browser.js

/**
 * @license
 * Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
 * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
 * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
 * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
 * Code distributed by Google as part of the polymer project is also
 * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 */
 
/**
 * THIS FILE IS AUTOMATICALLY GENERATED! 
 * To make changes to browser.js, please edit the source files in the repo's `browser/` directory!
 */

(function () {
'use strict';

window.__wctUseNpm = false;
/**
 * @license
 * Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
 * This code may only be used under the BSD style license found at
 * http://polymer.github.io/LICENSE.txt The complete set of authors may be found
 * at http://polymer.github.io/AUTHORS.txt The complete set of contributors may
 * be found at http://polymer.github.io/CONTRIBUTORS.txt Code distributed by
 * Google as part of the polymer project is also subject to an additional IP
 * rights grant found at http://polymer.github.io/PATENTS.txt
 */
// Make sure that we use native timers, in case they're being stubbed out.
var nativeSetInterval = window.setInterval;
var nativeSetTimeout = window.setTimeout;
var nativeRequestAnimationFrame = window.requestAnimationFrame;
/**
 * Runs `stepFn`, catching any error and passing it to `callback` (Node-style).
 * Otherwise, calls `callback` with no arguments on success.
 *
 * @param {function()} callback
 * @param {function()} stepFn
 */
function safeStep(callback, stepFn) {
    var err;
    try {
        stepFn();
    }
    catch (error) {
        err = error;
    }
    callback(err);
}
/**
 * Runs your test at declaration time (before Mocha has begun tests). Handy for
 * when you need to test document initialization.
 *
 * Be aware that any errors thrown asynchronously cannot be tied to your test.
 * You may want to catch them and pass them to the done event, instead. See
 * `safeStep`.
 *
 * @param {string} name The name of the test.
 * @param {function(?function())} testFn The test function. If an argument is
 *     accepted, the test will be treated as async, just like Mocha tests.
 */
function testImmediate(name, testFn) {
    if (testFn.length > 0) {
        return testImmediateAsync(name, testFn);
    }
    var err;
    try {
        testFn();
    }
    catch (error) {
        err = error;
    }
    test(name, function (done) {
        done(err);
    });
}
/**
 * An async-only variant of `testImmediate`.
 *
 * @param {string} name
 * @param {function(?function())} testFn
 */
function testImmediateAsync(name, testFn) {
    var testComplete = false;
    var err;
    test(name, function (done) {
        var intervalId = nativeSetInterval(function () {
            if (!testComplete)
                return;
            clearInterval(intervalId);
            done(err);
        }, 10);
    });
    try {
        testFn(function (error) {
            if (error)
                err = error;
            testComplete = true;
        });
    }
    catch (error) {
        err = error;
        testComplete = true;
    }
}
/**
 * Triggers a flush of any pending events, observations, etc and calls you back
 * after they have been processed.
 *
 * @param {function()} callback
 */
function flush(callback) {
    // Ideally, this function would be a call to Polymer.dom.flush, but that
    // doesn't support a callback yet
    // (https://github.com/Polymer/polymer-dev/issues/851),
    // ...and there's cross-browser flakiness to deal with.
    // Make sure that we're invoking the callback with no arguments so that the
    // caller can pass Mocha callbacks, etc.
    var done = function done() {
        callback();
    };
    // Because endOfMicrotask is flaky for IE, we perform microtask checkpoints
    // ourselves (https://github.com/Polymer/polymer-dev/issues/114):
    var isIE = navigator.appName === 'Microsoft Internet Explorer';
    if (isIE && window.Platform && window.Platform.performMicrotaskCheckpoint) {
        var reallyDone_1 = done;
        done = function doneIE() {
            Platform.performMicrotaskCheckpoint();
            nativeSetTimeout(reallyDone_1, 0);
        };
    }
    // Everyone else gets a regular flush.
    var scope;
    if (window.Polymer && window.Polymer.dom && window.Polymer.dom.flush) {
        scope = window.Polymer.dom;
    }
    else if (window.Polymer && window.Polymer.flush) {
        scope = window.Polymer;
    }
    else if (window.WebComponents && window.WebComponents.flush) {
        scope = window.WebComponents;
    }
    if (scope) {
        scope.flush();
    }
    // Ensure that we are creating a new _task_ to allow all active microtasks to
    // finish (the code you're testing may be using endOfMicrotask, too).
    nativeSetTimeout(done, 0);
}
/**
 * Advances a single animation frame.
 *
 * Calls `flush`, `requestAnimationFrame`, `flush`, and `callback` sequentially
 * @param {function()} callback
 */
function animationFrameFlush(callback) {
    flush(function () {
        nativeRequestAnimationFrame(function () {
            flush(callback);
        });
    });
}
/**
 * DEPRECATED: Use `flush`.
 * @param {function} callback
 */
function asyncPlatformFlush(callback) {
    console.warn('asyncPlatformFlush is deprecated in favor of the more terse flush()');
    return window.flush(callback);
}
/**
 *
 */
function waitFor(fn, next, intervalOrMutationEl, timeout, timeoutTime) {
    timeoutTime = timeoutTime || Date.now() + (timeout || 1000);
    intervalOrMutationEl = intervalOrMutationEl || 32;
    try {
        fn();
    }
    catch (e) {
        if (Date.now() > timeoutTime) {
            throw e;
        }
        else {
            if (typeof intervalOrMutationEl !== 'number') {
                intervalOrMutationEl.onMutation(intervalOrMutationEl, function () {
                    waitFor(fn, next, intervalOrMutationEl, timeout, timeoutTime);
                });
            }
            else {
                nativeSetTimeout(function () {
                    waitFor(fn, next, intervalOrMutationEl, timeout, timeoutTime);
                }, intervalOrMutationEl);
            }
            return;
        }
    }
    next();
}
window.safeStep = safeStep;
window.testImmediate = testImmediate;
window.testImmediateAsync = testImmediateAsync;
window.flush = flush;
window.animationFrameFlush = animationFrameFlush;
window.asyncPlatformFlush = asyncPlatformFlush;
window.waitFor = waitFor;

/**
 * The global configuration state for WCT's browser client.
 */
var _config = {
    environmentScripts: !!window.__wctUseNpm ?
        [
            'stacky/browser.js', 'async/lib/async.js', 'lodash/index.js',
            'mocha/mocha.js', 'chai/chai.js', '@polymer/sinonjs/sinon.js',
            'sinon-chai/lib/sinon-chai.js',
            'accessibility-developer-tools/dist/js/axs_testing.js',
            '@polymer/test-fixture/test-fixture.js'
        ] :
        [
            'stacky/browser.js', 'async/lib/async.js', 'lodash/lodash.js',
            'mocha/mocha.js', 'chai/chai.js', 'sinonjs/sinon.js',
            'sinon-chai/lib/sinon-chai.js',
            'accessibility-developer-tools/dist/js/axs_testing.js'
        ],
    environmentImports: !!window.__wctUseNpm ? [] :
        ['test-fixture/test-fixture.html'],
    root: null,
    waitForFrameworks: true,
    waitFor: null,
    numConcurrentSuites: 1,
    trackConsoleError: true,
    mochaOptions: { timeout: 10 * 1000 },
    verbose: false,
};
/**
 * Merges initial `options` into WCT's global configuration.
 *
 * @param {Object} options The options to merge. See `browser/config.js` for a
 *     reference.
 */
function setup(options) {
    var childRunner = ChildRunner.current();
    if (childRunner) {
        _deepMerge(_config, childRunner.parentScope.WCT._config);
        // But do not force the mocha UI
        delete _config.mochaOptions.ui;
    }
    if (options && typeof options === 'object') {
        _deepMerge(_config, options);
    }
    if (!_config.root) {
        // Sibling dependencies.
        var root = scriptPrefix('browser.js');
        _config.root = basePath(root.substr(0, root.length - 1));
        if (!_config.root) {
            throw new Error('Unable to detect root URL for WCT sources. Please set WCT.root before including browser.js');
        }
    }
}
/**
 * Retrieves a configuration value.
 */
function get(key) {
    return _config[key];
}
// Internal
function _deepMerge(target, source) {
    Object.keys(source).forEach(function (key) {
        if (target[key] !== null && typeof target[key] === 'object' &&
            !Array.isArray(target[key])) {
            _deepMerge(target[key], source[key]);
        }
        else {
            target[key] = source[key];
        }
    });
}

