statuses
+        :param subsuite: Optional name of the subsuite to which the test belongs.
+        """
+
+        if data["expected"] == data["status"] or data["status"] == "SKIP":
+            del data["expected"]
+
+        if data["test"] not in self._state.running_tests:
+            self.error(
+                "test_status for %s logged while not in progress. "
+                "Logged with data: %s" % (data["test"], json.dumps(data))
+            )
+            return
+
+        self._log_data("test_status", data)
+
+    @log_action(
+        TestId("test"),
+        Status("status"),
+        Status("expected", default="OK"),
+        Unicode("message", default=None, optional=True),
+        Unicode("stack", default=None, optional=True),
+        Dict(Any, "extra", default=None, optional=True),
+        List(Status, "known_intermittent", default=None, optional=True),
+        Unicode("subsuite", default=None, optional=True),
+    )
+    def test_end(self, data):
+        """
+        Log a test_end message indicating that a test completed. For tests
+        with subtests this indicates whether the overall test completed without
+        errors. For tests without subtests this indicates the test result
+        directly.
+
+        :param test: Identifier of the test that produced the result.
+        :param status: Status string indicating the test result
+        :param expected: Status string indicating the expected test result.
+        :param message: Optonal string containing a message associated with the result.
+        :param stack: Optional stack trace encountered during test execution.
+        :param extra: Optional suite-specific data associated with the test result.
+        :param subsuite: Optional name of the subsuite to which the test belongs.
+        """
+
+        if data["expected"] == data["status"] or data["status"] == "SKIP":
+            del data["expected"]
+
+        if data["test"] not in self._state.running_tests:
+            self.error(
+                "test_end for %s logged while not in progress. "
+                "Logged with data: %s" % (data["test"], json.dumps(data))
+            )
+        else:
+            self._state.running_tests.remove(data["test"])
+            self._log_data("test_end", data)
+
+    @log_action(
+        Unicode("process"),
+        Unicode("data"),
+        Unicode("command", default=None, optional=True),
+        TestId("test", default=None, optional=True),
+        Unicode("subsuite", default=None, optional=True),
+    )
+    def process_output(self, data):
+        """Log output from a managed process.
+
+        :param process: A unique identifier for the process producing the output
+                        (typically the pid)
+        :param data: The output to log
+        :param command: Optional string representing the full command line used to start
+                        the process.
+        :param test: Optional ID of the test which the process was running.
+        :param subsuite: Optional name of the subsuite which the process was running.
+        """
+        self._log_data("process_output", data)
+
+    @log_action(
+        Unicode("process", default=None),
+        Unicode("signature", default="[Unknown]"),
+        TestId("test", default=None, optional=True),
+        Unicode("minidump_path", default=None, optional=True),
+        Unicode("minidump_extra", default=None, optional=True),
+        Int("stackwalk_retcode", default=None, optional=True),
+        Unicode("stackwalk_stdout", default=None, optional=True),
+        Unicode("stackwalk_stderr", default=None, optional=True),
+        Unicode("reason", default=None, optional=True),
+        Unicode("java_stack", default=None, optional=True),
+        List(Unicode, "stackwalk_errors", default=None),
+        Unicode("subsuite", default=None, optional=True),
+    )
+    def crash(self, data):
+        if data["stackwalk_errors"] is None:
+            data["stackwalk_errors"] = []
+
+        self._log_data("crash", data)
+
+    @log_action(
+        Unicode("primary", default=None), List(Unicode, "secondary", default=None)
+    )
+    def valgrind_error(self, data):
+        self._log_data("valgrind_error", data)
+
+    @log_action(
+        Unicode("process"),
+        Unicode("command", default=None, optional=True),
+        Unicode("subsuite", default=None, optional=True),
+    )
+    def process_start(self, data):
+        """Log start event of a process.
+
+        :param process: A unique identifier for the process producing the
+                        output (typically the pid)
+        :param command: Optional string representing the full command line used to
+                        start the process.
+        :param subsuite: Optional name of the subsuite using the process.
+        """
+        self._log_data("process_start", data)
+
+    @log_action(
+        Unicode("process"),
+        Int("exitcode"),
+        Unicode("command", default=None, optional=True),
+        Unicode("subsuite", default=None, optional=True),
+    )
+    def process_exit(self, data):
+        """Log exit event of a process.
+
+        :param process: A unique identifier for the process producing the
+                        output (typically the pid)
+        :param exitcode: the exit code
+        :param command: Optional string representing the full command line used to
+                        start the process.
+        :param subsuite: Optional name of the subsuite using the process.
+        """
+        self._log_data("process_exit", data)
+
+    @log_action(
+        TestId("test"),
+        Int("count"),
+        Int("min_expected"),
+        Int("max_expected"),
+        Unicode("subsuite", default=None, optional=True),
+    )
+    def assertion_count(self, data):
+        """Log count of assertions produced when running a test.
+
+        :param count: Number of assertions produced
+        :param min_expected: Minimum expected number of assertions
+        :param max_expected: Maximum expected number of assertions
+        :param subsuite: Optional name of the subsuite for the tests that ran
+        """
+        self._log_data("assertion_count", data)
+
+    @log_action(
+        List(Unicode, "frames"),
+        Unicode("scope", optional=True, default=None),
+        Unicode("allowed_match", optional=True, default=None),
+        Unicode("subsuite", default=None, optional=True),
+    )
+    def lsan_leak(self, data):
+        self._log_data("lsan_leak", data)
+
+    @log_action(
+        Int("bytes"),
+        Int("allocations"),
+        Boolean("allowed", optional=True, default=False),
+        Unicode("subsuite", default=None, optional=True),
+    )
+    def lsan_summary(self, data):
+        self._log_data("lsan_summary", data)
+
+    @log_action(
+        Unicode("process"),
+        Int("bytes"),
+        Unicode("name"),
+        Unicode("scope", optional=True, default=None),
+        Boolean("allowed", optional=True, default=False),
+        Unicode("subsuite", default=None, optional=True),
+    )
+    def mozleak_object(self, data):
+        self._log_data("mozleak_object", data)
+
+    @log_action(
+        Unicode("process"),
+        Nullable(Int, "bytes"),
+        Int("threshold"),
+        List(Unicode, "objects"),
+        Unicode("scope", optional=True, default=None),
+        Boolean("induced_crash", optional=True, default=False),
+        Boolean("ignore_missing", optional=True, default=False),
+        Unicode("subsuite", default=None, optional=True),
+    )
+    def mozleak_total(self, data):
+        self._log_data("mozleak_total", data)
+
+    @log_action()
+    def shutdown(self, data):
+        """Shutdown the logger.
+
+        This logs a 'shutdown' action after which any further attempts to use
+        the logger will raise a :exc:`LoggerShutdownError`.
+
+        This is also called implicitly from the destructor or
+        when exiting the context manager.
+        """
+        self._log_data("shutdown", data)
+        self._state.has_shutdown = True
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, exc, val, tb):
+        self.shutdown()
+
+
+def _log_func(level_name):
+    @log_action(Unicode("message"), Any("exc_info", default=False))
+    def log(self, data):
+        exc_info = data.pop("exc_info", None)
+        if exc_info:
+            if not isinstance(exc_info, tuple):
+                exc_info = sys.exc_info()
+            if exc_info != (None, None, None):
+                bt = traceback.format_exception(*exc_info)
+                data["stack"] = "\n".join(bt)
+
+        data["level"] = level_name
+        self._log_data("log", data)
+
+    log.__doc__ = (
+        """Log a message with level %s
+
+:param message: The string message to log
+:param exc_info: Either a boolean indicating whether to include a traceback
+                 derived from sys.exc_info() or a three-item tuple in the
+                 same format as sys.exc_info() containing exception information
+                 to log.
+"""
+        % level_name
+    )
+    log.__name__ = str(level_name).lower()
+    return log
+
+
+def _lint_func(level_name):
+    @log_action(
+        Unicode("path"),
+        Unicode("message", default=""),
+        Int("lineno", default=0),
+        Int("column", default=None, optional=True),
+        Unicode("hint", default=None, optional=True),
+        Unicode("source", default=None, optional=True),
+        Unicode("rule", default=None, optional=True),
+        Tuple((Int, Int), "lineoffset", default=None, optional=True),
+        Unicode("linter", default=None, optional=True),
+    )
+    def lint(self, data):
+        data["level"] = level_name
+        self._log_data("lint", data)
+
+    lint.__doc__ = """Log an error resulting from a failed lint check
+
+        :param linter: name of the linter that flagged this error
+        :param path: path to the file containing the error
+        :param message: text describing the error
+        :param lineno: line number that contains the error
+        :param column: column containing the error
+        :param hint: suggestion for fixing the error (optional)
+        :param source: source code context of the error (optional)
+        :param rule: name of the rule that was violated (optional)
+        :param lineoffset: denotes an error spans multiple lines, of the form
+                           (<lineno offset>, <num lines>) (optional)
+        """
+    lint.__name__ = str("lint_%s" % level_name)
+    return lint
+
+
+# Create all the methods on StructuredLog for log/lint levels
+for level_name in log_levels:
+    setattr(StructuredLogger, level_name.lower(), _log_func(level_name))
+
+for level_name in lint_levels:
+    level_name = level_name.lower()
+    name = "lint_%s" % level_name
+    setattr(StructuredLogger, name, _lint_func(level_name))
+
+
+class StructuredLogFileLike(object):
+    """Wrapper for file-like objects to redirect writes to logger
+    instead. Each call to `write` becomes a single log entry of type `log`.
+
+    When using this it is important that the callees i.e. the logging
+    handlers do not themselves try to write to the wrapped file as this
+    will cause infinite recursion.
+
+    :param logger: `StructuredLogger` to which to redirect the file write operations.
+    :param level: log level to use for each write.
+    :param prefix: String prefix to prepend to each log entry.
+    """
+
+    def __init__(self, logger, level="info", prefix=None):
+        self.logger = logger
+        self.log_func = getattr(self.logger, level)
+        self.prefix = prefix
+
+    def write(self, data):
+        if data.endswith("\n"):
+            data = data[:-1]
+        if data.endswith("\r"):
+            data = data[:-1]
+        if self.prefix is not None:
+            data = "%s: %s" % (self.prefix, data)
+        self.log_func(data)
+
+    def flush(self):
+        pass
diff --git a/testing/mozbase/mozlog/mozlog/unstructured/__init__.py b/testing/mozbase/mozlog/mozlog/unstructured/__init__.py
new file mode 100644
index 0000000000..24b8f5b405
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/unstructured/__init__.py
@@ -0,0 +1,8 @@
+# flake8: noqa
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from .logger import *
+from .loggingmixin import LoggingMixin
+from .loglistener import LogMessageServer
diff --git a/testing/mozbase/mozlog/mozlog/unstructured/logger.py b/testing/mozbase/mozlog/mozlog/unstructured/logger.py
new file mode 100644
index 0000000000..db436c9d11
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/unstructured/logger.py
@@ -0,0 +1,191 @@
+# flake8: noqa
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import json
+
+# Some of the build slave environments don't see the following when doing
+# 'from logging import *'
+# see https://bugzilla.mozilla.org/show_bug.cgi?id=700415#c35
+from logging import *
+from logging import addLevelName, basicConfig, debug
+from logging import getLogger as getSysLogger
+from logging import getLoggerClass, info, setLoggerClass, shutdown
+
+_default_level = INFO
+_LoggerClass = getLoggerClass()
+
+# Define mozlog specific log levels
+START = _default_level + 1
+END = _default_level + 2
+PASS = _default_level + 3
+KNOWN_FAIL = _default_level + 4
+FAIL = _default_level + 5
+CRASH = _default_level + 6
+# Define associated text of log levels
+addLevelName(START, "TEST-START")
+addLevelName(END, "TEST-END")
+addLevelName(PASS, "TEST-PASS")
+addLevelName(KNOWN_FAIL, "TEST-KNOWN-FAIL")
+addLevelName(FAIL, "TEST-UNEXPECTED-FAIL")
+addLevelName(CRASH, "PROCESS-CRASH")
+
+
+class MozLogger(_LoggerClass):
+    """
+    MozLogger class which adds some convenience log levels
+    related to automated testing in Mozilla and ability to
+    output structured log messages.
+    """
+
+    def testStart(self, message, *args, **kwargs):
+        """Logs a test start message"""
+        self.log(START, message, *args, **kwargs)
+
+    def testEnd(self, message, *args, **kwargs):
+        """Logs a test end message"""
+        self.log(END, message, *args, **kwargs)
+
+    def testPass(self, message, *args, **kwargs):
+        """Logs a test pass message"""
+        self.log(PASS, message, *args, **kwargs)
+
+    def testFail(self, message, *args, **kwargs):
+        """Logs a test fail message"""
+        self.log(FAIL, message, *args, **kwargs)
+
+    def testKnownFail(self, message, *args, **kwargs):
+        """Logs a test known fail message"""
+        self.log(KNOWN_FAIL, message, *args, **kwargs)
+
+    def processCrash(self, message, *args, **kwargs):
+        """Logs a process crash message"""
+        self.log(CRASH, message, *args, **kwargs)
+
+    def log_structured(self, action, params=None):
+        """Logs a structured message object."""
+        if params is None:
+            params = {}
+
+        level = params.get("_level", _default_level)
+        if isinstance(level, int):
+            params["_level"] = getLevelName(level)
+        else:
+            params["_level"] = level
+            level = getLevelName(level.upper())
+
+            # If the logger is fed a level number unknown to the logging
+            # module, getLevelName will return a string. Unfortunately,
+            # the logging module will raise a type error elsewhere if
+            # the level is not an integer.
+            if not isinstance(level, int):
+                level = _default_level
+
+        params["action"] = action
+
+        # The can message be None. This is expected, and shouldn't cause
+        # unstructured formatters to fail.
+        message = params.get("_message")
+
+        self.log(level, message, extra={"params": params})
+
+
+class JSONFormatter(Formatter):
+    """Log formatter for emitting structured JSON entries."""
