Quelle  testharness.js   Sprache: JAVA

/*global self*/
/*jshint latedef: nofunc*/
/*
Distributed under both the W3C Test Suite License [1] and the W3C
3-clause BSD License [2]. To contribute to a W3C Test Suite, see the
policies and contribution forms [3].

[1] http://www.w3.org/Consortium/Legal/2008/04-testsuite-license
[2] http://www.w3.org/Consortium/Legal/2008/03-bsd-license
[3] http://www.w3.org/2004/10/27-testcases
*/

/* Documentation is in docs/api.md */

(function ()
{
    var debug = false;
    // default timeout is 10 seconds, test can override if needed
    var settings = {
        output:true,
        harness_timeout:{
            "normal":10000,
            "long":60000
        },
        test_timeout:null,
        message_events: ["start", "test_state", "result", "completion"]
    };

    var xhtml_ns = "http://www.w3.org/1999/xhtml";

    /*
     * TestEnvironment is an abstraction for the environment in which the test
     * harness is used. Each implementation of a test environment has to provide
     * the following interface:
     *
     * interface TestEnvironment {
     *   // Invoked after the global 'tests' object has been created and it's
     *   // safe to call add_*_callback() to register event handlers.
     *   void on_tests_ready();
     *
     *   // Invoked after setup() has been called to notify the test environment
     *   // of changes to the test harness properties.
     *   void on_new_harness_properties(object properties);
     *
     *   // Should return a new unique default test name.
     *   DOMString next_default_test_name();
     *
     *   // Should return the test harness timeout duration in milliseconds.
     *   float test_timeout();
     *
     *   // Should return the global scope object.
     *   object global_scope();
     * };
     */

    /*
     * A test environment with a DOM. The global object is 'window'. By default
     * test results are displayed in a table. Any parent windows receive
     * callbacks or messages via postMessage() when test events occur. See
     * apisample11.html and apisample12.html.
     */
    function WindowTestEnvironment() {
        this.name_counter = 0;
        this.window_cache = null;
        this.output_handler = null;
        this.all_loaded = false;
        var this_obj = this;
        this.message_events = [];

        this.message_functions = {
            start: [add_start_callback, remove_start_callback,
                    function (properties) {
                        this_obj._dispatch("start_callback", [properties],
                                           {type: "start", properties: properties});
                    }],

            test_state: [add_test_state_callback, remove_test_state_callback,
                         function(test) {
                             this_obj._dispatch("test_state_callback", [test],
                                                {type: "test_state",
                                                 test: test.structured_clone()});
                         }],
            result: [add_result_callback, remove_result_callback,
                     function (test) {
                         this_obj.output_handler.show_status();
                         this_obj._dispatch("result_callback", [test],
                                            {type: "result",
                                             test: test.structured_clone()});
                     }],
            completion: [add_completion_callback, remove_completion_callback,
                         function (tests, harness_status) {
                             var cloned_tests = map(tests, function(test) {
                                 return test.structured_clone();
                             });
                             this_obj._dispatch("completion_callback", [tests, harness_status],
                                                {type: "complete",
                                                 tests: cloned_tests,
                                                 status: harness_status.structured_clone()});
                         }]
        }

        on_event(window, 'load', function() {
            this_obj.all_loaded = true;
        });
    }

    WindowTestEnvironment.prototype._dispatch = function(selector, callback_args, message_arg) {
        this._forEach_windows(
                function(w, same_origin) {
                    if (same_origin) {
                        try {
                            var has_selector = selector in w;
                        } catch(e) {
                            // If document.domain was set at some point same_origin can be
                            // wrong and the above will fail.
                            has_selector = false;
                        }
                        if (has_selector) {
                            try {
                                w[selector].apply(undefined, callback_args);
                            } catch (e) {
                                if (debug) {
                                    throw e;
                                }
                            }
                        }
                    }
                    if (supports_post_message(w) && w !== self) {
                        w.postMessage(message_arg, "*");
                    }
                });
    };

    WindowTestEnvironment.prototype._forEach_windows = function(callback) {
        // Iterate of the the windows [self ... top, opener]. The callback is passed
        // two objects, the first one is the windows object itself, the second one
        // is a boolean indicating whether or not its on the same origin as the
        // current window.
        var cache = this.window_cache;
        if (!cache) {
            cache = [[self, true]];
            var w = self;
            var i = 0;
            var so;
            var origins = location.ancestorOrigins;
            while (w != w.parent) {
                w = w.parent;
                // In WebKit, calls to parent windows' properties that aren't on the same
                // origin cause an error message to be displayed in the error console but
                // don't throw an exception. This is a deviation from the current HTML5
                // spec. See: https://bugs.webkit.org/show_bug.cgi?id=43504
                // The problem with WebKit's behavior is that it pollutes the error console
                // with error messages that can't be caught.
                //
                // This issue can be mitigated by relying on the (for now) proprietary
                // `location.ancestorOrigins` property which returns an ordered list of
                // the origins of enclosing windows. See:
                // http://trac.webkit.org/changeset/113945.
                if (origins) {
                    so = (location.origin == origins[i]);
                } else {
                    so = is_same_origin(w);
                }
                cache.push([w, so]);
                i++;
            }
            w = window.opener;
            if (w) {
                // window.opener isn't included in the `location.ancestorOrigins` prop.
                // We'll just have to deal with a simple check and an error msg on WebKit
                // browsers in this case.
                cache.push([w, is_same_origin(w)]);
            }
            this.window_cache = cache;
        }

        forEach(cache,
                function(a) {
                    callback.apply(null, a);
                });
    };

    WindowTestEnvironment.prototype.on_tests_ready = function() {
        var output = new Output();
        this.output_handler = output;

        var this_obj = this;

        add_start_callback(function (properties) {
            this_obj.output_handler.init(properties);
        });

        add_test_state_callback(function(test) {
            this_obj.output_handler.show_status();
        });

        add_result_callback(function (test) {
            this_obj.output_handler.show_status();
        });

        add_completion_callback(function (tests, harness_status) {
            this_obj.output_handler.show_results(tests, harness_status);
        });
        this.setup_messages(settings.message_events);
    };

    WindowTestEnvironment.prototype.setup_messages = function(new_events) {
        var this_obj = this;
        forEach(settings.message_events, function(x) {
            var current_dispatch = this_obj.message_events.includes(x);
            var new_dispatch = new_events.includes(x);
            if (!current_dispatch && new_dispatch) {
                this_obj.message_functions[x][0](this_obj.message_functions[x][2]);
            } else if (current_dispatch && !new_dispatch) {
                this_obj.message_functions[x][1](this_obj.message_functions[x][2]);
            }
        });
        this.message_events = new_events;
    }