/**
 * @param {function()} callback A function to call when the active web component
 *     frameworks have loaded.
 */
function whenFrameworksReady(callback) {
    debug('whenFrameworksReady');
    var done = function () {
        debug('whenFrameworksReady done');
        callback();
    };
    // If webcomponents script is in the document, wait for WebComponentsReady.
    if (window.WebComponents && !window.WebComponents.ready) {
        debug('WebComponentsReady?');
        window.addEventListener('WebComponentsReady', function wcReady() {
            window.removeEventListener('WebComponentsReady', wcReady);
            debug('WebComponentsReady');
            done();
        });
    }
    else {
        done();
    }
}
/**
 * @return {string} '<count> <kind> tests' or '<count> <kind> test'.
 */
function pluralizedStat(count, kind) {
    if (count === 1) {
        return count + ' ' + kind + ' test';
    }
    else {
        return count + ' ' + kind + ' tests';
    }
}
/**
 * @param {string} path The URI of the script to load.
 * @param {function} done
 */
function loadScript(path, done) {
    var script = document.createElement('script');
    script.src = path;
    if (done) {
        script.onload = done.bind(null, null);
        script.onerror = done.bind(null, 'Failed to load script ' + script.src);
    }
    document.head.appendChild(script);
}
/**
 * @param {string} path The URI of the stylesheet to load.
 * @param {function} done
 */
function loadStyle(path, done) {
    var link = document.createElement('link');
    link.rel = 'stylesheet';
    link.href = path;
    if (done) {
        link.onload = done.bind(null, null);
        link.onerror = done.bind(null, 'Failed to load stylesheet ' + link.href);
    }
    document.head.appendChild(link);
}
/**
 * @param {...*} var_args Logs values to the console when the `debug`
 *     configuration option is true.
 */
function debug() {
    var var_args = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        var_args[_i] = arguments[_i];
    }
    if (!get('verbose')) {
        return;
    }
    var args = [window.location.pathname].concat(var_args);
    (console.debug || console.log).apply(console, args);
}
// URL Processing
/**
 * @param {string} url
 * @return {{base: string, params: string}}
 */
function parseUrl(url) {
    var parts = url.match(/^(.*?)(?:\?(.*))?$/);
    return {
        base: parts[1],
        params: getParams(parts[2] || ''),
    };
}
/**
 * Expands a URL that may or may not be relative to `base`.
 *
 * @param {string} url
 * @param {string} base
 * @return {string}
 */
function expandUrl(url, base) {
    if (!base)
        return url;
    if (url.match(/^(\/|https?:\/\/)/))
        return url;
    if (base.substr(base.length - 1) !== '/') {
        base = base + '/';
    }
    return base + url;
}
/**
 * @param {string=} opt_query A query string to parse.
 * @return {!Object<string, !Array<string>>} All params on the URL's query.
 */
function getParams(query) {
    query = typeof query === 'string' ? query : window.location.search;
    if (query.substring(0, 1) === '?') {
        query = query.substring(1);
    }
    // python's SimpleHTTPServer tacks a `/` on the end of query strings :(
    if (query.slice(-1) === '/') {
        query = query.substring(0, query.length - 1);
    }
    if (query === '')
        return {};
    var result = {};
    query.split('&').forEach(function (part) {
        var pair = part.split('=');
        if (pair.length !== 2) {
            console.warn('Invalid URL query part:', part);
            return;
        }
        var key = decodeURIComponent(pair[0]);
        var value = decodeURIComponent(pair[1]);
        if (!result[key]) {
            result[key] = [];
        }
        result[key].push(value);
    });
    return result;
}
/**
 * Merges params from `source` into `target` (mutating `target`).
 *
 * @param {!Object<string, !Array<string>>} target
 * @param {!Object<string, !Array<string>>} source
 */
function mergeParams(target, source) {
    Object.keys(source).forEach(function (key) {
        if (!(key in target)) {
            target[key] = [];
        }
        target[key] = target[key].concat(source[key]);
    });
}
/**
 * @param {string} param The param to return a value for.
 * @return {?string} The first value for `param`, if found.
 */
function getParam(param) {
    var params = getParams();
    return params[param] ? params[param][0] : null;
}
/**
 * @param {!Object<string, !Array<string>>} params
 * @return {string} `params` encoded as a URI query.
 */
function paramsToQuery(params) {
    var pairs = [];
    Object.keys(params).forEach(function (key) {
        params[key].forEach(function (value) {
            pairs.push(encodeURIComponent(key) + '=' + encodeURIComponent(value));
        });
    });
    return (pairs.length > 0) ? ('?' + pairs.join('&')) : '';
}
function getPathName(location) {
    return typeof location === 'string' ? location : location.pathname;
}
function basePath(location) {
    return getPathName(location).match(/^.*\//)[0];
}
function relativeLocation(location, basePath) {
    var path = getPathName(location);
    if (path.indexOf(basePath) === 0) {
        path = path.substring(basePath.length);
    }
    return path;
}
function cleanLocation(location) {
    var path = getPathName(location);
    if (path.slice(-11) === '/index.html') {
        path = path.slice(0, path.length - 10);
    }
    return path;
}
function parallel(runners, maybeLimit, done) {
    var limit;
    if (typeof maybeLimit !== 'number') {
        done = maybeLimit;
        limit = 0;
    }
    else {
        limit = maybeLimit;
    }
    if (!runners.length) {
        return done();
    }
    var called = false;
    var total = runners.length;
    var numActive = 0;
    var numDone = 0;
    function runnerDone(error) {
        if (called) {
            return;
        }
        numDone = numDone + 1;
        numActive = numActive - 1;
        if (error || numDone >= total) {
            called = true;
            done(error);
        }
        else {
            runOne();
        }
    }
    function runOne() {
        if (limit && numActive >= limit) {
            return;
        }
        if (!runners.length) {
            return;
        }
        numActive = numActive + 1;
        runners.shift()(runnerDone);
    }
    runners.forEach(runOne);
}
/**
 * Finds the directory that a loaded script is hosted on.
 *
 * @param {string} filename
 * @return {string?}
 */
function scriptPrefix(filename) {
    var scripts = document.querySelectorAll('script[src*="' + filename + '"]');
    if (scripts.length !== 1) {
        return null;
    }
    var script = scripts[0].src;
    return script.substring(0, script.indexOf(filename));
}


var util = Object.freeze({
    whenFrameworksReady: whenFrameworksReady,
    pluralizedStat: pluralizedStat,
    loadScript: loadScript,
    loadStyle: loadStyle,
    debug: debug,
    parseUrl: parseUrl,
    expandUrl: expandUrl,
    getParams: getParams,
    mergeParams: mergeParams,
    getParam: getParam,
    paramsToQuery: paramsToQuery,
    basePath: basePath,
    relativeLocation: relativeLocation,
    cleanLocation: cleanLocation,
    parallel: parallel,
    scriptPrefix: scriptPrefix
});

