Use sinon fakeXmlHttpRequest.

Change out the custom synchronous XHR to use sinon's fake XHR.
This allows to decide exactly when to respond to XHRs.

+/**
+ * Sinon.JS 1.9.0, 2014/03/05
+ *
+ * @author Christian Johansen (christian@cjohansen.no)
+ * @author Contributors: https://github.com/cjohansen/Sinon.JS/blob/master/AUTHORS
+ *
+ * (The BSD License)
+ * 
+ * Copyright (c) 2010-2014, Christian Johansen, christian@cjohansen.no
+ * All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ * 
+ *     * Redistributions of source code must retain the above copyright notice,
+ *       this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright notice,
+ *       this list of conditions and the following disclaimer in the documentation
+ *       and/or other materials provided with the distribution.
+ *     * Neither the name of Christian Johansen nor the names of his contributors
+ *       may be used to endorse or promote products derived from this software
+ *       without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*jslint eqeqeq: false, onevar: false, forin: true, nomen: false, regexp: false, plusplus: false*/
+/*global module, require, __dirname, document*/
+/**
+ * Sinon core utilities. For internal use only.
+ *
+ * @author Christian Johansen (christian@cjohansen.no)
+ * @license BSD
+ *
+ * Copyright (c) 2010-2013 Christian Johansen
+ */
+
+var sinon = (function (formatio) {
+    var div = typeof document != "undefined" && document.createElement("div");
+    var hasOwn = Object.prototype.hasOwnProperty;
+
+    function isDOMNode(obj) {
+        var success = false;
+
+        try {
+            obj.appendChild(div);
+            success = div.parentNode == obj;
+        } catch (e) {
+            return false;
+        } finally {
+            try {
+                obj.removeChild(div);
+            } catch (e) {
+                // Remove failed, not much we can do about that
+            }
+        }
+
+        return success;
+    }
+
+    function isElement(obj) {
+        return div && obj && obj.nodeType === 1 && isDOMNode(obj);
+    }
+
+    function isFunction(obj) {
+        return typeof obj === "function" || !!(obj && obj.constructor && obj.call && obj.apply);
+    }
+
+    function mirrorProperties(target, source) {
+        for (var prop in source) {
+            if (!hasOwn.call(target, prop)) {
+                target[prop] = source[prop];
+            }
+        }
+    }
+
+    function isRestorable (obj) {
+        return typeof obj === "function" && typeof obj.restore === "function" && obj.restore.sinon;
+    }
+
+    var sinon = {
+        wrapMethod: function wrapMethod(object, property, method) {
+            if (!object) {
+                throw new TypeError("Should wrap property of object");
+            }
+
+            if (typeof method != "function") {
+                throw new TypeError("Method wrapper should be function");
+            }
+
+            var wrappedMethod = object[property],
+                error;
+
+            if (!isFunction(wrappedMethod)) {
+                error = new TypeError("Attempted to wrap " + (typeof wrappedMethod) + " property " +
+                                    property + " as function");
+            }
+
+            if (wrappedMethod.restore && wrappedMethod.restore.sinon) {
+                error = new TypeError("Attempted to wrap " + property + " which is already wrapped");
+            }
+
+            if (wrappedMethod.calledBefore) {
+                var verb = !!wrappedMethod.returns ? "stubbed" : "spied on";
+                error = new TypeError("Attempted to wrap " + property + " which is already " + verb);
+            }
+
+            if (error) {
+                if (wrappedMethod._stack) {
+                    error.stack += '\n--------------\n' + wrappedMethod._stack;
+                }
+                throw error;
+            }
+
+            // IE 8 does not support hasOwnProperty on the window object and Firefox has a problem
+            // when using hasOwn.call on objects from other frames.
+            var owned = object.hasOwnProperty ? object.hasOwnProperty(property) : hasOwn.call(object, property);
+            object[property] = method;
+            method.displayName = property;
+            // Set up a stack trace which can be used later to find what line of
+            // code the original method was created on.
+            method._stack = (new Error('Stack Trace for original')).stack;
+
+            method.restore = function () {
+                // For prototype properties try to reset by delete first.
+                // If this fails (ex: localStorage on mobile safari) then force a reset
+                // via direct assignment.
+                if (!owned) {
+                    delete object[property];
+                }
+                if (object[property] === method) {
+                    object[property] = wrappedMethod;
+                }
+            };
+
+            method.restore.sinon = true;
+            mirrorProperties(method, wrappedMethod);
+
+            return method;
+        },
+
+        extend: function extend(target) {
+            for (var i = 1, l = arguments.length; i < l; i += 1) {
+                for (var prop in arguments[i]) {
+                    if (arguments[i].hasOwnProperty(prop)) {
+                        target[prop] = arguments[i][prop];
+                    }
+
+                    // DONT ENUM bug, only care about toString
+                    if (arguments[i].hasOwnProperty("toString") &&
+                        arguments[i].toString != target.toString) {
+                        target.toString = arguments[i].toString;
+                    }
+                }
+            }
+
+            return target;
+        },
+
+        create: function create(proto) {
+            var F = function () {};
+            F.prototype = proto;
+            return new F();
+        },
+
+        deepEqual: function deepEqual(a, b) {
+            if (sinon.match && sinon.match.isMatcher(a)) {
+                return a.test(b);
+            }
+            if (typeof a != "object" || typeof b != "object") {
+                return a === b;
+            }
+
+            if (isElement(a) || isElement(b)) {
+                return a === b;
+            }
+
+            if (a === b) {
+                return true;
+            }
+
+            if ((a === null && b !== null) || (a !== null && b === null)) {
+                return false;
+            }
+
+            if (a instanceof RegExp && b instanceof RegExp) {
+              return (a.source === b.source) && (a.global === b.global) && 
+                (a.ignoreCase === b.ignoreCase) && (a.multiline === b.multiline);
+            }
+
+            var aString = Object.prototype.toString.call(a);
+            if (aString != Object.prototype.toString.call(b)) {
+                return false;
+            }
+
+            if (aString == "[object Date]") {
+                return a.valueOf() === b.valueOf();
+            }
+
+            var prop, aLength = 0, bLength = 0;
+
+            if (aString == "[object Array]" && a.length !== b.length) {
+                return false;
+            }
+
+            for (prop in a) {
+                aLength += 1;
+
+                if (!deepEqual(a[prop], b[prop])) {
+                    return false;
+                }
+            }
+
+            for (prop in b) {
+                bLength += 1;
+            }
+
+            return aLength == bLength;
+        },
+
+        functionName: function functionName(func) {
+            var name = func.displayName || func.name;
+
+            // Use function decomposition as a last resort to get function
+            // name. Does not rely on function decomposition to work - if it
+            // doesn't debugging will be slightly less informative
+            // (i.e. toString will say 'spy' rather than 'myFunc').
+            if (!name) {
+                var matches = func.toString().match(/function ([^\s\(]+)/);
+                name = matches && matches[1];
+            }
+
+            return name;
+        },
+
+        functionToString: function toString() {
+            if (this.getCall && this.callCount) {
+                var thisValue, prop, i = this.callCount;
+
+                while (i--) {
+                    thisValue = this.getCall(i).thisValue;
+
+                    for (prop in thisValue) {
+                        if (thisValue[prop] === this) {
+                            return prop;
+                        }
+                    }
+                }
+            }
+
+            return this.displayName || "sinon fake";
+        },
+
+        getConfig: function (custom) {
+            var config = {};
+            custom = custom || {};
+            var defaults = sinon.defaultConfig;
+
+            for (var prop in defaults) {
+                if (defaults.hasOwnProperty(prop)) {
+                    config[prop] = custom.hasOwnProperty(prop) ? custom[prop] : defaults[prop];
+                }
+            }
+
+            return config;
+        },
+
+        format: function (val) {
+            return "" + val;
+        },
+
+        defaultConfig: {
+            injectIntoThis: true,
+            injectInto: null,
+            properties: ["spy", "stub", "mock", "clock", "server", "requests"],
+            useFakeTimers: true,
+            useFakeServer: true
+        },
+
+        timesInWords: function timesInWords(count) {
+            return count == 1 && "once" ||
+                count == 2 && "twice" ||
+                count == 3 && "thrice" ||
+                (count || 0) + " times";
+        },
+
+        calledInOrder: function (spies) {
+            for (var i = 1, l = spies.length; i < l; i++) {
+                if (!spies[i - 1].calledBefore(spies[i]) || !spies[i].called) {
+                    return false;
+                }
+            }
+
+            return true;
+        },
+
+        orderByFirstCall: function (spies) {
+            return spies.sort(function (a, b) {
+                // uuid, won't ever be equal
+                var aCall = a.getCall(0);
+                var bCall = b.getCall(0);
+                var aId = aCall && aCall.callId || -1;
+                var bId = bCall && bCall.callId || -1;
+
+                return aId < bId ? -1 : 1;
+            });
+        },
+
+        log: function () {},
+
+        logError: function (label, err) {
+            var msg = label + " threw exception: ";
+            sinon.log(msg + "[" + err.name + "] " + err.message);
+            if (err.stack) { sinon.log(err.stack); }
+
+            setTimeout(function () {
+                err.message = msg + err.message;
+                throw err;
+            }, 0);
+        },
+
+        typeOf: function (value) {
+            if (value === null) {
+                return "null";
+            }
+            else if (value === undefined) {
+                return "undefined";
+            }
+            var string = Object.prototype.toString.call(value);
+            return string.substring(8, string.length - 1).toLowerCase();
+        },
+
+        createStubInstance: function (constructor) {
+            if (typeof constructor !== "function") {
+                throw new TypeError("The constructor should be a function.");
+            }
+            return sinon.stub(sinon.create(constructor.prototype));
+        },
+
+        restore: function (object) {
+            if (object !== null && typeof object === "object") {
+                for (var prop in object) {
+                    if (isRestorable(object[prop])) {
+                        object[prop].restore();
+                    }
+                }
+            }
+            else if (isRestorable(object)) {
+                object.restore();
+            }
+        }
+    };
+
+    var isNode = typeof module !== "undefined" && module.exports;
+    var isAMD = typeof define === 'function' && typeof define.amd === 'object' && define.amd;
+
+    if (isAMD) {
+        define(function(){
+            return sinon;
+        });
+    } else if (isNode) {
+        try {
+            formatio = require("formatio");
+        } catch (e) {}
+        module.exports = sinon;
+        module.exports.spy = require("./sinon/spy");
+        module.exports.spyCall = require("./sinon/call");
+        module.exports.behavior = require("./sinon/behavior");
+        module.exports.stub = require("./sinon/stub");
+        module.exports.mock = require("./sinon/mock");
+        module.exports.collection = require("./sinon/collection");
+        module.exports.assert = require("./sinon/assert");
+        module.exports.sandbox = require("./sinon/sandbox");
+        module.exports.test = require("./sinon/test");
+        module.exports.testCase = require("./sinon/test_case");
+        module.exports.assert = require("./sinon/assert");
+        module.exports.match = require("./sinon/match");
+    }
+
+    if (formatio) {
+        var formatter = formatio.configure({ quoteStrings: false });
+        sinon.format = function () {
+            return formatter.ascii.apply(formatter, arguments);
+        };
+    } else if (isNode) {
+        try {
+            var util = require("util");
+            sinon.format = function (value) {
+                return typeof value == "object" && value.toString === Object.prototype.toString ? util.inspect(value) : value;
+            };
+        } catch (e) {
+            /* Node, but no util module - would be very old, but better safe than
+             sorry */
+        }
+    }
+
+    return sinon;
+}(typeof formatio == "object" && formatio));
+
+/*jslint eqeqeq: false, onevar: false*/
+/*global sinon, module, require, ActiveXObject, XMLHttpRequest, DOMParser*/
+/**
+ * Minimal Event interface implementation
+ *
+ * Original implementation by Sven Fuchs: https://gist.github.com/995028
+ * Modifications and tests by Christian Johansen.
+ *
+ * @author Sven Fuchs (svenfuchs@artweb-design.de)
+ * @author Christian Johansen (christian@cjohansen.no)
+ * @license BSD
+ *
+ * Copyright (c) 2011 Sven Fuchs, Christian Johansen
+ */
+
+if (typeof sinon == "undefined") {
+    this.sinon = {};
+}
+
+(function () {
+    var push = [].push;
+
+    sinon.Event = function Event(type, bubbles, cancelable, target) {
+        this.initEvent(type, bubbles, cancelable, target);
+    };
+
+    sinon.Event.prototype = {
+        initEvent: function(type, bubbles, cancelable, target) {
+            this.type = type;
+            this.bubbles = bubbles;
+            this.cancelable = cancelable;
+            this.target = target;
+        },
+
+        stopPropagation: function () {},
+
+        preventDefault: function () {
+            this.defaultPrevented = true;
+        }
+    };
+
+    sinon.ProgressEvent = function ProgressEvent(type, progressEventRaw, target) {
+        this.initEvent(type, false, false, target);
+        this.loaded = progressEventRaw.loaded || null;
+        this.total = progressEventRaw.total || null;
+    };
+
+    sinon.ProgressEvent.prototype = new sinon.Event();
+
+    sinon.ProgressEvent.prototype.constructor =  sinon.ProgressEvent;
+
+    sinon.CustomEvent = function CustomEvent(type, customData, target) {
+        this.initEvent(type, false, false, target);
+        this.detail = customData.detail || null;
+    };
+
+    sinon.CustomEvent.prototype = new sinon.Event();
+
+    sinon.CustomEvent.prototype.constructor =  sinon.CustomEvent;
+
+    sinon.EventTarget = {
+        addEventListener: function addEventListener(event, listener) {
+            this.eventListeners = this.eventListeners || {};
+            this.eventListeners[event] = this.eventListeners[event] || [];
+            push.call(this.eventListeners[event], listener);
+        },
+
+        removeEventListener: function removeEventListener(event, listener) {
+            var listeners = this.eventListeners && this.eventListeners[event] || [];
+
+            for (var i = 0, l = listeners.length; i < l; ++i) {
+                if (listeners[i] == listener) {
+                    return listeners.splice(i, 1);
+                }
+            }
+        },
+
+        dispatchEvent: function dispatchEvent(event) {
+            var type = event.type;
+            var listeners = this.eventListeners && this.eventListeners[type] || [];
+
+            for (var i = 0; i < listeners.length; i++) {
+                if (typeof listeners[i] == "function") {
+                    listeners[i].call(this, event);
+                } else {
+                    listeners[i].handleEvent(event);
+                }
+            }
+
+            return !!event.defaultPrevented;
+        }
+    };
+}());
+
+/**
+ * @depend ../../sinon.js
+ * @depend event.js
+ */
+/*jslint eqeqeq: false, onevar: false*/
+/*global sinon, module, require, ActiveXObject, XMLHttpRequest, DOMParser*/
+/**
+ * Fake XMLHttpRequest object
+ *
+ * @author Christian Johansen (christian@cjohansen.no)
+ * @license BSD
+ *
+ * Copyright (c) 2010-2013 Christian Johansen
+ */
+
+// wrapper for global
+(function(global) {
+    if (typeof sinon === "undefined") {
+        global.sinon = {};
+    }
+
+    var supportsProgress = typeof ProgressEvent !== "undefined";
+    var supportsCustomEvent = typeof CustomEvent !== "undefined";
+    sinon.xhr = { XMLHttpRequest: global.XMLHttpRequest };
+    var xhr = sinon.xhr;
+    xhr.GlobalXMLHttpRequest = global.XMLHttpRequest;
+    xhr.GlobalActiveXObject = global.ActiveXObject;
+    xhr.supportsActiveX = typeof xhr.GlobalActiveXObject != "undefined";
+    xhr.supportsXHR = typeof xhr.GlobalXMLHttpRequest != "undefined";
+    xhr.workingXHR = xhr.supportsXHR ? xhr.GlobalXMLHttpRequest : xhr.supportsActiveX
+                                     ? function() { return new xhr.GlobalActiveXObject("MSXML2.XMLHTTP.3.0") } : false;
+    xhr.supportsCORS = 'withCredentials' in (new sinon.xhr.GlobalXMLHttpRequest());
+
+    /*jsl:ignore*/
+    var unsafeHeaders = {
+        "Accept-Charset": true,
+        "Accept-Encoding": true,
+        "Connection": true,
+        "Content-Length": true,
+        "Cookie": true,
+        "Cookie2": true,
+        "Content-Transfer-Encoding": true,
+        "Date": true,
+        "Expect": true,
+        "Host": true,
+        "Keep-Alive": true,
+        "Referer": true,
+        "TE": true,
+        "Trailer": true,
+        "Transfer-Encoding": true,
+        "Upgrade": true,
+        "User-Agent": true,
+        "Via": true
+    };
+    /*jsl:end*/
+
+    function FakeXMLHttpRequest() {
+        this.readyState = FakeXMLHttpRequest.UNSENT;
+        this.requestHeaders = {};
+        this.requestBody = null;
+        this.status = 0;
+        this.statusText = "";
+        this.upload = new UploadProgress();
+        if (sinon.xhr.supportsCORS) {
+            this.withCredentials = false;
+        }
+
+
+        var xhr = this;
