How to use assert_throws_js_impl method in wpt

Best JavaScript code snippet using wpt

testharness.js

Source:testharness.js

...586    function promise_rejects_js(test, constructor, promise, description) {587        return bring_promise_to_current_realm(promise)588            .then(test.unreached_func("Should have rejected: " + description))589            .catch(function(e) {590                assert_throws_js_impl(constructor, function() { throw e },591                                      description, "promise_rejects_js");592            });593    }594    /**595     * Assert that a Promise is rejected with the right DOMException.596     *597     * @param test the test argument passed to promise_test598     * @param {number|string} type.  See documentation for assert_throws_dom.599     *600     * For the remaining arguments, there are two ways of calling601     * promise_rejects_dom:602     *603     * 1) If the DOMException is expected to come from the current global, the604     * third argument should be the promise expected to reject, and a fourth,605     * optional, argument is the assertion description.606     *607     * 2) If the DOMException is expected to come from some other global, the608     * third argument should be the DOMException constructor from that global,609     * the fourth argument the promise expected to reject, and the fifth,610     * optional, argument the assertion description.611     */612    function promise_rejects_dom(test, type, promiseOrConstructor, descriptionOrPromise, maybeDescription) {613        let constructor, promise, description;614        if (typeof promiseOrConstructor === "function" &&615            promiseOrConstructor.name === "DOMException") {616            constructor = promiseOrConstructor;617            promise = descriptionOrPromise;618            description = maybeDescription;619        } else {620            constructor = self.DOMException;621            promise = promiseOrConstructor;622            description = descriptionOrPromise;623            assert(maybeDescription === undefined,624                   "Too many args pased to no-constructor version of promise_rejects_dom");625        }626        return bring_promise_to_current_realm(promise)627            .then(test.unreached_func("Should have rejected: " + description))628            .catch(function(e) {629                assert_throws_dom_impl(type, function() { throw e }, description,630                                       "promise_rejects_dom", constructor);631            });632    }633    function promise_rejects_exactly(test, exception, promise, description) {634        return bring_promise_to_current_realm(promise)635            .then(test.unreached_func("Should have rejected: " + description))636            .catch(function(e) {637                assert_throws_exactly_impl(exception, function() { throw e },638                                           description, "promise_rejects_exactly");639            });640    }641    /**642     * This constructor helper allows DOM events to be handled using Promises,643     * which can make it a lot easier to test a very specific series of events,644     * including ensuring that unexpected events are not fired at any point.645     */646    function EventWatcher(test, watchedNode, eventTypes, timeoutPromise)647    {648        if (typeof eventTypes == 'string') {649            eventTypes = [eventTypes];650        }651        var waitingFor = null;652        // This is null unless we are recording all events, in which case it653        // will be an Array object.654        var recordedEvents = null;655        var eventHandler = test.step_func(function(evt) {656            assert_true(!!waitingFor,657                        'Not expecting event, but got ' + evt.type + ' event');658            assert_equals(evt.type, waitingFor.types[0],659                          'Expected ' + waitingFor.types[0] + ' event, but got ' +660                          evt.type + ' event instead');661            if (Array.isArray(recordedEvents)) {662                recordedEvents.push(evt);663            }664            if (waitingFor.types.length > 1) {665                // Pop first event from array666                waitingFor.types.shift();667                return;668            }669            // We need to null out waitingFor before calling the resolve function670            // since the Promise's resolve handlers may call wait_for() which will671            // need to set waitingFor.672            var resolveFunc = waitingFor.resolve;673            waitingFor = null;674            // Likewise, we should reset the state of recordedEvents.675            var result = recordedEvents || evt;676            recordedEvents = null;677            resolveFunc(result);678        });679        for (var i = 0; i < eventTypes.length; i++) {680            watchedNode.addEventListener(eventTypes[i], eventHandler, false);681        }682        /**683         * Returns a Promise that will resolve after the specified event or684         * series of events has occurred.685         *686         * @param options An optional options object. If the 'record' property687         *                on this object has the value 'all', when the Promise688         *                returned by this function is resolved,  *all* Event689         *                objects that were waited for will be returned as an690         *                array.691         *692         * For example,693         *694         * ```js695         * const watcher = new EventWatcher(t, div, [ 'animationstart',696         *                                            'animationiteration',697         *                                            'animationend' ]);698         * return watcher.wait_for([ 'animationstart', 'animationend' ],699         *                         { record: 'all' }).then(evts => {700         *   assert_equals(evts[0].elapsedTime, 0.0);701         *   assert_equals(evts[1].elapsedTime, 2.0);702         * });703         * ```704         */705        this.wait_for = function(types, options) {706            if (waitingFor) {707                return Promise.reject('Already waiting for an event or events');708            }709            if (typeof types == 'string') {710                types = [types];711            }712            if (options && options.record && options.record === 'all') {713                recordedEvents = [];714            }715            return new Promise(function(resolve, reject) {716                var timeout = test.step_func(function() {717                    // If the timeout fires after the events have been received718                    // or during a subsequent call to wait_for, ignore it.719                    if (!waitingFor || waitingFor.resolve !