/**
 * A Mocha suite (or suites) run within a child iframe, but reported as if they
 * are part of the current context.
 */
var ChildRunner = /** @class */ (function () {
    function ChildRunner(url, parentScope) {
        var urlBits = parseUrl(url);
        mergeParams(urlBits.params, getParams(parentScope.location.search));
        delete urlBits.params.cli_browser_id;
        this.url = urlBits.base + paramsToQuery(urlBits.params);
        this.parentScope = parentScope;
        this.state = 'initializing';
    }
    /**
     * @return {ChildRunner} The `ChildRunner` that was registered for this
     * window.
     */
    ChildRunner.current = function () {
        return ChildRunner.get(window);
    };
    /**
     * @param {!Window} target A window to find the ChildRunner of.
     * @param {boolean} traversal Whether this is a traversal from a child window.
     * @return {ChildRunner} The `ChildRunner` that was registered for `target`.
     */
    ChildRunner.get = function (target, traversal) {
        var childRunner = ChildRunner._byUrl[target.location.href];
        if (childRunner) {
            return childRunner;
        }
        if (window.parent === window) { // Top window.
            if (traversal) {
                console.warn('Subsuite loaded but was never registered. This most likely is due to wonky history behavior. Reloading...');
                window.location.reload();
            }
            return null;
        }
        // Otherwise, traverse.
        return window.parent.WCT._ChildRunner.get(target, true);
    };
    /**
     * Loads and runs the subsuite.
     *
     * @param {function} done Node-style callback.
     */
    ChildRunner.prototype.run = function (done) {
        debug('ChildRunner#run', this.url);
        this.state = 'loading';
        this.onRunComplete = done;
        this.iframe = document.createElement('iframe');
        this.iframe.src = this.url;
        this.iframe.classList.add('subsuite');
        var container = document.getElementById('subsuites');
        if (!container) {
            container = document.createElement('div');
            container.id = 'subsuites';
            document.body.appendChild(container);
        }
        container.appendChild(this.iframe);
        // let the iframe expand the URL for us.
        this.url = this.iframe.src;
        ChildRunner._byUrl[this.url] = this;
        this.timeoutId = setTimeout(this.loaded.bind(this, new Error('Timed out loading ' + this.url)), ChildRunner.loadTimeout);
        this.iframe.addEventListener('error', this.loaded.bind(this, new Error('Failed to load document ' + this.url)));
        this.iframe.contentWindow.addEventListener('DOMContentLoaded', this.loaded.bind(this, null));
    };
    /**
     * Called when the sub suite's iframe has loaded (or errored during load).
     *
     * @param {*} error The error that occured, if any.
     */
    ChildRunner.prototype.loaded = function (error) {
        debug('ChildRunner#loaded', this.url, error);
        if (this.iframe.contentWindow == null && error) {
            this.signalRunComplete(error);
            this.done();
            return;
        }
        // Not all targets have WCT loaded (compatiblity mode)
        if (this.iframe.contentWindow.WCT) {
            this.share = this.iframe.contentWindow.WCT.share;
        }
        if (error) {
            this.signalRunComplete(error);
            this.done();
        }
    };
    /**
     * Called in mocha/run.js when all dependencies have loaded, and the child is
     * ready to start running tests
     *
     * @param {*} error The error that occured, if any.
     */
    ChildRunner.prototype.ready = function (error) {
        debug('ChildRunner#ready', this.url, error);
        if (this.timeoutId) {
            clearTimeout(this.timeoutId);
        }
        if (error) {
            this.signalRunComplete(error);
            this.done();
        }
    };
    /**
     * Called when the sub suite's tests are complete, so that it can clean up.
     */
    ChildRunner.prototype.done = function () {
        debug('ChildRunner#done', this.url, arguments);
        // make sure to clear that timeout
        this.ready();
        this.signalRunComplete();
        if (!this.iframe)
            return;
        // Be safe and avoid potential browser crashes when logic attempts to
        // interact with the removed iframe.
        setTimeout(function () {
            this.iframe.parentNode.removeChild(this.iframe);
            this.iframe = null;
            this.share = null;
        }.bind(this), 1);
    };
    ChildRunner.prototype.signalRunComplete = function (error) {
        if (!this.onRunComplete)
            return;
        this.state = 'complete';
        this.onRunComplete(error);
        this.onRunComplete = null;
    };
    // ChildRunners get a pretty generous load timeout by default.
    ChildRunner.loadTimeout = 60000;
    // We can't maintain properties on iframe elements in Firefox/Safari/???, so
    // we track childRunners by URL.
    ChildRunner._byUrl = {};
    return ChildRunner;
}());

var SOCKETIO_ENDPOINT = window.location.protocol + '//' + window.location.host;
var SOCKETIO_LIBRARY = SOCKETIO_ENDPOINT + '/socket.io/socket.io.js';
/**
 * A socket for communication between the CLI and browser runners.
 *
 * @param {string} browserId An ID generated by the CLI runner.
 * @param {!io.Socket} socket The socket.io `Socket` to communicate over.
 */
var CLISocket = /** @class */ (function () {
    function CLISocket(browserId, socket) {
        this.browserId = browserId;
        this.socket = socket;
    }
    /**
     * @param {!Mocha.Runner} runner The Mocha `Runner` to observe, reporting
     *     interesting events back to the CLI runner.
     */
    CLISocket.prototype.observe = function (runner) {
        var _this = this;
        this.emitEvent('browser-start', {
            url: window.location.toString(),
        });
        // We only emit a subset of events that we care about, and follow a more
        // general event format that is hopefully applicable to test runners beyond
        // mocha.
        //
        // For all possible mocha events, see:
        // https://github.com/visionmedia/mocha/blob/master/lib/runner.js#L36
        runner.on('test', function (test) {
            _this.emitEvent('test-start', { test: getTitles(test) });
        });
        runner.on('test end', function (test) {
            _this.emitEvent('test-end', {
                state: getState(test),
                test: getTitles(test),
                duration: test.duration,
                error: test.err,
            });
        });
        runner.on('fail', function (test, err) {
            // fail the test run if we catch errors outside of a test function
            if (test.type !== 'test') {
                _this.emitEvent('browser-fail', 'Error thrown outside of test function: ' + err.stack);
            }
        });
        runner.on('childRunner start', function (childRunner) {
            _this.emitEvent('sub-suite-start', childRunner.share);
        });
        runner.on('childRunner end', function (childRunner) {
            _this.emitEvent('sub-suite-end', childRunner.share);
        });
        runner.on('end', function () {
            _this.emitEvent('browser-end');
        });
    };
    /**
     * @param {string} event The name of the event to fire.
     * @param {*} data Additional data to pass with the event.
     */
    CLISocket.prototype.emitEvent = function (event, data) {
        this.socket.emit('client-event', {
            browserId: this.browserId,
            event: event,
            data: data,
        });
    };
    /**
     * Builds a `CLISocket` if we are within a CLI-run environment; short-circuits
     * otherwise.
     *
     * @param {function(*, CLISocket)} done Node-style callback.
     */
    CLISocket.init = function (done) {
        var browserId = getParam('cli_browser_id');
        if (!browserId)
            return done();
        // Only fire up the socket for root runners.
        if (ChildRunner.current())
            return done();
        loadScript(SOCKETIO_LIBRARY, function (error) {
            if (error)
                return done(error);
            var socket = io(SOCKETIO_ENDPOINT);
            socket.on('error', function (error) {
                socket.off();
                done(error);
            });
            socket.on('connect', function () {
                socket.off();
                done(null, new CLISocket(browserId, socket));
            });
        });
    };
    return CLISocket;
}());
// Misc Utility
/**
 * @param {!Mocha.Runnable} runnable The test or suite to extract titles from.
 * @return {!Array.<string>} The titles of the runnable and its parents.
 */
function getTitles(runnable) {
    var titles = [];
    while (runnable && !runnable.root && runnable.title) {
        titles.unshift(runnable.title);
        runnable = runnable.parent;
    }
    return titles;
}
/**
 * @param {!Mocha.Runnable} runnable
 * @return {string}
 */
function getState(runnable) {
    if (runnable.state === 'passed') {
        return 'passing';
    }
    else if (runnable.state === 'failed') {
        return 'failing';
    }
    else if (runnable.pending) {
        return 'pending';
    }
    else {
        return 'unknown';
    }
}

