mirror of https://github.com/tc39/test262.git
124 lines
4.6 KiB
JavaScript
124 lines
4.6 KiB
JavaScript
// Copyright 2012 Mozilla Corporation. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/**
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* @description Tests that obj meets the requirements for built-in objects
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* defined by the introduction of chapter 15 of the ECMAScript Language Specification.
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* @param {Object} obj the object to be tested.
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* @param {boolean} isFunction whether the specification describes obj as a function.
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* @param {boolean} isConstructor whether the specification describes obj as a constructor.
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* @param {String[]} properties an array with the names of the built-in properties of obj,
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* excluding length, prototype, or properties with non-default attributes.
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* @param {number} length for functions only: the length specified for the function
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* or derived from the argument list.
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* @author Norbert Lindenberg
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*/
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function testBuiltInObject(obj, isFunction, isConstructor, properties, length) {
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if (obj === undefined) {
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$ERROR("Object being tested is undefined.");
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}
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var objString = Object.prototype.toString.call(obj);
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if (isFunction) {
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if (objString !== "[object Function]") {
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$ERROR("The [[Class]] internal property of a built-in function must be " +
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"\"Function\", but toString() returns " + objString);
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}
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} else {
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if (objString !== "[object Object]") {
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$ERROR("The [[Class]] internal property of a built-in non-function object must be " +
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"\"Object\", but toString() returns " + objString);
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}
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}
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if (!Object.isExtensible(obj)) {
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$ERROR("Built-in objects must be extensible.");
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}
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if (isFunction && Object.getPrototypeOf(obj) !== Function.prototype) {
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$ERROR("Built-in functions must have Function.prototype as their prototype.");
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}
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if (isConstructor && Object.getPrototypeOf(obj.prototype) !== Object.prototype) {
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$ERROR("Built-in prototype objects must have Object.prototype as their prototype.");
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}
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// verification of the absence of the [[Construct]] internal property has
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// been moved to the end of the test
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// verification of the absence of the prototype property has
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// been moved to the end of the test
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if (isFunction) {
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if (typeof obj.length !== "number" || obj.length !== Math.floor(obj.length)) {
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$ERROR("Built-in functions must have a length property with an integer value.");
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}
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if (obj.length !== length) {
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$ERROR("Function's length property doesn't have specified value; expected " +
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length + ", got " + obj.length + ".");
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}
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var desc = Object.getOwnPropertyDescriptor(obj, "length");
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if (desc.writable) {
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$ERROR("The length property of a built-in function must not be writable.");
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}
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if (desc.enumerable) {
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$ERROR("The length property of a built-in function must not be enumerable.");
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}
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if (!desc.configurable) {
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$ERROR("The length property of a built-in function must be configurable.");
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}
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}
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properties.forEach(function(prop) {
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var desc = Object.getOwnPropertyDescriptor(obj, prop);
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if (desc === undefined) {
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$ERROR("Missing property " + prop + ".");
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}
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// accessor properties don't have writable attribute
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if (desc.hasOwnProperty("writable") && !desc.writable) {
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$ERROR("The " + prop + " property of this built-in object must be writable.");
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}
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if (desc.enumerable) {
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$ERROR("The " + prop + " property of this built-in object must not be enumerable.");
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}
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if (!desc.configurable) {
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$ERROR("The " + prop + " property of this built-in object must be configurable.");
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}
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});
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// The remaining sections have been moved to the end of the test because
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// unbound non-constructor functions written in JavaScript cannot possibly
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// pass them, and we still want to test JavaScript implementations as much
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// as possible.
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var exception;
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if (isFunction && !isConstructor) {
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// this is not a complete test for the presence of [[Construct]]:
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// if it's absent, the exception must be thrown, but it may also
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// be thrown if it's present and just has preconditions related to
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// arguments or the this value that this statement doesn't meet.
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try {
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/*jshint newcap:false*/
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var instance = new obj();
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} catch (e) {
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exception = e;
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}
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if (exception === undefined || exception.name !== "TypeError") {
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$ERROR("Built-in functions that aren't constructors must throw TypeError when " +
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"used in a \"new\" statement.");
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}
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}
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if (isFunction && !isConstructor && obj.hasOwnProperty("prototype")) {
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$ERROR("Built-in functions that aren't constructors must not have a prototype property.");
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}
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// passed the complete test!
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return true;
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}
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