+
+    def format(self, record):
+        # Default values determined by logger metadata
+        # pylint: disable=W1633
+        output = {
+            "_time": int(round(record.created * 1000, 0)),
+            "_namespace": record.name,
+            "_level": getLevelName(record.levelno),
+        }
+
+        # If this message was created by a call to log_structured,
+        # anything specified by the caller's params should act as
+        # an override.
+        output.update(getattr(record, "params", {}))
+
+        if record.msg and output.get("_message") is None:
+            # For compatibility with callers using the printf like
+            # API exposed by python logging, call the default formatter.
+            output["_message"] = Formatter.format(self, record)
+
+        return json.dumps(output, indent=output.get("indent"))
+
+
+class MozFormatter(Formatter):
+    """
+    MozFormatter class used to standardize formatting
+    If a different format is desired, this can be explicitly
+    overriden with the log handler's setFormatter() method
+    """
+
+    level_length = 0
+    max_level_length = len("TEST-START")
+
+    def __init__(self, include_timestamp=False):
+        """
+        Formatter.__init__ has fmt and datefmt parameters that won't have
+        any affect on a MozFormatter instance.
+
+        :param include_timestamp: if True, include formatted time at the
+                                  beginning of the message
+        """
+        self.include_timestamp = include_timestamp
+        Formatter.__init__(self)
+
+    def format(self, record):
+        # Handles padding so record levels align nicely
+        if len(record.levelname) > self.level_length:
+            pad = 0
+            if len(record.levelname) <= self.max_level_length:
+                self.level_length = len(record.levelname)
+        else:
+            pad = self.level_length - len(record.levelname) + 1
+        sep = "|".rjust(pad)
+        fmt = "%(name)s %(levelname)s " + sep + " %(message)s"
+        if self.include_timestamp:
+            fmt = "%(asctime)s " + fmt
+        # this protected member is used to define the format
+        # used by the base Formatter's method
+        self._fmt = fmt
+        return Formatter(fmt=fmt).format(record)
+
+
+def getLogger(name, handler=None):
+    """
+    Returns the logger with the specified name.
+    If the logger doesn't exist, it is created.
+    If handler is specified, adds it to the logger. Otherwise a default handler
+    that logs to standard output will be used.
+
+    :param name: The name of the logger to retrieve
+    :param handler: A handler to add to the logger. If the logger already exists,
+                    and a handler is specified, an exception will be raised. To
+                    add a handler to an existing logger, call that logger's
+                    addHandler method.
+    """
+    setLoggerClass(MozLogger)
+
+    if name in Logger.manager.loggerDict:
+        if handler:
+            raise ValueError(
+                "The handler parameter requires "
+                + "that a logger by this name does "
+                + "not already exist"
+            )
+        return Logger.manager.loggerDict[name]
+
+    logger = getSysLogger(name)
+    logger.setLevel(_default_level)
+
+    if handler is None:
+        handler = StreamHandler()
+        handler.setFormatter(MozFormatter())
+
+    logger.addHandler(handler)
+    logger.propagate = False
+    return logger
diff --git a/testing/mozbase/mozlog/mozlog/unstructured/loggingmixin.py b/testing/mozbase/mozlog/mozlog/unstructured/loggingmixin.py
new file mode 100644
index 0000000000..727e8f1a7d
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/unstructured/loggingmixin.py
@@ -0,0 +1,42 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from .logger import Logger, getLogger
+
+
+class LoggingMixin(object):
+    """Expose a subset of logging functions to an inheriting class."""
+
+    def set_logger(self, logger_instance=None, name=None):
+        """Method for setting the underlying logger instance to be used."""
+
+        if logger_instance and not isinstance(logger_instance, Logger):
+            raise ValueError("logger_instance must be an instance of Logger")
+
+        if name is None:
+            name = ".".join([self.__module__, self.__class__.__name__])
+
+        self._logger = logger_instance or getLogger(name)
+
+    def _log_msg(self, cmd, *args, **kwargs):
+        if not hasattr(self, "_logger"):
+            self._logger = getLogger(
+                ".".join([self.__module__, self.__class__.__name__])
+            )
+        getattr(self._logger, cmd)(*args, **kwargs)
+
+    def log(self, *args, **kwargs):
+        self._log_msg("log", *args, **kwargs)
+
+    def info(self, *args, **kwargs):
+        self._log_msg("info", *args, **kwargs)
+
+    def error(self, *args, **kwargs):
+        self._log_msg("error", *args, **kwargs)
+
+    def warn(self, *args, **kwargs):
+        self._log_msg("warn", *args, **kwargs)
+
+    def log_structured(self, *args, **kwargs):
+        self._log_msg("log_structured", *args, **kwargs)
diff --git a/testing/mozbase/mozlog/mozlog/unstructured/loglistener.py b/testing/mozbase/mozlog/mozlog/unstructured/loglistener.py
new file mode 100644
index 0000000000..0d57061236
--- /dev/null
+++ b/testing/mozbase/mozlog/mozlog/unstructured/loglistener.py
@@ -0,0 +1,50 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import json
+import socket
+
+from six.moves import socketserver
+
+
+class LogMessageServer(socketserver.TCPServer):
+    def __init__(self, server_address, logger, message_callback=None, timeout=3):
+        socketserver.TCPServer.__init__(self, server_address, LogMessageHandler)
+        self._logger = logger
+        self._message_callback = message_callback
+        self.timeout = timeout
+
+
+class LogMessageHandler(socketserver.BaseRequestHandler):
+    """Processes output from a connected log source, logging to an
+    existing logger upon receipt of a well-formed log messsage."""
+
+    def handle(self):
+        """Continually listens for log messages."""
+        self._partial_message = ""
+        self.request.settimeout(self.server.timeout)
+
+        while True:
+            try:
+                data = self.request.recv(1024)
+                if not data:
+                    return
+                self.process_message(data.decode())
+            except socket.timeout:
+                return
+
+    def process_message(self, data):
+        """Processes data from a connected log source. Messages are assumed
+        to be newline delimited, and generally well-formed JSON."""
+        for part in data.split("\n"):
+            msg_string = self._partial_message + part
+            try:
+                msg = json.loads(msg_string)
+                self._partial_message = ""
+                self.server._logger.log_structured(msg.get("action", "UNKNOWN"), msg)
+                if self.server._message_callback:
+                    self.server._message_callback()
+
+            except ValueError:
+                self._partial_message = msg_string
diff --git a/testing/mozbase/mozlog/setup.cfg b/testing/mozbase/mozlog/setup.cfg
new file mode 100644
index 0000000000..3c6e79cf31
--- /dev/null
+++ b/testing/mozbase/mozlog/setup.cfg
@@ -0,0 +1,2 @@
+[bdist_wheel]
+universal=1
diff --git a/testing/mozbase/mozlog/setup.py b/testing/mozbase/mozlog/setup.py
new file mode 100644
index 0000000000..3283374363
--- /dev/null
+++ b/testing/mozbase/mozlog/setup.py
@@ -0,0 +1,43 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from setuptools import find_packages, setup
+
+PACKAGE_NAME = "mozlog"
+PACKAGE_VERSION = "8.0.0"
+DEPS = [
+    "blessed>=1.19.1",
+    "mozterm",
+    "mozfile",
+    "six >= 1.13.0",
+]
+
+
+setup(
+    name=PACKAGE_NAME,
+    version=PACKAGE_VERSION,
+    description="Robust log handling specialized for logging in the Mozilla universe",
+    long_description="see https://firefox-source-docs.mozilla.org/mozbase/index.html",
+    author="Mozilla Automation and Testing Team",
+    author_email="tools@lists.mozilla.org",
+    url="https://wiki.mozilla.org/Auto-tools/Projects/Mozbase",
+    license="Mozilla Public License 2.0 (MPL 2.0)",
+    packages=find_packages(),
+    zip_safe=False,
+    install_requires=DEPS,
+    tests_require=["mozfile"],
+    platforms=["Any"],
+    classifiers=[
+        "Development Status :: 4 - Beta",
+        "Environment :: Console",
+        "Intended Audience :: Developers",
+        "License :: OSI Approved :: Mozilla Public License 2.0 (MPL 2.0)",
+        "Operating System :: OS Independent",
+        "Programming Language :: Python :: 2.7",
+        "Programming Language :: Python :: 3.5",
+        "Topic :: Software Development :: Libraries :: Python Modules",
+    ],
+    package_data={"mozlog": ["formatters/html/main.js", "formatters/html/style.css"]},
+    entry_points={"console_scripts": ["structlog = mozlog.scripts:main"]},
+)
diff --git a/testing/mozbase/mozlog/tests/conftest.py b/testing/mozbase/mozlog/tests/conftest.py
new file mode 100644
index 0000000000..eaf79897e4
--- /dev/null
+++ b/testing/mozbase/mozlog/tests/conftest.py
@@ -0,0 +1,24 @@
+import pytest
+from mozlog.formatters import ErrorSummaryFormatter, MachFormatter
+from mozlog.handlers import StreamHandler
+from mozlog.structuredlog import StructuredLogger
+from six import StringIO
+
+
+@pytest.fixture
+def get_logger():
+    # Ensure a new state instance is created for each test function.
+    StructuredLogger._logger_states = {}
+    formatters = {
+        "mach": MachFormatter,
+        "errorsummary": ErrorSummaryFormatter,
+    }
+
+    def inner(name, **fmt_args):
+        buf = StringIO()
+        fmt = formatters[name](**fmt_args)
+        logger = StructuredLogger("test_logger")
+        logger.add_handler(StreamHandler(buf, fmt))
+        return logger
+
+    return inner
diff --git a/testing/mozbase/mozlog/tests/manifest.ini b/testing/mozbase/mozlog/tests/manifest.ini
new file mode 100644
index 0000000000..23737ca469
--- /dev/null
+++ b/testing/mozbase/mozlog/tests/manifest.ini
@@ -0,0 +1,9 @@
+[DEFAULT]
+subsuite = mozbase
+[test_errorsummary.py]
+[test_logger.py]
+[test_logtypes.py]
+[test_formatters.py]
+[test_structured.py]
+[test_terminal_colors.py]
+[test_capture.py]
diff --git a/testing/mozbase/mozlog/tests/test_capture.py b/testing/mozbase/mozlog/tests/test_capture.py
new file mode 100644
index 0000000000..4adbda4180
--- /dev/null
+++ b/testing/mozbase/mozlog/tests/test_capture.py
@@ -0,0 +1,37 @@
+import sys
+import unittest
+
+import mozunit
+from mozlog import capture, structuredlog
+from test_structured import TestHandler
+
+
+class TestCaptureIO(unittest.TestCase):
+    """Tests expected logging output of CaptureIO"""
+
+    def setUp(self):
+        self.logger = structuredlog.StructuredLogger("test")
+        self.handler = TestHandler()
+        self.logger.add_handler(self.handler)
+
+    def test_captureio_log(self):
+        """
+        CaptureIO takes in two arguments. The second argument must
+        be truthy in order for the code to run. Hence, the string
+        "capture_stdio" has been used in this test case.