// We capture console events when running tests; so make sure we have a
// reference to the original one.
var console$1 = window.console;
var FONT = ';font: normal 13px "Roboto", "Helvetica Neue", "Helvetica", sans-serif;';
var STYLES = {
    plain: FONT,
    suite: 'color: #5c6bc0' + FONT,
    test: FONT,
    passing: 'color: #259b24' + FONT,
    pending: 'color: #e65100' + FONT,
    failing: 'color: #c41411' + FONT,
    stack: 'color: #c41411',
    results: FONT + 'font-size: 16px',
};
// I don't think we can feature detect this one...
var userAgent = navigator.userAgent.toLowerCase();
var CAN_STYLE_LOG = userAgent.match('firefox') || userAgent.match('webkit');
var CAN_STYLE_GROUP = userAgent.match('webkit');
// Track the indent for faked `console.group`
var logIndent = '';
function log(text, style) {
    text = text.split('\n')
        .map(function (l) {
        return logIndent + l;
    })
        .join('\n');
    if (CAN_STYLE_LOG) {
        console$1.log('%c' + text, STYLES[style] || STYLES.plain);
    }
    else {
        console$1.log(text);
    }
}
function logGroup(text, style) {
    if (CAN_STYLE_GROUP) {
        console$1.group('%c' + text, STYLES[style] || STYLES.plain);
    }
    else if (console$1.group) {
        console$1.group(text);
    }
    else {
        logIndent = logIndent + '  ';
        log(text, style);
    }
}
function logGroupEnd() {
    if (console$1.groupEnd) {
        console$1.groupEnd();
    }
    else {
        logIndent = logIndent.substr(0, logIndent.length - 2);
    }
}
function logException(error) {
    log(error.stack || error.message || (error + ''), 'stack');
}
/**
 * A Mocha reporter that logs results out to the web `console`.
 */
var Console = /** @class */ (function () {
    /**
     * @param runner The runner that is being reported on.
     */
    function Console(runner) {
        Mocha.reporters.Base.call(this, runner);
        runner.on('suite', function (suite) {
            if (suite.root) {
                return;
            }
            logGroup(suite.title, 'suite');
        }.bind(this));
        runner.on('suite end', function (suite) {
            if (suite.root) {
                return;
            }
            logGroupEnd();
        }.bind(this));
        runner.on('test', function (test) {
            logGroup(test.title, 'test');
        }.bind(this));
        runner.on('pending', function (test) {
            logGroup(test.title, 'pending');
        }.bind(this));
        runner.on('fail', function (_test, error) {
            logException(error);
        }.bind(this));
        runner.on('test end', function (_test) {
            logGroupEnd();
        }.bind(this));
        runner.on('end', this.logSummary.bind(this));
    }
    /** Prints out a final summary of test results. */
    Console.prototype.logSummary = function () {
        logGroup('Test Results', 'results');
        if (this.stats.failures > 0) {
            log(pluralizedStat(this.stats.failures, 'failing'), 'failing');
        }
        if (this.stats.pending > 0) {
            log(pluralizedStat(this.stats.pending, 'pending'), 'pending');
        }
        log(pluralizedStat(this.stats.passes, 'passing'));
        if (!this.stats.failures) {
            log('test suite passed', 'passing');
        }
        log('Evaluated ' + this.stats.tests + ' tests in ' +
            this.stats.duration + 'ms.');
        logGroupEnd();
    };
    return Console;
}());

/**
 * @license
 * Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
 * This code may only be used under the BSD style license found at
 * http://polymer.github.io/LICENSE.txt The complete set of authors may be found
 * at http://polymer.github.io/AUTHORS.txt The complete set of contributors may
 * be found at http://polymer.github.io/CONTRIBUTORS.txt Code distributed by
 * Google as part of the polymer project is also subject to an additional IP
 * rights grant found at http://polymer.github.io/PATENTS.txt
 */
/**
 * WCT-specific behavior on top of Mocha's default HTML reporter.
 *
 * @param {!Mocha.Runner} runner The runner that is being reported on.
 */
function HTML(runner) {
    var output = document.createElement('div');
    output.id = 'mocha';
    document.body.appendChild(output);
    runner.on('suite', function (_test) {
        this.total = runner.total;
    }.bind(this));
    Mocha.reporters.HTML.call(this, runner);
}
// Woo! What a hack. This just saves us from adding a bunch of complexity around
// style loading.
var style = document.createElement('style');
style.textContent = "\n    html, body {\n      position: relative;\n      height: 100%;\n      width:  100%;\n      min-width: 900px;\n    }\n    #mocha, #subsuites {\n      height: 100%;\n      position: absolute;\n      top: 0;\n    }\n    #mocha {\n      box-sizing: border-box;\n      margin: 0 !important;\n      padding: 60px 20px;\n      right: 0;\n      left: 500px;\n    }\n    #subsuites {\n      -ms-flex-direction: column;\n      -webkit-flex-direction: column;\n      display: -ms-flexbox;\n      display: -webkit-flex;\n      display: flex;\n      flex-direction: column;\n      left: 0;\n      width: 500px;\n    }\n    #subsuites .subsuite {\n      border: 0;\n      width: 100%;\n      height: 100%;\n    }\n    #mocha .test.pass .duration {\n      color: #555 !important;\n    }\n";
document.head.appendChild(style);