    WindowTestEnvironment.prototype.next_default_test_name = function() {
        //Don't use document.title to work around an Opera bug in XHTML documents
        var title = document.getElementsByTagName("title")[0];
        var prefix = (title && title.firstChild && title.firstChild.data) || "Untitled";
        var suffix = this.name_counter > 0 ? " " + this.name_counter : "";
        this.name_counter++;
        return prefix + suffix;
    };

    WindowTestEnvironment.prototype.on_new_harness_properties = function(properties) {
        this.output_handler.setup(properties);
        if (properties.hasOwnProperty("message_events")) {
            this.setup_messages(properties.message_events);
        }
    };

    WindowTestEnvironment.prototype.add_on_loaded_callback = function(callback) {
        on_event(window, 'load', callback);
    };

    WindowTestEnvironment.prototype.test_timeout = function() {
        var metas = document.getElementsByTagName("meta");
        for (var i = 0; i < metas.length; i++) {
            if (metas[i].name == "timeout") {
                if (metas[i].content == "long") {
                    return settings.harness_timeout.long;
                }
                break;
            }
        }
        return settings.harness_timeout.normal;
    };

    WindowTestEnvironment.prototype.global_scope = function() {
        return window;
    };

    /*
     * Base TestEnvironment implementation for a generic web worker.
     *
     * Workers accumulate test results. One or more clients can connect and
     * retrieve results from a worker at any time.
     *
     * WorkerTestEnvironment supports communicating with a client via a
     * MessagePort.  The mechanism for determining the appropriate MessagePort
     * for communicating with a client depends on the type of worker and is
     * implemented by the various specializations of WorkerTestEnvironment
     * below.
     *
     * A client document using testharness can use fetch_tests_from_worker() to
     * retrieve results from a worker. See apisample16.html.
     */
    function WorkerTestEnvironment() {
        this.name_counter = 0;
        this.all_loaded = true;
        this.message_list = [];
        this.message_ports = [];
    }

    WorkerTestEnvironment.prototype._dispatch = function(message) {
        this.message_list.push(message);
        for (var i = 0; i < this.message_ports.length; ++i)
        {
            this.message_ports[i].postMessage(message);
        }
    };

    // The only requirement is that port has a postMessage() method. It doesn't
    // have to be an instance of a MessagePort, and often isn't.
    WorkerTestEnvironment.prototype._add_message_port = function(port) {
        this.message_ports.push(port);
        for (var i = 0; i < this.message_list.length; ++i)
        {
            port.postMessage(this.message_list[i]);
        }
    };

    WorkerTestEnvironment.prototype.next_default_test_name = function() {
        var suffix = this.name_counter > 0 ? " " + this.name_counter : "";
        this.name_counter++;
        return "Untitled" + suffix;
    };

    WorkerTestEnvironment.prototype.on_new_harness_properties = function() {};

    WorkerTestEnvironment.prototype.on_tests_ready = function() {
        var this_obj = this;
        add_start_callback(
                function(properties) {
                    this_obj._dispatch({
                        type: "start",
                        properties: properties,
                    });
                });
        add_test_state_callback(
                function(test) {
                    this_obj._dispatch({
                        type: "test_state",
                        test: test.structured_clone()
                    });
                });
        add_result_callback(
                function(test) {
                    this_obj._dispatch({
                        type: "result",
                        test: test.structured_clone()
                    });
                });
        add_completion_callback(
                function(tests, harness_status) {
                    this_obj._dispatch({
                        type: "complete",
                        tests: map(tests,
                            function(test) {
                                return test.structured_clone();
                            }),
                        status: harness_status.structured_clone()
                    });
                });
    };

    WorkerTestEnvironment.prototype.add_on_loaded_callback = function() {};

    WorkerTestEnvironment.prototype.test_timeout = function() {
        // Tests running in a worker don't have a default timeout. I.e. all
        // worker tests behave as if settings.explicit_timeout is true.
        return null;
    };

    WorkerTestEnvironment.prototype.global_scope = function() {
        return self;
    };

    /*
     * Dedicated web workers.
     * https://html.spec.whatwg.org/multipage/workers.html#dedicatedworkerglobalscope
     *
     * This class is used as the test_environment when testharness is running
     * inside a dedicated worker.
     */
    function DedicatedWorkerTestEnvironment() {
        WorkerTestEnvironment.call(this);
        // self is an instance of DedicatedWorkerGlobalScope which exposes
        // a postMessage() method for communicating via the message channel
        // established when the worker is created.
        this._add_message_port(self);
    }
    DedicatedWorkerTestEnvironment.prototype = Object.create(WorkerTestEnvironment.prototype);

    DedicatedWorkerTestEnvironment.prototype.on_tests_ready = function() {
        WorkerTestEnvironment.prototype.on_tests_ready.call(this);
        // In the absence of an onload notification, we a require dedicated
        // workers to explicitly signal when the tests are done.
        tests.wait_for_finish = true;
    };

    /*
     * Shared web workers.
     * https://html.spec.whatwg.org/multipage/workers.html#sharedworkerglobalscope
     *
     * This class is used as the test_environment when testharness is running
     * inside a shared web worker.
     */
    function SharedWorkerTestEnvironment() {
        WorkerTestEnvironment.call(this);
        var this_obj = this;
        // Shared workers receive message ports via the 'onconnect' event for
        // each connection.
        self.addEventListener("connect",
                function(message_event) {
                    this_obj._add_message_port(message_event.source);
                });
    }
    SharedWorkerTestEnvironment.prototype = Object.create(WorkerTestEnvironment.prototype);

    SharedWorkerTestEnvironment.prototype.on_tests_ready = function() {
        WorkerTestEnvironment.prototype.on_tests_ready.call(this);
        // In the absence of an onload notification, we a require shared
        // workers to explicitly signal when the tests are done.
        tests.wait_for_finish = true;
    };

    /*
     * Service workers.
     * http://www.w3.org/TR/service-workers/
     *
     * This class is used as the test_environment when testharness is running
     * inside a service worker.
     */
    function ServiceWorkerTestEnvironment() {
        WorkerTestEnvironment.call(this);
        this.all_loaded = false;
        this.on_loaded_callback = null;
        var this_obj = this;
        self.addEventListener("message",
                function(event) {
                    if (event.data.type && event.data.type === "connect") {
                        if (event.ports && event.ports[0]) {
                            // If a MessageChannel was passed, then use it to
                            // send results back to the main window.  This
                            // allows the tests to work even if the browser
                            // does not fully support MessageEvent.source in
                            // ServiceWorkers yet.
                            this_obj._add_message_port(event.ports[0]);
                            event.ports[0].start();
                        } else {
                            // If there is no MessageChannel, then attempt to
                            // use the MessageEvent.source to send results
                            // back to the main window.
                            this_obj._add_message_port(event.source);
                        }
                    }
                });