== resolve)720                        return;721                    // This should always fail, otherwise we should have722                    // resolved the promise.723                    assert_true(waitingFor.types.length == 0,724                                'Timed out waiting for ' + waitingFor.types.join(', '));725                    var result = recordedEvents;726                    recordedEvents = null;727                    var resolveFunc = waitingFor.resolve;728                    waitingFor = null;729                    resolveFunc(result);730                });731                if (timeoutPromise) {732                    timeoutPromise().then(timeout);733                }734                waitingFor = {735                    types: types,736                    resolve: resolve,737                    reject: reject738                };739            });740        };741        function stop_watching() {742            for (var i = 0; i < eventTypes.length; i++) {743                watchedNode.removeEventListener(eventTypes[i], eventHandler, false);744            }745        };746        test._add_cleanup(stop_watching);747        return this;748    }749    expose(EventWatcher, 'EventWatcher');750    function setup(func_or_properties, maybe_properties)751    {752        var func = null;753        var properties = {};754        if (arguments.length === 2) {755            func = func_or_properties;756            properties = maybe_properties;757        } else if (func_or_properties instanceof Function) {758            func = func_or_properties;759        } else {760            properties = func_or_properties;761        }762        tests.setup(func, properties);763        test_environment.on_new_harness_properties(properties);764    }765    function promise_setup(func, maybe_properties)766    {767        if (typeof func !== "function") {768            tests.set_status(tests.status.ERROR,769                             "promise_test invoked without a function");770            tests.complete();771            return;772        }773        tests.promise_setup_called = true;774        if (!tests.promise_tests) {775            tests.promise_tests = Promise.resolve();776        }777        tests.promise_tests = tests.promise_tests778            .then(function()779                  {780                      var properties = maybe_properties || {};781                      var result;782                      tests.setup(null, properties);783                      result = func();784                      test_environment.on_new_harness_properties(properties);785                      if (!result || typeof result.then !== "function") {786                          throw "Non-thenable returned by function passed to `promise_setup`";787                      }788                      return result;789                  })790            .catch(function(e)791                   {792                       tests.set_status(tests.status.ERROR,793                                        String(e),794                                        e && e.stack);795                       tests.complete();796                   });797    }798    function done() {799        if (tests.tests.length === 0) {800            // `done` is invoked after handling uncaught exceptions, so if the801            // harness status is already set, the corresponding message is more802            // descriptive than the generic message defined here.803            if (tests.status.status === null) {804                tests.status.status = tests.status.ERROR;805                tests.status.message = "done() was called without first defining any tests";806            }807            tests.complete();808            return;809        }810        if (tests.file_is_test) {811            // file is test files never have asynchronous cleanup logic,812            // meaning the fully-synchronous `done` function can be used here.813            tests.tests[0].done();814        }815        tests.end_wait();816    }817    function generate_tests(func, args, properties) {818        forEach(args, function(x, i)819                {820                    var name = x[0];821                    test(function()822                         {823                             func.apply(this, x.slice(1));824                         },825                         name,826                         Array.isArray(properties) ? properties[i] : properties);827                });828    }829    /*830     * Register a function as a DOM event listener to the given object for the831     * event bubbling phase.832     *833     * This function was deprecated in November of 2019.834     */835    function on_event(object, event, callback)836    {837        object.addEventListener(event, callback, false);838    }839    function step_timeout(f, t) {840        var outer_this = this;841        var args = Array.prototype.slice.call(arguments, 2);842        return setTimeout(function() {843            f.apply(outer_this, args);844        }, t * tests.timeout_multiplier);845    }846    expose(test, 'test');847    expose(async_test, 'async_test');848    expose(promise_test, 'promise_test');849    expose(promise_rejects_js, 'promise_rejects_js');850    expose(promise_rejects_dom, 'promise_rejects_dom');851    expose(promise_rejects_exactly, 'promise_rejects_exactly');852    expose(generate_tests, 'generate_tests');853    expose(setup, 'setup');854    expose(promise_setup, 'promise_setup');855    expose(done, 'done');856    expose(on_event, 'on_event');857    expose(step_timeout, 'step_timeout');858    /*859     * Return a string truncated to the given length, with ... added at the end860     * if it was longer.861     */862    function truncate(s, len)863    {864        