var STACKY_CONFIG = {
    indent: '  ',
    locationStrip: [
        /^https?:\/\/[^\/]+/,
        /\?.*$/,
    ],
    filter: function (line) {
        return !!line.location.match(/\/web-component-tester\/[^\/]+(\?.*)?$/);
    },
};
// https://github.com/visionmedia/mocha/blob/master/lib/runner.js#L36-46
var MOCHA_EVENTS = [
    'start', 'end', 'suite', 'suite end', 'test', 'test end', 'hook', 'hook end',
    'pass', 'fail', 'pending', 'childRunner end'
];
// Until a suite has loaded, we assume this many tests in it.
var ESTIMATED_TESTS_PER_SUITE = 3;
/**
 * A Mocha-like reporter that combines the output of multiple Mocha suites.
 */
var MultiReporter = /** @class */ (function () {
    /**
     * @param numSuites The number of suites that will be run, in order to
     *     estimate the total number of tests that will be performed.
     * @param reporters The set of reporters that
     *     should receive the unified event stream.
     * @param parent The parent reporter, if present.
     */
    function MultiReporter(numSuites, reporters, parent) {
        var _this = this;
        this.reporters = reporters.map(function (reporter) {
            return new reporter(_this);
        });
        this.parent = parent;
        this.basePath = parent && parent.basePath || basePath(window.location);
        this.total = numSuites * ESTIMATED_TESTS_PER_SUITE;
        // Mocha reporters assume a stream of events, so we have to be careful to
        // only report on one runner at a time...
        this.currentRunner = null;
        // ...while we buffer events for any other active runners.
        this.pendingEvents = [];
        this.emit('start');
    }
    /**
     * @param location The location this reporter represents.
     * @return A reporter-like "class" for each child suite
     *     that should be passed to `mocha.run`.
     */
    MultiReporter.prototype.childReporter = function (location) {
        var name = this.suiteTitle(location);
        // The reporter is used as a constructor, so we can't depend on `this` being
        // properly bound.
        var self = this;
        return _a = /** @class */ (function () {
                function ChildReporter(runner) {
                    runner.name = window.name;
                    self.bindChildRunner(runner);
                }
                return ChildReporter;
            }()),
            _a.title = window.name,
            _a;
        var _a;
    };
    /** Must be called once all runners have finished. */
    MultiReporter.prototype.done = function () {
        this.complete = true;
        this.flushPendingEvents();
        this.emit('end');
    };
    /**
     * Emit a top level test that is not part of any suite managed by this
     * reporter.
     *
     * Helpful for reporting on global errors, loading issues, etc.
     *
     * @param title The title of the test.
     * @param error An error associated with this test. If falsy, test is
     *     considered to be passing.
     * @param suiteTitle Title for the suite that's wrapping the test.
     * @param estimated If this test was included in the original
     *     estimate of `numSuites`.
     */
    MultiReporter.prototype.emitOutOfBandTest = function (title, error, suiteTitle, estimated) {
        debug('MultiReporter#emitOutOfBandTest(', arguments, ')');
        var root = new Mocha.Suite(suiteTitle || '');
        var test = new Mocha.Test(title, function () { });
        test.parent = root;
        test.state = error ? 'failed' : 'passed';
        test.err = error;
        if (!estimated) {
            this.total = this.total + ESTIMATED_TESTS_PER_SUITE;
        }
        var runner = { total: 1 };
        this.proxyEvent('start', runner);
        this.proxyEvent('suite', runner, root);
        this.proxyEvent('test', runner, test);
        if (error) {
            this.proxyEvent('fail', runner, test, error);
        }
        else {
            this.proxyEvent('pass', runner, test);
        }
        this.proxyEvent('test end', runner, test);
        this.proxyEvent('suite end', runner, root);
        this.proxyEvent('end', runner);
    };
    /**
     * @param {!Location|string} location
     * @return {string}
     */
    MultiReporter.prototype.suiteTitle = function (location) {
        var path = relativeLocation(location, this.basePath);
        path = cleanLocation(path);
        return path;
    };
    // Internal Interface
    /** @param {!Mocha.runners.Base} runner The runner to listen to events for. */
    MultiReporter.prototype.bindChildRunner = function (runner) {
        var _this = this;
        MOCHA_EVENTS.forEach(function (eventName) {
            runner.on(eventName, _this.proxyEvent.bind(_this, eventName, runner));
        });
    };
    /**
     * Evaluates an event fired by `runner`, proxying it forward or buffering it.
     *
     * @param {string} eventName
     * @param {!Mocha.runners.Base} runner The runner that emitted this event.
     * @param {...*} var_args Any additional data passed as part of the event.
     */
    MultiReporter.prototype.proxyEvent = function (eventName, runner) {
        var _args = [];
        for (var _i = 2; _i < arguments.length; _i++) {
            _args[_i - 2] = arguments[_i];
        }
        var extraArgs = Array.prototype.slice.call(arguments, 2);
        if (this.complete) {
            console.warn('out of order Mocha event for ' + runner.name + ':', eventName, extraArgs);
            return;
        }
        if (this.currentRunner && runner !== this.currentRunner) {
            this.pendingEvents.push(Array.prototype.slice.call(arguments));
            return;
        }
        debug('MultiReporter#proxyEvent(', arguments, ')');
        // This appears to be a Mocha bug: Tests failed by passing an error to their
        // done function don't set `err` properly.
        //
        // TODO(nevir): Track down.
        if (eventName === 'fail' && !extraArgs[0].err) {
            extraArgs[0].err = extraArgs[1];
        }
        if (eventName === 'start') {
            this.onRunnerStart(runner);
        }
        else if (eventName === 'end') {
            this.onRunnerEnd(runner);
        }
        else {
            this.cleanEvent(eventName, runner, extraArgs);
            this.emit.apply(this, [eventName].concat(extraArgs));
        }
    };
    /**
     * Cleans or modifies an event if needed.
     *
     * @param eventName
     * @param runner The runner that emitted this event.
     * @param extraArgs
     */
    MultiReporter.prototype.cleanEvent = function (eventName, _runner, extraArgs) {
        // Suite hierarchy
        if (extraArgs[0]) {
            extraArgs[0] = this.showRootSuite(extraArgs[0]);
        }
        // Normalize errors
        if (eventName === 'fail') {
            extraArgs[1] = Stacky.normalize(extraArgs[1], STACKY_CONFIG);
        }
        if (extraArgs[0] && extraArgs[0].err) {
            extraArgs[0].err = Stacky.normalize(extraArgs[0].err, STACKY_CONFIG);
        }
    };
    /**
     * We like to show the root suite's title, which requires a little bit of
     * trickery in the suite hierarchy.
     *
     * @param {!Mocha.Runnable} node
     */
    MultiReporter.prototype.showRootSuite = function (node) {
        var leaf = node = Object.create(node);
        while (node && node.parent) {
            var wrappedParent = Object.create(node.parent);
            node.parent = wrappedParent;
            node = wrappedParent;
        }
        node.root = false;
        return leaf;
    };
    /** @param {!Mocha.runners.Base} runner */
    MultiReporter.prototype.onRunnerStart = function (runner) {
        debug('MultiReporter#onRunnerStart:', runner.name);
        this.total = this.total - ESTIMATED_TESTS_PER_SUITE + runner.total;
        this.currentRunner = runner;
    };
    /** @param {!Mocha.runners.Base} runner */
    MultiReporter.prototype.onRunnerEnd = function (runner) {
        debug('MultiReporter#onRunnerEnd:', runner.name);
        this.currentRunner = null;
        this.flushPendingEvents();
    };
    /**
     * Flushes any buffered events and runs them through `proxyEvent`. This will
     * loop until all buffered runners are complete, or we have run out of
     * buffered events.
     */
    MultiReporter.prototype.flushPendingEvents = function () {
        var _this = this;
        var events = this.pendingEvents;
        this.pendingEvents = [];
        events.forEach(function (eventArgs) {
            _this.proxyEvent.apply(_this, eventArgs);
        });
    };
    return MultiReporter;
}());