+        """
+        with capture.CaptureIO(self.logger, "capture_stdio"):
+            print("message 1")
+            sys.stdout.write("message 2")
+            sys.stderr.write("message 3")
+            sys.stdout.write("\xff")
+        log = self.handler.items
+        messages = [item["message"] for item in log]
+        self.assertIn("STDOUT: message 1", messages)
+        self.assertIn("STDOUT: message 2", messages)
+        self.assertIn("STDERR: message 3", messages)
+        self.assertIn(u"STDOUT: \xff", messages)
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/testing/mozbase/mozlog/tests/test_errorsummary.py b/testing/mozbase/mozlog/tests/test_errorsummary.py
new file mode 100644
index 0000000000..422bd53358
--- /dev/null
+++ b/testing/mozbase/mozlog/tests/test_errorsummary.py
@@ -0,0 +1,125 @@
+# -*- coding: utf-8 -*-
+
+import json
+import time
+
+import mozunit
+import pytest
+
+# flake8: noqa
+
+
+@pytest.mark.parametrize(
+    "logs,expected",
+    (
+        pytest.param(
+            [
+                (
+                    "suite_start",
+                    {
+                        "manifestA": ["test_foo", "test_bar", "test_baz"],
+                        "manifestB": ["test_something"],
+                    },
+                ),
+                ("test_start", "test_foo"),
+                ("test_end", "test_foo", "SKIP"),
+                ("test_start", "test_bar"),
+                ("test_end", "test_bar", "OK"),
+                ("test_start", "test_something"),
+                ("test_end", "test_something", "OK"),
+                ("test_start", "test_baz"),
+                ("test_end", "test_baz", "PASS", "FAIL"),
+                ("suite_end",),
+            ],
+            """
+                {"groups": ["manifestA", "manifestB"], "action": "test_groups", "line": 0}
+                {"test": "test_baz", "subtest": null, "group": "manifestA", "status": "PASS", "expected": "FAIL", "message": null, "stack": null, "known_intermittent": [], "action": "test_result", "line": 8}
+                {"group": "manifestA", "status": "ERROR", "duration": 70, "action": "group_result", "line": 9}
+                {"group": "manifestB", "status": "OK", "duration": 10, "action": "group_result", "line": 9}
+            """.strip(),
+            id="basic",
+        ),
+        pytest.param(
+            [
+                ("suite_start", {"manifest": ["test_foo"]}),
+                ("test_start", "test_foo"),
+                ("suite_end",),
+            ],
+            """
+                {"groups": ["manifest"], "action": "test_groups", "line": 0}
+                {"group": "manifest", "status": null, "duration": null, "action": "group_result", "line": 2}
+            """.strip(),
+            id="missing_test_end",
+        ),
+        pytest.param(
+            [
+                ("suite_start", {"manifest": ["test_foo"]}),
+                ("test_start", "test_foo"),
+                ("test_status", "test_foo", "subtest", "PASS"),
+                ("suite_end",),
+            ],
+            """
+                {"groups": ["manifest"], "action": "test_groups", "line": 0}
+                {"group": "manifest", "status": "ERROR", "duration": null, "action": "group_result", "line": 3}
+            """.strip(),
+            id="missing_test_end_with_test_status_ok",
+            marks=pytest.mark.xfail,  # status is OK but should be ERROR
+        ),
+        pytest.param(
+            [
+                (
+                    "suite_start",
+                    {
+                        "manifestA": ["test_foo", "test_bar", "test_baz"],
+                        "manifestB": ["test_something"],
+                    },
+                ),
+                ("test_start", "test_foo"),
+                ("test_end", "test_foo", "SKIP"),
+                ("test_start", "test_bar"),
+                ("test_end", "test_bar", "CRASH"),
+                ("test_start", "test_something"),
+                ("test_end", "test_something", "OK"),
+                ("test_start", "test_baz"),
+                ("test_end", "test_baz", "FAIL", "FAIL"),
+                ("suite_end",),
+            ],
+            """
+                {"groups": ["manifestA", "manifestB"], "action": "test_groups", "line": 0}
+                {"test": "test_bar", "subtest": null, "group": "manifestA", "status": "CRASH", "expected": "OK", "message": null, "stack": null, "known_intermittent": [], "action": "test_result", "line": 4}
+                {"group": "manifestA", "status": "ERROR", "duration": 70, "action": "group_result", "line": 9}
+                {"group": "manifestB", "status": "OK", "duration": 10, "action": "group_result", "line": 9}
+            """.strip(),
+            id="crash_and_group_status",
+        ),
+    ),
+)
+def test_errorsummary(monkeypatch, get_logger, logs, expected):
+    ts = {"ts": 0.0}  # need to use dict since 'nonlocal' doesn't exist on PY2
+
+    def fake_time():
+        ts["ts"] += 0.01
+        return ts["ts"]
+
+    monkeypatch.setattr(time, "time", fake_time)
+    logger = get_logger("errorsummary")
+
+    for log in logs:
+        getattr(logger, log[0])(*log[1:])
+
+    buf = logger.handlers[0].stream
+    result = buf.getvalue()
+    print("Dumping result for copy/paste:")
+    print(result)
+
+    expected = expected.split("\n")
+    for i, line in enumerate(result.split("\n")):
+        if not line:
+            continue
+
+        data = json.loads(line)
+        assert data == json.loads(expected[i])
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/testing/mozbase/mozlog/tests/test_formatters.py b/testing/mozbase/mozlog/tests/test_formatters.py
new file mode 100644
index 0000000000..e0e3a51d97
--- /dev/null
+++ b/testing/mozbase/mozlog/tests/test_formatters.py
@@ -0,0 +1,767 @@
+# encoding: utf-8
+
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import os
+import signal
+import unittest
+import xml.etree.ElementTree as ET
+from textwrap import dedent
+
+import mozunit
+import pytest
+from mozlog.formatters import (
+    GroupingFormatter,
+    HTMLFormatter,
+    MachFormatter,
+    TbplFormatter,
+    XUnitFormatter,
+)
+from mozlog.handlers import StreamHandler
+from mozlog.structuredlog import StructuredLogger
+from six import StringIO, ensure_text, unichr
+
+FORMATS = {
+    # A list of tuples consisting of (name, options, expected string).
+    "PASS": [
+        (
+            "mach",
+            {},
+            dedent(
+                """
+             0:00.00 SUITE_START: running 3 tests
+             0:00.00 TEST_START: test_foo
+             0:00.00 TEST_END: OK
+             0:00.00 TEST_START: test_bar
+             0:00.00 TEST_END: Test OK. Subtests passed 1/1. Unexpected 0
+             0:00.00 TEST_START: test_baz
+             0:00.00 TEST_END: FAIL
+             0:00.00 SUITE_END
+
+            suite 1
+            ~~~~~~~
+            Ran 4 checks (1 subtests, 3 tests)
+            Expected results: 4
+            Unexpected results: 0
+            OK
+            """
+            ).lstrip("\n"),
+        ),
+        (
+            "mach",
+            {"verbose": True},
+            dedent(
+                """
+             0:00.00 SUITE_START: running 3 tests
+             0:00.00 TEST_START: test_foo
+             0:00.00 TEST_END: OK
+             0:00.00 TEST_START: test_bar
+             0:00.00 PASS a subtest
+             0:00.00 TEST_END: Test OK. Subtests passed 1/1. Unexpected 0
+             0:00.00 TEST_START: test_baz
+             0:00.00 TEST_END: FAIL
+             0:00.00 SUITE_END
+
+            suite 1
+            ~~~~~~~
+            Ran 4 checks (1 subtests, 3 tests)
+            Expected results: 4
+            Unexpected results: 0
+            OK
+            """
+            ).lstrip("\n"),
+        ),
+    ],
+    "FAIL": [
+        (
+            "mach",
+            {},
+            dedent(
+                """
+             0:00.00 SUITE_START: running 3 tests
+             0:00.00 TEST_START: test_foo
+             0:00.00 TEST_END: FAIL, expected PASS - expected 0 got 1
+             0:00.00 TEST_START: test_bar
+             0:00.00 TEST_END: Test OK. Subtests passed 0/2. Unexpected 2
+            FAIL a subtest - expected 0 got 1
+                SimpleTest.is@SimpleTest/SimpleTest.js:312:5
+                @caps/tests/mochitest/test_bug246699.html:53:1
+            TIMEOUT another subtest
+             0:00.00 TEST_START: test_baz
+             0:00.00 TEST_END: PASS, expected FAIL
+             0:00.00 SUITE_END
+
+            suite 1
+            ~~~~~~~
+            Ran 5 checks (2 subtests, 3 tests)
+            Expected results: 1
+            Unexpected results: 4
+              test: 2 (1 fail, 1 pass)
+              subtest: 2 (1 fail, 1 timeout)
+
+            Unexpected Results
+            ------------------
+            test_foo
+              FAIL test_foo - expected 0 got 1
+            test_bar
+              FAIL a subtest - expected 0 got 1
+                SimpleTest.is@SimpleTest/SimpleTest.js:312:5
+                @caps/tests/mochitest/test_bug246699.html:53:1
+              TIMEOUT another subtest
+            test_baz
+              UNEXPECTED-PASS test_baz
+            """
+            ).lstrip("\n"),
+        ),
+        (
+            "mach",
+            {"verbose": True},
+            dedent(
+                """
+             0:00.00 SUITE_START: running 3 tests
+             0:00.00 TEST_START: test_foo
+             0:00.00 TEST_END: FAIL, expected PASS - expected 0 got 1
+             0:00.00 TEST_START: test_bar
+             0:00.00 FAIL a subtest - expected 0 got 1
+                SimpleTest.is@SimpleTest/SimpleTest.js:312:5
+                @caps/tests/mochitest/test_bug246699.html:53:1
+             0:00.00 TIMEOUT another subtest
+             0:00.00 TEST_END: Test OK. Subtests passed 0/2. Unexpected 2
+             0:00.00 TEST_START: test_baz
+             0:00.00 TEST_END: PASS, expected FAIL
+             0:00.00 SUITE_END
+
+            suite 1
+            ~~~~~~~
+            Ran 5 checks (2 subtests, 3 tests)
+            Expected results: 1
+            Unexpected results: 4
+              test: 2 (1 fail, 1 pass)
+              subtest: 2 (1 fail, 1 timeout)
+
+            Unexpected Results
+            ------------------
+            test_foo
+              FAIL test_foo - expected 0 got 1
+            test_bar
+              FAIL a subtest - expected 0 got 1
+                SimpleTest.is@SimpleTest/SimpleTest.js:312:5
+                @caps/tests/mochitest/test_bug246699.html:53:1
+              TIMEOUT another subtest
+            test_baz
+              UNEXPECTED-PASS test_baz
+            """
+            ).lstrip("\n"),
+        ),
+    ],
+    "PRECONDITION_FAILED": [
+        (
+            "mach",
+            {},
+            dedent(
+                """
+             0:00.00 SUITE_START: running 2 tests
+             0:00.00 TEST_START: test_foo
+             0:00.00 TEST_END: PRECONDITION_FAILED, expected OK
+             0:00.00 TEST_START: test_bar
+             0:00.00 TEST_END: Test OK. Subtests passed 1/2. Unexpected 1
+            PRECONDITION_FAILED another subtest
+             0:00.00 SUITE_END
+
+            suite 1
+            ~~~~~~~
+            Ran 4 checks (2 subtests, 2 tests)
+            Expected results: 2
+            Unexpected results: 2
+              test: 1 (1 precondition_failed)
+              subtest: 1 (1 precondition_failed)
+
+            Unexpected Results
+            ------------------
+            test_foo
+              PRECONDITION_FAILED test_foo
+            test_bar
+              PRECONDITION_FAILED another subtest
+            """
+            ).lstrip("\n"),
+        ),
+        (
+            "mach",
+            {"verbose": True},
+            dedent(
+                """
+             0:00.00 SUITE_START: running 2 tests
+             0:00.00 TEST_START: test_foo
+             0:00.00 TEST_END: PRECONDITION_FAILED, expected OK
+             0:00.00 TEST_START: test_bar
+             0:00.00 PASS a subtest
+             0:00.00 PRECONDITION_FAILED another subtest
+             0:00.00 TEST_END: Test OK. Subtests passed 1/2. Unexpected 1
+             0:00.00 SUITE_END
+
+            suite 1
+            ~~~~~~~
+            Ran 4 checks (2 subtests, 2 tests)
+            Expected results: 2
+            Unexpected results: 2
+              test: 1 (1 precondition_failed)
+              subtest: 1 (1 precondition_failed)
+
+            Unexpected Results
+            ------------------
+            test_foo
+              PRECONDITION_FAILED test_foo
+            test_bar
+              PRECONDITION_FAILED another subtest
+            """
+            ).lstrip("\n"),
+        ),
+    ],
+    "KNOWN-INTERMITTENT": [
+        (
+            "mach",
+            {},
+            dedent(
+                """
+             0:00.00 SUITE_START: running 3 tests
+             0:00.00 TEST_START: test_foo
+             0:00.00 TEST_END: FAIL
+            KNOWN-INTERMITTENT-FAIL test_foo
+             0:00.00 TEST_START: test_bar
+             0:00.00 TEST_END: Test OK. Subtests passed 1/1. Unexpected 0
+            KNOWN-INTERMITTENT-PASS a subtest
+             0:00.00 TEST_START: test_baz
+             0:00.00 TEST_END: FAIL
+             0:00.00 SUITE_END
+
+            suite 1
+            ~~~~~~~
+            Ran 4 checks (1 subtests, 3 tests)
+            Expected results: 4 (2 known intermittents)
+            Unexpected results: 0
+
+            Known Intermittent Results
+            --------------------------
+            test_foo
+              KNOWN-INTERMITTENT-FAIL test_foo
+            test_bar
+              KNOWN-INTERMITTENT-PASS a subtest
+            OK
+            """
+            ).lstrip("\n"),
+        ),
+        (
+            "mach",
+            {"verbose": True},
+            dedent(
+                """
+             0:00.00 SUITE_START: running 3 tests
+             0:00.00 TEST_START: test_foo
+             0:00.00 TEST_END: FAIL
+            KNOWN-INTERMITTENT-FAIL test_foo
+             0:00.00 TEST_START: test_bar
