1// Copyright 2010 the V8 project authors. All rights reserved. 2// Redistribution and use in source and binary forms, with or without 3// modification, are permitted provided that the following conditions are 4// met: 5// 6// * Redistributions of source code must retain the above copyright 7// notice, this list of conditions and the following disclaimer. 8// * Redistributions in binary form must reproduce the above 9// copyright notice, this list of conditions and the following 10// disclaimer in the documentation and/or other materials provided 11// with the distribution. 12// * Neither the name of Google Inc. nor the names of its 13// contributors may be used to endorse or promote products derived 14// from this software without specific prior written permission. 15// 16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28// Tests the Object.seal and Object.isSealed methods - ES 15.2.3.9 and 29// ES 15.2.3.12 30 31 32// Test that we throw an error if an object is not passed as argument. 33var non_objects = new Array(undefined, null, 1, -1, 0, 42.43); 34for (var key in non_objects) { 35 try { 36 Object.seal(non_objects[key]); 37 assertUnreachable(); 38 } catch(e) { 39 assertTrue(/Object.seal called on non-object/.test(e)); 40 } 41} 42 43for (var key in non_objects) { 44 try { 45 Object.isSealed(non_objects[key]); 46 assertUnreachable(); 47 } catch(e) { 48 assertTrue(/Object.isSealed called on non-object/.test(e)); 49 } 50} 51 52// Test normal data properties. 53var obj = { x: 42, z: 'foobar' }; 54var desc = Object.getOwnPropertyDescriptor(obj, 'x'); 55assertTrue(desc.writable); 56assertTrue(desc.configurable); 57assertEquals(42, desc.value); 58 59desc = Object.getOwnPropertyDescriptor(obj, 'z'); 60assertTrue(desc.writable); 61assertTrue(desc.configurable); 62assertEquals('foobar', desc.value); 63 64assertTrue(Object.isExtensible(obj)); 65assertFalse(Object.isSealed(obj)); 66 67Object.seal(obj); 68 69// Make sure we are no longer extensible. 70assertFalse(Object.isExtensible(obj)); 71assertTrue(Object.isSealed(obj)); 72 73// We should not be frozen, since we are still able to 74// update values. 75assertFalse(Object.isFrozen(obj)); 76 77// We should not allow new properties to be added. 78obj.foo = 42; 79assertEquals(obj.foo, undefined); 80 81desc = Object.getOwnPropertyDescriptor(obj, 'x'); 82assertTrue(desc.writable); 83assertFalse(desc.configurable); 84assertEquals(42, desc.value); 85 86desc = Object.getOwnPropertyDescriptor(obj, 'z'); 87assertTrue(desc.writable); 88assertFalse(desc.configurable); 89assertEquals("foobar", desc.value); 90 91// Since writable is not affected by seal we should still be able to 92// update the values. 93obj.x = "43"; 94assertEquals(43, obj.x); 95 96// Test on accessors. 97var obj2 = {}; 98function get() { return 43; }; 99function set() {}; 100Object.defineProperty(obj2, 'x', { get: get, set: set, configurable: true }); 101 102desc = Object.getOwnPropertyDescriptor(obj2, 'x'); 103assertTrue(desc.configurable); 104assertEquals(undefined, desc.value); 105assertEquals(set, desc.set); 106assertEquals(get, desc.get); 107 108assertTrue(Object.isExtensible(obj2)); 109assertFalse(Object.isSealed(obj2)); 110Object.seal(obj2); 111 112// Since this is an accessor property the object is now effectively both 113// sealed and frozen (accessors has no writable attribute). 114assertTrue(Object.isFrozen(obj2)); 115assertFalse(Object.isExtensible(obj2)); 116assertTrue(Object.isSealed(obj2)); 117 118desc = Object.getOwnPropertyDescriptor(obj2, 'x'); 119assertFalse(desc.configurable); 120assertEquals(undefined, desc.value); 121assertEquals(set, desc.set); 122assertEquals(get, desc.get); 123 124obj2.foo = 42; 125assertEquals(obj2.foo, undefined); 126 127// Test seal on arrays. 128var arr = new Array(42,43); 129 130desc = Object.getOwnPropertyDescriptor(arr, '0'); 131assertTrue(desc.configurable); 132assertTrue(desc.writable); 133assertEquals(42, desc.value); 134 135desc = Object.getOwnPropertyDescriptor(arr, '1'); 136assertTrue(desc.configurable); 137assertTrue(desc.writable); 138assertEquals(43, desc.value); 139 140assertTrue(Object.isExtensible(arr)); 141assertFalse(Object.isSealed(arr)); 142Object.seal(arr); 143assertTrue(Object.isSealed(arr)); 144assertFalse(Object.isExtensible(arr)); 145// Since the values in the array is still writable this object 146// is not frozen. 147assertFalse(Object.isFrozen(arr)); 148 149desc = Object.getOwnPropertyDescriptor(arr, '0'); 150assertFalse(desc.configurable); 151assertTrue(desc.writable); 152assertEquals(42, desc.value); 153 154desc = Object.getOwnPropertyDescriptor(arr, '1'); 155assertFalse(desc.configurable); 156assertTrue(desc.writable); 157assertEquals(43, desc.value); 158 159arr[0] = 'foo'; 160 161// We should be able to overwrite the existing value. 162assertEquals('foo', arr[0]); 163 164 165// Test that isSealed returns the correct value even if configurable 166// has been set to false on all properties manually and the extensible 167// flag has also been set to false manually. 168var obj3 = { x: 42, y: 'foo' }; 169 170assertFalse(Object.isFrozen(obj3)); 171 172Object.defineProperty(obj3, 'x', {configurable: false, writable: true}); 173Object.defineProperty(obj3, 'y', {configurable: false, writable: false}); 174Object.preventExtensions(obj3); 175 176assertTrue(Object.isSealed(obj3)); 177 178 179// Make sure that an object that has a configurable property 180// is not classified as sealed. 181var obj4 = {}; 182Object.defineProperty(obj4, 'x', {configurable: true, writable: false}); 183Object.defineProperty(obj4, 'y', {configurable: false, writable: false}); 184Object.preventExtensions(obj4); 185 186assertFalse(Object.isSealed(obj4)); 187 188// Make sure that Object.seal returns the sealed object. 189var obj4 = {} 190assertTrue(obj4 === Object.seal(obj4)) 191