+        var events = ["loadstart", "load", "abort", "loadend"];
+
+        function addEventListener(eventName) {
+            xhr.addEventListener(eventName, function (event) {
+                var listener = xhr["on" + eventName];
+
+                if (listener && typeof listener == "function") {
+                    listener.call(this, event);
+                }
+            });
+        }
+
+        for (var i = events.length - 1; i >= 0; i--) {
+            addEventListener(events[i]);
+        }
+
+        if (typeof FakeXMLHttpRequest.onCreate == "function") {
+            FakeXMLHttpRequest.onCreate(this);
+        }
+    }
+
+    // An upload object is created for each
+    // FakeXMLHttpRequest and allows upload
+    // events to be simulated using uploadProgress
+    // and uploadError.
+    function UploadProgress() {
+        this.eventListeners = {
+            "progress": [],
+            "load": [],
+            "abort": [],
+            "error": []
+        }
+    }
+
+    UploadProgress.prototype.addEventListener = function(event, listener) {
+        this.eventListeners[event].push(listener);
+    };
+
+    UploadProgress.prototype.removeEventListener = function(event, listener) {
+        var listeners = this.eventListeners[event] || [];
+
+        for (var i = 0, l = listeners.length; i < l; ++i) {
+            if (listeners[i] == listener) {
+                return listeners.splice(i, 1);
+            }
+        }
+    };
+
+    UploadProgress.prototype.dispatchEvent = function(event) {
+        var listeners = this.eventListeners[event.type] || [];
+
+        for (var i = 0, listener; (listener = listeners[i]) != null; i++) {
+            listener(event);
+        }
+    };
+
+    function verifyState(xhr) {
+        if (xhr.readyState !== FakeXMLHttpRequest.OPENED) {
+            throw new Error("INVALID_STATE_ERR");
+        }
+
+        if (xhr.sendFlag) {
+            throw new Error("INVALID_STATE_ERR");
+        }
+    }
+
+    // filtering to enable a white-list version of Sinon FakeXhr,
+    // where whitelisted requests are passed through to real XHR
+    function each(collection, callback) {
+        if (!collection) return;
+        for (var i = 0, l = collection.length; i < l; i += 1) {
+            callback(collection[i]);
+        }
+    }
+    function some(collection, callback) {
+        for (var index = 0; index < collection.length; index++) {
+            if(callback(collection[index]) === true) return true;
+        }
+        return false;
+    }
+    // largest arity in XHR is 5 - XHR#open
+    var apply = function(obj,method,args) {
+        switch(args.length) {
+        case 0: return obj[method]();
+        case 1: return obj[method](args[0]);
+        case 2: return obj[method](args[0],args[1]);
+        case 3: return obj[method](args[0],args[1],args[2]);
+        case 4: return obj[method](args[0],args[1],args[2],args[3]);
+        case 5: return obj[method](args[0],args[1],args[2],args[3],args[4]);
+        }
+    };
+
+    FakeXMLHttpRequest.filters = [];
+    FakeXMLHttpRequest.addFilter = function(fn) {
+        this.filters.push(fn)
+    };
+    var IE6Re = /MSIE 6/;
+    FakeXMLHttpRequest.defake = function(fakeXhr,xhrArgs) {
+        var xhr = new sinon.xhr.workingXHR();
+        each(["open","setRequestHeader","send","abort","getResponseHeader",
+              "getAllResponseHeaders","addEventListener","overrideMimeType","removeEventListener"],
+             function(method) {
+                 fakeXhr[method] = function() {
+                   return apply(xhr,method,arguments);
+                 };
+             });
+
+        var copyAttrs = function(args) {
+            each(args, function(attr) {
+              try {
+                fakeXhr[attr] = xhr[attr]
+              } catch(e) {
+                if(!IE6Re.test(navigator.userAgent)) throw e;
+              }
+            });
+        };
+
+        var stateChange = function() {
+            fakeXhr.readyState = xhr.readyState;
+            if(xhr.readyState >= FakeXMLHttpRequest.HEADERS_RECEIVED) {
+                copyAttrs(["status","statusText"]);
+            }
+            if(xhr.readyState >= FakeXMLHttpRequest.LOADING) {
+                copyAttrs(["responseText"]);
+            }
+            if(xhr.readyState === FakeXMLHttpRequest.DONE) {
+                copyAttrs(["responseXML"]);
+            }
+            if(fakeXhr.onreadystatechange) fakeXhr.onreadystatechange.call(fakeXhr, { target: fakeXhr });
+        };
+        if(xhr.addEventListener) {
+          for(var event in fakeXhr.eventListeners) {
+              if(fakeXhr.eventListeners.hasOwnProperty(event)) {
+                  each(fakeXhr.eventListeners[event],function(handler) {
+                      xhr.addEventListener(event, handler);
+                  });
+              }
+          }
+          xhr.addEventListener("readystatechange",stateChange);
+        } else {
+          xhr.onreadystatechange = stateChange;
+        }
+        apply(xhr,"open",xhrArgs);
+    };
+    FakeXMLHttpRequest.useFilters = false;
+
+    function verifyRequestOpened(xhr) {
+        if (xhr.readyState != FakeXMLHttpRequest.OPENED) {
+            throw new Error("INVALID_STATE_ERR - " + xhr.readyState);
+        }
+    }
+
+    function verifyRequestSent(xhr) {
+        if (xhr.readyState == FakeXMLHttpRequest.DONE) {
+            throw new Error("Request done");
+        }
+    }
+
+    function verifyHeadersReceived(xhr) {
+        if (xhr.async && xhr.readyState != FakeXMLHttpRequest.HEADERS_RECEIVED) {
+            throw new Error("No headers received");
+        }
+    }
+
+    function verifyResponseBodyType(body) {
+        if (typeof body != "string") {
+            var error = new Error("Attempted to respond to fake XMLHttpRequest with " +
+                                 body + ", which is not a string.");
+            error.name = "InvalidBodyException";
+            throw error;
+        }
+    }
+
+    sinon.extend(FakeXMLHttpRequest.prototype, sinon.EventTarget, {
+        async: true,
+
+        open: function open(method, url, async, username, password) {
+            this.method = method;
+            this.url = url;
+            this.async = typeof async == "boolean" ? async : true;
+            this.username = username;
+            this.password = password;
+            this.responseText = null;
+            this.responseXML = null;
+            this.requestHeaders = {};
+            this.sendFlag = false;
+            if(sinon.FakeXMLHttpRequest.useFilters === true) {
+                var xhrArgs = arguments;
+                var defake = some(FakeXMLHttpRequest.filters,function(filter) {
+                    return filter.apply(this,xhrArgs)
+                });
+                if (defake) {
+                  return sinon.FakeXMLHttpRequest.defake(this,arguments);
+                }
+            }
+            this.readyStateChange(FakeXMLHttpRequest.OPENED);
+        },
+
+        readyStateChange: function readyStateChange(state) {
+            this.readyState = state;
+
+            if (typeof this.onreadystatechange == "function") {
+                try {
+                    this.onreadystatechange();
+                } catch (e) {
+                    sinon.logError("Fake XHR onreadystatechange handler", e);
+                }
+            }
+
+            this.dispatchEvent(new sinon.Event("readystatechange"));
+
+            switch (this.readyState) {
+                case FakeXMLHttpRequest.DONE:
+                    this.dispatchEvent(new sinon.Event("load", false, false, this));
+                    this.dispatchEvent(new sinon.Event("loadend", false, false, this));
+                    this.upload.dispatchEvent(new sinon.Event("load", false, false, this));
+                    if (supportsProgress) {
+                        this.upload.dispatchEvent(new sinon.ProgressEvent('progress', {loaded: 100, total: 100}));
+                    }
+                    break;
+            }
+        },
+
+        setRequestHeader: function setRequestHeader(header, value) {
+            verifyState(this);
+
+            if (unsafeHeaders[header] || /^(Sec-|Proxy-)/.test(header)) {
+                throw new Error("Refused to set unsafe header \"" + header + "\"");
+            }
+
+            if (this.requestHeaders[header]) {
+                this.requestHeaders[header] += "," + value;
+            } else {
+                this.requestHeaders[header] = value;
+            }
+        },
+
+        // Helps testing
+        setResponseHeaders: function setResponseHeaders(headers) {
+            verifyRequestOpened(this);
+            this.responseHeaders = {};
+
+            for (var header in headers) {
+                if (headers.hasOwnProperty(header)) {
+                    this.responseHeaders[header] = headers[header];
+                }
+            }
+
+            if (this.async) {
+                this.readyStateChange(FakeXMLHttpRequest.HEADERS_RECEIVED);
+            } else {
+                this.readyState = FakeXMLHttpRequest.HEADERS_RECEIVED;
+            }
+        },
+
+        // Currently treats ALL data as a DOMString (i.e. no Document)
+        send: function send(data) {
+            verifyState(this);
+
+            if (!/^(get|head)$/i.test(this.method)) {
+                if (this.requestHeaders["Content-Type"]) {
+                    var value = this.requestHeaders["Content-Type"].split(";");
+                    this.requestHeaders["Content-Type"] = value[0] + ";charset=utf-8";
+                } else {
+                    this.requestHeaders["Content-Type"] = "text/plain;charset=utf-8";
+                }
+
+                this.requestBody = data;
+            }
+
+            this.errorFlag = false;
+            this.sendFlag = this.async;
+            this.readyStateChange(FakeXMLHttpRequest.OPENED);
+
+            if (typeof this.onSend == "function") {
+                this.onSend(this);
+            }
+
+            this.dispatchEvent(new sinon.Event("loadstart", false, false, this));
+        },
+
+        abort: function abort() {
+            this.aborted = true;
+            this.responseText = null;
+            this.errorFlag = true;
+            this.requestHeaders = {};
+
+            if (this.readyState > sinon.FakeXMLHttpRequest.UNSENT && this.sendFlag) {
+                this.readyStateChange(sinon.FakeXMLHttpRequest.DONE);
+                this.sendFlag = false;
+            }
+
+            this.readyState = sinon.FakeXMLHttpRequest.UNSENT;
+
+            this.dispatchEvent(new sinon.Event("abort", false, false, this));
+
+            this.upload.dispatchEvent(new sinon.Event("abort", false, false, this));
+
+            if (typeof this.onerror === "function") {
+                this.onerror();
+            }
+        },
+
+        getResponseHeader: function getResponseHeader(header) {
+            if (this.readyState < FakeXMLHttpRequest.HEADERS_RECEIVED) {
+                return null;
+            }
+
+            if (/^Set-Cookie2?$/i.test(header)) {
+                return null;
+            }
+
+            header = header.toLowerCase();
+
+            for (var h in this.responseHeaders) {
+                if (h.toLowerCase() == header) {
+                    return this.responseHeaders[h];
+                }
+            }
+
+            return null;
+        },
+
+        getAllResponseHeaders: function getAllResponseHeaders() {
+            if (this.readyState < FakeXMLHttpRequest.HEADERS_RECEIVED) {
+                return "";
+            }
+
+            var headers = "";
+
+            for (var header in this.responseHeaders) {
+                if (this.responseHeaders.hasOwnProperty(header) &&
+                    !/^Set-Cookie2?$/i.test(header)) {
+                    headers += header + ": " + this.responseHeaders[header] + "\r\n";
+                }
+            }
+
+            return headers;
+        },
+
+        setResponseBody: function setResponseBody(body) {
+            verifyRequestSent(this);
+            verifyHeadersReceived(this);
+            verifyResponseBodyType(body);
+
+            var chunkSize = this.chunkSize || 10;
+            var index = 0;
+            this.responseText = "";
+
+            do {
+                if (this.async) {
+                    this.readyStateChange(FakeXMLHttpRequest.LOADING);
+                }
+
+                this.responseText += body.substring(index, index + chunkSize);
+                index += chunkSize;
+            } while (index < body.length);
+
+            var type = this.getResponseHeader("Content-Type");
+
+            if (this.responseText &&
+                (!type || /(text\/xml)|(application\/xml)|(\+xml)/.test(type))) {
+                try {
+                    this.responseXML = FakeXMLHttpRequest.parseXML(this.responseText);
+                } catch (e) {
+                    // Unable to parse XML - no biggie
+                }
+            }
+
+            if (this.async) {
+                this.readyStateChange(FakeXMLHttpRequest.DONE);
+            } else {
+                this.readyState = FakeXMLHttpRequest.DONE;
+            }
+        },
+
+        respond: function respond(status, headers, body) {
+            this.status = typeof status == "number" ? status : 200;
+            this.statusText = FakeXMLHttpRequest.statusCodes[this.status];
+            this.setResponseHeaders(headers || {});
+            this.setResponseBody(body || "");
+        },
+
+        uploadProgress: function uploadProgress(progressEventRaw) {
+            if (supportsProgress) {
+                this.upload.dispatchEvent(new sinon.ProgressEvent("progress", progressEventRaw));
+            }
+        },
+
+        uploadError: function uploadError(error) {
+            if (supportsCustomEvent) {
+                this.upload.dispatchEvent(new sinon.CustomEvent("error", {"detail": error}));
+            }
+        }
+    });
+
+    sinon.extend(FakeXMLHttpRequest, {
+        UNSENT: 0,
+        OPENED: 1,
+        HEADERS_RECEIVED: 2,
+        LOADING: 3,
+        DONE: 4
+    });
+
+    // Borrowed from JSpec
+    FakeXMLHttpRequest.parseXML = function parseXML(text) {
+        var xmlDoc;
+
+        if (typeof DOMParser != "undefined") {
+            var parser = new DOMParser();
+            xmlDoc = parser.parseFromString(text, "text/xml");
+        } else {
+            xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
+            xmlDoc.async = "false";
+            xmlDoc.loadXML(text);
+        }
+
+        return xmlDoc;
+    };
+
+    FakeXMLHttpRequest.statusCodes = {
+        100: "Continue",
+        101: "Switching Protocols",
+        200: "OK",
+        201: "Created",
+        202: "Accepted",
+        203: "Non-Authoritative Information",
+        204: "No Content",
+        205: "Reset Content",
+        206: "Partial Content",
+        300: "Multiple Choice",
+        301: "Moved Permanently",
+        302: "Found",
+        303: "See Other",
+        304: "Not Modified",
+        305: "Use Proxy",
+        307: "Temporary Redirect",
+        400: "Bad Request",
+        401: "Unauthorized",
+        402: "Payment Required",
+        403: "Forbidden",
+        404: "Not Found",
+        405: "Method Not Allowed",
+        406: "Not Acceptable",
+        407: "Proxy Authentication Required",
+        408: "Request Timeout",
+        409: "Conflict",
+        410: "Gone",
+        411: "Length Required",
+        412: "Precondition Failed",
+        413: "Request Entity Too Large",
+        414: "Request-URI Too Long",
+        415: "Unsupported Media Type",
+        416: "Requested Range Not Satisfiable",
+        417: "Expectation Failed",
+        422: "Unprocessable Entity",
+        500: "Internal Server Error",
+        501: "Not Implemented",
+        502: "Bad Gateway",
+        503: "Service Unavailable",
+        504: "Gateway Timeout",
+        505: "HTTP Version Not Supported"
+    };
+
+    sinon.useFakeXMLHttpRequest = function () {
+        sinon.FakeXMLHttpRequest.restore = function restore(keepOnCreate) {
+            if (xhr.supportsXHR) {
+                global.XMLHttpRequest = xhr.GlobalXMLHttpRequest;
+            }
+
+            if (xhr.supportsActiveX) {
+                global.ActiveXObject = xhr.GlobalActiveXObject;
+            }
+
+            delete sinon.FakeXMLHttpRequest.restore;
+
+            if (keepOnCreate !== true) {
+                delete sinon.FakeXMLHttpRequest.onCreate;
+            }
+        };
+        if (xhr.supportsXHR) {
+            global.XMLHttpRequest = sinon.FakeXMLHttpRequest;
+        }
+
+        if (xhr.supportsActiveX) {
+            global.ActiveXObject = function ActiveXObject(objId) {
+                if (objId == "Microsoft.XMLHTTP" || /^Msxml2\.XMLHTTP/i.test(objId)) {
+
+                    return new sinon.FakeXMLHttpRequest();
+                }
+
+                return new xhr.GlobalActiveXObject(objId);
+            };
+        }
+
+        return sinon.FakeXMLHttpRequest;
+    };
+
+    sinon.FakeXMLHttpRequest = FakeXMLHttpRequest;
+
+})(typeof global === "object" ? global : this);
+
+if (typeof module !== 'undefined' && module.exports) {
+    module.exports = sinon;
+}
+
+/**
+ * @depend fake_xml_http_request.js
+ */
+/*jslint eqeqeq: false, onevar: false, regexp: false, plusplus: false*/
+/*global module, require, window*/
+/**
+ * The Sinon "server" mimics a web server that receives requests from
+ * sinon.FakeXMLHttpRequest and provides an API to respond to those requests,
+ * both synchronously and asynchronously. To respond synchronuously, canned
+ * answers have to be provided upfront.
+ *
+ * @author Christian Johansen (christian@cjohansen.no)
+ * @license BSD
+ *
+ * Copyright (c) 2010-2013 Christian Johansen
+ */
+
+if (typeof sinon == "undefined") {
+    var sinon = {};
+}
+
+sinon.fakeServer = (function () {
+    var push = [].push;
+    function F() {}
+
+    function create(proto) {
+        F.prototype = proto;
+        return new F();
+    }
+
+    function responseArray(handler) {
+        var response = handler;
+
+        if (Object.prototype.toString.call(handler) != "[object Array]") {
+            response = [200, {}, handler];
+        }
+
+        if (typeof response[2] != "string") {
+            throw new TypeError("Fake server response body should be string, but was " +
+                                typeof response[2]);
+        }
+
+        return response;
+    }
+
+    var wloc = typeof window !== "undefined" ? window.location : {};
+    var rCurrLoc = new RegExp("^" + wloc.protocol + "//" + wloc.host);
+
+    function matchOne(response, reqMethod, reqUrl) {
+        var rmeth = response.method;
+        var matchMethod = !rmeth || rmeth.toLowerCase() == reqMethod.toLowerCase();
+        var url = response.url;
+        var matchUrl = !url || url == reqUrl || (typeof url.test == "function" && url.test(reqUrl));
