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.freeze and Object.isFrozen 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. 33 var non_objects = new Array(undefined, null, 1, -1, 0, 42.43); 34 for (var key in non_objects) { 35 var exception = false; 36 try { 37 Object.freeze(non_objects[key]); 38 } catch(e) { 39 exception = true; 40 assertTrue(/Object.freeze called on non-object/.test(e)); 41 } 42 assertTrue(exception); 43 } 44 45 for (var key in non_objects) { 46 exception = false; 47 try { 48 Object.isFrozen(non_objects[key]); 49 } catch(e) { 50 exception = true; 51 assertTrue(/Object.isFrozen called on non-object/.test(e)); 52 } 53 assertTrue(exception); 54 } 55 56 // Test normal data properties. 57 var obj = { x: 42, z: 'foobar' }; 58 var desc = Object.getOwnPropertyDescriptor(obj, 'x'); 59 assertTrue(desc.writable); 60 assertTrue(desc.configurable); 61 assertEquals(42, desc.value); 62 63 desc = Object.getOwnPropertyDescriptor(obj, 'z'); 64 assertTrue(desc.writable); 65 assertTrue(desc.configurable); 66 assertEquals('foobar', desc.value); 67 68 assertTrue(Object.isExtensible(obj)); 69 assertFalse(Object.isFrozen(obj)); 70 71 Object.freeze(obj); 72 73 // Make sure we are no longer extensible. 74 assertFalse(Object.isExtensible(obj)); 75 assertTrue(Object.isFrozen(obj)); 76 77 obj.foo = 42; 78 assertEquals(obj.foo, undefined); 79 80 desc = Object.getOwnPropertyDescriptor(obj, 'x'); 81 assertFalse(desc.writable); 82 assertFalse(desc.configurable); 83 assertEquals(42, desc.value); 84 85 desc = Object.getOwnPropertyDescriptor(obj, 'z'); 86 assertFalse(desc.writable); 87 assertFalse(desc.configurable); 88 assertEquals("foobar", desc.value); 89 90 // Make sure that even if we try overwrite a value that is not writable, it is 91 // not changed. 92 obj.x = "tete"; 93 assertEquals(42, obj.x); 94 obj.x = { get: function() {return 43}, set: function() {} }; 95 assertEquals(42, obj.x); 96 97 // Test on accessors. 98 var obj2 = {}; 99 function get() { return 43; }; 100 function set() {}; 101 Object.defineProperty(obj2, 'x', { get: get, set: set, configurable: true }); 102 103 desc = Object.getOwnPropertyDescriptor(obj2, 'x'); 104 assertTrue(desc.configurable); 105 assertEquals(undefined, desc.value); 106 assertEquals(set, desc.set); 107 assertEquals(get, desc.get); 108 109 assertTrue(Object.isExtensible(obj2)); 110 assertFalse(Object.isFrozen(obj2)); 111 Object.freeze(obj2); 112 assertTrue(Object.isFrozen(obj2)); 113 assertFalse(Object.isExtensible(obj2)); 114 115 desc = Object.getOwnPropertyDescriptor(obj2, 'x'); 116 assertFalse(desc.configurable); 117 assertEquals(undefined, desc.value); 118 assertEquals(set, desc.set); 119 assertEquals(get, desc.get); 120 121 obj2.foo = 42; 122 assertEquals(obj2.foo, undefined); 123 124 125 // Test freeze on arrays. 126 var arr = new Array(42,43); 127 128 desc = Object.getOwnPropertyDescriptor(arr, '0'); 129 assertTrue(desc.configurable); 130 assertTrue(desc.writable); 131 assertEquals(42, desc.value); 132 133 desc = Object.getOwnPropertyDescriptor(arr, '1'); 134 assertTrue(desc.configurable); 135 assertTrue(desc.writable); 136 assertEquals(43, desc.value); 137 138 assertTrue(Object.isExtensible(arr)); 139 assertFalse(Object.isFrozen(arr)); 140 Object.freeze(arr); 141 assertTrue(Object.isFrozen(arr)); 142 assertFalse(Object.isExtensible(arr)); 143 144 desc = Object.getOwnPropertyDescriptor(arr, '0'); 145 assertFalse(desc.configurable); 146 assertFalse(desc.writable); 147 assertEquals(42, desc.value); 148 149 desc = Object.getOwnPropertyDescriptor(arr, '1'); 150 assertFalse(desc.configurable); 151 assertFalse(desc.writable); 152 assertEquals(43, desc.value); 153 154 arr[0] = 'foo'; 155 156 assertEquals(arr[0], 42); 157 158 159 // Test that isFrozen return the correct value even if configurable has been set 160 // to false on all properties manually and the extensible flag has also been set 161 // to false manually. 162 var obj3 = { x: 42, y: 'foo' }; 163 164 assertFalse(Object.isFrozen(obj3)); 165 166 Object.defineProperty(obj3, 'x', {configurable: false, writable: false}); 167 Object.defineProperty(obj3, 'y', {configurable: false, writable: false}); 168 Object.preventExtensions(obj3); 169 170 assertTrue(Object.isFrozen(obj3)); 171 172 173 // Make sure that an object that has only non-configurable, but one 174 // writable property, is not classified as frozen. 175 var obj4 = {}; 176 Object.defineProperty(obj4, 'x', {configurable: false, writable: true}); 177 Object.defineProperty(obj4, 'y', {configurable: false, writable: false}); 178 Object.preventExtensions(obj4); 179 180 assertFalse(Object.isFrozen(obj4)); 181 182 // Make sure that an object that has only non-writable, but one 183 // configurable property, is not classified as frozen. 184 var obj5 = {}; 185 Object.defineProperty(obj5, 'x', {configurable: true, writable: false}); 186 Object.defineProperty(obj5, 'y', {configurable: false, writable: false}); 187 Object.preventExtensions(obj5); 188 189 assertFalse(Object.isFrozen(obj5)); 190 191 // Make sure that Object.freeze returns the frozen object. 192 var obj6 = {} 193 assertTrue(obj6 === Object.freeze(obj6)) 194