var ARC_OFFSET = 0; // start at the right.
var ARC_WIDTH = 6;
/**
 * A Mocha reporter that updates the document's title and favicon with
 * at-a-glance stats.
 *
 * @param {!Mocha.Runner} runner The runner that is being reported on.
 */
var Title = /** @class */ (function () {
    function Title(runner) {
        Mocha.reporters.Base.call(this, runner);
        runner.on('test end', this.report.bind(this));
    }
    /** Reports current stats via the page title and favicon. */
    Title.prototype.report = function () {
        this.updateTitle();
        this.updateFavicon();
    };
    /** Updates the document title with a summary of current stats. */
    Title.prototype.updateTitle = function () {
        if (this.stats.failures > 0) {
            document.title = pluralizedStat(this.stats.failures, 'failing');
        }
        else {
            document.title = pluralizedStat(this.stats.passes, 'passing');
        }
    };
    /** Updates the document's favicon w/ a summary of current stats. */
    Title.prototype.updateFavicon = function () {
        var canvas = document.createElement('canvas');
        canvas.height = canvas.width = 32;
        var context = canvas.getContext('2d');
        var passing = this.stats.passes;
        var pending = this.stats.pending;
        var failing = this.stats.failures;
        var total = Math.max(this.runner.total, passing + pending + failing);
        drawFaviconArc(context, total, 0, passing, '#0e9c57');
        drawFaviconArc(context, total, passing, pending, '#f3b300');
        drawFaviconArc(context, total, pending + passing, failing, '#ff5621');
        this.setFavicon(canvas.toDataURL());
    };
    /** Sets the current favicon by URL. */
    Title.prototype.setFavicon = function (url) {
        var current = document.head.querySelector('link[rel="icon"]');
        if (current) {
            document.head.removeChild(current);
        }
        var link = document.createElement('link');
        link.rel = 'icon';
        link.type = 'image/x-icon';
        link.href = url;
        link.setAttribute('sizes', '32x32');
        document.head.appendChild(link);
    };
    return Title;
}());
/**
 * Draws an arc for the favicon status, relative to the total number of tests.
 */
function drawFaviconArc(context, total, start, length, color) {
    var arcStart = ARC_OFFSET + Math.PI * 2 * (start / total);
    var arcEnd = ARC_OFFSET + Math.PI * 2 * ((start + length) / total);
    context.beginPath();
    context.strokeStyle = color;
    context.lineWidth = ARC_WIDTH;
    context.arc(16, 16, 16 - ARC_WIDTH / 2, arcStart, arcEnd);
    context.stroke();
}

var htmlSuites$1 = [];
var jsSuites$1 = [];
// We process grep ourselves to avoid loading suites that will be filtered.
var GREP = getParam('grep');
// work around mocha bug (https://github.com/mochajs/mocha/issues/2070)
if (GREP) {
    GREP = GREP.replace(/\\\./g, '.');
}
/**
 * Loads suites of tests, supporting both `.js` and `.html` files.
 *
 * @param files The files to load.
 */
function loadSuites(files) {
    files.forEach(function (file) {
        if (/\.js(\?.*)?$/.test(file)) {
            jsSuites$1.push(file);
        }
        else if (/\.html(\?.*)?$/.test(file)) {
            htmlSuites$1.push(file);
        }
        else {
            throw new Error('Unknown resource type: ' + file);
        }
    });
}
/**
 * @return The child suites that should be loaded, ignoring
 *     those that would not match `GREP`.
 */
function activeChildSuites() {
    var subsuites = htmlSuites$1;
    if (GREP) {
        var cleanSubsuites = [];
        for (var i = 0, subsuite = void 0; subsuite = subsuites[i]; i++) {
            if (GREP.indexOf(cleanLocation(subsuite)) !== -1) {
                cleanSubsuites.push(subsuite);
            }
        }
        subsuites = cleanSubsuites;
    }
    return subsuites;
}
/**
 * Loads all `.js` sources requested by the current suite.
 */
function loadJsSuites(_reporter, done) {
    debug('loadJsSuites', jsSuites$1);
    var loaders = jsSuites$1.map(function (file) {
        // We only support `.js` dependencies for now.
        return loadScript.bind(util, file);
    });
    parallel(loaders, done);
}
function runSuites(reporter, childSuites, done) {
    debug('runSuites');
    var suiteRunners = [
        // Run the local tests (if any) first, not stopping on error;
        _runMocha.bind(null, reporter),
    ];
    // As well as any sub suites. Again, don't stop on error.
    childSuites.forEach(function (file) {
        suiteRunners.push(function (next) {
            var childRunner = new ChildRunner(file, window);
            reporter.emit('childRunner start', childRunner);
            childRunner.run(function (error) {
                reporter.emit('childRunner end', childRunner);
                if (error)
                    reporter.emitOutOfBandTest(file, error);
                next();
            });
        });
    });
    parallel(suiteRunners, get('numConcurrentSuites'), function (error) {
        reporter.done();
        done(error);
    });
}
/**
 * Kicks off a mocha run, waiting for frameworks to load if necessary.
 *
 * @param {!MultiReporter} reporter Where to send Mocha's events.
 * @param {function} done A callback fired, _no error is passed_.
 */
function _runMocha(reporter, done, waited) {
    if (get('waitForFrameworks') && !waited) {
        var waitFor = (get('waitFor') || whenFrameworksReady).bind(window);
        waitFor(_runMocha.bind(null, reporter, done, true));
        return;
    }
    debug('_runMocha');
    var mocha = window.mocha;
    var Mocha = window.Mocha;
    mocha.reporter(reporter.childReporter(window.location));
    mocha.suite.title = reporter.suiteTitle(window.location);
    mocha.grep(GREP);
    // We can't use `mocha.run` because it bashes over grep, invert, and friends.
    // See https://github.com/visionmedia/mocha/blob/master/support/tail.js#L137
    var runner = Mocha.prototype.run.call(mocha, function (_error) {
        if (document.getElementById('mocha')) {
            Mocha.utils.highlightTags('code');
        }
        done(); // We ignore the Mocha failure count.
    });
    // Mocha's default `onerror` handling strips the stack (to support really old
    // browsers). We upgrade this to get better stacks for async errors.
    //
    // TODO(nevir): Can we expand support to other browsers?
    if (navigator.userAgent.match(/chrome/i)) {
        window.onerror = null;
        window.addEventListener('error', function (event) {
            if (!event.error)
                return;
            if (event.error.ignore)
                return;
            runner.uncaught(event.error);
        });
    }
}

/**
 * @param {CLISocket} socket The CLI socket, if present.
 * @param {MultiReporter} parent The parent reporter, if present.
 * @return {!Array.<!Mocha.reporters.Base} The reporters that should be used.
 */
function determineReporters(socket, parent) {
    // Parents are greedy.
    if (parent) {
        return [parent.childReporter(window.location)];
    }
    // Otherwise, we get to run wild without any parental supervision!
    var reporters = [Title, Console];
    if (socket) {
        reporters.push(function (runner) {
            socket.observe(runner);
        });
    }
    if (htmlSuites$1.length > 0 || jsSuites$1.length > 0) {
        reporters.push(HTML);
    }
    return reporters;
}
/**
 * Yeah, hideous, but this allows us to be loaded before Mocha, which is handy.
 */
function injectMocha(Mocha) {
    _injectPrototype(Console, Mocha.reporters.Base.prototype);
    _injectPrototype(HTML, Mocha.reporters.HTML.prototype);
    // Mocha doesn't expose its `EventEmitter` shim directly, so:
    _injectPrototype(MultiReporter, Object.getPrototypeOf(Mocha.Runner.prototype));
}
function _injectPrototype(klass, prototype) {
    var newPrototype = Object.create(prototype);
    // Only support
    Object.keys(klass.prototype).forEach(function (key) {
        newPrototype[key] = klass.prototype[key];
    });
    klass.prototype = newPrototype;
}