        // The oninstall event is received after the service worker script and
        // all imported scripts have been fetched and executed. It's the
        // equivalent of an onload event for a document. All tests should have
        // been added by the time this event is received, thus it's not
        // necessary to wait until the onactivate event.
        on_event(self, "install",
                function(event) {
                    this_obj.all_loaded = true;
                    if (this_obj.on_loaded_callback) {
                        this_obj.on_loaded_callback();
                    }
                });
    }
    ServiceWorkerTestEnvironment.prototype = Object.create(WorkerTestEnvironment.prototype);

    ServiceWorkerTestEnvironment.prototype.add_on_loaded_callback = function(callback) {
        if (this.all_loaded) {
            callback();
        } else {
            this.on_loaded_callback = callback;
        }
    };

    function create_test_environment() {
        if ('document' in self) {
            return new WindowTestEnvironment();
        }
        if ('DedicatedWorkerGlobalScope' in self &&
            self instanceof DedicatedWorkerGlobalScope) {
            return new DedicatedWorkerTestEnvironment();
        }
        if ('SharedWorkerGlobalScope' in self &&
            self instanceof SharedWorkerGlobalScope) {
            return new SharedWorkerTestEnvironment();
        }
        if ('ServiceWorkerGlobalScope' in self &&
            self instanceof ServiceWorkerGlobalScope) {
            return new ServiceWorkerTestEnvironment();
        }
        throw new Error("Unsupported test environment");
    }

    var test_environment = create_test_environment();

    function is_shared_worker(worker) {
        return 'SharedWorker' in self && worker instanceof SharedWorker;
    }

    function is_service_worker(worker) {
        return 'ServiceWorker' in self && worker instanceof ServiceWorker;
    }

    /*
     * API functions
     */

    function test(func, name, properties)
    {
        var test_name = name ? name : test_environment.next_default_test_name();
        properties = properties ? properties : {};
        var test_obj = new Test(test_name, properties);
        test_obj.step(func, test_obj, test_obj);
        if (test_obj.phase === test_obj.phases.STARTED) {
            test_obj.done();
        }
    }

    function async_test(func, name, properties)
    {
        if (typeof func !== "function") {
            properties = name;
            name = func;
            func = null;
        }
        var test_name = name ? name : test_environment.next_default_test_name();
        properties = properties ? properties : {};
        var test_obj = new Test(test_name, properties);
        if (func) {
            test_obj.step(func, test_obj, test_obj);
        }
        return test_obj;
    }

    function promise_test(func, name, properties) {
        var test = async_test(name, properties);
        // If there is no promise tests queue make one.
        test.step(function() {
            if (!tests.promise_tests) {
                tests.promise_tests = Promise.resolve();
            }
        });
        tests.promise_tests = tests.promise_tests.then(function() {
            return Promise.resolve(test.step(func, test, test))
                .then(
                    function() {
                        test.done();
                    })
                .catch(test.step_func(
                    function(value) {
                        if (value instanceof AssertionError) {
                            throw value;
                        }
                        assert(false, "promise_test", null,
                               "Unhandled rejection with value: ${value}", {value:value});
                    }));
        });
    }

    function promise_rejects(test, expected, promise) {
        return promise.then(test.unreached_func("Should have rejected.")).catch(function(e) {
            assert_throws(expected, function() { throw e });
        });
    }

    /**
     * This constructor helper allows DOM events to be handled using Promises,
     * which can make it a lot easier to test a very specific series of events,
     * including ensuring that unexpected events are not fired at any point.
     */
    function EventWatcher(test, watchedNode, eventTypes)
    {
        if (typeof eventTypes == 'string') {
            eventTypes = [eventTypes];
        }

        var waitingFor = null;

        var eventHandler = test.step_func(function(evt) {
            assert_true(!!waitingFor,
                        'Not expecting event, but got ' + evt.type + ' event');
            assert_equals(evt.type, waitingFor.types[0],
                          'Expected ' + waitingFor.types[0] + ' event, but got ' +
                          evt.type + ' event instead');
            if (waitingFor.types.length > 1) {
                // Pop first event from array
                waitingFor.types.shift();
                return;
            }
            // We need to null out waitingFor before calling the resolve function
            // since the Promise's resolve handlers may call wait_for() which will
            // need to set waitingFor.
            var resolveFunc = waitingFor.resolve;
            waitingFor = null;
            resolveFunc(evt);
        });

        for (var i = 0; i < eventTypes.length; i++) {
            watchedNode.addEventListener(eventTypes[i], eventHandler);
        }

        /**
         * Returns a Promise that will resolve after the specified event or
         * series of events has occured.
         */
        this.wait_for = function(types) {
            if (waitingFor) {
                return Promise.reject('Already waiting for an event or events');
            }
            if (typeof types == 'string') {
                types = [types];
            }
            return new Promise(function(resolve, reject) {
                waitingFor = {
                    types: types,
                    resolve: resolve,
                    reject: reject
                };
            });
        };

        function stop_watching() {
            for (var i = 0; i < eventTypes.length; i++) {
                watchedNode.removeEventListener(eventTypes[i], eventHandler);
            }
        };

        test.add_cleanup(stop_watching);

        return this;
    }
    expose(EventWatcher, 'EventWatcher');

    function setup(func_or_properties, maybe_properties)
    {
        var func = null;
        var properties = {};
        if (arguments.length === 2) {
            func = func_or_properties;
            properties = maybe_properties;
        } else if (func_or_properties instanceof Function) {
            func = func_or_properties;
        } else {
            properties = func_or_properties;
        }
        tests.setup(func, properties);
        test_environment.on_new_harness_properties(properties);
    }

    function done() {
        if (tests.tests.length === 0) {
            tests.set_file_is_test();
        }
        if (tests.file_is_test) {
            tests.tests[0].done();
        }
        tests.end_wait();
    }

    function generate_tests(func, args, properties) {
        forEach(args, function(x, i)
                {
                    var name = x[0];
                    test(function()
                         {
                             func.apply(this, x.slice(1));
                         },
                         name,
                         Array.isArray(properties) ? properties[i] : properties);
                });
    }

    function on_event(object, event, callback)
    {
        object.addEventListener(event, callback);
    }

    function step_timeout(f, t) {
        var outer_this = this;
        var args = Array.prototype.slice.call(arguments, 2);
        return setTimeout(function() {
            f.apply(outer_this, args);
        }, t * tests.timeout_multiplier);
    }

    expose(test, 'test');
    expose(async_test, 'async_test');
    expose(promise_test, 'promise_test');
    expose(promise_rejects, 'promise_rejects');
    expose(generate_tests, 'generate_tests');
    expose(setup, 'setup');
    expose(done, 'done');
    expose(on_event, 'on_event');
    expose(step_timeout, 'step_timeout');