if (s.length > len) {865            return s.substring(0, len - 3) + "...";866        }867        return s;868    }869    /*870     * Return true if object is probably a Node object.871     */872    function is_node(object)873    {874        // I use duck-typing instead of instanceof, because875        // instanceof doesn't work if the node is from another window (like an876        // iframe's contentWindow):877        // http://www.w3.org/Bugs/Public/show_bug.cgi?id=12295878        try {879            var has_node_properties = ("nodeType" in object &&880                                       "nodeName" in object &&881                                       "nodeValue" in object &&882                                       "childNodes" in object);883        } catch (e) {884            // We're probably cross-origin, which means we aren't a node885            return false;886        }887        if (has_node_properties) {888            try {889                object.nodeType;890            } catch (e) {891                // The object is probably Node.prototype or another prototype892                // object that inherits from it, and not a Node instance.893                return false;894            }895            return true;896        }897        return false;898    }899    var replacements = {900        "0": "0",901        "1": "x01",902        "2": "x02",903        "3": "x03",904        "4": "x04",905        "5": "x05",906        "6": "x06",907        "7": "x07",908        "8": "b",909        "9": "t",910        "10": "n",911        "11": "v",912        "12": "f",913        "13": "r",914        "14": "x0e",915        "15": "x0f",916        "16": "x10",917        "17": "x11",918        "18": "x12",919        "19": "x13",920        "20": "x14",921        "21": "x15",922        "22": "x16",923        "23": "x17",924        "24": "x18",925        "25": "x19",926        "26": "x1a",927        "27": "x1b",928        "28": "x1c",929        "29": "x1d",930        "30": "x1e",931        "31": "x1f",932        "0xfffd": "ufffd",933        "0xfffe": "ufffe",934        "0xffff": "uffff",935    };936    /*937     * Convert a value to a nice, human-readable string938     */939    function format_value(val, seen)940    {941        if (!seen) {942            seen = [];943        }944        if (typeof val === "object" && val !== null) {945            if (seen.indexOf(val) >= 0) {946                return "[...]";947            }948            seen.push(val);949        }950        if (Array.isArray(val)) {951            let output = "[";952            if (val.beginEllipsis !== undefined) {953                output += "â¦, ";954            }955            output += val.map(function(x) {return format_value(x, seen);}).join(", ");956            if (val.endEllipsis !== undefined) {957                output += ", â¦";958            }959            return output + "]";960        }961        switch (typeof val) {962        case "string":963            val = val.replace(/\\/g, "\\\\");964            for (var p in replacements) {965                var replace = "\\" + replacements[p];966                val = val.replace(RegExp(String.fromCharCode(p), "g"), replace);967            }968            return '"' + val.replace(/"/g, '\\"') + '"';969        case "boolean":970        case "undefined":971            return String(val);972        case "number":973            // In JavaScript, -0 === 0 and String(-0) == "0", so we have to974            // special-case.975            if (val === -0 && 1/val === -Infinity) {976                return "-0";977            }978            return String(val);979        case "object":980            if (val === null) {981                return "null";982            }983            // Special-case Node objects, since those come up a lot in my tests.  I984            // ignore namespaces.985            if (is_node(val)) {986                switch (val.nodeType) {987                case Node.ELEMENT_NODE:988                    var ret = "<" + val.localName;989                    for (var i = 0; i < val.attributes.length; i++) {990                        ret += " " + val.attributes[i].name + '="' + val.attributes[i].value + '"';991                    }992                    ret += ">" + val.innerHTML + "</" + val.localName + ">";993                    return "Element node " + truncate(ret, 60);994                case Node.TEXT_NODE:995                    return 'Text node "' + truncate(val.data, 60) + '"';996                case Node.PROCESSING_INSTRUCTION_NODE:997                    return "ProcessingInstruction node with target " + format_value(truncate(val.target, 60)) + " and data " + format_value(truncate(val.data, 60));998                case Node.COMMENT_NODE:999                    return "Comment node <!--" + truncate(val.data, 60) + "-->";1000                case Node.DOCUMENT_NODE:1001                    return "Document node with " + val.childNodes.length + (val.childNodes.length == 1 ? " child" : " children");1002                case Node.DOCUMENT_TYPE_NODE:1003                    return "DocumentType node";1004                case Node.DOCUMENT_FRAGMENT_NODE:1005                    return "DocumentFragment node with " + val.childNodes.length + (val.childNodes.length == 1 ? " child" : " children");1006                default:1007                    return "Node object of unknown type";1008                }1009            }1010        /* falls through */1011        default:1012            try {1013                return typeof val + ' "' + truncate(String(val), 1000) + '"';1014            } catch(e) {1015                return ("[stringifying object threw " + String(e) +1016                        " with type " + String(typeof e) + "]");1017            }1018        }1019    }1020    expose(format_value, "format_value");1021    /*1022     * Assertions1023     */1024    function assert_true(actual, description)1025    {1026        assert(actual === true, "assert_true", description,1027                                "expected true got ${actual}", {actual:actual});1028    }1029    expose(assert_true, "assert_true");1030    function assert_false(actual, description)1031    {1032        assert(actual === false, "assert_false", description,1033                                 "expected false got ${actual}", {actual:actual});1034    }1035    expose(assert_false, "assert_false");1036    function same_value(x, y) {1037        if (y !