/**
 * Loads all environment scripts ...synchronously ...after us.
 */
function loadSync() {
    debug('Loading environment scripts:');
    var a11ySuiteScriptPath = 'web-component-tester/data/a11ySuite.js';
    var scripts = get('environmentScripts');
    var a11ySuiteWillBeLoaded = window.__generatedByWct || scripts.indexOf(a11ySuiteScriptPath) > -1;
    // We can't inject a11ySuite when running the npm version because it is a
    // module-based script that needs `<script type=module>` and compilation
    // for browsers without module support.
    if (!a11ySuiteWillBeLoaded && !window.__wctUseNpm) {
        // wct is running as a bower dependency, load a11ySuite from data/
        scripts.push(a11ySuiteScriptPath);
    }
    scripts.forEach(function (path) {
        var url = expandUrl(path, get('root'));
        debug('Loading environment script:', url);
        // Synchronous load.
        document.write('<script src="' + encodeURI(url) +
            '"></script>'); // jshint ignore:line
    });
    debug('Environment scripts loaded');
    var imports = get('environmentImports');
    imports.forEach(function (path) {
        var url = expandUrl(path, get('root'));
        debug('Loading environment import:', url);
        // Synchronous load.
        document.write('<link rel="import" href="' + encodeURI(url) +
            '">'); // jshint ignore:line
    });
    debug('Environment imports loaded');
}
/**
 * We have some hard dependencies on things that should be loaded via
 * `environmentScripts`, so we assert that they're present here; and do any
 * post-facto setup.
 */
function ensureDependenciesPresent() {
    _ensureMocha();
    _checkChai();
}
function _ensureMocha() {
    var Mocha = window.Mocha;
    if (!Mocha) {
        throw new Error('WCT requires Mocha. Please ensure that it is present in WCT.environmentScripts, or that you load it before loading web-component-tester/browser.js');
    }
    injectMocha(Mocha);
    // Magic loading of mocha's stylesheet
    var mochaPrefix = scriptPrefix('mocha.js');
    // only load mocha stylesheet for the test runner output
    // Not the end of the world, if it doesn't load.
    if (mochaPrefix && window.top === window.self) {
        loadStyle(mochaPrefix + 'mocha.css');
    }
}
function _checkChai() {
    if (!window.chai) {
        debug('Chai not present; not registering shorthands');
        return;
    }
    window.assert = window.chai.assert;
    window.expect = window.chai.expect;
}

// We may encounter errors during initialization (for example, syntax errors in
// a test file). Hang onto those (and more) until we are ready to report them.
var globalErrors = [];
/**
 * Hook the environment to pick up on global errors.
 */
function listenForErrors() {
    window.addEventListener('error', function (event) {
        globalErrors.push(event.error);
    });
    // Also, we treat `console.error` as a test failure. Unless you prefer not.
    var origConsole = console;
    var origError = console.error;
    console.error = function wctShimmedError() {
        origError.apply(origConsole, arguments);
        if (get('trackConsoleError')) {
            throw 'console.error: ' + Array.prototype.join.call(arguments, ' ');
        }
    };
}

var interfaceExtensions = [];
/**
 * Registers an extension that extends the global `Mocha` implementation
 * with new helper methods. These helper methods will be added to the `window`
 * when tests run for both BDD and TDD interfaces.
 */
function extendInterfaces(helperName, helperFactory) {
    interfaceExtensions.push(function () {
        var Mocha = window.Mocha;
        // For all Mocha interfaces (probably just TDD and BDD):
        Object.keys(Mocha.interfaces)
            .forEach(function (interfaceName) {
            // This is the original callback that defines the interface (TDD or
            // BDD):
            var originalInterface = Mocha.interfaces[interfaceName];
            // This is the name of the "teardown" or "afterEach" property for the
            // current interface:
            var teardownProperty = interfaceName === 'tdd' ? 'teardown' : 'afterEach';
            // The original callback is monkey patched with a new one that appends
            // to the global context however we want it to:
            Mocha.interfaces[interfaceName] = function (suite) {
                // Call back to the original callback so that we get the base
                // interface:
                originalInterface.apply(this, arguments);
                // Register a listener so that we can further extend the base
                // interface:
                suite.on('pre-require', function (context, _file, _mocha) {
                    // Capture a bound reference to the teardown function as a
                    // convenience:
                    var teardown = context[teardownProperty].bind(context);
                    // Add our new helper to the testing context. The helper is
                    // generated by a factory method that receives the context,
                    // the teardown function and the interface name and returns
                    // the new method to be added to that context:
                    context[helperName] =
                        helperFactory(context, teardown, interfaceName);
                });
            };
        });
    });
}
/**
 * Applies any registered interface extensions. The extensions will be applied
 * as many times as this function is called, so don't call it more than once.
 */
function applyExtensions() {
    interfaceExtensions.forEach(function (applyExtension) {
        applyExtension();
    });
}

extendInterfaces('fixture', function (context, teardown) {
    // Return context.fixture if it is already a thing, for backwards
    // compatibility with `test-fixture-mocha.js`:
    return context.fixture || function fixture(fixtureId, model) {
        // Automatically register a teardown callback that will restore the
        // test-fixture:
        teardown(function () {
            document.getElementById(fixtureId).restore();
        });
        // Find the test-fixture with the provided ID and create it, returning
        // the results:
        return document.getElementById(fixtureId).create(model);
    };
});

/**
 * stub
 *
 * The stub addon allows the tester to partially replace the implementation of
 * an element with some custom implementation. Usage example:
 *
 * beforeEach(function() {
 *   stub('x-foo', {
 *     attached: function() {
 *       // Custom implementation of the `attached` method of element `x-foo`..
 *     },
 *     otherMethod: function() {
 *       // More custom implementation..
 *     },
 *     getterSetterProperty: {
 *       get: function() {
 *         // Custom getter implementation..
 *       },
 *       set: function() {
 *         // Custom setter implementation..
 *       }
 *     },
 *     // etc..
 *   });
 * });
 */
extendInterfaces('stub', function (_context, teardown) {
    return function stub(tagName, implementation) {
        // Find the prototype of the element being stubbed:
        var proto = document.createElement(tagName).constructor.prototype;
        // For all keys in the implementation to stub with..
        var stubs = Object.keys(implementation).map(function (key) {
            // Stub the method on the element prototype with Sinon:
            return sinon.stub(proto, key, implementation[key]);
        });
        // After all tests..
        teardown(function () {
            stubs.forEach(function (stub) {
                stub.restore();
            });
        });
    };
});