    /*
     * Return a string truncated to the given length, with ... added at the end
     * if it was longer.
     */
    function truncate(s, len)
    {
        if (s.length > len) {
            return s.substring(0, len - 3) + "...";
        }
        return s;
    }

    /*
     * Return true if object is probably a Node object.
     */
    function is_node(object)
    {
        // I use duck-typing instead of instanceof, because
        // instanceof doesn't work if the node is from another window (like an
        // iframe's contentWindow):
        // http://www.w3.org/Bugs/Public/show_bug.cgi?id=12295
        if ("nodeType" in object &&
            "nodeName" in object &&
            "nodeValue" in object &&
            "childNodes" in object) {
            try {
                object.nodeType;
            } catch (e) {
                // The object is probably Node.prototype or another prototype
                // object that inherits from it, and not a Node instance.
                return false;
            }
            return true;
        }
        return false;
    }

    /*
     * Convert a value to a nice, human-readable string
     */
    function format_value(val, seen)
    {
        if (!seen) {
            seen = [];
        }
        if (typeof val === "object" && val !== null) {
            if (seen.includes(val)) {
                return "[...]";
            }
            seen.push(val);
        }
        if (Array.isArray(val)) {
            return "[" + val.map(function(x) {return format_value(x, seen);}).join(", ") + "]";
        }

        switch (typeof val) {
        case "string":
            val = val.replace("\\", "\\\\");
            for (var i = 0; i < 32; i++) {
                var replace = "\\";
                switch (i) {
                case 0: replace += "0"; break;
                case 1: replace += "x01"; break;
                case 2: replace += "x02"; break;
                case 3: replace += "x03"; break;
                case 4: replace += "x04"; break;
                case 5: replace += "x05"; break;
                case 6: replace += "x06"; break;
                case 7: replace += "x07"; break;
                case 8: replace += "b"; break;
                case 9: replace += "t"; break;
                case 10: replace += "n"; break;
                case 11: replace += "v"; break;
                case 12: replace += "f"; break;
                case 13: replace += "r"; break;
                case 14: replace += "x0e"; break;
                case 15: replace += "x0f"; break;
                case 16: replace += "x10"; break;
                case 17: replace += "x11"; break;
                case 18: replace += "x12"; break;
                case 19: replace += "x13"; break;
                case 20: replace += "x14"; break;
                case 21: replace += "x15"; break;
                case 22: replace += "x16"; break;
                case 23: replace += "x17"; break;
                case 24: replace += "x18"; break;
                case 25: replace += "x19"; break;
                case 26: replace += "x1a"; break;
                case 27: replace += "x1b"; break;
                case 28: replace += "x1c"; break;
                case 29: replace += "x1d"; break;
                case 30: replace += "x1e"; break;
                case 31: replace += "x1f"; break;
                }
                val = val.replace(RegExp(String.fromCharCode(i), "g"), replace);
            }
            return '"' + val.replace(/"/g, '\\"') + '"';
        case "boolean":
        case "undefined":
            return String(val);
        case "number":
            // In JavaScript, -0 === 0 and String(-0) == "0", so we have to
            // special-case.
            if (val === -0 && 1/val === -Infinity) {
                return "-0";
            }
            return String(val);
        case "object":
            if (val === null) {
                return "null";
            }

            // Special-case Node objects, since those come up a lot in my tests.  I
            // ignore namespaces.
            if (is_node(val)) {
                switch (val.nodeType) {
                case Node.ELEMENT_NODE:
                    var ret = "<" + val.localName;
                    for (var i = 0; i < val.attributes.length; i++) {
                        ret += " " + val.attributes[i].name + '="' + val.attributes[i].value + '"';
                    }
                    ret += ">" + val.innerHTML + " + val.localName + ">";
                    return "Element node " + truncate(ret, 60);
                case Node.TEXT_NODE:
                    return 'Text node "' + truncate(val.data, 60) + '"';
                case Node.PROCESSING_INSTRUCTION_NODE:
                    return "ProcessingInstruction node with target " + format_value(truncate(val.target, 60)) + " and data " + format_value(truncate(val.data, 60));
                case Node.COMMENT_NODE:
                    return "Comment node ";
                case Node.DOCUMENT_NODE:
                    return "Document node with " + val.childNodes.length + (val.childNodes.length == 1 ? " child" : " children");
                case Node.DOCUMENT_TYPE_NODE:
                    return "DocumentType node";
                case Node.DOCUMENT_FRAGMENT_NODE:
                    return "DocumentFragment node with " + val.childNodes.length + (val.childNodes.length == 1 ? " child" : " children");
                default:
                    return "Node object of unknown type";
                }
            }

        /* falls through */
        default:
            return typeof val + ' "' + truncate(String(val), 60) + '"';
        }
    }
    expose(format_value, "format_value");

    /*
     * Assertions
     */

    function assert_true(actual, description)
    {
        assert(actual === true, "assert_true", description,
                                "expected true got ${actual}", {actual:actual});
    }
    expose(assert_true, "assert_true");

    function assert_false(actual, description)
    {
        assert(actual === false, "assert_false", description,
                                 "expected false got ${actual}", {actual:actual});
    }
    expose(assert_false, "assert_false");

    function same_value(x, y) {
        if (y !== y) {
            //NaN case
            return x !== x;
        }
        if (x === 0 && y === 0) {
            //Distinguish +0 and -0
            return 1/x === 1/y;
        }
        return x === y;
    }

    function assert_equals(actual, expected, description)
    {
         /*
          * Test if two primitives are equal or two objects
          * are the same object
          */
        if (typeof actual != typeof expected) {
            assert(false, "assert_equals", description,
                          "expected (" + typeof expected + ") ${expected} but got (" + typeof actual + ") ${actual}",
                          {expected:expected, actual:actual});
            return;
        }
        assert(same_value(actual, expected), "assert_equals", description,
                                             "expected ${expected} but got ${actual}",
                                             {expected:expected, actual:actual});
    }
    expose(assert_equals, "assert_equals");

    function assert_not_equals(actual, expected, description)
    {
         /*
          * Test if two primitives are unequal or two objects
          * are different objects
          */
        assert(!same_value(actual, expected), "assert_not_equals", description,
                                              "got disallowed value ${actual}",
                                              {actual:actual});
    }
    expose(assert_not_equals, "assert_not_equals");