== y) {1038            //NaN case1039            return x !== x;1040        }1041        if (x === 0 && y === 0) {1042            //Distinguish +0 and -01043            return 1/x === 1/y;1044        }1045        return x === y;1046    }1047    function assert_equals(actual, expected, description)1048    {1049         /*1050          * Test if two primitives are equal or two objects1051          * are the same object1052          */1053        if (typeof actual != typeof expected) {1054            assert(false, "assert_equals", description,1055                          "expected (" + typeof expected + ") ${expected} but got (" + typeof actual + ") ${actual}",1056                          {expected:expected, actual:actual});1057            return;1058        }1059        assert(same_value(actual, expected), "assert_equals", description,1060                                             "expected ${expected} but got ${actual}",1061                                             {expected:expected, actual:actual});1062    }1063    expose(assert_equals, "assert_equals");1064    function assert_not_equals(actual, expected, description)1065    {1066         /*1067          * Test if two primitives are unequal or two objects1068          * are different objects1069          */1070        assert(!same_value(actual, expected), "assert_not_equals", description,1071                                              "got disallowed value ${actual}",1072                                              {actual:actual});1073    }1074    expose(assert_not_equals, "assert_not_equals");1075    function assert_in_array(actual, expected, description)1076    {1077        assert(expected.indexOf(actual) != -1, "assert_in_array", description,1078                                               "value ${actual} not in array ${expected}",1079                                               {actual:actual, expected:expected});1080    }1081    expose(assert_in_array, "assert_in_array");1082    // This function was deprecated in July of 2015.1083    // See https://github.com/web-platform-tests/wpt/issues/20331084    function assert_object_equals(actual, expected, description)1085    {1086         assert(typeof actual === "object" && actual !== null, "assert_object_equals", description,1087                                                               "value is ${actual}, expected object",1088                                                               {actual: actual});1089         //This needs to be improved a great deal1090         function check_equal(actual, expected, stack)1091         {1092             stack.push(actual);1093             var p;1094             for (p in actual) {1095                 assert(expected.hasOwnProperty(p), "assert_object_equals", description,1096                                                    "unexpected property ${p}", {p:p});1097                 if (typeof actual[p] === "object" && actual[p] !== null) {1098                     if (stack.indexOf(actual[p]) === -1) {1099                         check_equal(actual[p], expected[p], stack);1100                     }1101                 } else {1102                     assert(same_value(actual[p], expected[p]), "assert_object_equals", description,1103                                                       "property ${p} expected ${expected} got ${actual}",1104                                                       {p:p, expected:expected[p], actual:actual[p]});1105                 }1106             }1107             for (p in expected) {1108                 assert(actual.hasOwnProperty(p),1109                        "assert_object_equals", description,1110                        "expected property ${p} missing", {p:p});1111             }1112             stack.pop();1113         }1114         check_equal(actual, expected, []);1115    }1116    expose(assert_object_equals, "assert_object_equals");1117    function assert_array_equals(actual, expected, description)1118    {1119        const max_array_length = 20;1120        function shorten_array(arr, offset = 0) {1121            // Make ", â¦" only show up when it would likely reduce the length, not accounting for1122            // fonts.1123            if (arr.length < max_array_length + 2) {1124                return arr;1125            }1126            // By default we want half the elements after the offset and half before1127            // But if that takes us past the end of the array, we have more before, and1128            // if it takes us before the start we have more after.1129            const length_after_offset = Math.floor(max_array_length / 2);1130            let upper_bound = Math.min(length_after_offset + offset, arr.length);1131            const lower_bound = Math.max(upper_bound - max_array_length, 0);1132            if (lower_bound === 0) {1133                upper_bound = max_array_length;1134            }1135            const output = arr.slice(lower_bound, upper_bound);1136            if (lower_bound > 0) {1137                output.beginEllipsis = true;1138            }1139            if (upper_bound < arr.length) {1140                output.endEllipsis = true;1141            }1142            return output;1143        }1144        assert(typeof actual === "object" && actual !