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diff --git a/accessible/tests/mochitest/jsat/dom_helper.js b/accessible/tests/mochitest/jsat/dom_helper.js
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+++ b/accessible/tests/mochitest/jsat/dom_helper.js
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+'use strict';
+
+/* global getMainChromeWindow, AccessFuTest, GestureSettings, GestureTracker,
+   SimpleTest, getBoundsForDOMElm, Point, Utils */
+/* exported loadJSON, eventMap */
+
+var Ci = Components.interfaces;
+var Cu = Components.utils;
+
+Cu.import('resource://gre/modules/Geometry.jsm');
+
+var win = getMainChromeWindow(window);
+
+/**
+ * Convert inch based point coordinates into pixels.
+ * @param  {Array} aPoints Array of coordinates in inches.
+ * @return {Array} Array of coordinates in pixels.
+ */
+function convertPointCoordinates(aPoints) {
+  var dpi = Utils.dpi;
+  return aPoints.map(function convert(aPoint) {
+    return {
+      x: aPoint.x * dpi,
+      y: aPoint.y * dpi,
+      identifier: aPoint.identifier
+    };
+  });
+}
+
+/**
+ * For a given list of points calculate their coordinates in relation to the
+ * document body.
+ * @param  {Array} aTouchPoints An array of objects of the following format: {
+ *   base: {String}, // Id of an element to server as a base for the touch.
+ *   x: {Number},    // An optional x offset from the base element's geometric
+ *                   // centre.
+ *   y: {Number}     // An optional y offset from the base element's geometric
+ *                   // centre.
+ * }
+ * @return {JSON} An array of {x, y} coordinations.
+ */
+function calculateTouchListCoordinates(aTouchPoints) {
+  var coords = [];
+  for (var i = 0, target = aTouchPoints[i]; i < aTouchPoints.length; ++i) {
+    var bounds = getBoundsForDOMElm(target.base);
+    var parentBounds = getBoundsForDOMElm('root');
+    var point = new Point(target.x || 0, target.y || 0);
+    point.scale(Utils.dpi);
+    point.add(bounds[0], bounds[1]);
+    point.add(bounds[2] / 2, bounds[3] / 2);
+    point.subtract(parentBounds[0], parentBounds[0]);
+    coords.push({
+      x: point.x,
+      y: point.y
+    });
+  }
+  return coords;
+}
+
+/**
+ * Send a touch event with specified touchPoints.
+ * @param  {Array} aTouchPoints An array of points to be associated with
+ * touches.
+ * @param  {String} aName A name of the touch event.
+ */
+function sendTouchEvent(aTouchPoints, aName) {
+  var touchList = sendTouchEvent.touchList;
+  if (aName === 'touchend') {
+    sendTouchEvent.touchList = null;
+  } else {
+    var coords = calculateTouchListCoordinates(aTouchPoints);
+    var touches = [];
+    for (var i = 0; i < coords.length; ++i) {
+      var {x, y} = coords[i];
+      var node = document.elementFromPoint(x, y);
+      var touch = document.createTouch(window, node, aName === 'touchstart' ?
+        1 : touchList.item(i).identifier, x, y, x, y);
+      touches.push(touch);
+    }
+    touchList = document.createTouchList(touches);
+    sendTouchEvent.touchList = touchList;
+  }
+  var evt = document.createEvent('TouchEvent');
+  evt.initTouchEvent(aName, true, true, window, 0, false, false, false, false,
+    touchList, touchList, touchList);
+  document.dispatchEvent(evt);
+}
+
+sendTouchEvent.touchList = null;
+
+/**
+ * A map of event names to the functions that actually send them.
+ * @type {Object}
+ */
+var eventMap = {
+  touchstart: sendTouchEvent,
+  touchend: sendTouchEvent,
+  touchmove: sendTouchEvent
+};
+
+/**
+ * Attach a listener for the mozAccessFuGesture event that tests its
+ * type.
+ * @param  {Array} aExpectedGestures A stack of expected event types.
+ * @param  {String} aTitle Title of this sequence, if any.
+ * Note: the listener is removed once the stack reaches 0.
