inherited-properties-omitted.js (1384B)
1 // Copyright (C) 2016 Jordan Harband. All rights reserved. 2 // This code is governed by the BSD license found in the LICENSE file. 3 4 /*--- 5 description: Object.getOwnPropertyDescriptors does not see inherited properties. 6 esid: sec-object.getownpropertydescriptors 7 author: Jordan Harband 8 ---*/ 9 10 var F = function() {}; 11 F.prototype.a = {}; 12 F.prototype.b = {}; 13 14 var f = new F(); 15 var bValue = {}; 16 f.b = bValue; // shadow the prototype 17 Object.defineProperty(f, 'c', { 18 enumerable: false, 19 configurable: true, 20 writable: false, 21 value: {} 22 }); // solely an own property 23 24 var result = Object.getOwnPropertyDescriptors(f); 25 26 assert.sameValue(!!result.b, true, 'b has a descriptor'); 27 assert.sameValue(!!result.c, true, 'c has a descriptor'); 28 29 assert.sameValue(result.b.enumerable, true, 'b is enumerable'); 30 assert.sameValue(result.b.configurable, true, 'b is configurable'); 31 assert.sameValue(result.b.writable, true, 'b is writable'); 32 assert.sameValue(result.b.value, bValue, 'b’s value is `bValue`'); 33 34 assert.sameValue(result.c.enumerable, false, 'c is enumerable'); 35 assert.sameValue(result.c.configurable, true, 'c is configurable'); 36 assert.sameValue(result.c.writable, false, 'c is writable'); 37 assert.sameValue(result.c.value, f.c, 'c’s value is `f.c`'); 38 39 assert.sameValue( 40 Object.keys(result).length, 41 2, 42 'result has same number of own property names as f' 43 ); 44 45 reportCompare(0, 0);