+             0:00.00 KNOWN-INTERMITTENT-PASS a subtest
+             0:00.00 TEST_END: Test OK. Subtests passed 1/1. Unexpected 0
+            KNOWN-INTERMITTENT-PASS a subtest
+             0:00.00 TEST_START: test_baz
+             0:00.00 TEST_END: FAIL
+             0:00.00 SUITE_END
+
+            suite 1
+            ~~~~~~~
+            Ran 4 checks (1 subtests, 3 tests)
+            Expected results: 4 (2 known intermittents)
+            Unexpected results: 0
+
+            Known Intermittent Results
+            --------------------------
+            test_foo
+              KNOWN-INTERMITTENT-FAIL test_foo
+            test_bar
+              KNOWN-INTERMITTENT-PASS a subtest
+            OK
+            """
+            ).lstrip("\n"),
+        ),
+    ],
+}
+
+
+def ids(test):
+    ids = []
+    for value in FORMATS[test]:
+        args = ", ".join(["{}={}".format(k, v) for k, v in value[1].items()])
+        if args:
+            args = "-{}".format(args)
+        ids.append("{}{}".format(value[0], args))
+    return ids
+
+
+@pytest.fixture(autouse=True)
+def timestamp(monkeypatch):
+    def fake_time(*args, **kwargs):
+        return 0
+
+    monkeypatch.setattr(MachFormatter, "_time", fake_time)
+
+
+@pytest.mark.parametrize("name,opts,expected", FORMATS["PASS"], ids=ids("PASS"))
+def test_pass(get_logger, name, opts, expected):
+    logger = get_logger(name, **opts)
+
+    logger.suite_start(["test_foo", "test_bar", "test_baz"])
+    logger.test_start("test_foo")
+    logger.test_end("test_foo", "OK")
+    logger.test_start("test_bar")
+    logger.test_status("test_bar", "a subtest", "PASS")
+    logger.test_end("test_bar", "OK")
+    logger.test_start("test_baz")
+    logger.test_end("test_baz", "FAIL", "FAIL", "expected 0 got 1")
+    logger.suite_end()
+
+    buf = logger.handlers[0].stream
+    result = buf.getvalue()
+    print("Dumping result for copy/paste:")
+    print(result)
+    assert result == expected
+
+
+@pytest.mark.parametrize("name,opts,expected", FORMATS["FAIL"], ids=ids("FAIL"))
+def test_fail(get_logger, name, opts, expected):
+    stack = """
+    SimpleTest.is@SimpleTest/SimpleTest.js:312:5
+    @caps/tests/mochitest/test_bug246699.html:53:1
+""".strip(
+        "\n"
+    )
+
+    logger = get_logger(name, **opts)
+
+    logger.suite_start(["test_foo", "test_bar", "test_baz"])
+    logger.test_start("test_foo")
+    logger.test_end("test_foo", "FAIL", "PASS", "expected 0 got 1")
+    logger.test_start("test_bar")
+    logger.test_status(
+        "test_bar", "a subtest", "FAIL", "PASS", "expected 0 got 1", stack
+    )
+    logger.test_status("test_bar", "another subtest", "TIMEOUT")
+    logger.test_end("test_bar", "OK")
+    logger.test_start("test_baz")
+    logger.test_end("test_baz", "PASS", "FAIL")
+    logger.suite_end()
+
+    buf = logger.handlers[0].stream
+    result = buf.getvalue()
+    print("Dumping result for copy/paste:")
+    print(result)
+    assert result == expected
+
+
+@pytest.mark.parametrize(
+    "name,opts,expected", FORMATS["PRECONDITION_FAILED"], ids=ids("PRECONDITION_FAILED")
+)
+def test_precondition_failed(get_logger, name, opts, expected):
+    logger = get_logger(name, **opts)
+
+    logger.suite_start(["test_foo", "test_bar"])
+    logger.test_start("test_foo")
+    logger.test_end("test_foo", "PRECONDITION_FAILED")
+    logger.test_start("test_bar")
+    logger.test_status("test_bar", "a subtest", "PASS")
+    logger.test_status("test_bar", "another subtest", "PRECONDITION_FAILED")
+    logger.test_end("test_bar", "OK")
+    logger.suite_end()
+
+    buf = logger.handlers[0].stream
+    result = buf.getvalue()
+    print("Dumping result for copy/paste:")
+    print(result)
+    assert result == expected
+
+
+@pytest.mark.parametrize(
+    "name,opts,expected", FORMATS["KNOWN-INTERMITTENT"], ids=ids("KNOWN-INTERMITTENT")
+)
+def test_known_intermittent(get_logger, name, opts, expected):
+    logger = get_logger(name, **opts)
+
+    logger.suite_start(["test_foo", "test_bar", "test_baz"])
+    logger.test_start("test_foo")
+    logger.test_end("test_foo", "FAIL", "PASS", known_intermittent=["FAIL"])
+    logger.test_start("test_bar")
+    logger.test_status(
+        "test_bar", "a subtest", "PASS", "FAIL", known_intermittent=["PASS"]
+    )
+    logger.test_end("test_bar", "OK")
+    logger.test_start("test_baz")
+    logger.test_end(
+        "test_baz", "FAIL", "FAIL", "expected 0 got 1", known_intermittent=["PASS"]
+    )
+    logger.suite_end()
+
+    buf = logger.handlers[0].stream
+    result = buf.getvalue()
+    print("Dumping result for copy/paste:")
+    print(result)
+    assert result == expected
+
+
+class FormatterTest(unittest.TestCase):
+    def setUp(self):
+        self.position = 0
+        self.logger = StructuredLogger("test_%s" % type(self).__name__)
+        self.output_file = StringIO()
+        self.handler = StreamHandler(self.output_file, self.get_formatter())
+        self.logger.add_handler(self.handler)
+
+    def set_position(self, pos=None):
+        if pos is None:
+            pos = self.output_file.tell()
+        self.position = pos
+
+    def get_formatter(self):
+        raise NotImplementedError(
+            "FormatterTest subclasses must implement get_formatter"
+        )
+
+    @property
+    def loglines(self):
+        self.output_file.seek(self.position)
+        return [ensure_text(line.rstrip()) for line in self.output_file.readlines()]
+
+
+class TestHTMLFormatter(FormatterTest):
+    def get_formatter(self):
+        return HTMLFormatter()
+
+    def test_base64_string(self):
+        self.logger.suite_start([])
+        self.logger.test_start("string_test")
+        self.logger.test_end("string_test", "FAIL", extra={"data": "foobar"})
+        self.logger.suite_end()
+        self.assertIn("data:text/html;charset=utf-8;base64,Zm9vYmFy", self.loglines[-3])
+
+    def test_base64_unicode(self):
+        self.logger.suite_start([])
+        self.logger.test_start("unicode_test")
+        self.logger.test_end("unicode_test", "FAIL", extra={"data": unichr(0x02A9)})
+        self.logger.suite_end()
+        self.assertIn("data:text/html;charset=utf-8;base64,yqk=", self.loglines[-3])
+
+    def test_base64_other(self):
+        self.logger.suite_start([])
+        self.logger.test_start("int_test")
+        self.logger.test_end("int_test", "FAIL", extra={"data": {"foo": "bar"}})
+        self.logger.suite_end()
+        self.assertIn(
+            "data:text/html;charset=utf-8;base64,eyJmb28iOiAiYmFyIn0=",
+            self.loglines[-3],
+        )
+
+
+class TestTBPLFormatter(FormatterTest):
+    def get_formatter(self):
+        return TbplFormatter()
+
+    def test_unexpected_message(self):
+        self.logger.suite_start([])
+        self.logger.test_start("timeout_test")
+        self.logger.test_end("timeout_test", "TIMEOUT", message="timed out")
+        self.assertIn(
+            "TEST-UNEXPECTED-TIMEOUT | timeout_test | timed out", self.loglines
+        )
+        self.logger.suite_end()
+
+    def test_default_unexpected_end_message(self):
+        self.logger.suite_start([])
+        self.logger.test_start("timeout_test")
+        self.logger.test_end("timeout_test", "TIMEOUT")
+        self.assertIn(
+            "TEST-UNEXPECTED-TIMEOUT | timeout_test | expected OK", self.loglines
+        )
+        self.logger.suite_end()
+
+    def test_default_unexpected_status_message(self):
+        self.logger.suite_start([])
+        self.logger.test_start("timeout_test")
+        self.logger.test_status("timeout_test", "subtest", status="TIMEOUT")
+        self.assertIn(
+            "TEST-UNEXPECTED-TIMEOUT | timeout_test | subtest - expected PASS",
+            self.loglines,
+        )
+        self.logger.test_end("timeout_test", "OK")
+        self.logger.suite_end()
+
+    def test_known_intermittent_end(self):
+        self.logger.suite_start([])
+        self.logger.test_start("intermittent_test")
+        self.logger.test_end(
+            "intermittent_test",
+            status="FAIL",
+            expected="PASS",
+            known_intermittent=["FAIL"],
+        )
+        # test_end log format:
+        # "TEST-KNOWN-INTERMITTENT-<STATUS> | <test> | took <duration>ms"
+        # where duration may be different each time
+        self.assertIn(
+            "TEST-KNOWN-INTERMITTENT-FAIL | intermittent_test | took ", self.loglines[2]
+        )
+        self.assertIn("ms", self.loglines[2])
+        self.logger.suite_end()
+
+    def test_known_intermittent_status(self):
+        self.logger.suite_start([])
+        self.logger.test_start("intermittent_test")
+        self.logger.test_status(
+            "intermittent_test",
+            "subtest",
+            status="FAIL",
+            expected="PASS",
+            known_intermittent=["FAIL"],
+        )
+        self.assertIn(
+            "TEST-KNOWN-INTERMITTENT-FAIL | intermittent_test | subtest", self.loglines
+        )
+        self.logger.test_end("intermittent_test", "OK")
+        self.logger.suite_end()
+
+    def test_single_newline(self):
+        self.logger.suite_start([])
+        self.logger.test_start("test1")
+        self.set_position()
+        self.logger.test_status("test1", "subtest", status="PASS", expected="FAIL")
+        self.logger.test_end("test1", "OK")
+        self.logger.suite_end()
+
+        # This sequence should not produce blanklines
+        for line in self.loglines:
+            self.assertNotEqual("", line)
+
+    def test_process_exit(self):
+        self.logger.process_exit(1234, 0)
+        self.assertIn("TEST-INFO | 1234: exit 0", self.loglines)
+
+    @unittest.skipUnless(os.name == "posix", "posix only")
+    def test_process_exit_with_sig(self):
+        # subprocess return code is negative when process
+        # has been killed by signal on posix.
+        self.logger.process_exit(1234, -signal.SIGTERM)
+        self.assertIn("TEST-INFO | 1234: killed by SIGTERM", self.loglines)
+
+
+class TestTBPLFormatterWithShutdown(FormatterTest):
+    def get_formatter(self):
+        return TbplFormatter(summary_on_shutdown=True)
+
+    def test_suite_summary_on_shutdown(self):
+        self.logger.suite_start([])
+        self.logger.test_start("summary_test")
+        self.logger.test_status(
+            "summary_test", "subtest", "FAIL", "PASS", known_intermittent=["FAIL"]
+        )
+        self.logger.test_end("summary_test", "FAIL", "OK", known_intermittent=["FAIL"])
+        self.logger.suite_end()
+        self.logger.shutdown()
+
+        self.assertIn("suite 1: 2/2 (2 known intermittent tests)", self.loglines)
+        self.assertIn("Known Intermittent tests:", self.loglines)
+        self.assertIn(
+            "TEST-KNOWN-INTERMITTENT-FAIL | summary_test | subtest", self.loglines
+        )
+
+
+class TestMachFormatter(FormatterTest):
+    def get_formatter(self):
+        return MachFormatter(disable_colors=True)
+
+    def test_summary(self):
+        self.logger.suite_start([])
+
+        # Some tests that pass
+        self.logger.test_start("test1")
+        self.logger.test_end("test1", status="PASS", expected="PASS")
+
+        self.logger.test_start("test2")
+        self.logger.test_end("test2", status="PASS", expected="TIMEOUT")
+
+        self.logger.test_start("test3")
+        self.logger.test_end("test3", status="FAIL", expected="PASS")
+
+        self.set_position()
+        self.logger.suite_end()
+
+        self.assertIn("Ran 3 checks (3 tests)", self.loglines)
+        self.assertIn("Expected results: 1", self.loglines)
+        self.assertIn(
+            """
+Unexpected results: 2
+  test: 2 (1 fail, 1 pass)
+""".strip(),
+            "\n".join(self.loglines),
+        )
+        self.assertNotIn("test1", self.loglines)
+        self.assertIn("UNEXPECTED-PASS test2", self.loglines)
+        self.assertIn("FAIL test3", self.loglines)
+
+    def test_summary_subtests(self):
+        self.logger.suite_start([])
+
+        self.logger.test_start("test1")
+        self.logger.test_status("test1", "subtest1", status="PASS")
+        self.logger.test_status("test1", "subtest2", status="FAIL")
+        self.logger.test_end("test1", status="OK", expected="OK")
+
+        self.logger.test_start("test2")
+        self.logger.test_status("test2", "subtest1", status="TIMEOUT", expected="PASS")
+        self.logger.test_end("test2", status="TIMEOUT", expected="OK")
+
+        self.set_position()
+        self.logger.suite_end()
+
+        self.assertIn("Ran 5 checks (3 subtests, 2 tests)", self.loglines)
+        self.assertIn("Expected results: 2", self.loglines)
+        self.assertIn(
+            """
+Unexpected results: 3
+  test: 1 (1 timeout)
+  subtest: 2 (1 fail, 1 timeout)
+""".strip(),
+            "\n".join(self.loglines),
+        )
+
+    def test_summary_ok(self):
+        self.logger.suite_start([])
+
+        self.logger.test_start("test1")
+        self.logger.test_status("test1", "subtest1", status="PASS")
+        self.logger.test_status("test1", "subtest2", status="PASS")
+        self.logger.test_end("test1", status="OK", expected="OK")
+
+        self.logger.test_start("test2")
+        self.logger.test_status("test2", "subtest1", status="PASS", expected="PASS")
+        self.logger.test_end("test2", status="OK", expected="OK")
+
+        self.set_position()
+        self.logger.suite_end()
+
+        self.assertIn("OK", self.loglines)
+        self.assertIn("Expected results: 5", self.loglines)
+        self.assertIn("Unexpected results: 0", self.loglines)
+
+    def test_process_start(self):
+        self.logger.process_start(1234)
+        self.assertIn("Started process `1234`", self.loglines[0])
+
+    def test_process_start_with_command(self):
+        self.logger.process_start(1234, command="test cmd")
+        self.assertIn("Started process `1234` (test cmd)", self.loglines[0])
+
+    def test_process_exit(self):
+        self.logger.process_exit(1234, 0)
+        self.assertIn("1234: exit 0", self.loglines[0])
+
+    @unittest.skipUnless(os.name == "posix", "posix only")
+    def test_process_exit_with_sig(self):
+        # subprocess return code is negative when process
+        # has been killed by signal on posix.