    function assert_in_array(actual, expected, description)
    {
        assert(expected.includes(actual), "assert_in_array", description,
                                               "value ${actual} not in array ${expected}",
                                               {actual:actual, expected:expected});
    }
    expose(assert_in_array, "assert_in_array");

    function assert_object_equals(actual, expected, description)
    {
         //This needs to be improved a great deal
         function check_equal(actual, expected, stack)
         {
             stack.push(actual);

             var p;
             for (p in actual) {
                 assert(expected.hasOwnProperty(p), "assert_object_equals", description,
                                                    "unexpected property ${p}", {p:p});

                 if (typeof actual[p] === "object" && actual[p] !== null) {
                     if (!stack.includes(actual[p])) {
                         check_equal(actual[p], expected[p], stack);
                     }
                 } else {
                     assert(same_value(actual[p], expected[p]), "assert_object_equals", description,
                                                       "property ${p} expected ${expected} got ${actual}",
                                                       {p:p, expected:expected, actual:actual});
                 }
             }
             for (p in expected) {
                 assert(actual.hasOwnProperty(p),
                        "assert_object_equals", description,
                        "expected property ${p} missing", {p:p});
             }
             stack.pop();
         }
         check_equal(actual, expected, []);
    }
    expose(assert_object_equals, "assert_object_equals");

    function assert_array_equals(actual, expected, description)
    {
        assert(actual.length === expected.length,
               "assert_array_equals", description,
               "lengths differ, expected ${expected} got ${actual}",
               {expected:expected.length, actual:actual.length});

        for (var i = 0; i < actual.length; i++) {
            assert(actual.hasOwnProperty(i) === expected.hasOwnProperty(i),
                   "assert_array_equals", description,
                   "property ${i}, property expected to be ${expected} but was ${actual}",
                   {i:i, expected:expected.hasOwnProperty(i) ? "present" : "missing",
                   actual:actual.hasOwnProperty(i) ? "present" : "missing"});
            assert(same_value(expected[i], actual[i]),
                   "assert_array_equals", description,
                   "property ${i}, expected ${expected} but got ${actual}",
                   {i:i, expected:expected[i], actual:actual[i]});
        }
    }
    expose(assert_array_equals, "assert_array_equals");

    function assert_approx_equals(actual, expected, epsilon, description)
    {
        /*
         * Test if two primitive numbers are equal withing +/- epsilon
         */
        assert(typeof actual === "number",
               "assert_approx_equals", description,
               "expected a number but got a ${type_actual}",
               {type_actual:typeof actual});

        assert(Math.abs(actual - expected) <= epsilon,
               "assert_approx_equals", description,
               "expected ${expected} +/- ${epsilon} but got ${actual}",
               {expected:expected, actual:actual, epsilon:epsilon});
    }
    expose(assert_approx_equals, "assert_approx_equals");

    function assert_less_than(actual, expected, description)
    {
        /*
         * Test if a primitive number is less than another
         */
        assert(typeof actual === "number",
               "assert_less_than", description,
               "expected a number but got a ${type_actual}",
               {type_actual:typeof actual});

        assert(actual < expected,
               "assert_less_than", description,
               "expected a number less than ${expected} but got ${actual}",
               {expected:expected, actual:actual});
    }
    expose(assert_less_than, "assert_less_than");

    function assert_greater_than(actual, expected, description)
    {
        /*
         * Test if a primitive number is greater than another
         */
        assert(typeof actual === "number",
               "assert_greater_than", description,
               "expected a number but got a ${type_actual}",
               {type_actual:typeof actual});

        assert(actual > expected,
               "assert_greater_than", description,
               "expected a number greater than ${expected} but got ${actual}",
               {expected:expected, actual:actual});
    }
    expose(assert_greater_than, "assert_greater_than");

    function assert_between_exclusive(actual, lower, upper, description)
    {
        /*
         * Test if a primitive number is between two others
         */
        assert(typeof actual === "number",
               "assert_between_exclusive", description,
               "expected a number but got a ${type_actual}",
               {type_actual:typeof actual});

        assert(actual > lower && actual < upper,
               "assert_between_exclusive", description,
               "expected a number greater than ${lower} " +
               "and less than ${upper} but got ${actual}",
               {lower:lower, upper:upper, actual:actual});
    }
    expose(assert_between_exclusive, "assert_between_exclusive");

    function assert_less_than_equal(actual, expected, description)
    {
        /*
         * Test if a primitive number is less than or equal to another
         */
        assert(typeof actual === "number",
               "assert_less_than_equal", description,
               "expected a number but got a ${type_actual}",
               {type_actual:typeof actual});

        assert(actual <= expected,
               "assert_less_than_equal", description,
               "expected a number less than or equal to ${expected} but got ${actual}",
               {expected:expected, actual:actual});
    }
    expose(assert_less_than_equal, "assert_less_than_equal");

    function assert_greater_than_equal(actual, expected, description)
    {
        /*
         * Test if a primitive number is greater than or equal to another
         */
        assert(typeof actual === "number",
               "assert_greater_than_equal", description,
               "expected a number but got a ${type_actual}",
               {type_actual:typeof actual});

        assert(actual >= expected,
               "assert_greater_than_equal", description,
               "expected a number greater than or equal to ${expected} but got ${actual}",
               {expected:expected, actual:actual});
    }
    expose(assert_greater_than_equal, "assert_greater_than_equal");

    function assert_between_inclusive(actual, lower, upper, description)
    {
        /*
         * Test if a primitive number is between to two others or equal to either of them
         */
        assert(typeof actual === "number",
               "assert_between_inclusive", description,
               "expected a number but got a ${type_actual}",
               {type_actual:typeof actual});

        assert(actual >= lower && actual <= upper,
               "assert_between_inclusive", description,
               "expected a number greater than or equal to ${lower} " +
               "and less than or equal to ${upper} but got ${actual}",
               {lower:lower, upper:upper, actual:actual});
    }
    expose(assert_between_inclusive, "assert_between_inclusive");

    function assert_regexp_match(actual, expected, description) {
        /*
         * Test if a string (actual) matches a regexp (expected)
         */
        assert(expected.test(actual),
               "assert_regexp_match", description,
               "expected ${expected} but got ${actual}",
               {expected:expected, actual:actual});
    }
    expose(assert_regexp_match, "assert_regexp_match");

    function assert_class_string(object, class_string, description) {
        assert_equals({}.toString.call(object), "[object " + class_string + "]",
                      description);
    }
    expose(assert_class_string, "assert_class_string");