== null && "length" in actual,1145               "assert_array_equals", description,1146               "value is ${actual}, expected array",1147               {actual:actual});1148        assert(actual.length === expected.length,1149               "assert_array_equals", description,1150               "lengths differ, expected array ${expected} length ${expectedLength}, got ${actual} length ${actualLength}",1151               {expected:shorten_array(expected, expected.length - 1), expectedLength:expected.length,1152                actual:shorten_array(actual, actual.length - 1), actualLength:actual.length1153               });1154        for (var i = 0; i < actual.length; i++) {1155            assert(actual.hasOwnProperty(i) === expected.hasOwnProperty(i),1156                   "assert_array_equals", description,1157                   "expected property ${i} to be ${expected} but was ${actual} (expected array ${arrayExpected} got ${arrayActual})",1158                   {i:i, expected:expected.hasOwnProperty(i) ? "present" : "missing",1159                    actual:actual.hasOwnProperty(i) ? "present" : "missing",1160                    arrayExpected:shorten_array(expected, i), arrayActual:shorten_array(actual, i)});1161            assert(same_value(expected[i], actual[i]),1162                   "assert_array_equals", description,1163                   "expected property ${i} to be ${expected} but got ${actual} (expected array ${arrayExpected} got ${arrayActual})",1164                   {i:i, expected:expected[i], actual:actual[i],1165                    arrayExpected:shorten_array(expected, i), arrayActual:shorten_array(actual, i)});1166        }1167    }1168    expose(assert_array_equals, "assert_array_equals");1169    function assert_array_approx_equals(actual, expected, epsilon, description)1170    {1171        /*1172         * Test if two primitive arrays are equal within +/- epsilon1173         */1174        assert(actual.length === expected.length,1175               "assert_array_approx_equals", description,1176               "lengths differ, expected ${expected} got ${actual}",1177               {expected:expected.length, actual:actual.length});1178        for (var i = 0; i < actual.length; i++) {1179            assert(actual.hasOwnProperty(i) === expected.hasOwnProperty(i),1180                   "assert_array_approx_equals", description,1181                   "property ${i}, property expected to be ${expected} but was ${actual}",1182                   {i:i, expected:expected.hasOwnProperty(i) ? "present" : "missing",1183                    actual:actual.hasOwnProperty(i) ? "present" : "missing"});1184            assert(typeof actual[i] === "number",1185                   "assert_array_approx_equals", description,1186                   "property ${i}, expected a number but got a ${type_actual}",1187                   {i:i, type_actual:typeof actual[i]});1188            assert(Math.abs(actual[i] - expected[i]) <= epsilon,1189                   "assert_array_approx_equals", description,1190                   "property ${i}, expected ${expected} +/- ${epsilon}, expected ${expected} but got ${actual}",1191                   {i:i, expected:expected[i], actual:actual[i], epsilon:epsilon});1192        }1193    }1194    expose(assert_array_approx_equals, "assert_array_approx_equals");1195    function assert_approx_equals(actual, expected, epsilon, description)1196    {1197        /*1198         * Test if two primitive numbers are equal within +/- epsilon1199         */1200        assert(typeof actual === "number",1201               "assert_approx_equals", description,1202               "expected a number but got a ${type_actual}",1203               {type_actual:typeof actual});1204        assert(Math.abs(actual - expected) <= epsilon,1205               "assert_approx_equals", description,1206               "expected ${expected} +/- ${epsilon} but got ${actual}",1207               {expected:expected, actual:actual, epsilon:epsilon});1208    }1209    expose(assert_approx_equals, "assert_approx_equals");1210    function assert_less_than(actual, expected, description)1211    {1212        /*1213         * Test if a primitive number is less than another1214         */1215        assert(typeof actual === "number",1216               "assert_less_than", description,1217               "expected a number but got a ${type_actual}",1218               {type_actual:typeof actual});1219        assert(actual < expected,1220               "assert_less_than", description,1221               "expected a number less than ${expected} but got ${actual}",1222               {expected:expected, actual:actual});1223    }1224    expose(assert_less_than, "assert_less_than");1225    function assert_greater_than(actual, expected, description)1226    {1227        /*1228         * Test if a primitive number is greater than another1229         */1230        assert(typeof actual === "number",1231               "assert_greater_than", description,1232               "expected a number but got a ${type_actual}",1233               {type_actual:typeof actual});1234        assert(actual > expected,1235               "assert_greater_than", description,1236               "expected a number greater than ${expected} but got ${actual}",1237               {expected:expected, actual:actual});1238    }1239    expose(assert_greater_than, "assert_greater_than");1240    function assert_between_exclusive(actual, lower, upper, description)1241    {1242        /*1243         * Test if a primitive number is between two others1244         */1245        assert(typeof actual === "number",1246               "assert_between_exclusive", description,1247               "expected a number but got a ${type_actual}",1248               {type_actual:typeof actual});1249        assert(actual > lower && actual < upper,1250               "assert_between_exclusive", description,1251               "expected a number greater than ${lower} " +1252               "and less than ${upper} but got ${actual}",1253               {lower:lower, upper:upper, actual:actual});1254    }1255    expose(assert_between_exclusive, "assert_between_exclusive");1256    function assert_less_than_equal(actual, expected, description)1257    {1258        /*1259         * Test if a primitive number is less than or equal to another1260         */1261        assert(typeof actual === "number",1262               "assert_less_than_equal", description,1263               "expected a number but got a ${type_actual}",1264               {type_actual:typeof actual});1265        assert(actual <= expected,1266               "assert_less_than_equal", description,1267               "expected a number less than or equal to ${expected} but got ${actual}",1268               {expected:expected, actual:actual});1269    }1270    expose(assert_less_than_equal, "assert_less_than_equal");1271    function assert_greater_than_equal(actual, expected, description)1272    {1273        /*1274         * Test if a primitive number is greater than or equal to another1275         */1276        assert(typeof actual === "number",1277               "assert_greater_than_equal", description,1278               "expected a number but got a ${type_actual}",1279               {type_actual:typeof actual});1280        assert(actual >= expected,1281               "assert_greater_than_equal", description,1282               "expected a number greater than or equal to ${expected} but got ${actual}",1283               {expected:expected, actual:actual});1284    }1285    expose(assert_greater_than_equal, "assert_greater_than_equal");1286    function assert_between_inclusive(actual, lower, upper, description)1287    {1288        /*1289         * Test if a primitive number is between to two others or equal to either of them1290         */1291        assert(typeof actual === "number",1292               "assert_between_inclusive", description,1293               "expected a number but got a ${type_actual}",1294               {type_actual:typeof actual});1295        assert(actual >= lower && actual <= upper,1296               "assert_between_inclusive", description,1297               "expected a number greater than or equal to ${lower} " +1298               "and less than or equal to ${upper} but got ${actual}",1299               {lower:lower, upper:upper, actual:actual});1300    }1301    expose(assert_between_inclusive, "assert_between_inclusive");1302    function assert_regexp_match(actual, expected, description) {1303        /*1304         * Test if a string (actual) matches a regexp (expected)1305         */1306        assert(expected.test(actual),1307               "assert_regexp_match", description,1308               "expected ${expected} but got ${actual}",1309               {expected:expected, actual:actual});1310    }1311    expose(assert_regexp_match, "assert_regexp_match");1312    function assert_class_string(object, class_string, description) {1313        var actual = {}.toString.call(object);1314        var expected = "[object " + class_string + "]";1315        assert(same_value(actual, expected), "assert_class_string", description,1316                                             "expected ${expected} but got ${actual}",1317                                             {expected:expected, actual:actual});1318    }1319    expose(assert_class_string, "assert_class_string");1320    function assert_own_property(object, property_name, description) {1321        assert(object.hasOwnProperty(property_name),1322               "assert_own_property", description,1323               "expected property ${p} missing", {p:property_name});1324    }1325    expose(assert_own_property, "assert_own_property");1326    function assert_not_own_property(object, property_name, description) {1327        assert(!object.hasOwnProperty(property_name),1328               "assert_not_own_property", description,1329               "unexpected property ${p} is found on object", {p:property_name});1330    }1331    expose(assert_not_own_property, "assert_not_own_property");1332    function _assert_inherits(name) {1333        return function (object, property_name, description)1334        {1335            assert(typeof object === "object" || typeof object === "function" ||1336                   // Or has [[IsHTMLDDA]] slot1337                   String(object) === "[object HTMLAllCollection]",1338                   name, description,1339                   "provided value is not an object");1340            assert("hasOwnProperty" in object,1341                   name, description,1342                   "provided value is an object but has no hasOwnProperty method");1343            assert(!object.hasOwnProperty(property_name),1344                   name, description,1345                   "property ${p} found on object expected in prototype chain",1346                   {p:property_name});1347            assert(property_name in object,1348                   name, description,1349                   "property ${p} not found in prototype chain",1350                   {p:property_name});1351        };1352    }1353    expose(_assert_inherits("assert_inherits"), "assert_inherits");1354    expose(_assert_inherits("assert_idl_attribute"), "assert_idl_attribute");1355    function assert_readonly(object, property_name, description)1356    {1357         var initial_value = object[property_name];1358         try {1359             //Note that this can have side effects in the case where1360             //the property has PutForwards1361             object[property_name] = initial_value + "a"; //XXX use some other value here?1362             assert(same_value(object[property_name], initial_value),1363                    "assert_readonly", description,1364                    "changing property ${p} succeeded",1365                    {p:property_name});1366         } finally {1367             object[property_name] = initial_value;1368         }1369    }1370    expose(assert_readonly, "assert_readonly");1371    /**1372     * Assert a JS Error with the expected constructor is thrown.1373     *1374     * @param {object} constructor The expected exception constructor.1375     * @param {Function} func Function which should throw.1376     * @param {string} description Error description for the case that the error is not thrown.1377     */1378    function assert_throws_js(constructor, func, description)1379    {1380        assert_throws_js_impl(constructor, func, description,1381                              "assert_throws_js");1382    }1383    expose(assert_throws_js, "assert_throws_js");1384    /**1385     * Like assert_throws_js but allows specifying the assertion type1386     * (assert_throws_js or promise_rejects_js, in practice).1387     */1388    function assert_throws_js_impl(constructor, func, description,1389                                   assertion_type)1390    {1391        try {1392            func.call(this);1393            assert(false, assertion_type, description,1394                   "${func} did not throw", {func:func});1395        } catch (e) {1396            if (e instanceof AssertionError) {1397                throw e;1398            }1399            // Basic sanity-checks on the thrown exception.1400            assert(typeof e === "object",1401                   assertion_type, description,1402                   "${func} threw ${e} with type ${type}, not an object",...