+        self.logger.process_exit(1234, -signal.SIGTERM)
+        self.assertIn("1234: killed by SIGTERM", self.loglines[0])
+
+
+class TestGroupingFormatter(FormatterTest):
+    def get_formatter(self):
+        return GroupingFormatter()
+
+    def test_results_total(self):
+        self.logger.suite_start([])
+
+        self.logger.test_start("test1")
+        self.logger.test_status("test1", "subtest1", status="PASS")
+        self.logger.test_status("test1", "subtest1", status="PASS")
+        self.logger.test_end("test1", status="OK")
+
+        self.logger.test_start("test2")
+        self.logger.test_status(
+            "test2",
+            "subtest2",
+            status="FAIL",
+            expected="PASS",
+            known_intermittent=["FAIL"],
+        )
+        self.logger.test_end("test2", status="FAIL", expected="OK")
+
+        self.set_position()
+        self.logger.suite_end()
+
+        self.assertIn("Ran 2 tests finished in 0.0 seconds.", self.loglines)
+        self.assertIn("  \u2022 1 ran as expected. 0 tests skipped.", self.loglines)
+        self.assertIn("  \u2022 1 known intermittent results.", self.loglines)
+        self.assertIn("  \u2022 1 tests failed unexpectedly", self.loglines)
+        self.assertIn("  \u25B6 FAIL [expected OK] test2", self.loglines)
+        self.assertIn(
+            "  \u25B6 FAIL [expected PASS, known intermittent [FAIL] test2, subtest2",
+            self.loglines,
+        )
+
+
+class TestXUnitFormatter(FormatterTest):
+    def get_formatter(self):
+        return XUnitFormatter()
+
+    def log_as_xml(self):
+        return ET.fromstring("\n".join(self.loglines))
+
+    def test_stacktrace_is_present(self):
+        self.logger.suite_start([])
+        self.logger.test_start("test1")
+        self.logger.test_end(
+            "test1", "fail", message="Test message", stack="this\nis\na\nstack"
+        )
+        self.logger.suite_end()
+
+        root = self.log_as_xml()
+        self.assertIn("this\nis\na\nstack", root.find("testcase/failure").text)
+
+    def test_failure_message(self):
+        self.logger.suite_start([])
+        self.logger.test_start("test1")
+        self.logger.test_end("test1", "fail", message="Test message")
+        self.logger.suite_end()
+
+        root = self.log_as_xml()
+        self.assertEqual(
+            "Expected OK, got FAIL", root.find("testcase/failure").get("message")
+        )
+
+    def test_suite_attrs(self):
+        self.logger.suite_start([])
+        self.logger.test_start("test1")
+        self.logger.test_end("test1", "ok", message="Test message")
+        self.logger.suite_end()
+
+        root = self.log_as_xml()
+        self.assertEqual(root.get("skips"), "0")
+        self.assertEqual(root.get("failures"), "0")
+        self.assertEqual(root.get("errors"), "0")
+        self.assertEqual(root.get("tests"), "1")
+
+    def test_time_is_not_rounded(self):
+        # call formatter directly, it is easier here
+        formatter = self.get_formatter()
+        formatter.suite_start(dict(time=55000))
+        formatter.test_start(dict(time=55100))
+        formatter.test_end(
+            dict(time=55558, test="id", message="message", status="PASS")
+        )
+        xml_string = formatter.suite_end(dict(time=55559))
+
+        root = ET.fromstring(xml_string)
+        self.assertEqual(root.get("time"), "0.56")
+        self.assertEqual(root.find("testcase").get("time"), "0.46")
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/testing/mozbase/mozlog/tests/test_logger.py b/testing/mozbase/mozlog/tests/test_logger.py
new file mode 100644
index 0000000000..0776d87000
--- /dev/null
+++ b/testing/mozbase/mozlog/tests/test_logger.py
@@ -0,0 +1,303 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import datetime
+import json
+import socket
+import threading
+import time
+import unittest
+
+import mozfile
+import mozlog.unstructured as mozlog
+import mozunit
+import six
+
+
+class ListHandler(mozlog.Handler):
+    """Mock handler appends messages to a list for later inspection."""
+
+    def __init__(self):
+        mozlog.Handler.__init__(self)
+        self.messages = []
+
+    def emit(self, record):
+        self.messages.append(self.format(record))
+
+
+class TestLogging(unittest.TestCase):
+    """Tests behavior of basic mozlog api."""
+
+    def test_logger_defaults(self):
+        """Tests the default logging format and behavior."""
+
+        default_logger = mozlog.getLogger("default.logger")
+        self.assertEqual(default_logger.name, "default.logger")
+        self.assertEqual(len(default_logger.handlers), 1)
+        self.assertTrue(isinstance(default_logger.handlers[0], mozlog.StreamHandler))
+
+        f = mozfile.NamedTemporaryFile()
+        list_logger = mozlog.getLogger(
+            "file.logger", handler=mozlog.FileHandler(f.name)
+        )
+        self.assertEqual(len(list_logger.handlers), 1)
+        self.assertTrue(isinstance(list_logger.handlers[0], mozlog.FileHandler))
+        f.close()
+
+        self.assertRaises(
+            ValueError, mozlog.getLogger, "file.logger", handler=ListHandler()
+        )
+
+    def test_timestamps(self):
+        """Verifies that timestamps are included when asked for."""
+        log_name = "test"
+        handler = ListHandler()
+        handler.setFormatter(mozlog.MozFormatter())
+        log = mozlog.getLogger(log_name, handler=handler)
+        log.info("no timestamp")
+        self.assertTrue(handler.messages[-1].startswith("%s " % log_name))
+        handler.setFormatter(mozlog.MozFormatter(include_timestamp=True))
+        log.info("timestamp")
+        # Just verify that this raises no exceptions.
+        datetime.datetime.strptime(handler.messages[-1][:23], "%Y-%m-%d %H:%M:%S,%f")
+
+
+class TestStructuredLogging(unittest.TestCase):
+    """Tests structured output in mozlog."""
+
+    def setUp(self):
+        self.handler = ListHandler()
+        self.handler.setFormatter(mozlog.JSONFormatter())
+        self.logger = mozlog.MozLogger("test.Logger")
+        self.logger.addHandler(self.handler)
+        self.logger.setLevel(mozlog.DEBUG)
+
+    def check_messages(self, expected, actual):
+        """Checks actual for equality with corresponding fields in actual.
+        The actual message should contain all fields in expected, and
+        should be identical, with the exception of the timestamp field.
+        The actual message should contain no fields other than the timestamp
+        field and those present in expected."""
+
+        self.assertTrue(isinstance(actual["_time"], six.integer_types))
+
+        for k, v in expected.items():
+            self.assertEqual(v, actual[k])
+
+        for k in actual.keys():
+            if k != "_time":
+                self.assertTrue(expected.get(k) is not None)
+
+    def test_structured_output(self):
+        self.logger.log_structured(
+            "test_message", {"_level": mozlog.INFO, "_message": "message one"}
+        )
+        self.logger.log_structured(
+            "test_message", {"_level": mozlog.INFO, "_message": "message two"}
+        )
+        self.logger.log_structured(
+            "error_message", {"_level": mozlog.ERROR, "diagnostic": "unexpected error"}
+        )
+
+        message_one_expected = {
+            "_namespace": "test.Logger",
+            "_level": "INFO",
+            "_message": "message one",
+            "action": "test_message",
+        }
+        message_two_expected = {
+            "_namespace": "test.Logger",
+            "_level": "INFO",
+            "_message": "message two",
+            "action": "test_message",
+        }
+        message_three_expected = {
+            "_namespace": "test.Logger",
+            "_level": "ERROR",
+            "diagnostic": "unexpected error",
+            "action": "error_message",
+        }
+
+        message_one_actual = json.loads(self.handler.messages[0])
+        message_two_actual = json.loads(self.handler.messages[1])
+        message_three_actual = json.loads(self.handler.messages[2])
+
+        self.check_messages(message_one_expected, message_one_actual)
+        self.check_messages(message_two_expected, message_two_actual)
+        self.check_messages(message_three_expected, message_three_actual)
+
+    def test_unstructured_conversion(self):
+        """Tests that logging to a logger with a structured formatter
+        via the traditional logging interface works as expected."""
+        self.logger.info("%s %s %d", "Message", "number", 1)
+        self.logger.error("Message number 2")
+        self.logger.debug(
+            "Message with %s",
+            "some extras",
+            extra={"params": {"action": "mozlog_test_output", "is_failure": False}},
+        )
+        message_one_expected = {
+            "_namespace": "test.Logger",
+            "_level": "INFO",
+            "_message": "Message number 1",
+        }
+        message_two_expected = {
+            "_namespace": "test.Logger",
+            "_level": "ERROR",
+            "_message": "Message number 2",
+        }
+        message_three_expected = {
+            "_namespace": "test.Logger",
+            "_level": "DEBUG",
+            "_message": "Message with some extras",
+            "action": "mozlog_test_output",
+            "is_failure": False,
+        }
+
+        message_one_actual = json.loads(self.handler.messages[0])
+        message_two_actual = json.loads(self.handler.messages[1])
+        message_three_actual = json.loads(self.handler.messages[2])
+
+        self.check_messages(message_one_expected, message_one_actual)
+        self.check_messages(message_two_expected, message_two_actual)
+        self.check_messages(message_three_expected, message_three_actual)
+
+    def message_callback(self):
+        if len(self.handler.messages) == 3:
+            message_one_expected = {
+                "_namespace": "test.Logger",
+                "_level": "DEBUG",
+                "_message": "socket message one",
+                "action": "test_message",
+            }
+            message_two_expected = {
+                "_namespace": "test.Logger",
+                "_level": "DEBUG",
+                "_message": "socket message two",
+                "action": "test_message",
+            }
+            message_three_expected = {
+                "_namespace": "test.Logger",
+                "_level": "DEBUG",
+                "_message": "socket message three",
+                "action": "test_message",
+            }
+
+            message_one_actual = json.loads(self.handler.messages[0])
+
+            message_two_actual = json.loads(self.handler.messages[1])
+
+            message_three_actual = json.loads(self.handler.messages[2])
+
+            self.check_messages(message_one_expected, message_one_actual)
+            self.check_messages(message_two_expected, message_two_actual)
+            self.check_messages(message_three_expected, message_three_actual)
+
+    def test_log_listener(self):
+        connection = "127.0.0.1", 0
+        self.log_server = mozlog.LogMessageServer(
+            connection, self.logger, message_callback=self.message_callback, timeout=0.5
+        )
+
+        message_string_one = json.dumps(
+            {
+                "_message": "socket message one",
+                "action": "test_message",
+                "_level": "DEBUG",
+            }
+        )
+        message_string_two = json.dumps(
+            {
+                "_message": "socket message two",
+                "action": "test_message",
+                "_level": "DEBUG",
+            }
+        )
+
+        message_string_three = json.dumps(
+            {
+                "_message": "socket message three",
+                "action": "test_message",
+                "_level": "DEBUG",
+            }
+        )
+
+        message_string = (
+            message_string_one
+            + "\n"
+            + message_string_two
+            + "\n"
+            + message_string_three
+            + "\n"
+        )
+
+        server_thread = threading.Thread(target=self.log_server.handle_request)
+        server_thread.start()
+
+        host, port = self.log_server.server_address
+
+        sock = socket.socket()
+        sock.connect((host, port))
+
+        # Sleeps prevent listener from receiving entire message in a single call
+        # to recv in order to test reconstruction of partial messages.
+        sock.sendall(message_string[:8].encode())
+        time.sleep(0.01)
+        sock.sendall(message_string[8:32].encode())
+        time.sleep(0.01)
+        sock.sendall(message_string[32:64].encode())
+        time.sleep(0.01)
+        sock.sendall(message_string[64:128].encode())
+        time.sleep(0.01)
+        sock.sendall(message_string[128:].encode())
+
+        server_thread.join()
+
+
+class Loggable(mozlog.LoggingMixin):
+    """Trivial class inheriting from LoggingMixin"""
+
+    pass
+
+
+class TestLoggingMixin(unittest.TestCase):
+    """Tests basic use of LoggingMixin"""
+
+    def test_mixin(self):
+        loggable = Loggable()
+        self.assertTrue(not hasattr(loggable, "_logger"))
+        loggable.log(mozlog.INFO, "This will instantiate the logger")
+        self.assertTrue(hasattr(loggable, "_logger"))
+        self.assertEqual(loggable._logger.name, "test_logger.Loggable")
+
+        self.assertRaises(ValueError, loggable.set_logger, "not a logger")
+
+        logger = mozlog.MozLogger("test.mixin")
+        handler = ListHandler()
+        logger.addHandler(handler)
+        loggable.set_logger(logger)
+        self.assertTrue(isinstance(loggable._logger.handlers[0], ListHandler))
+        self.assertEqual(loggable._logger.name, "test.mixin")
+
+        loggable.log(mozlog.WARN, 'message for "log" method')
+        loggable.info('message for "info" method')
+        loggable.error('message for "error" method')
+        loggable.log_structured(
+            "test_message",
+            params={"_message": "message for " + '"log_structured" method'},
+        )
+
+        expected_messages = [
+            'message for "log" method',
+            'message for "info" method',
+            'message for "error" method',
+            'message for "log_structured" method',
+        ]
+
+        actual_messages = loggable._logger.handlers[0].messages
+        self.assertEqual(expected_messages, actual_messages)
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/testing/mozbase/mozlog/tests/test_logtypes.py b/testing/mozbase/mozlog/tests/test_logtypes.py
new file mode 100644
index 0000000000..177d25cdb0
--- /dev/null
+++ b/testing/mozbase/mozlog/tests/test_logtypes.py
@@ -0,0 +1,106 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import unittest
+
+import mozunit
+from mozlog.logtypes import Any, Dict, Int, List, TestList, Tuple, Unicode
+
+
+class TestContainerTypes(unittest.TestCase):
+    def test_dict_type_basic(self):
+        d = Dict("name")
+        with self.assertRaises(ValueError):
+            d({"foo": "bar"})
+
+        d = Dict(Any, "name")
+        d({"foo": "bar"})  # doesn't raise
+
+    def test_dict_type_with_dictionary_item_type(self):
+        d = Dict({Int: Int}, "name")
+        with self.assertRaises(ValueError):
+            d({"foo": 1})
+
+        with self.assertRaises(ValueError):
+            d({1: "foo"})
+
+        d({1: 2})  # doesn't raise
+
+    def test_dict_type_with_recursive_item_types(self):
+        d = Dict(Dict({Unicode: List(Int)}), "name")
+        with self.assertRaises(ValueError):
+            d({"foo": "bar"})
+
+        with self.assertRaises(ValueError):
+            d({"foo": {"bar": "baz"}})
+
+        with self.assertRaises(ValueError):
+            d({"foo": {"bar": ["baz"]}})
+
+        d({"foo": {"bar": [1]}})  # doesn't raise
+
+    def test_list_type_basic(self):
+        l = List("name")
+        with self.assertRaises(ValueError):
+            l(["foo"])
+
+        l = List(Any, "name")
+        l(["foo", 1])  # doesn't raise
+
+    def test_list_type_with_recursive_item_types(self):
+        l = List(Dict(List(Tuple((Unicode, Int)))), "name")
+        with self.assertRaises(ValueError):
+            l(["foo"])
+
+        with self.assertRaises(ValueError):
+            l([{"foo": "bar"}])
+