+
+        return matchMethod && matchUrl;
+    }
+
+    function match(response, request) {
+        var requestUrl = request.url;
+
+        if (!/^https?:\/\//.test(requestUrl) || rCurrLoc.test(requestUrl)) {
+            requestUrl = requestUrl.replace(rCurrLoc, "");
+        }
+
+        if (matchOne(response, this.getHTTPMethod(request), requestUrl)) {
+            if (typeof response.response == "function") {
+                var ru = response.url;
+                var args = [request].concat(ru && typeof ru.exec == "function" ? ru.exec(requestUrl).slice(1) : []);
+                return response.response.apply(response, args);
+            }
+
+            return true;
+        }
+
+        return false;
+    }
+
+    function log(response, request) {
+        var str;
+
+        str =  "Request:\n"  + sinon.format(request)  + "\n\n";
+        str += "Response:\n" + sinon.format(response) + "\n\n";
+
+        sinon.log(str);
+    }
+
+    return {
+        create: function () {
+            var server = create(this);
+            this.xhr = sinon.useFakeXMLHttpRequest();
+            server.requests = [];
+
+            this.xhr.onCreate = function (xhrObj) {
+                server.addRequest(xhrObj);
+            };
+
+            return server;
+        },
+
+        addRequest: function addRequest(xhrObj) {
+            var server = this;
+            push.call(this.requests, xhrObj);
+
+            xhrObj.onSend = function () {
+                server.handleRequest(this);
+
+                if (server.autoRespond && !server.responding) {
+                    setTimeout(function () {
+                        server.responding = false;
+                        server.respond();
+                    }, server.autoRespondAfter || 10);
+
+                    server.responding = true;
+                }
+            };
+        },
+
+        getHTTPMethod: function getHTTPMethod(request) {
+            if (this.fakeHTTPMethods && /post/i.test(request.method)) {
+                var matches = (request.requestBody || "").match(/_method=([^\b;]+)/);
+                return !!matches ? matches[1] : request.method;
+            }
+
+            return request.method;
+        },
+
+        handleRequest: function handleRequest(xhr) {
+            if (xhr.async) {
+                if (!this.queue) {
+                    this.queue = [];
+                }
+
+                push.call(this.queue, xhr);
+            } else {
+                this.processRequest(xhr);
+            }
+        },
+
+        respondWith: function respondWith(method, url, body) {
+            if (arguments.length == 1 && typeof method != "function") {
+                this.response = responseArray(method);
+                return;
+            }
+
+            if (!this.responses) { this.responses = []; }
+
+            if (arguments.length == 1) {
+                body = method;
+                url = method = null;
+            }
+
+            if (arguments.length == 2) {
+                body = url;
+                url = method;
+                method = null;
+            }
+
+            push.call(this.responses, {
+                method: method,
+                url: url,
+                response: typeof body == "function" ? body : responseArray(body)
+            });
+        },
+
+        respond: function respond() {
+            if (arguments.length > 0) this.respondWith.apply(this, arguments);
+            var queue = this.queue || [];
+            var requests = queue.splice(0);
+            var request;
+
+            while(request = requests.shift()) {
+                this.processRequest(request);
+            }
+        },
+
+        processRequest: function processRequest(request) {
+            try {
+                if (request.aborted) {
+                    return;
+                }
+
+                var response = this.response || [404, {}, ""];
+
+                if (this.responses) {
+                    for (var l = this.responses.length, i = l - 1; i >= 0; i--) {
+                        if (match.call(this, this.responses[i], request)) {
+                            response = this.responses[i].response;
+                            break;
+                        }
+                    }
+                }
+
+                if (request.readyState != 4) {
+                    log(response, request);
+
+                    request.respond(response[0], response[1], response[2]);
+                }
+            } catch (e) {
+                sinon.logError("Fake server request processing", e);
+            }
+        },
+
+        restore: function restore() {
+            return this.xhr.restore && this.xhr.restore.apply(this.xhr, arguments);
+        }
+    };
+}());
+
+if (typeof module !== 'undefined' && module.exports) {
+    module.exports = sinon;
+}
+
+/*jslint eqeqeq: false, plusplus: false, evil: true, onevar: false, browser: true, forin: false*/
+/*global module, require, window*/
+/**
+ * Fake timer API
+ * setTimeout
+ * setInterval
+ * clearTimeout
+ * clearInterval
+ * tick
+ * reset
+ * Date
+ *
+ * Inspired by jsUnitMockTimeOut from JsUnit
+ *
+ * @author Christian Johansen (christian@cjohansen.no)
+ * @license BSD
+ *
+ * Copyright (c) 2010-2013 Christian Johansen
+ */
+
+if (typeof sinon == "undefined") {
+    var sinon = {};
+}
+
+(function (global) {
+    var id = 1;
+
+    function addTimer(args, recurring) {
+        if (args.length === 0) {
+            throw new Error("Function requires at least 1 parameter");
+        }
+
+        if (typeof args[0] === "undefined") {
+            throw new Error("Callback must be provided to timer calls");
+        }
+
+        var toId = id++;
+        var delay = args[1] || 0;
+
+        if (!this.timeouts) {
+            this.timeouts = {};
+        }
+
+        this.timeouts[toId] = {
+            id: toId,
+            func: args[0],
+            callAt: this.now + delay,
+            invokeArgs: Array.prototype.slice.call(args, 2)
+        };
+
+        if (recurring === true) {
+            this.timeouts[toId].interval = delay;
+        }
+
+        return toId;
+    }
+
+    function parseTime(str) {
+        if (!str) {
+            return 0;
+        }
+
+        var strings = str.split(":");
+        var l = strings.length, i = l;
+        var ms = 0, parsed;
+
+        if (l > 3 || !/^(\d\d:){0,2}\d\d?$/.test(str)) {
+            throw new Error("tick only understands numbers and 'h:m:s'");
+        }
+
+        while (i--) {
+            parsed = parseInt(strings[i], 10);
+
+            if (parsed >= 60) {
+                throw new Error("Invalid time " + str);
+            }
+
+            ms += parsed * Math.pow(60, (l - i - 1));
+        }
+
+        return ms * 1000;
+    }
+
+    function createObject(object) {
+        var newObject;
+
+        if (Object.create) {
+            newObject = Object.create(object);
+        } else {
+            var F = function () {};
+            F.prototype = object;
+            newObject = new F();
+        }
+
+        newObject.Date.clock = newObject;
+        return newObject;
+    }
+
+    sinon.clock = {
+        now: 0,
+
+        create: function create(now) {
+            var clock = createObject(this);
+
+            if (typeof now == "number") {
+                clock.now = now;
+            }
+
+            if (!!now && typeof now == "object") {
+                throw new TypeError("now should be milliseconds since UNIX epoch");
+            }
+
+            return clock;
+        },
+
+        setTimeout: function setTimeout(callback, timeout) {
+            return addTimer.call(this, arguments, false);
+        },
+
+        clearTimeout: function clearTimeout(timerId) {
+            if (!this.timeouts) {
+                this.timeouts = [];
+            }
+
+            if (timerId in this.timeouts) {
+                delete this.timeouts[timerId];
+            }
+        },
+
+        setInterval: function setInterval(callback, timeout) {
+            return addTimer.call(this, arguments, true);
+        },
+
+        clearInterval: function clearInterval(timerId) {
+            this.clearTimeout(timerId);
+        },
+
+        setImmediate: function setImmediate(callback) {
+            var passThruArgs = Array.prototype.slice.call(arguments, 1);
+
+            return addTimer.call(this, [callback, 0].concat(passThruArgs), false);
+        },
+
+        clearImmediate: function clearImmediate(timerId) {
+            this.clearTimeout(timerId);
+        },
+
+        tick: function tick(ms) {
+            ms = typeof ms == "number" ? ms : parseTime(ms);
+            var tickFrom = this.now, tickTo = this.now + ms, previous = this.now;
+            var timer = this.firstTimerInRange(tickFrom, tickTo);
+
+            var firstException;
+            while (timer && tickFrom <= tickTo) {
+                if (this.timeouts[timer.id]) {
+                    tickFrom = this.now = timer.callAt;
+                    try {
+                      this.callTimer(timer);
+                    } catch (e) {
+                      firstException = firstException || e;
+                    }
+                }
+
+                timer = this.firstTimerInRange(previous, tickTo);
+                previous = tickFrom;
+            }
+
+            this.now = tickTo;
+
+            if (firstException) {
+              throw firstException;
+            }
+
+            return this.now;
+        },
+
+        firstTimerInRange: function (from, to) {
+            var timer, smallest = null, originalTimer;
+
+            for (var id in this.timeouts) {
+                if (this.timeouts.hasOwnProperty(id)) {
+                    if (this.timeouts[id].callAt < from || this.timeouts[id].callAt > to) {
+                        continue;
+                    }
+
+                    if (smallest === null || this.timeouts[id].callAt < smallest) {
+                        originalTimer = this.timeouts[id];
+                        smallest = this.timeouts[id].callAt;
+
+                        timer = {
+                            func: this.timeouts[id].func,
+                            callAt: this.timeouts[id].callAt,
+                            interval: this.timeouts[id].interval,
+                            id: this.timeouts[id].id,
+                            invokeArgs: this.timeouts[id].invokeArgs
+                        };
+                    }
+                }
+            }
+
+            return timer || null;
+        },
+
+        callTimer: function (timer) {
+            if (typeof timer.interval == "number") {
+                this.timeouts[timer.id].callAt += timer.interval;
+            } else {
+                delete this.timeouts[timer.id];
+            }
+
+            try {
+                if (typeof timer.func == "function") {
+                    timer.func.apply(null, timer.invokeArgs);
+                } else {
+                    eval(timer.func);
+                }
+            } catch (e) {
+              var exception = e;
+            }
+
+            if (!this.timeouts[timer.id]) {
+                if (exception) {
+                  throw exception;
+                }
+                return;
+            }
+
+            if (exception) {
+              throw exception;
+            }
+        },
+
+        reset: function reset() {
+            this.timeouts = {};
+        },
+
+        Date: (function () {
+            var NativeDate = Date;
+
+            function ClockDate(year, month, date, hour, minute, second, ms) {
+                // Defensive and verbose to avoid potential harm in passing
+                // explicit undefined when user does not pass argument
+                switch (arguments.length) {
+                case 0:
+                    return new NativeDate(ClockDate.clock.now);
+                case 1:
+                    return new NativeDate(year);
+                case 2:
+                    return new NativeDate(year, month);
+                case 3:
+                    return new NativeDate(year, month, date);
+                case 4:
+                    return new NativeDate(year, month, date, hour);
+                case 5:
+                    return new NativeDate(year, month, date, hour, minute);
+                case 6:
+                    return new NativeDate(year, month, date, hour, minute, second);
+                default:
+                    return new NativeDate(year, month, date, hour, minute, second, ms);
+                }
+            }
+
+            return mirrorDateProperties(ClockDate, NativeDate);
+        }())
+    };
+
+    function mirrorDateProperties(target, source) {
+        if (source.now) {
+            target.now = function now() {
+                return target.clock.now;
+            };
+        } else {
+            delete target.now;
+        }
+
+        if (source.toSource) {
+            target.toSource = function toSource() {
+                return source.toSource();
+            };
+        } else {
+            delete target.toSource;
+        }
+
+        target.toString = function toString() {
+            return source.toString();
+        };
+
+        target.prototype = source.prototype;
+        target.parse = source.parse;
+        target.UTC = source.UTC;
+        target.prototype.toUTCString = source.prototype.toUTCString;
+
+        for (var prop in source) {
+            if (source.hasOwnProperty(prop)) {
+                target[prop] = source[prop];
+            }
+        }
+
+        return target;
+    }
+
+    var methods = ["Date", "setTimeout", "setInterval",
+                   "clearTimeout", "clearInterval"];
+
+    if (typeof global.setImmediate !== "undefined") {
+        methods.push("setImmediate");
+    }
+
+    if (typeof global.clearImmediate !== "undefined") {
+        methods.push("clearImmediate");
+    }
+
+    function restore() {
+        var method;
+
+        for (var i = 0, l = this.methods.length; i < l; i++) {
+            method = this.methods[i];
+
+            if (global[method].hadOwnProperty) {
+                global[method] = this["_" + method];
+            } else {
+                try {
+                    delete global[method];
+                } catch (e) {}
+            }
+        }
+
+        // Prevent multiple executions which will completely remove these props
+        this.methods = [];
+    }
+
+    function stubGlobal(method, clock) {
+        clock[method].hadOwnProperty = Object.prototype.hasOwnProperty.call(global, method);
+        clock["_" + method] = global[method];
+
+        if (method == "Date") {
+            var date = mirrorDateProperties(clock[method], global[method]);
+            global[method] = date;
+        } else {
+            global[method] = function () {
+                return clock[method].apply(clock, arguments);
+            };
+
+            for (var prop in clock[method]) {
+                if (clock[method].hasOwnProperty(prop)) {
+                    global[method][prop] = clock[method][prop];
+                }
+            }
+        }
+
+        global[method].clock = clock;
+    }
+
+    sinon.useFakeTimers = function useFakeTimers(now) {
+        var clock = sinon.clock.create(now);
+        clock.restore = restore;
+        clock.methods = Array.prototype.slice.call(arguments,
+                                                   typeof now == "number" ? 1 : 0);
+
+        if (clock.methods.length === 0) {
+            clock.methods = methods;
+        }
+
+        for (var i = 0, l = clock.methods.length; i < l; i++) {
+            stubGlobal(clock.methods[i], clock);
+        }
+
+        return clock;
+    };
+}(typeof global != "undefined" && typeof global !== "function" ? global : this));
+
+sinon.timers = {
+    setTimeout: setTimeout,
+    clearTimeout: clearTimeout,
+    setImmediate: (typeof setImmediate !== "undefined" ? setImmediate : undefined),
+    clearImmediate: (typeof clearImmediate !== "undefined" ? clearImmediate: undefined),
+    setInterval: setInterval,
+    clearInterval: clearInterval,
+    Date: Date
+};
+
+if (typeof module !== 'undefined' && module.exports) {
+    module.exports = sinon;
+}
+
+/**
+ * @depend fake_server.js
+ * @depend fake_timers.js
+ */
+/*jslint browser: true, eqeqeq: false, onevar: false*/
+/*global sinon*/
+/**
+ * Add-on for sinon.fakeServer that automatically handles a fake timer along with
+ * the FakeXMLHttpRequest. The direct inspiration for this add-on is jQuery
+ * 1.3.x, which does not use xhr object's onreadystatehandler at all - instead,
+ * it polls the object for completion with setInterval. Dispite the direct
+ * motivation, there is nothing jQuery-specific in this file, so it can be used
+ * in any environment where the ajax implementation depends on setInterval or
+ * setTimeout.
+ *
+ * @author Christian Johansen (christian@cjohansen.no)
+ * @license BSD
+ *
+ * Copyright (c) 2010-2013 Christian Johansen
+ */
+
+(function () {
+    function Server() {}
+    Server.prototype = sinon.fakeServer;
+
+    sinon.fakeServerWithClock = new Server();
+
+    sinon.fakeServerWithClock.addRequest = function addRequest(xhr) {
+        if (xhr.async) {
+            if (typeof setTimeout.clock == "object") {
+                this.clock = setTimeout.clock;
+            } else {
+                this.clock = sinon.useFakeTimers();
+                this.resetClock = true;
+            }
+
+            if (!this.longestTimeout) {
+                var clockSetTimeout = this.clock.setTimeout;
+                var clockSetInterval = this.clock.setInterval;
+                var server = this;
+
+                this.clock.setTimeout = function (fn, timeout) {
+                    server.longestTimeout = Math.max(timeout, server.longestTimeout || 0);
+
+                    return clockSetTimeout.apply(this, arguments);
+                };
+
+                this.clock.setInterval = function (fn, timeout) {
+                    server.longestTimeout = Math.max(timeout, server.longestTimeout || 0);
+
+                    return clockSetInterval.apply(this, arguments);
+                };
+            }
+        }
+
+        return sinon.fakeServer.addRequest.call(this, xhr);
+    };
+
+    sinon.fakeServerWithClock.respond = function respond() {
+        var returnVal = sinon.fakeServer.respond.apply(this, arguments);
+
+        if (this.clock) {
+            this.clock.tick(this.longestTimeout || 0);
+            this.longestTimeout = 0;
+
+            if (this.resetClock) {
+                this.clock.restore();
+                this.resetClock = false;
+            }
+        }
+
+        return returnVal;
+    };
+
+    sinon.fakeServerWithClock.restore = function restore() {
+        if (this.clock) {
+            this.clock.restore();
+        }
+
+        return sinon.fakeServer.restore.apply(this, arguments);
+    };
+}());
+

