132 lines
3.8 KiB
JavaScript
132 lines
3.8 KiB
JavaScript
/**
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* Tests util.getPropertyDescriptor
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*
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* Copyright (C) 2014 Mike Gerwitz
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*
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* This file is part of GNU ease.js.
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*
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* ease.js is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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require( 'common' ).testCase(
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{
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caseSetUp: function()
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{
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this.Sut = this.require( 'util' );
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this.hasGetSet = !( this.Sut.definePropertyFallback() );
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},
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/**
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* If Object.getOwnPropertyDescriptor is provided by our environment, it
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* should be used by util; anything else we do is a workaround in the
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* event that this is missing.
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*/
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'Should use Object.getOwnPropertyDescriptor if available': function()
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{
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if ( !( this.hasGetSet && Object.getOwnPropertyDescriptor ) )
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{
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this.skip();
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}
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this.assertStrictEqual(
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this.Sut.getOwnPropertyDescriptor,
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Object.getOwnPropertyDescriptor
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);
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},
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/**
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* This function should provide a boolean value indicating whether it
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* can traverse the prototype chain
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*/
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'Indicates whether property chain traversal is possible': function()
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{
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var traversable = ( typeof Object.getPrototypeOf === 'function' );
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this.assertEqual(
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this.Sut.getPropertyDescriptor.canTraverse,
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traversable
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);
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},
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/**
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* We don't want tricksters to get funky with our system
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*/
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'Traversable property is non-writable': function()
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{
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if ( !( this.hasGetSet && Object.getOwnPropertyDescriptor ) )
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{
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this.skip();
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}
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this.assertEqual(
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Object.getOwnPropertyDescriptor(
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this.Sut.getPropertyDescriptor, 'canTraverse'
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).writable,
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false
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);
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},
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/**
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* The return value should mimic Object.getOwnPropertyDescriptor if
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* we're not having to traverse the prototype chain
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*/
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'Acts as ES5 getOwnPropertyDescriptor when one level deep': function()
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{
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var obj = { foo: 'bar' },
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desc1 = this.Sut.getOwnPropertyDescriptor( obj, 'foo' ),
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desc2 = this.Sut.getPropertyDescriptor( obj, 'foo' )
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;
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this.assertDeepEqual( desc1, desc2 );
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},
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/**
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* If we *do* have to start traversing the prototype chain (which
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* Object.getOwnPropertyDescriptor() cannot do), then it should be as if
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* we called Object.getOwnPropertyDescriptor() on the object in the
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* prototype chain containing the requested property.
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*/
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'Traverses the prototype chain when necessary': function()
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{
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if ( !( this.Sut.getPropertyDescriptor.canTraverse ) )
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{
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this.skip();
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}
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var proto = { foo: 'bar' },
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obj = function() {}
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;
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obj.prototype = proto;
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// to give ourselves the prototype chain (we don't want to set __proto__
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// because this test will also be run on pre-ES5 engines)
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var inst = new obj(),
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// get the actual descriptor
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expected = this.Sut.getOwnPropertyDescriptor( proto, 'foo' ),
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// attempt to gather the descriptor from the prototype chain
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given = this.Sut.getPropertyDescriptor( inst, 'foo' )
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;
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this.assertDeepEqual( given, expected );
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},
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} );
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