// replacement map stores what should be
var replacements = {};
var replaceTeardownAttached = false;
/**
 * replace
 *
 * The replace addon allows the tester to replace all usages of one element with
 * another element within all Polymer elements created within the time span of
 * the test. Usage example:
 *
 * beforeEach(function() {
 *   replace('x-foo').with('x-fake-foo');
 * });
 *
 * All annotations and attributes will be set on the placement element the way
 * they were set for the original element.
 */
extendInterfaces('replace', function (_context, teardown) {
    return function replace(oldTagName) {
        return {
            with: function (tagName) {
                // Standardizes our replacements map
                oldTagName = oldTagName.toLowerCase();
                tagName = tagName.toLowerCase();
                replacements[oldTagName] = tagName;
                // If the function is already a stub, restore it to original
                if (document.importNode.isSinonProxy) {
                    return;
                }
                if (!window.Polymer.Element) {
                    window.Polymer.Element = function () { };
                    window.Polymer.Element.prototype._stampTemplate = function () { };
                }
                // Keep a reference to the original `document.importNode`
                // implementation for later:
                var originalImportNode = document.importNode;
                // Use Sinon to stub `document.ImportNode`:
                sinon.stub(document, 'importNode', function (origContent, deep) {
                    var templateClone = document.createElement('template');
                    var content = templateClone.content;
                    var inertDoc = content.ownerDocument;
                    // imports node from inertDoc which holds inert nodes.
                    templateClone.content.appendChild(inertDoc.importNode(origContent, true));
                    // optional arguments are not optional on IE.
                    var nodeIterator = document.createNodeIterator(content, NodeFilter.SHOW_ELEMENT, null, true);
                    var node;
                    // Traverses the tree. A recently-replaced node will be put next,
                    // so if a node is replaced, it will be checked if it needs to be
                    // replaced again.
                    while (node = nodeIterator.nextNode()) {
                        var currentTagName = node.tagName.toLowerCase();
                        if (replacements.hasOwnProperty(currentTagName)) {
                            currentTagName = replacements[currentTagName];
                            // find the final tag name.
                            while (replacements[currentTagName]) {
                                currentTagName = replacements[currentTagName];
                            }
                            // Create a replacement:
                            var replacement = document.createElement(currentTagName);
                            // For all attributes in the original node..
                            for (var index = 0; index < node.attributes.length; ++index) {
                                // Set that attribute on the replacement:
                                replacement.setAttribute(node.attributes[index].name, node.attributes[index].value);
                            }
                            // Replace the original node with the replacement node:
                            node.parentNode.replaceChild(replacement, node);
                        }
                    }
                    return originalImportNode.call(this, content, deep);
                });
                if (!replaceTeardownAttached) {
                    // After each test...
                    teardown(function () {
                        replaceTeardownAttached = true;
                        // Restore the stubbed version of `document.importNode`:
                        var documentImportNode = document.importNode;
                        if (documentImportNode.isSinonProxy) {
                            documentImportNode.restore();
                        }
                        // Empty the replacement map
                        replacements = {};
                    });
                }
            }
        };
    };
});

// Mocha global helpers, broken out by testing method.
//
// Keys are the method for a particular interface; values are their analog in
// the opposite interface.
var MOCHA_EXPORTS = {
    // https://github.com/visionmedia/mocha/blob/master/lib/interfaces/tdd.js
    tdd: {
        'setup': '"before"',
        'teardown': '"after"',
        'suiteSetup': '"beforeEach"',
        'suiteTeardown': '"afterEach"',
        'suite': '"describe" or "context"',
        'test': '"it" or "specify"',
    },
    // https://github.com/visionmedia/mocha/blob/master/lib/interfaces/bdd.js
    bdd: {
        'before': '"setup"',
        'after': '"teardown"',
        'beforeEach': '"suiteSetup"',
        'afterEach': '"suiteTeardown"',
        'describe': '"suite"',
        'context': '"suite"',
        'xdescribe': '"suite.skip"',
        'xcontext': '"suite.skip"',
        'it': '"test"',
        'xit': '"test.skip"',
        'specify': '"test"',
        'xspecify': '"test.skip"',
    },
};
/**
 * Exposes all Mocha methods up front, configuring and running mocha
 * automatically when you call them.
 *
 * The assumption is that it is a one-off (sub-)suite of tests being run.
 */
function stubInterfaces() {
    var keys = Object.keys(MOCHA_EXPORTS);
    keys.forEach(function (ui) {
        Object.keys(MOCHA_EXPORTS[ui]).forEach(function (key) {
            window[key] = function wrappedMochaFunction() {
                _setupMocha(ui, key, MOCHA_EXPORTS[ui][key]);
                if (!window[key] || window[key] === wrappedMochaFunction) {
                    throw new Error('Expected mocha.setup to define ' + key);
                }
                window[key].apply(window, arguments);
            };
        });
    });
}
// Whether we've called `mocha.setup`
var _mochaIsSetup = false;
/**
 * @param {string} ui Sets up mocha to run `ui`-style tests.
 * @param {string} key The method called that triggered this.
 * @param {string} alternate The matching method in the opposite interface.
 */
function _setupMocha(ui, key, alternate) {
    var mochaOptions = get('mochaOptions');
    if (mochaOptions.ui && mochaOptions.ui !== ui) {
        var message = 'Mixing ' + mochaOptions.ui + ' and ' + ui +
            ' Mocha styles is not supported. ' +
            'You called "' + key + '". Did you mean ' + alternate + '?';
        throw new Error(message);
    }
    if (_mochaIsSetup) {
        return;
    }
    applyExtensions();
    mochaOptions.ui = ui;
    mocha.setup(mochaOptions); // Note that the reporter is configured in run.js.
}

// You can configure WCT before it has loaded by assigning your custom
// configuration to the global `WCT`.
setup(window.WCT);
// Maybe some day we'll expose WCT as a module to whatever module registry you
// are using (aka the UMD approach), or as an es6 module.
var WCT = window.WCT = {
    // A generic place to hang data about the current suite. This object is
    // reported
    // back via the `sub-suite-start` and `sub-suite-end` events.
    share: {},
    // Until then, we get to rely on it to expose parent runners to their
    // children.
    _ChildRunner: ChildRunner,
    _reporter: undefined,
    _config: _config,
    // Public API
    /**
     * Loads suites of tests, supporting both `.js` and `.html` files.
     *
     * @param {!Array.<string>} files The files to load.
     */
    loadSuites: loadSuites,
};
// Load Process
listenForErrors();
stubInterfaces();
loadSync();
// Give any scripts on the page a chance to declare tests and muck with things.
document.addEventListener('DOMContentLoaded', function () {
    debug('DOMContentLoaded');
    ensureDependenciesPresent();
    // We need the socket built prior to building its reporter.
    CLISocket.init(function (error, socket) {
        if (error)
            throw error;
        // Are we a child of another run?
        var current = ChildRunner.current();
        var parent = current && current.parentScope.WCT._reporter;
        debug('parentReporter:', parent);
        var childSuites = activeChildSuites();
        var reportersToUse = determineReporters(socket, parent);
        // +1 for any local tests.
        var reporter = new MultiReporter(childSuites.length + 1, reportersToUse, parent);
        WCT._reporter = reporter; // For environment/compatibility.js
        // We need the reporter so that we can report errors during load.
        loadJsSuites(reporter, function (error) {
            // Let our parent know that we're about to start the tests.
            if (current)
                current.ready(error);
            if (error)
                throw error;
            // Emit any errors we've encountered up til now
            globalErrors.forEach(function onError(error) {
                reporter.emitOutOfBandTest('Test Suite Initialization', error);
            });
            runSuites(reporter, childSuites, function (error) {
                // Make sure to let our parent know that we're done.
                if (current)
                    current.done();
                if (error)
                    throw error;
            });
        });
    });
});

}());
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