@@ -3,6 +3,9 @@
 <head>
 <head>
   <meta charset="utf-8">
   <meta charset="utf-8">
   <title>video.js HLS Plugin Test Suite</title>
   <title>video.js HLS Plugin Test Suite</title>
+  <!-- Load sinon server for fakeXHR -->
+  <script src="../libs/sinon/sinon-server-1.9.0.js"></script>
+
   <!-- Load local QUnit. -->
   <!-- Load local QUnit. -->
   <link rel="stylesheet" href="../libs/qunit/qunit.css" media="screen">
   <link rel="stylesheet" href="../libs/qunit/qunit.css" media="screen">
   <script src="../libs/qunit/qunit.js"></script>
   <script src="../libs/qunit/qunit.js"></script>

@@ -29,6 +29,33 @@ var
   oldSourceBuffer,
   oldSourceBuffer,
   oldSupportsNativeHls,
   oldSupportsNativeHls,
   xhrUrls,
   xhrUrls,
+  requests,
+  xhr,
+
+  standardXHRResponse = function(request) {
+    if (!request.url) return;
+
+    var contentType = "application/json",
+        // contents off the global object
+        manifestName = (/(?:.*\/)?(.*)\.m3u8/).exec(request.url);
+
+    if (manifestName) {
+      manifestName = manifestName[1];
+    } else {
+      request.url;
+    }
+
+    if (/\.m3u8?/.test(request.url)) {
+      contentType = 'application/vnd.apple.mpegurl';
+    } else if (/\.ts/.test(request.url)) {
+      contentType = 'video/MP2T';
+    }
+
+    request.response = new Uint8Array([1]).buffer;
+    request.respond(200,
+                    {'Content-Type': contentType},
+                    window.manifests[manifestName || request.url]);
+  },
 