+        with self.assertRaises(ValueError):
+            l([{"foo": ["bar"]}])
+
+        l([{"foo": [("bar", 1)]}])  # doesn't raise
+
+    def test_tuple_type_basic(self):
+        t = Tuple("name")
+        with self.assertRaises(ValueError):
+            t((1,))
+
+        t = Tuple(Any, "name")
+        t((1,))  # doesn't raise
+
+    def test_tuple_type_with_tuple_item_type(self):
+        t = Tuple((Unicode, Int))
+        with self.assertRaises(ValueError):
+            t(("foo", "bar"))
+
+        t(("foo", 1))  # doesn't raise
+
+    def test_tuple_type_with_recursive_item_types(self):
+        t = Tuple((Dict(List(Any)), List(Dict(Any)), Unicode), "name")
+        with self.assertRaises(ValueError):
+            t(({"foo": "bar"}, [{"foo": "bar"}], "foo"))
+
+        with self.assertRaises(ValueError):
+            t(({"foo": ["bar"]}, ["foo"], "foo"))
+
+        t(({"foo": ["bar"]}, [{"foo": "bar"}], "foo"))  # doesn't raise
+
+
+class TestDataTypes(unittest.TestCase):
+    def test_test_list(self):
+        t = TestList("name")
+        with self.assertRaises(ValueError):
+            t("foo")
+
+        with self.assertRaises(ValueError):
+            t({"foo": 1})
+
+        d1 = t({"default": ["bar"]})  # doesn't raise
+        d2 = t(["bar"])  # doesn't raise
+
+        self.assertDictContainsSubset(d1, d2)
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/testing/mozbase/mozlog/tests/test_structured.py b/testing/mozbase/mozlog/tests/test_structured.py
new file mode 100644
index 0000000000..8c4d2c2197
--- /dev/null
+++ b/testing/mozbase/mozlog/tests/test_structured.py
@@ -0,0 +1,1098 @@
+# -*- coding: utf-8 -*-
+
+import argparse
+import json
+import optparse
+import os
+import sys
+import unittest
+
+import mozfile
+import mozunit
+import six
+from mozlog import commandline, formatters, handlers, reader, stdadapter, structuredlog
+from six import StringIO
+
+
+class TestHandler(object):
+    def __init__(self):
+        self.items = []
+
+    def __call__(self, data):
+        self.items.append(data)
+
+    @property
+    def last_item(self):
+        return self.items[-1]
+
+    @property
+    def empty(self):
+        return not self.items
+
+
+class BaseStructuredTest(unittest.TestCase):
+    def setUp(self):
+        self.logger = structuredlog.StructuredLogger("test")
+        self.handler = TestHandler()
+        self.logger.add_handler(self.handler)
+
+    def pop_last_item(self):
+        return self.handler.items.pop()
+
+    def assert_log_equals(self, expected, actual=None):
+        if actual is None:
+            actual = self.pop_last_item()
+
+        all_expected = {"pid": os.getpid(), "thread": "MainThread", "source": "test"}
+        specials = set(["time"])
+
+        all_expected.update(expected)
+        for key, value in six.iteritems(all_expected):
+            self.assertEqual(actual[key], value)
+
+        self.assertEqual(set(all_expected.keys()) | specials, set(actual.keys()))
+
+
+class TestStatusHandler(BaseStructuredTest):
+    def setUp(self):
+        super(TestStatusHandler, self).setUp()
+        self.handler = handlers.StatusHandler()
+        self.logger.add_handler(self.handler)
+
+    def test_failure_run(self):
+        self.logger.suite_start([])
+        self.logger.test_start("test1")
+        self.logger.test_status("test1", "sub1", status="PASS")
+        self.logger.test_status("test1", "sub2", status="TIMEOUT")
+        self.logger.test_status(
+            "test1", "sub3", status="FAIL", expected="PASS", known_intermittent=["FAIL"]
+        )
+        self.logger.test_end("test1", status="OK")
+        self.logger.suite_end()
+        summary = self.handler.summarize()
+        self.assertIn("TIMEOUT", summary.unexpected_statuses)
+        self.assertEqual(1, summary.unexpected_statuses["TIMEOUT"])
+        self.assertIn("PASS", summary.expected_statuses)
+        self.assertEqual(1, summary.expected_statuses["PASS"])
+        self.assertIn("OK", summary.expected_statuses)
+        self.assertEqual(1, summary.expected_statuses["OK"])
+        self.assertIn("FAIL", summary.expected_statuses)
+        self.assertEqual(1, summary.expected_statuses["FAIL"])
+        self.assertIn("FAIL", summary.known_intermittent_statuses)
+        self.assertEqual(1, summary.known_intermittent_statuses["FAIL"])
+        self.assertEqual(3, summary.action_counts["test_status"])
+        self.assertEqual(1, summary.action_counts["test_end"])
+
+    def test_precondition_failed_run(self):
+        self.logger.suite_start([])
+        self.logger.test_start("test1")
+        self.logger.test_end("test1", status="PRECONDITION_FAILED")
+        self.logger.test_start("test2")
+        self.logger.test_status("test2", "sub1", status="PRECONDITION_FAILED")
+        self.logger.test_end("test2", status="OK")
+        self.logger.suite_end()
+        summary = self.handler.summarize()
+        self.assertEqual(1, summary.expected_statuses["OK"])
+        self.assertEqual(2, summary.unexpected_statuses["PRECONDITION_FAILED"])
+
+    def test_error_run(self):
+        self.logger.suite_start([])
+        self.logger.test_start("test1")
+        self.logger.error("ERRR!")
+        self.logger.test_end("test1", status="OK")
+        self.logger.test_start("test2")
+        self.logger.test_end("test2", status="OK")
+        self.logger.suite_end()
+        summary = self.handler.summarize()
+        self.assertIn("ERROR", summary.log_level_counts)
+        self.assertEqual(1, summary.log_level_counts["ERROR"])
+        self.assertIn("OK", summary.expected_statuses)
+        self.assertEqual(2, summary.expected_statuses["OK"])
+
+
+class TestSummaryHandler(BaseStructuredTest):
+    def setUp(self):
+        super(TestSummaryHandler, self).setUp()
+        self.handler = handlers.SummaryHandler()
+        self.logger.add_handler(self.handler)
+
+    def test_failure_run(self):
+        self.logger.suite_start([])
+        self.logger.test_start("test1")
+        self.logger.test_status("test1", "sub1", status="PASS")
+        self.logger.test_status("test1", "sub2", status="TIMEOUT")
+        self.logger.assertion_count("test1", 5, 1, 10)
+        self.logger.assertion_count("test1", 5, 10, 15)
+        self.logger.test_end("test1", status="OK")
+        self.logger.suite_end()
+
+        counts = self.handler.current["counts"]
+        self.assertIn("timeout", counts["subtest"]["unexpected"])
+        self.assertEqual(1, counts["subtest"]["unexpected"]["timeout"])
+        self.assertIn("pass", counts["subtest"]["expected"])
+        self.assertEqual(1, counts["subtest"]["expected"]["pass"])
+        self.assertIn("ok", counts["test"]["expected"])
+        self.assertEqual(1, counts["test"]["expected"]["ok"])
+        self.assertIn("pass", counts["assert"]["unexpected"])
+        self.assertEqual(1, counts["assert"]["unexpected"]["pass"])
+        self.assertIn("fail", counts["assert"]["expected"])
+        self.assertEqual(1, counts["assert"]["expected"]["fail"])
+
+        logs = self.handler.current["unexpected_logs"]
+        self.assertEqual(1, len(logs))
+        self.assertIn("test1", logs)
+        self.assertEqual(1, len(logs["test1"]))
+        self.assertEqual("sub2", logs["test1"][0]["subtest"])
+
+    def test_precondition_failed_run(self):
+        self.logger.suite_start([])
+        self.logger.test_start("test1")
+        self.logger.test_status("test1", "sub1", status="PASS")
+        self.logger.test_end("test1", status="PRECONDITION_FAILED")
+        self.logger.test_start("test2")
+        self.logger.test_status("test2", "sub1", status="PRECONDITION_FAILED")
+        self.logger.test_status("test2", "sub2", status="PRECONDITION_FAILED")
+        self.logger.test_end("test2", status="OK")
+        self.logger.suite_end()
+
+        counts = self.handler.current["counts"]
+        self.assertIn("precondition_failed", counts["test"]["unexpected"])
+        self.assertEqual(1, counts["test"]["unexpected"]["precondition_failed"])
+        self.assertIn("pass", counts["subtest"]["expected"])
+        self.assertEqual(1, counts["subtest"]["expected"]["pass"])
+        self.assertIn("ok", counts["test"]["expected"])
+        self.assertEqual(1, counts["test"]["expected"]["ok"])
+        self.assertIn("precondition_failed", counts["subtest"]["unexpected"])
+        self.assertEqual(2, counts["subtest"]["unexpected"]["precondition_failed"])
+
+
+class TestStructuredLog(BaseStructuredTest):
+    def test_suite_start(self):
+        self.logger.suite_start(["test"], "logtest")
+        self.assert_log_equals(
+            {"action": "suite_start", "name": "logtest", "tests": {"default": ["test"]}}
+        )
+        self.logger.suite_end()
+
+    def test_suite_end(self):
+        self.logger.suite_start([])
+        self.logger.suite_end()
+        self.assert_log_equals({"action": "suite_end"})
+
+    def test_start(self):
+        self.logger.suite_start([])
+        self.logger.test_start("test1")
+        self.assert_log_equals({"action": "test_start", "test": "test1"})
+
+        self.logger.test_start(("test1", "==", "test1-ref"), path="path/to/test")
+        self.assert_log_equals(
+            {
+                "action": "test_start",
+                "test": ("test1", "==", "test1-ref"),
+                "path": "path/to/test",
+            }
+        )
+        self.logger.suite_end()
+
+    def test_start_inprogress(self):
+        self.logger.suite_start([])
+        self.logger.test_start("test1")
+        self.logger.test_start("test1")
+        self.assert_log_equals(
+            {
+                "action": "log",
+                "message": "test_start for test1 logged while in progress.",
+                "level": "ERROR",
+            }
+        )
+        self.logger.suite_end()
+
+    def test_status(self):
+        self.logger.suite_start([])
+        self.logger.test_start("test1")
+        self.logger.test_status(
+            "test1", "subtest name", "fail", expected="FAIL", message="Test message"
+        )
+        self.assert_log_equals(
+            {
+                "action": "test_status",
+                "subtest": "subtest name",
+                "status": "FAIL",
+                "message": "Test message",
+                "test": "test1",
+            }
+        )
+        self.logger.test_end("test1", "OK")
+        self.logger.suite_end()
+
+    def test_status_1(self):
+        self.logger.suite_start([])
+        self.logger.test_start("test1")
+        self.logger.test_status("test1", "subtest name", "fail")
+        self.assert_log_equals(
+            {
+                "action": "test_status",
+                "subtest": "subtest name",
+                "status": "FAIL",
+                "expected": "PASS",
+                "test": "test1",
+            }
+        )
+        self.logger.test_end("test1", "OK")
+        self.logger.suite_end()
+
+    def test_status_2(self):
+        self.assertRaises(
+            ValueError,
+            self.logger.test_status,
+            "test1",
+            "subtest name",
+            "XXXUNKNOWNXXX",
+        )
+
+    def test_status_extra(self):
+        self.logger.suite_start([])
+        self.logger.test_start("test1")
+        self.logger.test_status(
+            "test1", "subtest name", "FAIL", expected="PASS", extra={"data": 42}
+        )
+        self.assert_log_equals(
+            {
+                "action": "test_status",
+                "subtest": "subtest name",
+                "status": "FAIL",
+                "expected": "PASS",
+                "test": "test1",
+                "extra": {"data": 42},
+            }
+        )
+        self.logger.test_end("test1", "OK")
+        self.logger.suite_end()
+
+    def test_status_stack(self):
+        self.logger.suite_start([])
+        self.logger.test_start("test1")
+        self.logger.test_status(
+            "test1",
+            "subtest name",
+            "FAIL",
+            expected="PASS",
+            stack="many\nlines\nof\nstack",
+        )
+        self.assert_log_equals(
+            {
+                "action": "test_status",
+                "subtest": "subtest name",
+                "status": "FAIL",
+                "expected": "PASS",
+                "test": "test1",
+                "stack": "many\nlines\nof\nstack",
+            }
+        )
+        self.logger.test_end("test1", "OK")
+        self.logger.suite_end()
+
+    def test_status_known_intermittent(self):
+        self.logger.suite_start([])
+        self.logger.test_start("test1")
+        self.logger.test_status(
+            "test1", "subtest name", "fail", known_intermittent=["FAIL"]
+        )
+        self.assert_log_equals(
+            {
+                "action": "test_status",
+                "subtest": "subtest name",
+                "status": "FAIL",
+                "expected": "PASS",
+                "known_intermittent": ["FAIL"],
+                "test": "test1",
+            }
+        )
+        self.logger.test_end("test1", "OK")
+        self.logger.suite_end()
+
+    def test_status_not_started(self):
+        self.logger.test_status("test_UNKNOWN", "subtest", "PASS")
+        self.assertTrue(
+            self.pop_last_item()["message"].startswith(
+                "test_status for test_UNKNOWN logged while not in progress. Logged with data: {"
+            )
+        )
+
+    def test_remove_optional_defaults(self):
+        self.logger.suite_start([])
+        self.logger.test_start("test1")
+        self.logger.test_status(
+            "test1", "subtest name", "fail", message=None, stack=None
+        )
+        self.assert_log_equals(
+            {
+                "action": "test_status",
+                "subtest": "subtest name",
+                "status": "FAIL",
+                "expected": "PASS",
+                "test": "test1",
+            }
+        )
+        self.logger.test_end("test1", "OK")
+        self.logger.suite_end()
+
+    def test_remove_optional_defaults_raw_log(self):
+        self.logger.log_raw({"action": "suite_start", "tests": [1], "name": None})
+        self.assert_log_equals({"action": "suite_start", "tests": {"default": ["1"]}})
+        self.logger.suite_end()
+
+    def test_end(self):
+        self.logger.suite_start([])
+        self.logger.test_start("test1")
+        self.logger.test_end("test1", "fail", message="Test message")
+        self.assert_log_equals(
+            {
+                "action": "test_end",
+                "status": "FAIL",
+                "expected": "OK",
+                "message": "Test message",
+                "test": "test1",
+            }
+        )
+        self.logger.suite_end()
+
+    def test_end_1(self):
+        self.logger.suite_start([])
+        self.logger.test_start("test1")
+        self.logger.test_end("test1", "PASS", expected="PASS", extra={"data": 123})
+        self.assert_log_equals(
+            {
+                "action": "test_end",
+                "status": "PASS",
+                "extra": {"data": 123},
+                "test": "test1",
+            }
+        )
+        self.logger.suite_end()
+
+    def test_end_2(self):
+        self.assertRaises(ValueError, self.logger.test_end, "test1", "XXXUNKNOWNXXX")
+
+    def test_end_stack(self):
+        self.logger.suite_start([])
+        self.logger.test_start("test1")
+        self.logger.test_end(
+            "test1", "PASS", expected="PASS", stack="many\nlines\nof\nstack"
+        )
+        self.assert_log_equals(
+            {
+                "action": "test_end",
+                "status": "PASS",
+                "test": "test1",
+                "stack": "many\nlines\nof\nstack",
+            }
+        )
+        self.logger.suite_end()
+
+    def test_end_no_start(self):
+        self.logger.test_end("test1", "PASS", expected="PASS")
+        self.assertTrue(
+            self.pop_last_item()["message"].startswith(
+                "test_end for test1 logged while not in progress. Logged with data: {"
+            )
+        )
+        self.logger.suite_end()
+
+    def test_end_twice(self):
+        self.logger.suite_start([])
+        self.logger.test_start("test2")
+        self.logger.test_end("test2", "PASS", expected="PASS")
+        self.assert_log_equals(
