Added base template for config ui.

appengine/config_service/ui/bower_components/web-component-tester/browser.js

Index: appengine/config_service/ui/bower_components/web-component-tester/browser.js
diff --git a/appengine/config_service/ui/bower_components/web-component-tester/browser.js b/appengine/config_service/ui/bower_components/web-component-tester/browser.js
new file mode 100644
index 0000000000000000000000000000000000000000..0999f4ea4b70eb41fa982661f67cb2f774d2257a
--- /dev/null
+++ b/appengine/config_service/ui/bower_components/web-component-tester/browser.js
@@ -0,0 +1,2054 @@
+/**
+ * @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';
+
+/**
+ * @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();
+  }
+}
+
+/**
+ * @param {number} count
+ * @param {string} kind
+ * @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_args) {
+  if (!get('verbose')) return;
+  var args = [window.location.pathname];
+  args.push.apply(args, arguments);
+  (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(opt_query) {
+  var query = typeof opt_query === 'string' ? opt_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('&')) : '';
+}
+
+/**
+ * @param {!Location|string} location
+ * @return {string}
+ */
+function basePath(location) {
+  return (location.pathname || location).match(/^.*\//)[0];
+}
+
+/**
+ * @param {!Location|string} location
+ * @param {string} basePath
+ * @return {string}
+ */
+function relativeLocation(location, basePath) {
+  var path = location.pathname || location;
+  if (path.indexOf(basePath) === 0) {
+    path = path.substring(basePath.length);
+  }
+  return path;
+}
+
+/**
+ * @param {!Location|string} location
+ * @return {string}
+ */
+function cleanLocation(location) {
+  var path = location.pathname || location;
+  if (path.slice(-11) === '/index.html') {
+    path = path.slice(0, path.length - 10);
+  }
+  return path;
+}
+
+/**
+ * Like `async.parallelLimit`, but our own so that we don't force a dependency
+ * on downstream code.
+ *
+ * @param {!Array<function(function(*))>} runners Runners that call their given
+ *     Node-style callback when done.
+ * @param {number|function(*)} limit Maximum number of concurrent runners.
+ *     (optional).
+ * @param {?function(*)} done Callback that should be triggered once all runners
+ *     have completed, or encountered an error.
+ */
+function parallel(runners, limit, done) {
+  if (typeof limit !== 'number') {
+    done = limit;
+    limit = 0;
+  }
+  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
+});
+
+// TODO(thedeeno): Consider renaming subsuite. IIRC, childRunner is entirely
+// distinct from mocha suite, which tripped me up badly when trying to add
+// plugin support. Perhaps something like 'batch', or 'bundle'. Something that
+// has no mocha correlate. This may also eliminate the need for root/non-root
+// suite distinctions.
+
+/**
+ * A Mocha suite (or suites) run within a child iframe, but reported as if they
+ * are part of the current context.
+ */
+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';
+}
+
+// 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} 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);
+
+  // 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 done() {
+  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;
+  }.bind(this), 1);
+};
+
+ChildRunner.prototype.signalRunComplete = function signalRunComplete(error) {
+  if (!this.onRunComplete) return;
+  this.state = 'complete';
+  this.onRunComplete(error);
+  this.onRunComplete = null;
+};
+
+/**
+ * The global configuration state for WCT's browser client.
+ */
+var _config = {
+  /**
+   * `.js` scripts to be loaded (synchronously) before WCT starts in earnest.
+   *
+   * Paths are relative to `scriptPrefix`.
+   */
+  environmentScripts: [
+    '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: [
+    'test-fixture/test-fixture.html'
+  ],
+
+  /** Absolute root for client scripts. Detected in `setup()` if not set. */
+  root: null,
+
+  /** By default, we wait for any web component frameworks to load. */
+  waitForFrameworks: true,
+
+  /** Alternate callback for waiting for tests.
+   * `this` for the callback will be the window currently running tests.