 
   mockSegmentParser = function(tags) {
   mockSegmentParser = function(tags) {
     if (tags === undefined) {
     if (tags === undefined) {
@@ -87,25 +114,10 @@ module('HLS', {
     oldSetTimeout = window.setTimeout;
     oldSetTimeout = window.setTimeout;
 
 
     // make XHRs synchronous
     // make XHRs synchronous
-    oldXhr = window.XMLHttpRequest;
-    window.XMLHttpRequest = function() {
-      this.open = function(method, url) {
-        xhrUrls.push(url);
-      };
-      this.send = function() {
-        // if the request URL looks like one of the test manifests, grab the
-        // contents off the global object
-        var manifestName = (/(?:.*\/)?(.*)\.m3u8/).exec(xhrUrls.slice(-1)[0]);
-        if (manifestName) {
-          manifestName = manifestName[1];
-        }
-        this.responseText = window.manifests[manifestName || xhrUrls.slice(-1)[0]];
-        this.response = new Uint8Array([1]).buffer;
-
-        this.readyState = 4;
-        this.onreadystatechange();
-      };
-      this.abort = function() {};
+    xhr = sinon.useFakeXMLHttpRequest();
+    requests = [];
+    xhr.onCreate = function(xhr) {
+      requests.push(xhr);
     };
     };
     xhrUrls = [];
     xhrUrls = [];
   },
   },
@@ -115,7 +127,8 @@ module('HLS', {
     videojs.hls.SegmentParser = oldSegmentParser;
     videojs.hls.SegmentParser = oldSegmentParser;
     videojs.SourceBuffer = oldSourceBuffer;
     videojs.SourceBuffer = oldSourceBuffer;
     window.setTimeout = oldSetTimeout;
     window.setTimeout = oldSetTimeout;
-    window.XMLHttpRequest = oldXhr;
+    xhr.restore();
+    //window.XMLHttpRequest = oldXhr;
   }
   }
 });
 });
 
 
@@ -130,6 +143,7 @@ test('starts playing if autoplay is specified', function() {
     type: 'sourceopen'
     type: 'sourceopen'
   });
   });
 
 
+  standardXHRResponse(requests[0]);
   strictEqual(1, plays, 'play was called');
   strictEqual(1, plays, 'play was called');
 });
 });
 
 
@@ -147,6 +161,7 @@ test('loads the specified manifest URL on init', function() {
   videojs.mediaSources[player.currentSrc()].trigger({
   videojs.mediaSources[player.currentSrc()].trigger({
     type: 'sourceopen'
     type: 'sourceopen'
   });
   });
+  standardXHRResponse(requests[0]);
   ok(loadedmanifest, 'loadedmanifest fires');
   ok(loadedmanifest, 'loadedmanifest fires');
   ok(loadedmetadata, 'loadedmetadata fires');
   ok(loadedmetadata, 'loadedmetadata fires');
   ok(player.hls.master, 'a master is inferred');
   ok(player.hls.master, 'a master is inferred');
@@ -171,6 +186,8 @@ test('sets the duration if one is available on the playlist', function() {
     type: 'sourceopen'
     type: 'sourceopen'
   });
   });
 
 
+  standardXHRResponse(requests[0]);
+  standardXHRResponse(requests[1]);
   strictEqual(calls, 2, 'duration is set');
   strictEqual(calls, 2, 'duration is set');
 });
 });
 
 
@@ -187,6 +204,8 @@ test('calculates the duration if needed', function() {
     type: 'sourceopen'
     type: 'sourceopen'
   });
   });
 
 
+  standardXHRResponse(requests[0]);
+  standardXHRResponse(requests[1]);
   strictEqual(durations.length, 2, 'duration is set');
   strictEqual(durations.length, 2, 'duration is set');
   strictEqual(durations[0],
   strictEqual(durations[0],
               player.hls.media.segments.length * 10,
               player.hls.media.segments.length * 10,
@@ -202,7 +221,9 @@ test('starts downloading a segment on loadedmetadata', function() {
     type: 'sourceopen'
     type: 'sourceopen'
   });
   });
 