    function _assert_own_property(name) {
        return function(object, property_name, description)
        {
            assert(object.hasOwnProperty(property_name),
                   name, description,
                   "expected property ${p} missing", {p:property_name});
        };
    }
    expose(_assert_own_property("assert_exists"), "assert_exists");
    expose(_assert_own_property("assert_own_property"), "assert_own_property");

    function assert_not_exists(object, property_name, description)
    {
        assert(!object.hasOwnProperty(property_name),
               "assert_not_exists", description,
               "unexpected property ${p} found", {p:property_name});
    }
    expose(assert_not_exists, "assert_not_exists");

    function _assert_inherits(name) {
        return function (object, property_name, description)
        {
            assert(typeof object === "object",
                   name, description,
                   "provided value is not an object");

            assert("hasOwnProperty" in object,
                   name, description,
                   "provided value is an object but has no hasOwnProperty method");

            assert(!object.hasOwnProperty(property_name),
                   name, description,
                   "property ${p} found on object expected in prototype chain",
                   {p:property_name});

            assert(property_name in object,
                   name, description,
                   "property ${p} not found in prototype chain",
                   {p:property_name});
        };
    }
    expose(_assert_inherits("assert_inherits"), "assert_inherits");
    expose(_assert_inherits("assert_idl_attribute"), "assert_idl_attribute");

    function assert_readonly(object, property_name, description)
    {
         var initial_value = object[property_name];
         try {
             //Note that this can have side effects in the case where
             //the property has PutForwards
             object[property_name] = initial_value + "a"; //XXX use some other value here?
             assert(same_value(object[property_name], initial_value),
                    "assert_readonly", description,
                    "changing property ${p} succeeded",
                    {p:property_name});
         } finally {
             object[property_name] = initial_value;
         }
    }
    expose(assert_readonly, "assert_readonly");

    function assert_throws(code, func, description)
    {
        try {
            func.call(this);
            assert(false, "assert_throws", description,
                   "${func} did not throw", {func:func});
        } catch (e) {
            if (e instanceof AssertionError) {
                throw e;
            }
            if (code === null) {
                return;
            }
            if (typeof code === "object") {
                assert(typeof e == "object" && "name" in e && e.name == code.name,
                       "assert_throws", description,
                       "${func} threw ${actual} (${actual_name}) expected ${expected} (${expected_name})",
                                    {func:func, actual:e, actual_name:e.name,
                                     expected:code,
                                     expected_name:code.name});
                return;
            }

            var code_name_map = {
                INDEX_SIZE_ERR: 'IndexSizeError',
                HIERARCHY_REQUEST_ERR: 'HierarchyRequestError',
                WRONG_DOCUMENT_ERR: 'WrongDocumentError',
                INVALID_CHARACTER_ERR: 'InvalidCharacterError',
                NO_MODIFICATION_ALLOWED_ERR: 'NoModificationAllowedError',
                NOT_FOUND_ERR: 'NotFoundError',
                NOT_SUPPORTED_ERR: 'NotSupportedError',
                INVALID_STATE_ERR: 'InvalidStateError',
                SYNTAX_ERR: 'SyntaxError',
                INVALID_MODIFICATION_ERR: 'InvalidModificationError',
                NAMESPACE_ERR: 'NamespaceError',
                INVALID_ACCESS_ERR: 'InvalidAccessError',
                TYPE_MISMATCH_ERR: 'TypeMismatchError',
                SECURITY_ERR: 'SecurityError',
                NETWORK_ERR: 'NetworkError',
                ABORT_ERR: 'AbortError',
                URL_MISMATCH_ERR: 'URLMismatchError',
                QUOTA_EXCEEDED_ERR: 'QuotaExceededError',
                TIMEOUT_ERR: 'TimeoutError',
                INVALID_NODE_TYPE_ERR: 'InvalidNodeTypeError',
                DATA_CLONE_ERR: 'DataCloneError'
            };

            var name = code in code_name_map ? code_name_map[code] : code;

            var name_code_map = {
                IndexSizeError: 1,
                HierarchyRequestError: 3,
                WrongDocumentError: 4,
                InvalidCharacterError: 5,
                NoModificationAllowedError: 7,
                NotFoundError: 8,
                NotSupportedError: 9,
                InvalidStateError: 11,
                SyntaxError: 12,
                InvalidModificationError: 13,
                NamespaceError: 14,
                InvalidAccessError: 15,
                TypeMismatchError: 17,
                SecurityError: 18,
                NetworkError: 19,
                AbortError: 20,
                URLMismatchError: 21,
                QuotaExceededError: 22,
                TimeoutError: 23,
                InvalidNodeTypeError: 24,
                DataCloneError: 25,

                EncodingError: 0,
                NotReadableError: 0,
                UnknownError: 0,
                ConstraintError: 0,
                DataError: 0,
                TransactionInactiveError: 0,
                ReadOnlyError: 0,
                VersionError: 0,
                OperationError: 0,
            };

            if (!(name in name_code_map)) {
                throw new AssertionError('Test bug: unrecognized DOMException code "' + code + '" passed to assert_throws()');
            }

            var required_props = { code: name_code_map[name] };

            if (required_props.code === 0 ||
               (typeof e == "object" &&
                "name" in e &&
                e.name !== e.name.toUpperCase() &&
                e.name !== "DOMException")) {
                // New style exception: also test the name property.
                required_props.name = name;
            }

            //We'd like to test that e instanceof the appropriate interface,
            //but we can't, because we don't know what window it was created
            //in.  It might be an instanceof the appropriate interface on some
            //unknown other window.  TODO: Work around this somehow?

            assert(typeof e == "object",
                   "assert_throws", description,
                   "${func} threw ${e} with type ${type}, not an object",
                   {func:func, e:e, type:typeof e});

            for (var prop in required_props) {
                assert(typeof e == "object" && prop in e && e[prop] == required_props[prop],
                       "assert_throws", description,
                       "${func} threw ${e} that is not a DOMException " + code + ": property ${prop} is equal to ${actual}, expected ${expected}",
                       {func:func, e:e, prop:prop, actual:e[prop], expected:required_props[prop]});
            }
        }
    }
    expose(assert_throws, "assert_throws");

    function assert_unreached(description) {
         assert(false, "assert_unreached", description,
                "Reached unreachable code");
    }
    expose(assert_unreached, "assert_unreached");

    function assert_any(assert_func, actual, expected_array)
    {
        var args = [].slice.call(arguments, 3);
        var errors = [];
        var passed = false;
        forEach(expected_array,
                function(expected)
                {
                    try {
                        assert_func.apply(this, [actual, expected].concat(args));
                        passed = true;
                    } catch (e) {
                        errors.push(e.message);
                    }
                });
        if (!passed) {
            throw new AssertionError(errors.join("\n\n"));
        }
    }
    expose(assert_any, "assert_any");