+ */
+function testMozAccessFuGesture(aExpectedGestures, aTitle) {
+  var types = aExpectedGestures;
+  function handleGesture(aEvent) {
+    if (aEvent.detail.type !== types[0].type) {
+      info('Got ' + aEvent.detail.type + ' waiting for ' + types[0].type);
+      // The is not the event of interest.
+      return;
+    }
+    is(!!aEvent.detail.edge, !!types[0].edge);
+    is(aEvent.detail.touches.length, types[0].fingers || 1,
+      'failed to count fingers: ' + types[0].type);
+    ok(true, 'Received correct mozAccessFuGesture: ' +
+      JSON.stringify(types.shift()) + '. (' + aTitle + ')');
+    if (types.length === 0) {
+      win.removeEventListener('mozAccessFuGesture', handleGesture);
+      if (AccessFuTest.sequenceCleanup) {
+        AccessFuTest.sequenceCleanup();
+      }
+      AccessFuTest.nextTest();
+    }
+  }
+  win.addEventListener('mozAccessFuGesture', handleGesture);
+}
+
+/**
+ * Reset the thresholds and max delays that affect gesture rejection.
+ * @param {Number} aTimeStamp Gesture time stamp.
+ * @param {Boolean} aRemoveDwellThreshold An optional flag to reset dwell
+ * threshold.
+ * @param {Boolean} aRemoveSwipeMaxDuration An optional flag to reset swipe max
+ * duration.
+ */
+function setTimers(aTimeStamp, aRemoveDwellThreshold, aRemoveSwipeMaxDuration) {
+  if (!aRemoveDwellThreshold && !aRemoveSwipeMaxDuration) {
+    return;
+  }
+  if (aRemoveDwellThreshold) {
+    GestureSettings.dwellThreshold = 0;
+  }
+  if (aRemoveSwipeMaxDuration) {
+    GestureSettings.swipeMaxDuration = 0;
+  }
+  GestureTracker.current.clearTimer();
+  GestureTracker.current.startTimer(aTimeStamp);
+}
+
+function resetTimers(aRemoveGestureResolveDelay) {
+  GestureSettings.dwellThreshold = AccessFuTest.dwellThreshold;
+  GestureSettings.swipeMaxDuration = AccessFuTest.swipeMaxDuration;
+  GestureSettings.maxGestureResolveTimeout = aRemoveGestureResolveDelay ?
+    0 : AccessFuTest.maxGestureResolveTimeout;
+}
+
+/**
+ * An extention to AccessFuTest that adds an ability to test a sequence of
+ * pointer events and their expected mozAccessFuGesture events.
+ * @param {Object} aSequence An object that has a list of pointer events to be
+ * generated and the expected mozAccessFuGesture events.
+ */
+AccessFuTest.addSequence = function AccessFuTest_addSequence(aSequence) {
+  AccessFuTest.addFunc(function testSequence() {
+    testMozAccessFuGesture(aSequence.expectedGestures, aSequence.title);
+    var events = aSequence.events;
+    function fireEvent(aEvent) {
+      var event = {
+        points: convertPointCoordinates(aEvent.points),
+        type: aEvent.type
+      };
+      var timeStamp = Date.now();
+      resetTimers(aEvent.removeGestureResolveDelay);
+      GestureTracker.handle(event, timeStamp);
+      setTimers(timeStamp, aEvent.removeDwellThreshold,
+        aEvent.removeSwipeMaxDuration);
+      processEvents();
+    }
+    function processEvents() {
+      if (events.length === 0) {
+        return;
+      }
+      var event = events.shift();
+      SimpleTest.executeSoon(function() {
+        fireEvent(event);
+      });
+    }
+    processEvents();
+  });
+};
+
+/**
+ * A helper function that loads JSON files.
+ * @param {String} aPath A path to a JSON file.
+ * @param {Function} aCallback A callback to be called on success.
+ */
+function loadJSON(aPath, aCallback) {
+  var request = new XMLHttpRequest();
+  request.open('GET', aPath, true);
+  request.responseType = 'json';
+  request.onload = function onload() {
+    aCallback(request.response);
+  };
+  request.send();
+}