 
-  strictEqual(xhrUrls[1],
+  standardXHRResponse(requests[0]);
+  standardXHRResponse(requests[1]);
+  strictEqual(requests[1].url,
               window.location.origin +
               window.location.origin +
               window.location.pathname.split('/').slice(0, -1).join('/') +
               window.location.pathname.split('/').slice(0, -1).join('/') +
               '/manifest/00001.ts',
               '/manifest/00001.ts',
@@ -215,7 +236,9 @@ test('recognizes absolute URIs and requests them unmodified', function() {
     type: 'sourceopen'
     type: 'sourceopen'
   });
   });
 
 
-  strictEqual(xhrUrls[1],
+  standardXHRResponse(requests[0]);
+  standardXHRResponse(requests[1]);
+  strictEqual(requests[1].url,
               'http://example.com/00001.ts',
               'http://example.com/00001.ts',
               'the first segment is requested');
               'the first segment is requested');
 });
 });
@@ -226,7 +249,9 @@ test('recognizes domain-relative URLs', function() {
     type: 'sourceopen'
     type: 'sourceopen'
   });
   });
 
 
-  strictEqual(xhrUrls[1],
+  standardXHRResponse(requests[0]);
+  standardXHRResponse(requests[1]);
+  strictEqual(requests[1].url,
               window.location.origin + '/00001.ts',
               window.location.origin + '/00001.ts',
               'the first segment is requested');
               'the first segment is requested');
 });
 });
@@ -272,13 +297,17 @@ test('downloads media playlists after loading the master', function() {
     type: 'sourceopen'
     type: 'sourceopen'
   });
   });
 
 
-  strictEqual(xhrUrls[0], 'manifest/master.m3u8', 'master playlist requested');
-  strictEqual(xhrUrls[1],
+  standardXHRResponse(requests[0]);
+  standardXHRResponse(requests[1]);
+  standardXHRResponse(requests[2]);
+
+  strictEqual(requests[0].url, 'manifest/master.m3u8', 'master playlist requested');
+  strictEqual(requests[1].url,
               window.location.origin +
               window.location.origin +
               window.location.pathname.split('/').slice(0, -1).join('/') +
               window.location.pathname.split('/').slice(0, -1).join('/') +
               '/manifest/media.m3u8',
               '/manifest/media.m3u8',
               'media playlist requested');
               'media playlist requested');
-  strictEqual(xhrUrls[2],
+  strictEqual(requests[2].url,
               window.location.origin +
               window.location.origin +
               window.location.pathname.split('/').slice(0, -1).join('/') +
               window.location.pathname.split('/').slice(0, -1).join('/') +
               '/manifest/00001.ts',
               '/manifest/00001.ts',
@@ -309,6 +338,9 @@ test('calculates the bandwidth after downloading a segment', function() {
     type: 'sourceopen'
     type: 'sourceopen'
   });
   });
 
 
+  standardXHRResponse(requests[0]);
+  standardXHRResponse(requests[1]);
+
   ok(player.hls.bandwidth, 'bandwidth is calculated');
   ok(player.hls.bandwidth, 'bandwidth is calculated');
   ok(player.hls.bandwidth > 0,
   ok(player.hls.bandwidth > 0,
      'bandwidth is positive: ' + player.hls.bandwidth);
      'bandwidth is positive: ' + player.hls.bandwidth);
@@ -327,6 +359,10 @@ test('selects a playlist after segment downloads', function() {
     type: 'sourceopen'
     type: 'sourceopen'
   });
   });
 
 
+  standardXHRResponse(requests[0]);
+  standardXHRResponse(requests[1]);
+  standardXHRResponse(requests[2]);
+
   strictEqual(calls, 1, 'selects after the initial segment');
   strictEqual(calls, 1, 'selects after the initial segment');
   player.currentTime = function() {
   player.currentTime = function() {
     return 1;
     return 1;
@@ -335,34 +371,27 @@ test('selects a playlist after segment downloads', function() {
     return videojs.createTimeRange(0, 2);
     return videojs.createTimeRange(0, 2);
   };
   };
   player.trigger('timeupdate');
   player.trigger('timeupdate');
+
+  standardXHRResponse(requests[3]);
   strictEqual(calls, 2, 'selects after additional segments');
   strictEqual(calls, 2, 'selects after additional segments');
 });
 });
 
 
-asyncTest('moves to the next segment if there is a network error', function() {
+test('moves to the next segment if there is a network error', function() {
   var mediaIndex;
   var mediaIndex;
 
 
-  player.on('loadedmanifest', function() {
-    // fail the next segment request
-    window.XMLHttpRequest = function() {
-      this.open = function() {};
-      this.send = function() {
-        this.readyState = 4;
-        this.status = 400;
-        this.onreadystatechange();
-
-        strictEqual(mediaIndex + 1, player.hls.mediaIndex, 'media index is incremented');
-        start();
-      };
-    };
-
-    mediaIndex = player.hls.mediaIndex;
-    player.trigger('timeupdate');
-  });
-
   player.hls('manifest/master.m3u8');
   player.hls('manifest/master.m3u8');
   videojs.mediaSources[player.currentSrc()].trigger({
   videojs.mediaSources[player.currentSrc()].trigger({
     type: 'sourceopen'
     type: 'sourceopen'
   });
   });
+
+  standardXHRResponse(requests[0]);
+  standardXHRResponse(requests[1]);
+
+  mediaIndex = player.hls.mediaIndex;
+  player.trigger('timeupdate');
+
+  requests[2].respond(400);
+  strictEqual(mediaIndex + 1, player.hls.mediaIndex, 'media index is incremented');
 });
 });
 
 
 test('updates the duration after switching playlists', function() {
 test('updates the duration after switching playlists', function() {
@@ -387,6 +416,10 @@ test('updates the duration after switching playlists', function() {
     type: 'sourceopen'
     type: 'sourceopen'
   });
   });
 
 
+  standardXHRResponse(requests[0]);
+  standardXHRResponse(requests[1]);
+  standardXHRResponse(requests[2]);
+  standardXHRResponse(requests[3]);
   ok(selectedPlaylist, 'selected playlist');
   ok(selectedPlaylist, 'selected playlist');
   strictEqual(calls, 1, 'updates the duration');
   strictEqual(calls, 1, 'updates the duration');
 });
 });
@@ -402,6 +435,8 @@ test('downloads additional playlists if required', function() {
     type: 'sourceopen'
     type: 'sourceopen'
   });
   });
 
 
+  standardXHRResponse(requests[0]);
+  standardXHRResponse(requests[1]);
   // before an m3u8 is downloaded, no segments are available
   // before an m3u8 is downloaded, no segments are available
   player.hls.selectPlaylist = function() {
   player.hls.selectPlaylist = function() {
     if (!called) {
     if (!called) {
@@ -411,13 +446,15 @@ test('downloads additional playlists if required', function() {
     playlist.segments = [1, 1, 1];
     playlist.segments = [1, 1, 1];
     return playlist;
     return playlist;
   };
   };
-  xhrUrls = [];
 
 
   // the playlist selection is revisited after a new segment is downloaded
   // the playlist selection is revisited after a new segment is downloaded
   player.trigger('timeupdate');
   player.trigger('timeupdate');
 
 
-  strictEqual(2, xhrUrls.length, 'requests were made');
-  strictEqual(xhrUrls[1],
+  standardXHRResponse(requests[2]);
+  standardXHRResponse(requests[3]);
+
+  strictEqual(4, requests.length, 'requests were made');
+  strictEqual(requests[3].url,
               window.location.origin +
               window.location.origin +
               window.location.pathname.split('/').slice(0, -1).join('/') +
               window.location.pathname.split('/').slice(0, -1).join('/') +
               '/manifest/' +
               '/manifest/' +
@@ -434,6 +471,8 @@ test('selects a playlist below the current bandwidth', function() {
     type: 'sourceopen'
     type: 'sourceopen'
   });
   });
 
 
+  standardXHRResponse(requests[0]);
+
   // the default playlist has a really high bitrate
   // the default playlist has a really high bitrate
   player.hls.master.playlists[0].attributes.BANDWIDTH = 9e10;
   player.hls.master.playlists[0].attributes.BANDWIDTH = 9e10;
   // playlist 1 has a very low bitrate
   // playlist 1 has a very low bitrate
@@ -454,6 +493,8 @@ test('raises the minimum bitrate for a stream proportionially', function() {
     type: 'sourceopen'
     type: 'sourceopen'
   });
   });
 
 
+  standardXHRResponse(requests[0]);
+
   // the default playlist's bandwidth + 10% is equal to the current bandwidth
   // the default playlist's bandwidth + 10% is equal to the current bandwidth
   player.hls.master.playlists[0].attributes.BANDWIDTH = 10;
   player.hls.master.playlists[0].attributes.BANDWIDTH = 10;
   player.hls.bandwidth = 11;
   player.hls.bandwidth = 11;
@@ -474,6 +515,8 @@ test('uses the lowest bitrate if no other is suitable', function() {
     type: 'sourceopen'
     type: 'sourceopen'
   });
   });
 
 
+  standardXHRResponse(requests[0]);
+
   // the lowest bitrate playlist is much greater than 1b/s
   // the lowest bitrate playlist is much greater than 1b/s
   player.hls.bandwidth = 1;
   player.hls.bandwidth = 1;
   playlist = player.hls.selectPlaylist();
   playlist = player.hls.selectPlaylist();
@@ -493,6 +536,8 @@ test('selects the correct rendition by player dimensions', function() {
     type: 'sourceopen'
     type: 'sourceopen'
   });
   });
 
 
+  standardXHRResponse(requests[0]);
+
   player.width(640);
   player.width(640);
   player.height(360);
   player.height(360);
   player.hls.bandwidth = 3000000;
   player.hls.bandwidth = 3000000;
@@ -525,9 +570,12 @@ test('does not download the next segment if the buffer is full', function() {
   videojs.mediaSources[player.currentSrc()].trigger({
   videojs.mediaSources[player.currentSrc()].trigger({
     type: 'sourceopen'
     type: 'sourceopen'
   });
   });
+
+  standardXHRResponse(requests[0]);
+
   player.trigger('timeupdate');
   player.trigger('timeupdate');
 
 
-  strictEqual(xhrUrls.length, 1, 'no segment request was made');
+  strictEqual(requests.length, 1, 'no segment request was made');
 });
 });
 
 
 test('downloads the next segment if the buffer is getting low', function() {
 test('downloads the next segment if the buffer is getting low', function() {
@@ -535,7 +583,11 @@ test('downloads the next segment if the buffer is getting low', function() {
   videojs.mediaSources[player.currentSrc()].trigger({
   videojs.mediaSources[player.currentSrc()].trigger({
     type: 'sourceopen'
     type: 'sourceopen'
   });
   });
-  strictEqual(xhrUrls.length, 2, 'did not make a request');
+
+  standardXHRResponse(requests[0]);
+  standardXHRResponse(requests[1]);
+
+  strictEqual(requests.length, 2, 'did not make a request');
   player.currentTime = function() {
   player.currentTime = function() {
     return 15;
     return 15;
   };
   };
@@ -544,8 +596,10 @@ test('downloads the next segment if the buffer is getting low', function() {
   };
   };
   player.trigger('timeupdate');
   player.trigger('timeupdate');
 