+   */
+  waitFor: null,
+
+  /** How many `.html` suites that can be concurrently loaded & run. */
+  numConcurrentSuites: 1,
+
+  /** Whether `console.error` should be treated as a test failure. */
+  trackConsoleError: true,
+
+  /** Configuration passed to mocha.setup. */
+  mochaOptions: {
+    timeout: 10 * 1000
+  },
+
+  /** Whether WCT should emit (extremely verbose) debugging log messages. */
+  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.
+ *
+ * @param {string} key
+ * @return {*}
+ */
+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];
+    }
+  });
+}
+
+var htmlSuites$1 = [];
+var jsSuites$1 = [];
+
+// We process grep ourselves to avoid loading suites that will be filtered.
+var GREP = getParam('grep');
+// work around mocha bug (https://github.com/mochajs/mocha/issues/2070)
+if (GREP) {
+  GREP = GREP.replace(/\\\./g, '.');
+}
+
+/**
+ * Loads suites of tests, supporting both `.js` and `.html` files.
+ *
+ * @param {!Array.<string>} files The files to load.
+ */
+function loadSuites(files) {
+  files.forEach(function(file) {
+    if (/\.js(\?.*)?$/.test(file)) {
+      jsSuites$1.push(file);
+    } else if (/\.html(\?.*)?$/.test(file)) {
+      htmlSuites$1.push(file);
+    } else {
+      throw new Error('Unknown resource type: ' + file);
+    }
+  });
+}
+
+/**
+ * @return {!Array.<string>} 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; 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.
+ *
+ * @param {!MultiReporter} reporter
+ * @param {function} done
+ */
+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);
+}
+
+/**
+ * @param {!MultiReporter} reporter
+ * @param {!Array.<string>} childSuites
+ * @param {function} 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(function() {
+      _fixCustomElements();
+      _runMocha(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);
+    });
+  }
+}
+/**
+ * In Chrome57 custom elements in the document might not get upgraded when
+ * there is a high GC https://bugs.chromium.org/p/chromium/issues/detail?id=701601
+ * We clone and replace the ones that weren't upgraded.
+ */
+function _fixCustomElements() {
+  // Bail out if it is not Chrome 57.
+  var raw = navigator.userAgent.match(/Chrom(e|ium)\/([0-9]+)\./);
+  var isM57 = raw && raw[2] === '57';
+  if (!isM57) return;
+
+  var elements = document.body.querySelectorAll('*:not(script):not(style)');
+  var constructors = {};
+  for (var i = 0; i < elements.length; i++) {
+    var el = elements[i];
+    // This child has already been cloned and replaced by its parent, skip it!
+    if (!el.isConnected) continue;
+
+    var tag = el.localName;
+    // Not a custom element!
+    if (tag.indexOf('-') === -1) continue;
+
+    // Memoize correct constructors.
+    constructors[tag] = constructors[tag] || document.createElement(tag).constructor;
+    // This one was correctly upgraded.
+    if (el instanceof constructors[tag]) continue;
+
+    debug('_fixCustomElements: found non-upgraded custom element ' + el);
+    var clone = document.importNode(el, true);
+    el.parentNode.replaceChild(clone, el);
+  }
+}
+
+// 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`.
+ *
+ * @param {!Mocha.Runner} 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 logSummary() {
+  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();
+};
+
+/**
+ * @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 = 'html, body {' +
+                    '  position: relative;' +
+                    '  height: 100%;' +
+                    '  width:  100%;' +
+                    '  min-width: 900px;' +
+                    '}' +
+                    '#mocha, #subsuites {' +
+                    '  height: 100%;' +
+                    '  position: absolute;' +
+                    '  top: 0;' +
+                    '}' +
+                    '#mocha {' +
+                    '  box-sizing: border-box;' +
+                    '  margin: 0 !important;' +
+                    '  overflow-y: auto;' +
+                    '  padding: 60px 20px;' +
+                    '  right: 0;' +
+                    '  left: 500px;' +
+                    '}' +
+                    '#subsuites {' +
+                    '  -ms-flex-direction: column;' +
+                    '  -webkit-flex-direction: column;' +
+                    '  display: -ms-flexbox;' +
+                    '  display: -webkit-flex;' +
+                    '  display: flex;' +
+                    '  flex-direction: column;' +
+                    '  left: 0;' +
+                    '  width: 500px;' +
+                    '}' +
+                    '#subsuites .subsuite {' +
+                    '  border: 0;' +
+                    '  width: 100%;' +
+                    '  height: 100%;' +
+                    '}' +
+                    '#mocha .test.pass .duration {' +
+                    '  color: #555 !important;' +
+                    '}';
+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.