assert.js

Source:assert.js

...138        substitute_children(template.slice(2), rv);139    }140    return rv;141}142export function assert_throws_js_impl(constructor, func, description, assertion_type) {143    try {144        func.call(this);145        assert.fail(make_message(assertion_type, description, '${func} did not throw', { func: func }));146    } catch (e) {147        if (e instanceof AssertionError) {148            throw e;149        }150        // Basic sanity-checks on the thrown exception.151        assert(typeof e === 'object', make_message(152            assertion_type,153            description,154            '${func} threw ${e} with type ${type}, not an object',155            { func: func, e: e, type: typeof e }156        ));157        assert(e !== null, make_message(assertion_type, description, '${func} threw null, not an object', { func: func }));158        // Basic sanity-check on the passed-in constructor159        assert(typeof constructor === 'function', make_message(160            assertion_type,161            description,162            '${constructor} is not a constructor',163            { constructor: constructor }164        ));165        let obj = constructor;166        while (obj) {167            if (typeof obj === 'function' && obj.name === 'Error') {168                break;169            }170            obj = Object.getPrototypeOf(obj);171        }172        assert(obj != null, make_message(173            assertion_type,174            description,175            '${constructor} is not an Error subtype',176            { constructor: constructor }));177        // And checking that our exception is reasonable178        assert(e.constructor === constructor && e.name === constructor.name, make_message(179            assertion_type, description,180            '${func} threw ${actual} (${actual_name}) expected instance of ${expected} (${expected_name})',181            {182                func: func,183                actual: e,184                actual_name: e.name,185                expected: constructor,186                expected_name: constructor.name187            }188        ));189    }190}191export function assert_throws_js(constructor, func, description) {192    assert_throws_js_impl(constructor, func, description, 'assert_throws_js');193}194export function promise_rejects_js(test, constructor, promise, description) {195    return bring_promise_to_current_realm(promise)196        .then(unreached_func('Should have rejected: ' + description))197        .catch(function (e) {198            assert_throws_js_impl(constructor, function () { throw e; },199                description, 'promise_rejects_js');200        });201}202export function step_timeout(f, t) {203    const outer_this = this;204    const args = Array.prototype.slice.call(arguments, 2);205    return setTimeout(function () {206        f.apply(outer_this, args);207    }, t);208}209export function promise_rejects_exactly(test, exception, promise, description) {210    return bring_promise_to_current_realm(promise)211        .then(unreached_func('Should have rejected: ' + description))212        .catch(function (e) {...

wpthelp.mjs

Source:wpthelp.mjs

...90  }91};92global.done = function () {};93global.assert_throws_js = function (constructor, func, description) {94  // assert_throws_js_impl(constructor, func, description, "assert_throws_js");95  (current_t || tap).throws(96    func,97    constructor,98    description99    //  [100    //   constructor,101    //   "assert_throws_js",102    // ]103  );104};105global.async_test = function (func, name, properties) {106  return {107    done: function () {},108  };...