    function Test(name, properties)
    {
        if (tests.file_is_test && tests.tests.length) {
            throw new Error("Tried to create a test with file_is_test");
        }
        this.name = name;

        this.phase = this.phases.INITIAL;

        this.status = this.NOTRUN;
        this.timeout_id = null;
        this.index = null;

        this.properties = properties;
        var timeout = properties.timeout ? properties.timeout : settings.test_timeout;
        if (timeout !== null) {
            this.timeout_length = timeout * tests.timeout_multiplier;
        } else {
            this.timeout_length = null;
        }

        this.message = null;
        this.stack = null;

        this.steps = [];

        this.cleanup_callbacks = [];

        tests.push(this);
    }

    Test.statuses = {
        PASS:0,
        FAIL:1,
        TIMEOUT:2,
        NOTRUN:3
    };

    Test.prototype = merge({}, Test.statuses);

    Test.prototype.phases = {
        INITIAL:0,
        STARTED:1,
        HAS_RESULT:2,
        COMPLETE:3
    };

    Test.prototype.structured_clone = function()
    {
        if (!this._structured_clone) {
            var msg = this.message;
            msg = msg ? String(msg) : msg;
            this._structured_clone = merge({
                name:String(this.name),
                properties:merge({}, this.properties),
            }, Test.statuses);
        }
        this._structured_clone.status = this.status;
        this._structured_clone.message = this.message;
        this._structured_clone.stack = this.stack;
        this._structured_clone.index = this.index;
        return this._structured_clone;
    };

    Test.prototype.step = function(func, this_obj)
    {
        if (this.phase > this.phases.STARTED) {
            return;
        }
        this.phase = this.phases.STARTED;
        //If we don't get a result before the harness times out that will be a test timout
        this.set_status(this.TIMEOUT, "Test timed out");

        tests.started = true;
        tests.notify_test_state(this);

        if (this.timeout_id === null) {
            this.set_timeout();
        }

        this.steps.push(func);

        if (arguments.length === 1) {
            this_obj = this;
        }

        try {
            return func.apply(this_obj, Array.prototype.slice.call(arguments, 2));
        } catch (e) {
            if (this.phase >= this.phases.HAS_RESULT) {
                return;
            }
            var message = String((typeof e === "object" && e !== null) ? e.message : e);
            var stack = e.stack ? e.stack : null;

            this.set_status(this.FAIL, message, stack);
            this.phase = this.phases.HAS_RESULT;
            this.done();
        }
    };

    Test.prototype.step_func = function(func, this_obj)
    {
        var test_this = this;

        if (arguments.length === 1) {
            this_obj = test_this;
        }

        return function()
        {
            return test_this.step.apply(test_this, [func, this_obj].concat(
                Array.prototype.slice.call(arguments)));
        };
    };

    Test.prototype.step_func_done = function(func, this_obj)
    {
        var test_this = this;

        if (arguments.length === 1) {
            this_obj = test_this;
        }

        return function()
        {
            if (func) {
                test_this.step.apply(test_this, [func, this_obj].concat(
                    Array.prototype.slice.call(arguments)));
            }
            test_this.done();
        };
    };

    Test.prototype.unreached_func = function(description)
    {
        return this.step_func(function() {
            assert_unreached(description);
        });
    };

    Test.prototype.step_timeout = function(f, timeout) {
        var test_this = this;
        var args = Array.prototype.slice.call(arguments, 2);
        return setTimeout(this.step_func(function() {
            return f.apply(test_this, args);
        }, timeout * tests.timeout_multiplier));
    }

    Test.prototype.add_cleanup = function(callback) {
        this.cleanup_callbacks.push(callback);
    };

    Test.prototype.force_timeout = function() {
        this.set_status(this.TIMEOUT);
        this.phase = this.phases.HAS_RESULT;
    };

    Test.prototype.set_timeout = function()
    {
        if (this.timeout_length !== null) {
            var this_obj = this;
            this.timeout_id = setTimeout(function()
                                         {
                                             this_obj.timeout();
                                         }, this.timeout_length);
        }
    };

    Test.prototype.set_status = function(status, message, stack)
    {
        this.status = status;
        this.message = message;
        this.stack = stack ? stack : null;
    };

    Test.prototype.timeout = function()
    {
        this.timeout_id = null;
        this.set_status(this.TIMEOUT, "Test timed out");
        this.phase = this.phases.HAS_RESULT;
        this.done();
    };

    Test.prototype.done = function()
    {
        if (this.phase == this.phases.COMPLETE) {
            return;
        }

        if (this.phase <= this.phases.STARTED) {
            this.set_status(this.PASS, null);
        }

        this.phase = this.phases.COMPLETE;

        clearTimeout(this.timeout_id);
        tests.result(this);
        this.cleanup();
    };

    Test.prototype.cleanup = function() {
        forEach(this.cleanup_callbacks,
                function(cleanup_callback) {
                    cleanup_callback();
                });
    };

    /*
     * A RemoteTest object mirrors a Test object on a remote worker. The
     * associated RemoteWorker updates the RemoteTest object in response to
     * received events. In turn, the RemoteTest object replicates these events
     * on the local document. This allows listeners (test result reporting
     * etc..) to transparently handle local and remote events.
     */
    function RemoteTest(clone) {
        var this_obj = this;
        Object.keys(clone).forEach(
                function(key) {
                    this_obj[key] = clone[key];
                });
        this.index = null;
        this.phase = this.phases.INITIAL;
        this.update_state_from(clone);
        tests.push(this);
    }

    RemoteTest.prototype.structured_clone = function() {
        var clone = {};
        Object.keys(this).forEach(
                key => {
                    if (typeof(this[key]) === "object") {
                        clone[key] = merge({}, this[key]);
                    } else {
                        clone[key] = this[key];
                    }
                });
        clone.phases = merge({}, this.phases);
        return clone;
    };

    RemoteTest.prototype.cleanup = function() {};
    RemoteTest.prototype.phases = Test.prototype.phases;
    RemoteTest.prototype.update_state_from = function(clone) {
        this.status = clone.status;
        this.message = clone.message;
        this.stack = clone.stack;
        if (this.phase === this.phases.INITIAL) {
            this.phase = this.phases.STARTED;
        }
    };
    RemoteTest.prototype.done = function() {
        this.phase = this.phases.COMPLETE;
    }

