132 lines
3.8 KiB
JavaScript
132 lines
3.8 KiB
JavaScript
/**
|
|
* Tests util.getPropertyDescriptor
|
|
*
|
|
* Copyright (C) 2011, 2013 Mike Gerwitz
|
|
*
|
|
* This file is part of GNU ease.js.
|
|
*
|
|
* ease.js is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
require( 'common' ).testCase(
|
|
{
|
|
caseSetUp: function()
|
|
{
|
|
this.Sut = this.require( 'util' );
|
|
this.hasGetSet = !( this.Sut.definePropertyFallback() );
|
|
},
|
|
|
|
|
|
/**
|
|
* If Object.getOwnPropertyDescriptor is provided by our environment, it
|
|
* should be used by util; anything else we do is a workaround in the
|
|
* event that this is missing.
|
|
*/
|
|
'Should use Object.getOwnPropertyDescriptor if available': function()
|
|
{
|
|
if ( !( this.hasGetSet && Object.getOwnPropertyDescriptor ) )
|
|
{
|
|
this.skip();
|
|
}
|
|
|
|
this.assertStrictEqual(
|
|
this.Sut.getOwnPropertyDescriptor,
|
|
Object.getOwnPropertyDescriptor
|
|
);
|
|
},
|
|
|
|
|
|
/**
|
|
* This function should provide a boolean value indicating whether it
|
|
* can traverse the prototype chain
|
|
*/
|
|
'Indicates whether property chain traversal is possible': function()
|
|
{
|
|
var traversable = ( {}.__proto__ ) ? true : false;
|
|
|
|
this.assertEqual(
|
|
this.Sut.getPropertyDescriptor.canTraverse,
|
|
traversable
|
|
);
|
|
},
|
|
|
|
|
|
/**
|
|
* We don't want tricksters to get funky with our system
|
|
*/
|
|
'Traversable property is non-writable': function()
|
|
{
|
|
if ( !( this.hasGetSet && Object.getOwnPropertyDescriptor ) )
|
|
{
|
|
this.skip();
|
|
}
|
|
|
|
this.assertEqual(
|
|
Object.getOwnPropertyDescriptor(
|
|
this.Sut.getPropertyDescriptor, 'canTraverse'
|
|
).writable,
|
|
false
|
|
);
|
|
},
|
|
|
|
|
|
/**
|
|
* The return value should mimic Object.getOwnPropertyDescriptor if
|
|
* we're not having to traverse the prototype chain
|
|
*/
|
|
'Acts as ES5 getOwnPropertyDescriptor when one level deep': function()
|
|
{
|
|
var obj = { foo: 'bar' },
|
|
desc1 = this.Sut.getOwnPropertyDescriptor( obj, 'foo' ),
|
|
desc2 = this.Sut.getPropertyDescriptor( obj, 'foo' )
|
|
;
|
|
|
|
this.assertDeepEqual( desc1, desc2 );
|
|
},
|
|
|
|
|
|
/**
|
|
* If we *do* have to start traversing the prototype chain (which
|
|
* Object.getOwnPropertyDescriptor() cannot do), then it should be as if
|
|
* we called Object.getOwnPropertyDescriptor() on the object in the
|
|
* prototype chain containing the requested property.
|
|
*/
|
|
'Traverses the prototype chain when necessary': function()
|
|
{
|
|
if ( !( this.Sut.getPropertyDescriptor.canTraverse ) )
|
|
{
|
|
this.skip();
|
|
}
|
|
|
|
var proto = { foo: 'bar' },
|
|
obj = function() {}
|
|
;
|
|
|
|
obj.prototype = proto;
|
|
|
|
// to give ourselves the prototype chain (we don't want to set __proto__
|
|
// because this test will also be run on pre-ES5 engines)
|
|
var inst = new obj(),
|
|
|
|
// get the actual descriptor
|
|
expected = this.Sut.getOwnPropertyDescriptor( proto, 'foo' ),
|
|
|
|
// attempt to gather the descriptor from the prototype chain
|
|
given = this.Sut.getPropertyDescriptor( inst, 'foo' )
|
|
;
|
|
|
|
this.assertDeepEqual( given, expected );
|
|
},
|
|
} );
|