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. 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.seal(non_objects[key]); 38 } catch(e) { 39 exception = true; 40 assertTrue(/Object.seal 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.isSealed(non_objects[key]); 49 } catch(e) { 50 exception = true; 51 assertTrue(/Object.isSealed 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.isSealed(obj)); 70 71 Object.seal(obj); 72 73 // Make sure we are no longer extensible. 74 assertFalse(Object.isExtensible(obj)); 75 assertTrue(Object.isSealed(obj)); 76 77 // We should not be frozen, since we are still able to 78 // update values. 79 assertFalse(Object.isFrozen(obj)); 80 81 // We should not allow new properties to be added. 82 obj.foo = 42; 83 assertEquals(obj.foo, undefined); 84 85 desc = Object.getOwnPropertyDescriptor(obj, 'x'); 86 assertTrue(desc.writable); 87 assertFalse(desc.configurable); 88 assertEquals(42, desc.value); 89 90 desc = Object.getOwnPropertyDescriptor(obj, 'z'); 91 assertTrue(desc.writable); 92 assertFalse(desc.configurable); 93 assertEquals("foobar", desc.value); 94 95 // Since writable is not affected by seal we should still be able to 96 // update the values. 97 obj.x = "43"; 98 assertEquals("43", obj.x); 99 100 // Test on accessors. 101 var obj2 = {}; 102 function get() { return 43; }; 103 function set() {}; 104 Object.defineProperty(obj2, 'x', { get: get, set: set, configurable: true }); 105 106 desc = Object.getOwnPropertyDescriptor(obj2, 'x'); 107 assertTrue(desc.configurable); 108 assertEquals(undefined, desc.value); 109 assertEquals(set, desc.set); 110 assertEquals(get, desc.get); 111 112 assertTrue(Object.isExtensible(obj2)); 113 assertFalse(Object.isSealed(obj2)); 114 Object.seal(obj2); 115 116 // Since this is an accessor property the object is now effectively both 117 // sealed and frozen (accessors has no writable attribute). 118 assertTrue(Object.isFrozen(obj2)); 119 assertFalse(Object.isExtensible(obj2)); 120 assertTrue(Object.isSealed(obj2)); 121 122 desc = Object.getOwnPropertyDescriptor(obj2, 'x'); 123 assertFalse(desc.configurable); 124 assertEquals(undefined, desc.value); 125 assertEquals(set, desc.set); 126 assertEquals(get, desc.get); 127 128 obj2.foo = 42; 129 assertEquals(obj2.foo, undefined); 130 131 // Test seal on arrays. 132 var arr = new Array(42,43); 133 134 desc = Object.getOwnPropertyDescriptor(arr, '0'); 135 assertTrue(desc.configurable); 136 assertTrue(desc.writable); 137 assertEquals(42, desc.value); 138 139 desc = Object.getOwnPropertyDescriptor(arr, '1'); 140 assertTrue(desc.configurable); 141 assertTrue(desc.writable); 142 assertEquals(43, desc.value); 143 144 assertTrue(Object.isExtensible(arr)); 145 assertFalse(Object.isSealed(arr)); 146 Object.seal(arr); 147 assertTrue(Object.isSealed(arr)); 148 assertFalse(Object.isExtensible(arr)); 149 // Since the values in the array is still writable this object 150 // is not frozen. 151 assertFalse(Object.isFrozen(arr)); 152 153 desc = Object.getOwnPropertyDescriptor(arr, '0'); 154 assertFalse(desc.configurable); 155 assertTrue(desc.writable); 156 assertEquals(42, desc.value); 157 158 desc = Object.getOwnPropertyDescriptor(arr, '1'); 159 assertFalse(desc.configurable); 160 assertTrue(desc.writable); 161 assertEquals(43, desc.value); 162 163 arr[0] = 'foo'; 164 165 // We should be able to overwrite the existing value. 166 assertEquals('foo', arr[0]); 167 168 169 // Test that isSealed returns the correct value even if configurable 170 // has been set to false on all properties manually and the extensible 171 // flag has also been set to false manually. 172 var obj3 = { x: 42, y: 'foo' }; 173 174 assertFalse(Object.isFrozen(obj3)); 175 176 Object.defineProperty(obj3, 'x', {configurable: false, writable: true}); 177 Object.defineProperty(obj3, 'y', {configurable: false, writable: false}); 178 Object.preventExtensions(obj3); 179 180 assertTrue(Object.isSealed(obj3)); 181 182 183 // Make sure that an object that has a configurable property 184 // is not classified as sealed. 185 var obj4 = {}; 186 Object.defineProperty(obj4, 'x', {configurable: true, writable: false}); 187 Object.defineProperty(obj4, 'y', {configurable: false, writable: false}); 188 Object.preventExtensions(obj4); 189 190 assertFalse(Object.isSealed(obj4)); 191 192 // Make sure that Object.seal returns the sealed object. 193 var obj4 = {}; 194 assertTrue(obj4 === Object.seal(obj4)); 195