+ *
+ * @param {number} numSuites The number of suites that will be run, in order to
+ *     estimate the total number of tests that will be performed.
+ * @param {!Array.<!Mocha.reporters.Base>} reporters The set of reporters that
+ *     should receive the unified event stream.
+ * @param {MultiReporter} parent The parent reporter, if present.
+ */
+function MultiReporter(numSuites, reporters, parent) {
+  this.reporters = reporters.map(function(reporter) {
+    return new reporter(this);
+  }.bind(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|string} location The location this reporter represents.
+ * @return {!Mocha.reporters.Base} A reporter-like "class" for each child suite
+ *     that should be passed to `mocha.run`.
+ */
+MultiReporter.prototype.childReporter = function childReporter(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;
+  function reporter(runner) {
+    runner.name = name;
+    self.bindChildRunner(runner);
+  }
+  reporter.title = name;
+  return reporter;
+};
+
+/** Must be called once all runners have finished. */
+MultiReporter.prototype.done = function done() {
+  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 {string} title The title of the test.
+ * @param {*} opt_error An error associated with this test. If falsy, test is
+ *     considered to be passing.
+ * @param {string} opt_suiteTitle Title for the suite that's wrapping the test.
+ * @param {?boolean} opt_estimated If this test was included in the original
+ *     estimate of `numSuites`.
+ */
+MultiReporter.prototype.emitOutOfBandTest = function emitOutOfBandTest(title, opt_error, opt_suiteTitle, opt_estimated) {
+  debug('MultiReporter#emitOutOfBandTest(', arguments, ')');
+  var root = new Mocha.Suite();
+  root.title = opt_suiteTitle || '';
+  var test = new Mocha.Test(title, function() {
+  });
+  test.parent = root;
+  test.state  = opt_error ? 'failed' : 'passed';
+  test.err    = opt_error;
+
+  if (!opt_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 (opt_error) {
+    this.proxyEvent('fail', runner, test, opt_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 suiteTitle(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 bindChildRunner(runner) {
+  MOCHA_EVENTS.forEach(function(eventName) {
+    runner.on(eventName, this.proxyEvent.bind(this, eventName, runner));
+  }.bind(this));
+};
+
+/**
+ * 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 proxyEvent(eventName, runner, var_args) {
+  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(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 {string} eventName
+ * @param {!Mocha.runners.Base} runner The runner that emitted this event.
+ * @param {!Array.<*>} extraArgs
+ */
+MultiReporter.prototype.cleanEvent = function cleanEvent(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 showRootSuite(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 onRunnerStart(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 onRunnerEnd(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 flushPendingEvents() {
+  var events = this.pendingEvents;
+  this.pendingEvents = [];
+  events.forEach(function(eventArgs) {
+    this.proxyEvent.apply(this, eventArgs);
+  }.bind(this));
+};
+
+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.
+ */
+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 report() {
+  this.updateTitle();
+  this.updateFavicon();
+};
+
+/** Updates the document title with a summary of current stats. */
+Title.prototype.updateTitle = function updateTitle() {
+  if (this.stats.failures > 0) {
+    document.title = pluralizedStat(this.stats.failures, 'failing');
+  } else {
+    document.title = pluralizedStat(this.stats.passes, 'passing');
+  }
+};
+
+/**
+ * Draws an arc for the favicon status, relative to the total number of tests.