 
-  strictEqual(xhrUrls.length, 3, 'made a request');
-  strictEqual(xhrUrls[2],
+  standardXHRResponse(requests[2]);
+
+  strictEqual(requests.length, 3, 'made a request');
+  strictEqual(requests[2].url,
               window.location.origin +
               window.location.origin +
               window.location.pathname.split('/').slice(0, -1).join('/') +
               window.location.pathname.split('/').slice(0, -1).join('/') +
               '/manifest/00002.ts',
               '/manifest/00002.ts',
@@ -557,7 +611,8 @@ test('stops downloading segments at the end of the playlist', function() {
   videojs.mediaSources[player.currentSrc()].trigger({
   videojs.mediaSources[player.currentSrc()].trigger({
     type: 'sourceopen'
     type: 'sourceopen'
   });
   });
-  xhrUrls = [];
+  standardXHRResponse(requests[0]);
+  requests = [];
   player.hls.mediaIndex = 4;
   player.hls.mediaIndex = 4;
   player.trigger('timeupdate');
   player.trigger('timeupdate');
 
 
@@ -570,6 +625,8 @@ test('only makes one segment request at a time', function() {
   videojs.mediaSources[player.currentSrc()].trigger({
   videojs.mediaSources[player.currentSrc()].trigger({
     type: 'sourceopen'
     type: 'sourceopen'
   });
   });
+  xhr.restore();
+  var oldXHR = window.XMLHttpRequest;
   // mock out a long-running XHR
   // mock out a long-running XHR
   window.XMLHttpRequest = function() {
   window.XMLHttpRequest = function() {
     this.send = function() {};
     this.send = function() {};
@@ -577,11 +634,14 @@ test('only makes one segment request at a time', function() {
       openedXhrs++;
       openedXhrs++;
     };
     };
   };
   };
+  standardXHRResponse(requests[0]);
   player.trigger('timeupdate');
   player.trigger('timeupdate');
 
 
   strictEqual(1, openedXhrs, 'one XHR is made');
   strictEqual(1, openedXhrs, 'one XHR is made');
   player.trigger('timeupdate');
   player.trigger('timeupdate');
   strictEqual(1, openedXhrs, 'only one XHR is made');
   strictEqual(1, openedXhrs, 'only one XHR is made');
+  window.XMLHttpRequest = oldXHR;
+  xhr = sinon.useFakeXMLHttpRequest();
 });
 });
 
 
 test('uses the src attribute if no options are provided and it ends in ".m3u8"', function() {
 test('uses the src attribute if no options are provided and it ends in ".m3u8"', function() {
@@ -592,7 +652,7 @@ test('uses the src attribute if no options are provided and it ends in ".m3u8"',
     type: 'sourceopen'
     type: 'sourceopen'
   });
   });
 
 
-  strictEqual(url, xhrUrls[0], 'currentSrc is used');
+  strictEqual(requests[0].url, url, 'currentSrc is used');
 });
 });
 
 
 test('ignores src attribute if it doesn\'t have the "m3u8" extension', function() {
 test('ignores src attribute if it doesn\'t have the "m3u8" extension', function() {
@@ -600,27 +660,27 @@ test('ignores src attribute if it doesn\'t have the "m3u8" extension', function(
   tech.src = 'basdfasdfasdfliel//.m3u9';
   tech.src = 'basdfasdfasdfliel//.m3u9';
   player.hls();
   player.hls();
   ok(!(player.currentSrc() in videojs.mediaSources), 'no media source is created');
   ok(!(player.currentSrc() in videojs.mediaSources), 'no media source is created');
-  strictEqual(xhrUrls.length, 0, 'no request is made');
+  strictEqual(requests.length, 0, 'no request is made');
 
 
   tech.src = '';
   tech.src = '';
   player.hls();
   player.hls();
   ok(!(player.currentSrc() in videojs.mediaSources), 'no media source is created');
   ok(!(player.currentSrc() in videojs.mediaSources), 'no media source is created');
-  strictEqual(xhrUrls.length, 0, 'no request is made');
+  strictEqual(requests.length, 0, 'no request is made');
 
 
   tech.src = 'http://example.com/movie.mp4?q=why.m3u8';
   tech.src = 'http://example.com/movie.mp4?q=why.m3u8';
   player.hls();
   player.hls();
   ok(!(player.currentSrc() in videojs.mediaSources), 'no media source is created');
   ok(!(player.currentSrc() in videojs.mediaSources), 'no media source is created');
-  strictEqual(xhrUrls.length, 0, 'no request is made');
+  strictEqual(requests.length, 0, 'no request is made');
 
 
   tech.src = 'http://example.m3u8/movie.mp4';
   tech.src = 'http://example.m3u8/movie.mp4';
   player.hls();
   player.hls();
   ok(!(player.currentSrc() in videojs.mediaSources), 'no media source is created');
   ok(!(player.currentSrc() in videojs.mediaSources), 'no media source is created');
-  strictEqual(xhrUrls.length, 0, 'no request is made');
+  strictEqual(requests.length, 0, 'no request is made');
 
 
   tech.src = '//example.com/movie.mp4#http://tricky.com/master.m3u8';
   tech.src = '//example.com/movie.mp4#http://tricky.com/master.m3u8';
   player.hls();
   player.hls();
   ok(!(player.currentSrc() in videojs.mediaSources), 'no media source is created');
   ok(!(player.currentSrc() in videojs.mediaSources), 'no media source is created');
-  strictEqual(xhrUrls.length, 0, 'no request is made');
+  strictEqual(requests.length, 0, 'no request is made');
 });
 });
 
 
 test('activates if the first playable source is HLS', function() {
 test('activates if the first playable source is HLS', function() {
@@ -651,6 +711,7 @@ test('cancels outstanding XHRs when seeking', function() {
   videojs.mediaSources[player.currentSrc()].trigger({
   videojs.mediaSources[player.currentSrc()].trigger({
     type: 'sourceopen'
     type: 'sourceopen'
   });
   });
+  standardXHRResponse(requests[0]);
   player.hls.media = {
   player.hls.media = {
     segments: [{
     segments: [{
       uri: '0.ts',
       uri: '0.ts',
@@ -661,27 +722,14 @@ test('cancels outstanding XHRs when seeking', function() {
     }]
     }]
   };
   };
 
 
-  // XHR requests will never complete
-  window.XMLHttpRequest = function() {
-    this.open = function() {
-      opened++;
-    };
-    this.send = function() {};
-    this.abort = function() {
-      aborted = true;
-      this.readyState = 4;
-      this.status = 0;
-      this.onreadystatechange();
-    };
-  };
   // trigger a segment download request
   // trigger a segment download request
   player.trigger('timeupdate');
   player.trigger('timeupdate');
   opened = 0;
   opened = 0;
   // attempt to seek while the download is in progress
   // attempt to seek while the download is in progress
   player.trigger('seeking');
   player.trigger('seeking');
 
 
-  ok(aborted, 'XHR aborted');
-  strictEqual(1, opened, 'opened new XHR');
+  ok(requests[1].aborted, 'XHR aborted');
+  strictEqual(requests.length, 3, 'opened new XHR');
 });
 });
 
 
 test('flushes the parser after each segment', function() {
 test('flushes the parser after each segment', function() {
@@ -703,7 +751,9 @@ test('flushes the parser after each segment', function() {
     type: 'sourceopen'
     type: 'sourceopen'
   });
   });
 
 
-  strictEqual(1, flushes, 'tags are flushed at the end of a segment');
+  standardXHRResponse(requests[0]);
+  standardXHRResponse(requests[1]);
+  strictEqual(flushes, 1, 'tags are flushed at the end of a segment');
 });
 });
 
 
 test('drops tags before the target timestamp when seeking', function() {
 test('drops tags before the target timestamp when seeking', function() {
@@ -711,7 +761,8 @@ test('drops tags before the target timestamp when seeking', function() {
     i = 10,
     i = 10,
     callbacks = [],
     callbacks = [],
     tags = [],
     tags = [],
-    bytes = [];
+    bytes = [],
+    oldSetTimeout = window.setTimeout;
 
 
   // mock out the parser and source buffer
   // mock out the parser and source buffer
   videojs.hls.SegmentParser = mockSegmentParser(tags);
   videojs.hls.SegmentParser = mockSegmentParser(tags);
@@ -732,6 +783,8 @@ test('drops tags before the target timestamp when seeking', function() {
   videojs.mediaSources[player.currentSrc()].trigger({
   videojs.mediaSources[player.currentSrc()].trigger({
     type: 'sourceopen'
     type: 'sourceopen'
   });
   });
+  standardXHRResponse(requests[0]);
+  standardXHRResponse(requests[1]);
   while (callbacks.length) {
   while (callbacks.length) {
     callbacks.shift()();
     callbacks.shift()();
   }
   }
@@ -748,19 +801,23 @@ test('drops tags before the target timestamp when seeking', function() {
     return 7;
     return 7;
   };
   };
   player.trigger('seeking');
   player.trigger('seeking');
+  standardXHRResponse(requests[2]);
 
 
   while (callbacks.length) {
   while (callbacks.length) {
     callbacks.shift()();
     callbacks.shift()();
   }
   }
 
 
   deepEqual(bytes, [7,8,9], 'three tags are appended');
   deepEqual(bytes, [7,8,9], 'three tags are appended');
+  window.setTimeout = oldSetTimeout;
 });
 });
 
 
 test('clears pending buffer updates when seeking', function() {
 test('clears pending buffer updates when seeking', function() {
   var
   var
     bytes = [],
     bytes = [],
     callbacks = [],
     callbacks = [],
-    tags = [{ pts: 0, bytes: 0 }];
+    tags = [{ pts: 0, bytes: 0 }],
+    oldSetTimeout = window.setTimeout;
+
   // mock out the parser and source buffer
   // mock out the parser and source buffer
   videojs.hls.SegmentParser = mockSegmentParser(tags);
   videojs.hls.SegmentParser = mockSegmentParser(tags);
   window.videojs.SourceBuffer = function() {
   window.videojs.SourceBuffer = function() {
@@ -779,18 +836,23 @@ test('clears pending buffer updates when seeking', function() {
     type: 'sourceopen'
     type: 'sourceopen'
   });
   });
 
 
+  standardXHRResponse(requests[0]);
+  standardXHRResponse(requests[1]);
+
   // seek to 7s
   // seek to 7s
   tags.push({ pts: 7000, bytes: 7 });
   tags.push({ pts: 7000, bytes: 7 });
   player.currentTime = function() {
   player.currentTime = function() {
     return 7;
     return 7;
   };
   };
   player.trigger('seeking');
   player.trigger('seeking');
+  standardXHRResponse(requests[2]);
 
 
   while (callbacks.length) {
   while (callbacks.length) {
     callbacks.shift()();
     callbacks.shift()();
   }
   }
 
 
   deepEqual(bytes, ['flv', 7], 'tags queued to be appended should be cancelled');
   deepEqual(bytes, ['flv', 7], 'tags queued to be appended should be cancelled');
+  window.setTimeout = oldSetTimeout;
 });
 });
 
 
 test('playlist 404 should trigger MEDIA_ERR_NETWORK', function() {
 test('playlist 404 should trigger MEDIA_ERR_NETWORK', function() {
@@ -825,23 +887,12 @@ test('playlist 404 should trigger MEDIA_ERR_NETWORK', function() {
 test('segment 404 should trigger MEDIA_ERR_NETWORK', function () {
 test('segment 404 should trigger MEDIA_ERR_NETWORK', function () {
   player.hls('manifest/media.m3u8');
   player.hls('manifest/media.m3u8');
 
 
-  player.on('loadedmanifest', function () {
-    window.XMLHttpRequest = function () {
-      this.open = function (method, url) {
-        xhrUrls.push(url);
-      };
-      this.send = function () {
-        this.readyState = 4;
-        this.status = 404;
-        this.onreadystatechange();
-      };
-    };
-  });
-
   videojs.mediaSources[player.currentSrc()].trigger({
   videojs.mediaSources[player.currentSrc()].trigger({
     type: 'sourceopen'
     type: 'sourceopen'
   });
   });
 