+            {"action": "test_end", "status": "PASS", "test": "test2"}
+        )
+        self.logger.test_end("test2", "PASS", expected="PASS")
+        last_item = self.pop_last_item()
+        self.assertEqual(last_item["action"], "log")
+        self.assertEqual(last_item["level"], "ERROR")
+        self.assertTrue(
+            last_item["message"].startswith(
+                "test_end for test2 logged while not in progress. Logged with data: {"
+            )
+        )
+        self.logger.suite_end()
+
+    def test_suite_start_twice(self):
+        self.logger.suite_start([])
+        self.assert_log_equals({"action": "suite_start", "tests": {"default": []}})
+        self.logger.suite_start([])
+        last_item = self.pop_last_item()
+        self.assertEqual(last_item["action"], "log")
+        self.assertEqual(last_item["level"], "ERROR")
+        self.logger.suite_end()
+
+    def test_suite_end_no_start(self):
+        self.logger.suite_start([])
+        self.assert_log_equals({"action": "suite_start", "tests": {"default": []}})
+        self.logger.suite_end()
+        self.assert_log_equals({"action": "suite_end"})
+        self.logger.suite_end()
+        last_item = self.pop_last_item()
+        self.assertEqual(last_item["action"], "log")
+        self.assertEqual(last_item["level"], "ERROR")
+
+    def test_multiple_loggers_suite_start(self):
+        logger1 = structuredlog.StructuredLogger("test")
+        self.logger.suite_start([])
+        logger1.suite_start([])
+        last_item = self.pop_last_item()
+        self.assertEqual(last_item["action"], "log")
+        self.assertEqual(last_item["level"], "ERROR")
+
+    def test_multiple_loggers_test_start(self):
+        logger1 = structuredlog.StructuredLogger("test")
+        self.logger.suite_start([])
+        self.logger.test_start("test")
+        logger1.test_start("test")
+        last_item = self.pop_last_item()
+        self.assertEqual(last_item["action"], "log")
+        self.assertEqual(last_item["level"], "ERROR")
+
+    def test_process(self):
+        self.logger.process_output(1234, "test output")
+        self.assert_log_equals(
+            {"action": "process_output", "process": "1234", "data": "test output"}
+        )
+
+    def test_process_start(self):
+        self.logger.process_start(1234)
+        self.assert_log_equals({"action": "process_start", "process": "1234"})
+
+    def test_process_exit(self):
+        self.logger.process_exit(1234, 0)
+        self.assert_log_equals(
+            {"action": "process_exit", "process": "1234", "exitcode": 0}
+        )
+
+    def test_log(self):
+        for level in ["critical", "error", "warning", "info", "debug"]:
+            getattr(self.logger, level)("message")
+            self.assert_log_equals(
+                {"action": "log", "level": level.upper(), "message": "message"}
+            )
+
+    def test_logging_adapter(self):
+        import logging
+
+        logging.basicConfig(level="DEBUG")
+        old_level = logging.root.getEffectiveLevel()
+        logging.root.setLevel("DEBUG")
+
+        std_logger = logging.getLogger("test")
+        std_logger.setLevel("DEBUG")
+
+        logger = stdadapter.std_logging_adapter(std_logger)
+
+        try:
+            for level in ["critical", "error", "warning", "info", "debug"]:
+                getattr(logger, level)("message")
+                self.assert_log_equals(
+                    {"action": "log", "level": level.upper(), "message": "message"}
+                )
+        finally:
+            logging.root.setLevel(old_level)
+
+    def test_add_remove_handlers(self):
+        handler = TestHandler()
+        self.logger.add_handler(handler)
+        self.logger.info("test1")
+
+        self.assert_log_equals({"action": "log", "level": "INFO", "message": "test1"})
+
+        self.assert_log_equals(
+            {"action": "log", "level": "INFO", "message": "test1"},
+            actual=handler.last_item,
+        )
+
+        self.logger.remove_handler(handler)
+        self.logger.info("test2")
+
+        self.assert_log_equals({"action": "log", "level": "INFO", "message": "test2"})
+
+        self.assert_log_equals(
+            {"action": "log", "level": "INFO", "message": "test1"},
+            actual=handler.last_item,
+        )
+
+    def test_wrapper(self):
+        file_like = structuredlog.StructuredLogFileLike(self.logger)
+
+        file_like.write("line 1")
+
+        self.assert_log_equals({"action": "log", "level": "INFO", "message": "line 1"})
+
+        file_like.write("line 2\n")
+
+        self.assert_log_equals({"action": "log", "level": "INFO", "message": "line 2"})
+
+        file_like.write("line 3\r")
+
+        self.assert_log_equals({"action": "log", "level": "INFO", "message": "line 3"})
+
+        file_like.write("line 4\r\n")
+
+        self.assert_log_equals({"action": "log", "level": "INFO", "message": "line 4"})
+
+    def test_shutdown(self):
+        # explicit shutdown
+        log = structuredlog.StructuredLogger("test 1")
+        log.add_handler(self.handler)
+        log.info("line 1")
+        self.assert_log_equals(
+            {"action": "log", "level": "INFO", "message": "line 1", "source": "test 1"}
+        )
+        log.shutdown()
+        self.assert_log_equals({"action": "shutdown", "source": "test 1"})
+        with self.assertRaises(structuredlog.LoggerShutdownError):
+            log.info("bad log")
+        with self.assertRaises(structuredlog.LoggerShutdownError):
+            log.log_raw({"action": "log", "level": "info", "message": "bad log"})
+
+        # shutdown still applies to new instances
+        del log
+        log = structuredlog.StructuredLogger("test 1")
+        with self.assertRaises(structuredlog.LoggerShutdownError):
+            log.info("bad log")
+
+        # context manager shutdown
+        with structuredlog.StructuredLogger("test 2") as log:
+            log.add_handler(self.handler)
+            log.info("line 2")
+            self.assert_log_equals(
+                {
+                    "action": "log",
+                    "level": "INFO",
+                    "message": "line 2",
+                    "source": "test 2",
+                }
+            )
+        self.assert_log_equals({"action": "shutdown", "source": "test 2"})
+
+        # shutdown prevents logging across instances
+        log1 = structuredlog.StructuredLogger("test 3")
+        log2 = structuredlog.StructuredLogger("test 3", component="bar")
+        log1.shutdown()
+        with self.assertRaises(structuredlog.LoggerShutdownError):
+            log2.info("line 3")
+
+
+class TestTypeConversions(BaseStructuredTest):
+    def test_raw(self):
+        self.logger.log_raw({"action": "suite_start", "tests": [1], "time": "1234"})
+        self.assert_log_equals(
+            {"action": "suite_start", "tests": {"default": ["1"]}, "time": 1234}
+        )
+        self.logger.suite_end()
+
+    def test_tuple(self):
+        self.logger.suite_start([])
+        if six.PY3:
+            self.logger.test_start(
+                (
+                    b"\xf0\x90\x8d\x84\xf0\x90\x8c\xb4\xf0\x90"
+                    b"\x8d\x83\xf0\x90\x8d\x84".decode(),
+                    42,
+                    u"\u16a4",
+                )
+            )
+        else:
+            self.logger.test_start(
+                (
+                    "\xf0\x90\x8d\x84\xf0\x90\x8c\xb4\xf0\x90"
+                    "\x8d\x83\xf0\x90\x8d\x84",
+                    42,
+                    u"\u16a4",
+                )
+            )
+        self.assert_log_equals(
+            {
+                "action": "test_start",
+                "test": (u"\U00010344\U00010334\U00010343\U00010344", u"42", u"\u16a4"),
+            }
+        )
+        self.logger.suite_end()
+
+    def test_non_string_messages(self):
+        self.logger.suite_start([])
+        self.logger.info(1)
+        self.assert_log_equals({"action": "log", "message": "1", "level": "INFO"})
+        self.logger.info([1, (2, "3"), "s", "s" + chr(255)])
+        if six.PY3:
+            self.assert_log_equals(
+                {
+                    "action": "log",
+                    "message": "[1, (2, '3'), 's', 's\xff']",
+                    "level": "INFO",
+                }
+            )
+        else:
+            self.assert_log_equals(
+                {
+                    "action": "log",
+                    "message": "[1, (2, '3'), 's', 's\\xff']",
+                    "level": "INFO",
+                }
+            )
+
+        self.logger.suite_end()
+
+    def test_utf8str_write(self):
+        with mozfile.NamedTemporaryFile() as logfile:
+            _fmt = formatters.TbplFormatter()
+            _handler = handlers.StreamHandler(logfile, _fmt)
+            self.logger.add_handler(_handler)
+            self.logger.suite_start([])
+            self.logger.info("☺")
+            logfile.seek(0)
+            data = logfile.readlines()[-1].strip()
+            if six.PY3:
+                self.assertEqual(data.decode(), "☺")
+            else:
+                self.assertEqual(data, "☺")
+            self.logger.suite_end()
+            self.logger.remove_handler(_handler)
+
+    def test_arguments(self):
+        self.logger.info(message="test")
+        self.assert_log_equals({"action": "log", "message": "test", "level": "INFO"})
+
+        self.logger.suite_start([], run_info={})
+        self.assert_log_equals(
+            {"action": "suite_start", "tests": {"default": []}, "run_info": {}}
+        )
+        self.logger.test_start(test="test1")
+        self.logger.test_status("subtest1", "FAIL", test="test1", status="PASS")
+        self.assert_log_equals(
+            {
+                "action": "test_status",
+                "test": "test1",
+                "subtest": "subtest1",
+                "status": "PASS",
+                "expected": "FAIL",
+            }
+        )
+        self.logger.process_output(123, "data", "test")
+        self.assert_log_equals(
+            {
+                "action": "process_output",
+                "process": "123",
+                "command": "test",
+                "data": "data",
+            }
+        )
+        self.assertRaises(
+            TypeError,
+            self.logger.test_status,
+            subtest="subtest2",
+            status="FAIL",
+            expected="PASS",
+        )
+        self.assertRaises(
+            TypeError,
+            self.logger.test_status,
+            "test1",
+            "subtest1",
+            "PASS",
+            "FAIL",
+            "message",
+            "stack",
+            {},
+            [],
+            None,
+            "unexpected",
+        )
+        self.assertRaises(TypeError, self.logger.test_status, "test1", test="test2")
+        self.logger.suite_end()
+
+
+class TestComponentFilter(BaseStructuredTest):
+    def test_filter_component(self):
+        component_logger = structuredlog.StructuredLogger(
+            self.logger.name, "test_component"
+        )
+        component_logger.component_filter = handlers.LogLevelFilter(lambda x: x, "info")
+
+        self.logger.debug("Test")
+        self.assertFalse(self.handler.empty)
+        self.assert_log_equals({"action": "log", "level": "DEBUG", "message": "Test"})
+        self.assertTrue(self.handler.empty)
+
+        component_logger.info("Test 1")
+        self.assertFalse(self.handler.empty)
+        self.assert_log_equals(
+            {
+                "action": "log",
+                "level": "INFO",
+                "message": "Test 1",
+                "component": "test_component",
+            }
+        )
+
+        component_logger.debug("Test 2")
+        self.assertTrue(self.handler.empty)
+
+        component_logger.component_filter = None
+
+        component_logger.debug("Test 3")
+        self.assertFalse(self.handler.empty)
+        self.assert_log_equals(
+            {
+                "action": "log",
+                "level": "DEBUG",
+                "message": "Test 3",
+                "component": "test_component",
+            }
+        )
+
+    def test_filter_default_component(self):
+        component_logger = structuredlog.StructuredLogger(
+            self.logger.name, "test_component"
+        )
+
+        self.logger.debug("Test")
+        self.assertFalse(self.handler.empty)
+        self.assert_log_equals({"action": "log", "level": "DEBUG", "message": "Test"})
+
+        self.logger.component_filter = handlers.LogLevelFilter(lambda x: x, "info")
+
+        self.logger.debug("Test 1")
+        self.assertTrue(self.handler.empty)
+
+        component_logger.debug("Test 2")
+        self.assertFalse(self.handler.empty)
+        self.assert_log_equals(
+            {
+                "action": "log",
+                "level": "DEBUG",
+                "message": "Test 2",
+                "component": "test_component",
+            }
+        )
+
+        self.logger.component_filter = None
+
+        self.logger.debug("Test 3")
+        self.assertFalse(self.handler.empty)
+        self.assert_log_equals({"action": "log", "level": "DEBUG", "message": "Test 3"})
+
+    def test_filter_message_mutuate(self):
+        def filter_mutate(msg):
+            if msg["action"] == "log":
+                msg["message"] = "FILTERED! %s" % msg["message"]
+            return msg
+
+        self.logger.component_filter = filter_mutate
+        self.logger.debug("Test")
+        self.assert_log_equals(
+            {"action": "log", "level": "DEBUG", "message": "FILTERED! Test"}
+        )
+        self.logger.component_filter = None
+
+
+class TestCommandline(unittest.TestCase):
+    def setUp(self):
+        self.logfile = mozfile.NamedTemporaryFile()
+
+    @property
+    def loglines(self):
+        self.logfile.seek(0)
+        return [line.rstrip() for line in self.logfile.readlines()]
+
+    def test_setup_logging(self):
+        parser = argparse.ArgumentParser()
+        commandline.add_logging_group(parser)
+        args = parser.parse_args(["--log-raw=-"])
+        logger = commandline.setup_logging("test_setup_logging", args, {})
+        self.assertEqual(len(logger.handlers), 1)
+
+    def test_setup_logging_optparse(self):
+        parser = optparse.OptionParser()
+        commandline.add_logging_group(parser)
+        args, _ = parser.parse_args(["--log-raw=-"])
+        logger = commandline.setup_logging("test_optparse", args, {})
+        self.assertEqual(len(logger.handlers), 1)
+        self.assertIsInstance(logger.handlers[0], handlers.StreamHandler)
+
+    def test_limit_formatters(self):
+        parser = argparse.ArgumentParser()
+        commandline.add_logging_group(parser, include_formatters=["raw"])
+        other_formatters = [fmt for fmt in commandline.log_formatters if fmt != "raw"]
+        # check that every formatter except raw is not present
+        for fmt in other_formatters:
+            with self.assertRaises(SystemExit):
+                parser.parse_args(["--log-%s=-" % fmt])
+            with self.assertRaises(SystemExit):
+                parser.parse_args(["--log-%s-level=error" % fmt])
+        # raw is still ok
+        args = parser.parse_args(["--log-raw=-"])
+        logger = commandline.setup_logging("test_setup_logging2", args, {})
+        self.assertEqual(len(logger.handlers), 1)
+
+    def test_setup_logging_optparse_unicode(self):
+        parser = optparse.OptionParser()
+        commandline.add_logging_group(parser)
+        args, _ = parser.parse_args([u"--log-raw=-"])
+        logger = commandline.setup_logging("test_optparse_unicode", args, {})
+        self.assertEqual(len(logger.handlers), 1)
+        self.assertEqual(logger.handlers[0].stream, sys.stdout)
+        self.assertIsInstance(logger.handlers[0], handlers.StreamHandler)
+
+    def test_logging_defaultlevel(self):
+        parser = argparse.ArgumentParser()
+        commandline.add_logging_group(parser)
+
+        args = parser.parse_args(["--log-tbpl=%s" % self.logfile.name])
+        logger = commandline.setup_logging("test_fmtopts", args, {})
+        logger.info("INFO message")
+        logger.debug("DEBUG message")
+        logger.error("ERROR message")
+        # The debug level is not logged by default.