Using AI Code Generation

1const assert_throws_js_impl = (expected, func, message) => {2    let caught = false;3    try {4        func();5    } catch (e) {6        caught = true;7        assert_equals(e.constructor.name, expected.name, message);8    }9    assert_true(caught, message);10};11const assert_throws_dom = (expected, func, message) => {12    let caught = false;13    try {14        func();15    } catch (e) {16        caught = true;17        assert_equals(e.name, expected, message);18    }19    assert_true(caught, message);20};21test(() => {22    assert_throws_js_impl(TypeError, () => {23        new EventTarget();24    }, "EventTarget constructor should throw TypeError");25}, "EventTarget constructor should throw TypeError");26test(() => {27    assert_throws_dom("TypeError", () => {28        new EventTarget();29    }, "EventTarget constructor should throw TypeError");30}, "EventTarget constructor should throw TypeError");31test(() => {32    assert_throws_js_impl(TypeError, () => {33        new EventTarget("test");34    }, "EventTarget constructor should throw TypeError");35}, "EventTarget constructor should throw TypeError");36test(() => {37    assert_throws_dom("TypeError", () => {38        new EventTarget("test");39    }, "EventTarget constructor should throw TypeError");40}, "EventTarget constructor should throw TypeError");41test(() => {42    assert_throws_js_impl(TypeError, () => {43        new EventTarget(null);44    }, "EventTarget constructor should throw TypeError");45}, "EventTarget constructor should throw TypeError");46test(() => {47    assert_throws_dom("TypeError", () => {48        new EventTarget(null);49    }, "EventTarget constructor should throw TypeError");50}, "EventTarget constructor should throw TypeError");51test(() => {52    assert_throws_js_impl(TypeError, () => {53        new EventTarget(undefined);54    }, "EventTarget constructor should throw TypeError");55}, "EventTarget constructor should throw TypeError");56test(() => {57    assert_throws_dom("TypeError", () => {58        new EventTarget(undefined);59    }, "EventTarget constructor should throw TypeError");60}, "EventTarget constructor should throw TypeError");61test(() => {62    assert_throws_js_impl(TypeError, () => {63        new EventTarget(1);64    }, "EventTarget constructor should throw TypeError");65}, "

Using AI Code Generation

1test(function() {2  assert_throws_js_impl(3    function() {4      throw new Error("Error message");5    },6  );7}, "Test assert_throws_js_impl method");

Using AI Code Generation

1test(()=> {2  assert_throws_js_impl('TypeError', () => {3    throw new TypeError();4  });5});6function assert_throws_js_impl(errorType, func) {7  let error;8  try {9    func();10  } catch (e) {11    error = e;12  }13  if (error) {14    assert_true(error instanceof errorType, 'Error thrown is not of type ' + errorType.name);15  } else {16    assert_unreached('No error was thrown');17  }18}

Using AI Code Generation

1function test() {2  assert_throws_js_impl(3    () => {4      throw new Error("test");5    },6  );7}8function test() {9  assert_throws_dom_impl(10    () => {11      throw new DOMException("test", "test");12    },13  );14}15function test() {16  assert_throws_dom_impl(17    () => {18      throw new DOMException("test", "test");19    },20  );21}22function test() {23  assert_throws_dom_impl(24    () => {25      throw new DOMException("test", "test");26    },27  );28}29function test() {30  assert_throws_dom_impl(31    () => {32      throw new DOMException("test", "test");33    },34  );35}36function test() {37  assert_throws_dom_impl(38    () => {39      throw new DOMException("test", "test");40    },41  );42}43function test() {44  assert_throws_dom_impl(45    () => {46      throw new DOMException("test", "test");47    },48  );49}50function test() {51  assert_throws_dom_impl(52    () => {53      throw new DOMException("test", "test");54    },

Using AI Code Generation

1assert_throws_js_impl("TypeError", Math.max, [], "This should throw a TypeError");2assert_throws_dom_impl("InvalidStateError", function() {3    throw new DOMException("This should throw a InvalidStateError", "InvalidStateError");4});5assert_throws_impl("Error", function() {6    throw new Error("This should throw a Error");7});8assert_throws_impl("Error", function() {9    throw new Error("This should throw a Error");10});11assert_throws_impl("Error", function() {12    throw new Error("This should throw a Error");13});14assert_throws_impl("Error", function() {15    throw new Error("This should throw a Error");16});17assert_throws_impl("Error", function() {18    throw new Error("This should throw a Error");19});20assert_throws_impl("Error", function() {21    throw new Error("This should throw a Error");22});23assert_throws_impl("Error", function() {24    throw new Error("This should throw a Error");25});

Using AI Code Generation

1function test() {2 var x = 10;3 var y = 0;4 assert_throws_js_impl(function() {x/y;}, TypeError);5}6test();

Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.