 
+  standardXHRResponse(requests[0]);
+  requests[1].respond(404);
   ok(player.hls.error.message, 'an error message is available');
   ok(player.hls.error.message, 'an error message is available');
   equal(2, player.hls.error.code, 'Player error code should be set to MediaError.MEDIA_ERR_NETWORK');
   equal(2, player.hls.error.code, 'Player error code should be set to MediaError.MEDIA_ERR_NETWORK');
 });
 });
@@ -849,23 +900,12 @@ test('segment 404 should trigger MEDIA_ERR_NETWORK', function () {
 test('segment 500 should trigger MEDIA_ERR_ABORTED', function () {
 test('segment 500 should trigger MEDIA_ERR_ABORTED', function () {
   player.hls('manifest/media.m3u8');
   player.hls('manifest/media.m3u8');
 
 
-  player.on('loadedmanifest', function () {
-    window.XMLHttpRequest = function () {
-      this.open = function (method, url) {
-        xhrUrls.push(url);
-      };
-      this.send = function () {
-        this.readyState = 4;
-        this.status = 500;
-        this.onreadystatechange();
-      };
-    };
-  });
-
   videojs.mediaSources[player.currentSrc()].trigger({
   videojs.mediaSources[player.currentSrc()].trigger({
     type: 'sourceopen'
     type: 'sourceopen'
   });
   });
 
 
+  standardXHRResponse(requests[0]);
+  requests[1].respond(500);
   ok(player.hls.error.message, 'an error message is available');
   ok(player.hls.error.message, 'an error message is available');
   equal(4, player.hls.error.code, 'Player error code should be set to MediaError.MEDIA_ERR_ABORTED');
   equal(4, player.hls.error.code, 'Player error code should be set to MediaError.MEDIA_ERR_ABORTED');
 });
 });
@@ -879,7 +919,8 @@ test('has no effect if native HLS is available', function() {
 });
 });
 
 
 test('reloads live playlists', function() {
 test('reloads live playlists', function() {
-  var callbacks = [];
+  var callbacks = [],
+      oldSetTimeout = window.setTimeout;
   // capture timeouts
   // capture timeouts
   window.setTimeout = function(callback, timeout) {
   window.setTimeout = function(callback, timeout) {
     callbacks.push({ callback: callback, timeout: timeout });
     callbacks.push({ callback: callback, timeout: timeout });
@@ -888,11 +929,13 @@ test('reloads live playlists', function() {
   videojs.mediaSources[player.currentSrc()].trigger({
   videojs.mediaSources[player.currentSrc()].trigger({
     type: 'sourceopen'
     type: 'sourceopen'
   });
   });
+  standardXHRResponse(requests[0]);
 
 
   strictEqual(1, callbacks.length, 'refresh was scheduled');
   strictEqual(1, callbacks.length, 'refresh was scheduled');
   strictEqual(player.hls.media.targetDuration * 1000,
   strictEqual(player.hls.media.targetDuration * 1000,
               callbacks[0].timeout,
               callbacks[0].timeout,
               'waited one target duration');
               'waited one target duration');
+  window.setTimeout = oldSetTimeout;
 });
 });
 
 
 test('duration is Infinity for live playlists', function() {
 test('duration is Infinity for live playlists', function() {
@@ -901,7 +944,9 @@ test('duration is Infinity for live playlists', function() {
     type: 'sourceopen'
     type: 'sourceopen'
   });
   });
 
 
-  strictEqual(Infinity, player.duration(), 'duration is infinity');
+  standardXHRResponse(requests[0]);
+
+  strictEqual(player.duration(), Infinity, 'duration is infinity');
 });
 });
 
 
 test('does not reload playlists with an endlist tag', function() {
 test('does not reload playlists with an endlist tag', function() {
@@ -920,7 +965,8 @@ test('does not reload playlists with an endlist tag', function() {
 
 
 test('reloads a live playlist after half a target duration if it has not ' +
 test('reloads a live playlist after half a target duration if it has not ' +
      'changed since the last request', function() {
      'changed since the last request', function() {
-  var callbacks = [];
+  var callbacks = [],
+      oldSetTimeout = window.setTimeout;
   // capture timeouts
   // capture timeouts
   window.setTimeout = function(callback, timeout) {
   window.setTimeout = function(callback, timeout) {
     callbacks.push({ callback: callback, timeout: timeout });
     callbacks.push({ callback: callback, timeout: timeout });
@@ -930,19 +976,25 @@ test('reloads a live playlist after half a target duration if it has not ' +
     type: 'sourceopen'
     type: 'sourceopen'
   });
   });
 
 
+  standardXHRResponse(requests[0]);
+  standardXHRResponse(requests[1]);
   strictEqual(callbacks.length, 1, 'full-length refresh scheduled');
   strictEqual(callbacks.length, 1, 'full-length refresh scheduled');
   callbacks.pop().callback();
   callbacks.pop().callback();
+  standardXHRResponse(requests[2]);
 
 
-  strictEqual(1, callbacks.length, 'half-length refresh was scheduled');
+  strictEqual(callbacks.length, 1, 'half-length refresh was scheduled');
   strictEqual(callbacks[0].timeout,
   strictEqual(callbacks[0].timeout,
               player.hls.media.targetDuration / 2 * 1000,
               player.hls.media.targetDuration / 2 * 1000,
               'waited half a target duration');
               'waited half a target duration');
+  window.setTimeout = oldSetTimeout;
 });
 });
 
 
 test('merges playlist reloads', function() {
 test('merges playlist reloads', function() {
   var
   var
     oldPlaylist,
     oldPlaylist,
-    callback;
+    callback,
+    oldSetTimeout = window.setTimeout;
+
   // capture timeouts
   // capture timeouts
   window.setTimeout = function(cb) {
   window.setTimeout = function(cb) {
     callback = cb;
     callback = cb;
@@ -952,14 +1004,19 @@ test('merges playlist reloads', function() {
   videojs.mediaSources[player.currentSrc()].trigger({
   videojs.mediaSources[player.currentSrc()].trigger({
     type: 'sourceopen'
     type: 'sourceopen'
   });
   });
+  standardXHRResponse(requests[0]);
+  standardXHRResponse(requests[1]);
   oldPlaylist = player.hls.media;
   oldPlaylist = player.hls.media;
 
 
   callback();
   callback();
+  standardXHRResponse(requests[2]);
   ok(oldPlaylist !== player.hls.media, 'player.hls.media was updated');
   ok(oldPlaylist !== player.hls.media, 'player.hls.media was updated');
+  window.setTimeout = oldSetTimeout;
 });
 });
 
 
 test('updates the media index when a playlist reloads', function() {
 test('updates the media index when a playlist reloads', function() {
-  var callback;
+  var callback,
+      oldSetTimeout = window.setTimeout;
   window.setTimeout = function(cb) {
   window.setTimeout = function(cb) {
     callback = cb;
     callback = cb;
   };
   };
@@ -978,6 +1035,8 @@ test('updates the media index when a playlist reloads', function() {
     type: 'sourceopen'
     type: 'sourceopen'
   });
   });
 
 
+  standardXHRResponse(requests[0]);
+  standardXHRResponse(requests[1]);
   // play the stream until 2.ts is playing
   // play the stream until 2.ts is playing
   player.hls.mediaIndex = 3;
   player.hls.mediaIndex = 3;
 
 
@@ -991,8 +1050,10 @@ test('updates the media index when a playlist reloads', function() {
     '#EXTINF:10,\n' +
     '#EXTINF:10,\n' +
     '3.ts\n';
     '3.ts\n';
   callback();
   callback();
+  standardXHRResponse(requests[2]);
 
 
   strictEqual(player.hls.mediaIndex, 2, 'mediaIndex is updated after the reload');
   strictEqual(player.hls.mediaIndex, 2, 'mediaIndex is updated after the reload');
+  window.setTimeout = oldSetTimeout;
 });
 });
 
 
 test('mediaIndex is zero before the first segment loads', function() {
 test('mediaIndex is zero before the first segment loads', function() {
@@ -1063,7 +1124,22 @@ test('does not reload master playlists', function() {
 });
 });
 
 
 test('only reloads the active media playlist', function() {
 test('only reloads the active media playlist', function() {
-  var callbacks = [], urls = [], responses = [];
+  var callbacks = [],
+      i = 0,
+      filteredRequests = [],
+      oldSetTimeout = window.setTimeout,
+      customResponse;
+
+  customResponse = function(request) {
+    request.response = new Uint8Array([1]).buffer;
+    request.respond(200,
+                    {'Content-Type': 'application/vnd.apple.mpegurl'},
+                    '#EXTM3U\n' +
+                    '#EXT-X-MEDIA-SEQUENCE:1\n' +
+                    '#EXTINF:10,\n' +
+                    '1.ts\n');
+  };
+
   window.setTimeout = function(callback) {
   window.setTimeout = function(callback) {
     callbacks.push(callback);
     callbacks.push(callback);
   };
   };
@@ -1072,24 +1148,9 @@ test('only reloads the active media playlist', function() {
   videojs.mediaSources[player.currentSrc()].trigger({
   videojs.mediaSources[player.currentSrc()].trigger({
     type: 'sourceopen'
     type: 'sourceopen'
   });
   });
+  standardXHRResponse(requests[0]);
+  standardXHRResponse(requests[1]);
 
 
-  window.XMLHttpRequest = function() {
-    this.open = function(method, url) {
-      urls.push(url);
-    };
-    this.send = function() {
-      var xhr = this;
-      responses.push(function() {
-        xhr.readyState = 4;
-        xhr.responseText = '#EXTM3U\n' +
-          '#EXT-X-MEDIA-SEQUENCE:1\n' +
-          '#EXTINF:10,\n' +
-          '1.ts\n';
-        xhr.response = new Uint8Array([1]).buffer;
-        xhr.onreadystatechange();
-      });
-    };
-  };
   player.hls.selectPlaylist = function() {
   player.hls.selectPlaylist = function() {
     return player.hls.master.playlists[1];
     return player.hls.master.playlists[1];
   };
   };
@@ -1099,19 +1160,24 @@ test('only reloads the active media playlist', function() {
 
 
   player.trigger('timeupdate');
   player.trigger('timeupdate');
   strictEqual(callbacks.length, 1, 'a refresh is scheduled');
   strictEqual(callbacks.length, 1, 'a refresh is scheduled');
-  strictEqual(responses.length, 1, 'segment requested');
 
 
-  responses.shift()(); // segment response
-  responses.shift()(); // loaded switched.m3u8
+  standardXHRResponse(requests[2]); // segment response
+  customResponse(requests[3]); // loaded witched.m3u8
 
 
-  urls = [];
   callbacks.shift()(); // out-of-date refresh of missingEndlist.m3u8
   callbacks.shift()(); // out-of-date refresh of missingEndlist.m3u8
   callbacks.shift()(); // refresh switched.m3u8
   callbacks.shift()(); // refresh switched.m3u8
 
 
-  strictEqual(urls.length, 1, 'one refresh was made');
-  strictEqual(urls[0],
+  for (; i < requests.length; i++) {
+    if (/switched/.test(requests[i].url)) {
+      filteredRequests.push(requests[i]);
+    }
+  }
+  strictEqual(filteredRequests.length, 2, 'one refresh was made');
+  strictEqual(filteredRequests[1].url,
               'http://example.com/switched.m3u8',
               'http://example.com/switched.m3u8',
               'refreshed the active playlist');
               'refreshed the active playlist');
+
+  window.setTimeout = oldSetTimeout;
 });
 });
 
 
 })(window, window.videojs);
 })(window, window.videojs);