    /*
     * A RemoteWorker listens for test events from a worker. These events are
     * then used to construct and maintain RemoteTest objects that mirror the
     * tests running on the remote worker.
     */
    function RemoteWorker(worker) {
        this.running = true;
        this.tests = new Array();

        var this_obj = this;
        worker.onerror = function(error) { this_obj.worker_error(error); };

        var message_port;

        if (is_service_worker(worker)) {
            if (window.MessageChannel) {
                // The ServiceWorker's implicit MessagePort is currently not
                // reliably accessible from the ServiceWorkerGlobalScope due to
                // Blink setting MessageEvent.source to null for messages sent
                // via ServiceWorker.postMessage(). Until that's resolved,
                // create an explicit MessageChannel and pass one end to the
                // worker.
                var message_channel = new MessageChannel();
                message_port = message_channel.port1;
                message_port.start();
                worker.postMessage({type: "connect"}, [message_channel.port2]);
            } else {
                // If MessageChannel is not available, then try the
                // ServiceWorker.postMessage() approach using MessageEvent.source
                // on the other end.
                message_port = navigator.serviceWorker;
                worker.postMessage({type: "connect"});
            }
        } else if (is_shared_worker(worker)) {
            message_port = worker.port;
        } else {
            message_port = worker;
        }

        // Keeping a reference to the worker until worker_done() is seen
        // prevents the Worker object and its MessageChannel from going away
        // before all the messages are dispatched.
        this.worker = worker;

        message_port.onmessage =
            function(message) {
                if (this_obj.running && (message.data.type in this_obj.message_handlers)) {
                    this_obj.message_handlers[message.data.type].call(this_obj, message.data);
                }
            };
    }

    RemoteWorker.prototype.worker_error = function(error) {
        var message = error.message || String(error);
        var filename = (error.filename ? " " + error.filename: "");
        // FIXME: Display worker error states separately from main document
        // error state.
        this.worker_done({
            status: {
                status: tests.status.ERROR,
                message: "Error in worker" + filename + ": " + message,
                stack: error.stack
            }
        });
        error.preventDefault();
    };

    RemoteWorker.prototype.test_state = function(data) {
        var remote_test = this.tests[data.test.index];
        if (!remote_test) {
            remote_test = new RemoteTest(data.test);
            this.tests[data.test.index] = remote_test;
        }
        remote_test.update_state_from(data.test);
        tests.notify_test_state(remote_test);
    };

    RemoteWorker.prototype.test_done = function(data) {
        var remote_test = this.tests[data.test.index];
        remote_test.update_state_from(data.test);
        remote_test.done();
        tests.result(remote_test);
    };

    RemoteWorker.prototype.worker_done = function(data) {
        if (tests.status.status === null &&
            data.status.status !== data.status.OK) {
            tests.status.status = data.status.status;
            tests.status.message = data.status.message;
            tests.status.stack = data.status.stack;
        }
        this.running = false;
        this.worker = null;
        if (tests.all_done()) {
            tests.complete();
        }
    };

    RemoteWorker.prototype.message_handlers = {
        test_state: RemoteWorker.prototype.test_state,
        result: RemoteWorker.prototype.test_done,
        complete: RemoteWorker.prototype.worker_done
    };

    /*
     * Harness
     */

    function TestsStatus()
    {
        this.status = null;
        this.message = null;
        this.stack = null;
    }

    TestsStatus.statuses = {
        OK:0,
        ERROR:1,
        TIMEOUT:2
    };

    TestsStatus.prototype = merge({}, TestsStatus.statuses);

    TestsStatus.prototype.structured_clone = function()
    {
        if (!this._structured_clone) {
            var msg = this.message;
            msg = msg ? String(msg) : msg;
            this._structured_clone = merge({
                status:this.status,
                message:msg,
                stack:this.stack
            }, TestsStatus.statuses);
        }
        return this._structured_clone;
    };

    function Tests()
    {
        this.tests = [];
        this.num_pending = 0;

        this.phases = {
            INITIAL:0,
            SETUP:1,
            HAVE_TESTS:2,
            HAVE_RESULTS:3,
            COMPLETE:4
        };
        this.phase = this.phases.INITIAL;

        this.properties = {};

        this.wait_for_finish = false;
        this.processing_callbacks = false;

        this.allow_uncaught_exception = false;

        this.file_is_test = false;

        this.timeout_multiplier = 1;
        this.timeout_length = test_environment.test_timeout();
        this.timeout_id = null;

        this.start_callbacks = [];
        this.test_state_callbacks = [];
        this.test_done_callbacks = [];
        this.all_done_callbacks = [];

        this.pending_workers = [];

        this.status = new TestsStatus();

        var this_obj = this;

        test_environment.add_on_loaded_callback(function() {
            if (this_obj.all_done()) {
                this_obj.complete();
            }
        });

        this.set_timeout();
    }

    Tests.prototype.setup = function(func, properties)
    {
        if (this.phase >= this.phases.HAVE_RESULTS) {
            return;
        }

        if (this.phase < this.phases.SETUP) {
            this.phase = this.phases.SETUP;
        }

        this.properties = properties;

        for (var p in properties) {
            if (properties.hasOwnProperty(p)) {
                var value = properties[p];
                if (p == "allow_uncaught_exception") {
                    this.allow_uncaught_exception = value;
                } else if (p == "explicit_done" && value) {
                    this.wait_for_finish = true;
                } else if (p == "explicit_timeout" && value) {
                    this.timeout_length = null;
                    if (this.timeout_id)
                    {
                        clearTimeout(this.timeout_id);
                    }
                } else if (p == "timeout_multiplier") {
                    this.timeout_multiplier = value;
                }
            }
        }

        if (func) {
            try {
                func();
            } catch (e) {
                this.status.status = this.status.ERROR;
                this.status.message = String(e);
                this.status.stack = e.stack ? e.stack : null;
            }
        }
        this.set_timeout();
    };

    Tests.prototype.set_file_is_test = function() {
        if (this.tests.length > 0) {
            throw new Error("Tried to set file as test after creating a test");
        }
        this.wait_for_finish = true;
        this.file_is_test = true;
        // Create the test, which will add it to the list of tests
        async_test();
    };

    Tests.prototype.set_timeout = function() {
        var this_obj = this;
        clearTimeout(this.timeout_id);
        if (this.timeout_length !== null) {
            this.timeout_id = setTimeout(function() {
                                             this_obj.timeout();
                                         }, this.timeout_length);
        }
    };

    Tests.prototype.timeout = function() {
        if (this.status.status === null) {
            this.status.status = this.status.TIMEOUT;
        }
        this.complete();
    };

    Tests.prototype.end_wait = function()
    {
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