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189 lines
6.4 KiB
JavaScript
189 lines
6.4 KiB
JavaScript
// META: global=worker,jsshell
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'use strict';
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// The purpose of this file is to test for objects, attributes and arguments that should not exist.
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// The test cases are generated from data tables to reduce duplication.
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// Courtesy of André Bargull. Source is https://esdiscuss.org/topic/isconstructor#content-11.
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function IsConstructor(o) {
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try {
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new new Proxy(o, { construct: () => ({}) })();
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return true;
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} catch (e) {
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return false;
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}
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}
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test(() => {
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assert_equals(self['TransformStreamDefaultController'], undefined,
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`TransformStreamDefaultController should not be defined`);
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}, `TransformStreamDefaultController should not be exported on the global object`);
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// Now get hold of the symbol so we can test its properties.
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self.TransformStreamDefaultController = (() => {
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let controller;
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new TransformStream({
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start(c) {
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controller = c;
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}
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});
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return controller.constructor;
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})();
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const expected = {
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TransformStream: {
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constructor: {
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type: 'constructor',
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length: 0
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},
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readable: {
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type: 'getter'
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},
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writable: {
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type: 'getter'
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}
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},
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TransformStreamDefaultController: {
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constructor: {
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type: 'constructor',
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length: 0
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},
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desiredSize: {
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type: 'getter'
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},
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enqueue: {
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type: 'method',
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length: 1
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},
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error: {
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type: 'method',
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length: 1
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},
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terminate: {
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type: 'method',
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length: 0
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}
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}
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};
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for (const c in expected) {
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const properties = expected[c];
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const prototype = self[c].prototype;
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for (const name in properties) {
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const fullName = `${c}.prototype.${name}`;
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const descriptor = Object.getOwnPropertyDescriptor(prototype, name);
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test(() => {
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const { configurable, enumerable } = descriptor;
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assert_true(configurable, `${name} should be configurable`);
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assert_false(enumerable, `${name} should not be enumerable`);
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}, `${fullName} should have standard properties`);
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const type = properties[name].type;
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switch (type) {
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case 'getter':
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test(() => {
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const { writable, get, set } = descriptor;
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assert_equals(writable, undefined, `${name} should not be a data descriptor`);
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assert_equals(typeof get, 'function', `${name} should have a getter`);
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assert_equals(set, undefined, `${name} should not have a setter`);
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}, `${fullName} should be a getter`);
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break;
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case 'constructor':
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case 'method':
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test(() => {
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assert_true(descriptor.writable, `${name} should be writable`);
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assert_equals(typeof prototype[name], 'function', `${name} should be a function`);
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assert_equals(prototype[name].length, properties[name].length,
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`${name} should take ${properties[name].length} arguments`);
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if (type === 'constructor') {
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assert_true(IsConstructor(prototype[name]), `${name} should be a constructor`);
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assert_equals(prototype[name].name, c, `${name}.name should be '${c}'`);
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} else {
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assert_false(IsConstructor(prototype[name]), `${name} should not be a constructor`);
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assert_equals(prototype[name].name, name, `${name}.name should be '${name}`);
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}
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}, `${fullName} should be a ${type}`);
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break;
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}
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}
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test(() => {
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const expectedPropertyNames = Object.keys(properties).sort();
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const actualPropertyNames = Object.getOwnPropertyNames(prototype).sort();
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assert_array_equals(actualPropertyNames, expectedPropertyNames,
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`${c} properties should match expected properties`);
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}, `${c}.prototype should have exactly the expected properties`);
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}
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const transformerMethods = {
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start: {
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length: 1,
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trigger: () => Promise.resolve()
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},
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transform: {
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length: 2,
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trigger: ts => ts.writable.getWriter().write()
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},
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flush: {
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length: 1,
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trigger: ts => ts.writable.getWriter().close()
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}
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};
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for (const method in transformerMethods) {
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const { length, trigger } = transformerMethods[method];
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// Some semantic tests of how transformer methods are called can be found in general.js, as well as in the test files
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// specific to each method.
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promise_test(() => {
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let argCount;
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const ts = new TransformStream({
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[method](...args) {
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argCount = args.length;
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}
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}, undefined, { highWaterMark: Infinity });
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return Promise.resolve(trigger(ts)).then(() => {
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assert_equals(argCount, length, `${method} should be called with ${length} arguments`);
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});
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}, `transformer method ${method} should be called with the right number of arguments`);
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promise_test(() => {
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let methodWasCalled = false;
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function Transformer() {}
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Transformer.prototype = {
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[method]() {
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methodWasCalled = true;
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}
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};
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const ts = new TransformStream(new Transformer(), undefined, { highWaterMark: Infinity });
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return Promise.resolve(trigger(ts)).then(() => {
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assert_true(methodWasCalled, `${method} should be called`);
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});
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}, `transformer method ${method} should be called even when it's located on the prototype chain`);
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promise_test(t => {
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const unreachedTraps = ['getPrototypeOf', 'setPrototypeOf', 'isExtensible', 'preventExtensions',
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'getOwnPropertyDescriptor', 'defineProperty', 'has', 'set', 'deleteProperty', 'ownKeys',
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'apply', 'construct'];
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const touchedProperties = [];
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const handler = {
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get: t.step_func((target, property) => {
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touchedProperties.push(property);
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if (property === 'readableType' || property === 'writableType') {
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return undefined;
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}
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return () => Promise.resolve();
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})
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};
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for (const trap of unreachedTraps) {
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handler[trap] = t.unreached_func(`${trap} should not be trapped`);
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}
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const transformer = new Proxy({}, handler);
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const ts = new TransformStream(transformer, undefined, { highWaterMark: Infinity });
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assert_array_equals(touchedProperties, ['writableType', 'readableType', 'transform', 'flush', 'start'],
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'expected properties should be got');
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return trigger(ts).then(() => {
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assert_array_equals(touchedProperties, ['writableType', 'readableType', 'transform', 'flush', 'start'],
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'no properties should be accessed on method call');
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});
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}, `unexpected properties should not be accessed when calling transformer method ${method}`);
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}
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