+ *
+ * @param {!CanvasRenderingContext2D} context
+ * @param {number} total
+ * @param {number} start
+ * @param {number} length
+ * @param {string} color
+ */
+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();
+}
+
+/** Updates the document's favicon w/ a summary of current stats. */
+Title.prototype.updateFavicon = function updateFavicon() {
+  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 setFavicon(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);
+};
+
+/**
+ * @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 a11ySuite = 'web-component-tester/data/a11ySuite.js';
+  var scripts = get('environmentScripts');
+  var a11ySuiteWillBeLoaded = window.__generatedByWct || scripts.indexOf(a11ySuite) > -1;
+  if (!a11ySuiteWillBeLoaded) {
+    // wct is running as a bower dependency, load a11ySuite from data/
+    scripts.push(a11ySuite);
+  }
+  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 (!Polymer.Element) {
+          Polymer.Element = function () { };
+          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`:
+            if (document.importNode.isSinonProxy) {
+              document.importNode.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() {
+  Object.keys(MOCHA_EXPORTS).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.
+}
+
+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.
+ */
+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 observe(runner) {
+  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)});
+  }.bind(this));
+
+  runner.on('test end', function(test) {
+    this.emitEvent('test-end', {
+      state:    getState(test),
+      test:     getTitles(test),
+      duration: test.duration,
+      error:    test.err,
+    });
+  }.bind(this));
+
+  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);
+    }
+  }.bind(this));
+
+  runner.on('childRunner start', function(childRunner) {
+    this.emitEvent('sub-suite-start', childRunner.share);
+  }.bind(this));
+
+  runner.on('childRunner end', function(childRunner) {
+    this.emitEvent('sub-suite-end', childRunner.share);
+  }.bind(this));
+
+  runner.on('end', function() {
+    this.emitEvent('browser-end');
+  }.bind(this));
+};
+
+/**
+ * @param {string} event The name of the event to fire.
+ * @param {*} data Additional data to pass with the event.
+ */
+CLISocket.prototype.emitEvent = function emitEvent(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 init(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));
+    });
+  });
+};
+
+// 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';
+  }
+}
+
+/**
+ * @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 setInterval           = window.setInterval;           // jshint ignore:line
+var setTimeout$1            = window.setTimeout;            // jshint ignore:line
+var requestAnimationFrame = window.requestAnimationFrame; // jshint ignore:line
+
+/**
+ * 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
+ */
+window.safeStep = 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.
+ */
+window.testImmediate = 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
+ */
+window.testImmediateAsync = function testImmediateAsync(name, testFn) {
+  var testComplete = false;
+  var err;
+
+  test(name, function(done) {
+    var intervalId = setInterval(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
+ */
+window.flush = 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 = done;
+    done = function doneIE() {
+      Platform.performMicrotaskCheckpoint();
+      setTimeout$1(reallyDone, 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).
+  setTimeout$1(done, 0);
+};
+
+/**
+ * Advances a single animation frame.
+ *
+ * Calls `flush`, `requestAnimationFrame`, `flush`, and `callback` sequentially
+ * @param {function()} callback
+ */
+window.animationFrameFlush = function animationFrameFlush(callback) {
+  flush(function() {
+    requestAnimationFrame(function() {
+      flush(callback);
+    });
+  });
+};
+
+/**
+ * DEPRECATED: Use `flush`.
+ * @param {function} callback
+ */
+window.asyncPlatformFlush = function asyncPlatformFlush(callback) {
+  console.warn('asyncPlatformFlush is deprecated in favor of the more terse flush()');
+  return window.flush(callback);
+};
+
+/**
+ *
+ */
+window.waitFor = 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 (isNaN(intervalOrMutationEl)) {
+        intervalOrMutationEl.onMutation(intervalOrMutationEl, function() {
+          waitFor(fn, next, intervalOrMutationEl, timeout, timeoutTime);
+        });
+      } else {
+        setTimeout$1(function() {
+          waitFor(fn, next, intervalOrMutationEl, timeout, timeoutTime);
+        }, intervalOrMutationEl);
+      }
+      return;
+    }
+  }
+  next();
+};
+
+// 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.
+WCT.share = {};
+// Until then, we get to rely on it to expose parent runners to their children.
+WCT._ChildRunner = ChildRunner;
+WCT._config      = _config;
+
+
+// Public Interface
+
+/**
+ * Loads suites of tests, supporting both `.js` and `.html` files.
+ *
+ * @param {!Array.<string>} files The files to load.
+ */
+WCT.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;
+      });
+    });
+  });
+});
+
+}());
+//# sourceMappingURL=browser.js.map