+        self.assertEqual([b"INFO message", b"ERROR message"], self.loglines)
+
+    def test_logging_errorlevel(self):
+        parser = argparse.ArgumentParser()
+        commandline.add_logging_group(parser)
+        args = parser.parse_args(
+            ["--log-tbpl=%s" % self.logfile.name, "--log-tbpl-level=error"]
+        )
+        logger = commandline.setup_logging("test_fmtopts", args, {})
+        logger.info("INFO message")
+        logger.debug("DEBUG message")
+        logger.error("ERROR message")
+
+        # Only the error level and above were requested.
+        self.assertEqual([b"ERROR message"], self.loglines)
+
+    def test_logging_debuglevel(self):
+        parser = argparse.ArgumentParser()
+        commandline.add_logging_group(parser)
+        args = parser.parse_args(
+            ["--log-tbpl=%s" % self.logfile.name, "--log-tbpl-level=debug"]
+        )
+        logger = commandline.setup_logging("test_fmtopts", args, {})
+        logger.info("INFO message")
+        logger.debug("DEBUG message")
+        logger.error("ERROR message")
+        # Requesting a lower log level than default works as expected.
+        self.assertEqual(
+            [b"INFO message", b"DEBUG message", b"ERROR message"], self.loglines
+        )
+
+    def test_unused_options(self):
+        parser = argparse.ArgumentParser()
+        commandline.add_logging_group(parser)
+        args = parser.parse_args(["--log-tbpl-level=error"])
+        self.assertRaises(
+            ValueError, commandline.setup_logging, "test_fmtopts", args, {}
+        )
+
+
+class TestBuffer(BaseStructuredTest):
+    def assert_log_equals(self, expected, actual=None):
+        if actual is None:
+            actual = self.pop_last_item()
+
+        all_expected = {
+            "pid": os.getpid(),
+            "thread": "MainThread",
+            "source": "testBuffer",
+        }
+        specials = set(["time"])
+
+        all_expected.update(expected)
+        for key, value in six.iteritems(all_expected):
+            self.assertEqual(actual[key], value)
+
+        self.assertEqual(set(all_expected.keys()) | specials, set(actual.keys()))
+
+    def setUp(self):
+        self.logger = structuredlog.StructuredLogger("testBuffer")
+        self.handler = handlers.BufferHandler(TestHandler(), message_limit=4)
+        self.logger.add_handler(self.handler)
+
+    def tearDown(self):
+        self.logger.remove_handler(self.handler)
+
+    def pop_last_item(self):
+        return self.handler.inner.items.pop()
+
+    def test_buffer_messages(self):
+        self.logger.suite_start([])
+        self.logger.test_start("test1")
+        self.logger.send_message("buffer", "off")
+        self.logger.test_status("test1", "sub1", status="PASS")
+        # Even for buffered actions, the buffer does not interfere if
+        # buffering is turned off.
+        self.assert_log_equals(
+            {
+                "action": "test_status",
+                "test": "test1",
+                "status": "PASS",
+                "subtest": "sub1",
+            }
+        )
+        self.logger.send_message("buffer", "on")
+        self.logger.test_status("test1", "sub2", status="PASS")
+        self.logger.test_status("test1", "sub3", status="PASS")
+        self.logger.test_status("test1", "sub4", status="PASS")
+        self.logger.test_status("test1", "sub5", status="PASS")
+        self.logger.test_status("test1", "sub6", status="PASS")
+        self.logger.test_status("test1", "sub7", status="PASS")
+        self.logger.test_end("test1", status="OK")
+        self.logger.send_message("buffer", "clear")
+        self.assert_log_equals({"action": "test_end", "test": "test1", "status": "OK"})
+        self.logger.suite_end()
+
+    def test_buffer_size(self):
+        self.logger.suite_start([])
+        self.logger.test_start("test1")
+        self.logger.test_status("test1", "sub1", status="PASS")
+        self.logger.test_status("test1", "sub2", status="PASS")
+        self.logger.test_status("test1", "sub3", status="PASS")
+        self.logger.test_status("test1", "sub4", status="PASS")
+        self.logger.test_status("test1", "sub5", status="PASS")
+        self.logger.test_status("test1", "sub6", status="PASS")
+        self.logger.test_status("test1", "sub7", status="PASS")
+
+        # No test status messages made it to the underlying handler.
+        self.assert_log_equals({"action": "test_start", "test": "test1"})
+
+        # The buffer's actual size never grows beyond the specified limit.
+        self.assertEqual(len(self.handler._buffer), 4)
+
+        self.logger.test_status("test1", "sub8", status="FAIL")
+        # The number of messages deleted comes back in a list.
+        self.assertEqual([4], self.logger.send_message("buffer", "flush"))
+
+        # When the buffer is dumped, the failure is the last thing logged
+        self.assert_log_equals(
+            {
+                "action": "test_status",
+                "test": "test1",
+                "subtest": "sub8",
+                "status": "FAIL",
+                "expected": "PASS",
+            }
+        )
+        # Three additional messages should have been retained for context
+        self.assert_log_equals(
+            {
+                "action": "test_status",
+                "test": "test1",
+                "status": "PASS",
+                "subtest": "sub7",
+            }
+        )
+        self.assert_log_equals(
+            {
+                "action": "test_status",
+                "test": "test1",
+                "status": "PASS",
+                "subtest": "sub6",
+            }
+        )
+        self.assert_log_equals(
+            {
+                "action": "test_status",
+                "test": "test1",
+                "status": "PASS",
+                "subtest": "sub5",
+            }
+        )
+        self.assert_log_equals({"action": "suite_start", "tests": {"default": []}})
+
+
+class TestReader(unittest.TestCase):
+    def to_file_like(self, obj):
+        data_str = "\n".join(json.dumps(item) for item in obj)
+        return StringIO(data_str)
+
+    def test_read(self):
+        data = [
+            {"action": "action_0", "data": "data_0"},
+            {"action": "action_1", "data": "data_1"},
+        ]
+
+        f = self.to_file_like(data)
+        self.assertEqual(data, list(reader.read(f)))
+
+    def test_imap_log(self):
+        data = [
+            {"action": "action_0", "data": "data_0"},
+            {"action": "action_1", "data": "data_1"},
+        ]
+
+        f = self.to_file_like(data)
+
+        def f_action_0(item):
+            return ("action_0", item["data"])
+
+        def f_action_1(item):
+            return ("action_1", item["data"])
+
+        res_iter = reader.imap_log(
+            reader.read(f), {"action_0": f_action_0, "action_1": f_action_1}
+        )
+        self.assertEqual(
+            [("action_0", "data_0"), ("action_1", "data_1")], list(res_iter)
+        )
+
+    def test_each_log(self):
+        data = [
+            {"action": "action_0", "data": "data_0"},
+            {"action": "action_1", "data": "data_1"},
+        ]
+
+        f = self.to_file_like(data)
+
+        count = {"action_0": 0, "action_1": 0}
+
+        def f_action_0(item):
+            count[item["action"]] += 1
+
+        def f_action_1(item):
+            count[item["action"]] += 2
+
+        reader.each_log(
+            reader.read(f), {"action_0": f_action_0, "action_1": f_action_1}
+        )
+
+        self.assertEqual({"action_0": 1, "action_1": 2}, count)
+
+    def test_handler(self):
+        data = [
+            {"action": "action_0", "data": "data_0"},
+            {"action": "action_1", "data": "data_1"},
+        ]
+
+        f = self.to_file_like(data)
+
+        test = self
+
+        class ReaderTestHandler(reader.LogHandler):
+            def __init__(self):
+                self.action_0_count = 0
+                self.action_1_count = 0
+
+            def action_0(self, item):
+                test.assertEqual(item["action"], "action_0")
+                self.action_0_count += 1
+
+            def action_1(self, item):
+                test.assertEqual(item["action"], "action_1")
+                self.action_1_count += 1
+
+        handler = ReaderTestHandler()
+        reader.handle_log(reader.read(f), handler)
+
+        self.assertEqual(handler.action_0_count, 1)
+        self.assertEqual(handler.action_1_count, 1)
+
+
+if __name__ == "__main__":
+    mozunit.main()
diff --git a/testing/mozbase/mozlog/tests/test_terminal_colors.py b/testing/mozbase/mozlog/tests/test_terminal_colors.py
new file mode 100644
index 0000000000..2dd72b7d53
--- /dev/null
+++ b/testing/mozbase/mozlog/tests/test_terminal_colors.py
@@ -0,0 +1,62 @@
+# encoding: utf-8
+
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+import sys
+from io import StringIO
+
+import mozunit
+import pytest
+from mozterm import Terminal
+
+
+@pytest.fixture
+def terminal():
+    blessed = pytest.importorskip("blessed")
+
+    kind = "xterm-256color"
+    try:
+        term = Terminal(stream=StringIO(), force_styling=True, kind=kind)
+    except blessed.curses.error:
+        pytest.skip("terminal '{}' not found".format(kind))
+
+    return term
+
+
+EXPECTED_DICT = {
+    "log_test_status_fail": "\x1b[31mlog_test_status_fail\x1b(B\x1b[m",
+    "log_process_output": "\x1b[34mlog_process_output\x1b(B\x1b[m",
+    "log_test_status_pass": "\x1b[32mlog_test_status_pass\x1b(B\x1b[m",
+    "log_test_status_unexpected_fail": "\x1b[31mlog_test_status_unexpected_fail\x1b(B\x1b[m",
+    "log_test_status_known_intermittent": "\x1b[33mlog_test_status_known_intermittent\x1b(B\x1b[m",
+    "time": "\x1b[36mtime\x1b(B\x1b[m",
+    "action": "\x1b[33maction\x1b(B\x1b[m",
+    "pid": "\x1b[36mpid\x1b(B\x1b[m",
+    "heading": "\x1b[1m\x1b[33mheading\x1b(B\x1b[m",
+    "sub_heading": "\x1b[33msub_heading\x1b(B\x1b[m",
+    "error": "\x1b[31merror\x1b(B\x1b[m",
+    "warning": "\x1b[33mwarning\x1b(B\x1b[m",
+    "bold": "\x1b[1mbold\x1b(B\x1b[m",
+    "grey": "\x1b[38;2;190;190;190mgrey\x1b(B\x1b[m",
+    "normal": "\x1b[90mnormal\x1b(B\x1b[m",
+    "bright_black": "\x1b[90mbright_black\x1b(B\x1b[m",
+}
+
+
+@pytest.mark.skipif(
+    not sys.platform.startswith("win"),
+    reason="Only do ANSI Escape Sequence comparisons on Windows.",
+)
+def test_terminal_colors(terminal):
+    from mozlog.formatters.machformatter import TerminalColors, color_dict
+
+    actual_dict = TerminalColors(terminal, color_dict)
+
+    for key in color_dict:
+        assert getattr(actual_dict, key)(key) == EXPECTED_DICT[key]
+
+
+if __name__ == "__main__":
+    mozunit.main()
-- 
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