michael@0: /*
michael@0:  * Any copyright is dedicated to the Public Domain.
michael@0:  * http://creativecommons.org/licenses/publicdomain/
michael@0:  * Contributor:
michael@0:  *   Jeff Walden <jwalden+code@mit.edu>
michael@0:  */
michael@0: 
michael@0: var gTestfile = 'mutation-prevention-methods.js';
michael@0: //-----------------------------------------------------------------------------
michael@0: var BUGNUMBER = 492849;
michael@0: var summary = 'Object.is{Sealed,Frozen}, Object.{seal,freeze}';
michael@0: 
michael@0: print(BUGNUMBER + ": " + summary);
michael@0: 
michael@0: /**************
michael@0:  * BEGIN TEST *
michael@0:  **************/
michael@0: 
michael@0: // Empty object
michael@0: 
michael@0: var o1 = {};
michael@0: 
michael@0: assertEq(Object.isExtensible(o1), true);
michael@0: assertEq(Object.isSealed(o1), false);
michael@0: assertEq(Object.isFrozen(o1), false);
michael@0: 
michael@0: Object.preventExtensions(o1);
michael@0: 
michael@0: // An non-extensible empty object has no properties, so it is vacuously sealed
michael@0: // and frozen.
michael@0: assertEq(Object.isExtensible(o1), false);
michael@0: assertEq(Object.isSealed(o1), true);
michael@0: assertEq(Object.isFrozen(o1), true);
michael@0: 
michael@0: 
michael@0: // Object with a data property
michael@0: 
michael@0: var o2 = { 1: 2 };
michael@0: 
michael@0: assertEq(Object.isExtensible(o2), true);
michael@0: assertEq(Object.isSealed(o2), false);
michael@0: assertEq(Object.isFrozen(o2), false);
michael@0: 
michael@0: Object.preventExtensions(o2);
michael@0: 
michael@0: assertEq(Object.isExtensible(o2), false);
michael@0: assertEq(Object.isSealed(o2), false);
michael@0: assertEq(Object.isFrozen(o2), false);
michael@0: 
michael@0: Object.seal(o2);
michael@0: 
michael@0: assertEq(Object.isExtensible(o2), false);
michael@0: assertEq(Object.isSealed(o2), true);
michael@0: assertEq(Object.isFrozen(o2), false);
michael@0: 
michael@0: assertEq(o2[1], 2);
michael@0: 
michael@0: var desc;
michael@0: 
michael@0: desc = Object.getOwnPropertyDescriptor(o2, "1");
michael@0: assertEq(typeof desc, "object");
michael@0: assertEq(desc.enumerable, true);
michael@0: assertEq(desc.configurable, false);
michael@0: assertEq(desc.value, 2);
michael@0: assertEq(desc.writable, true);
michael@0: 
michael@0: o2[1] = 17;
michael@0: 
michael@0: assertEq(o2[1], 17);
michael@0: 
michael@0: desc = Object.getOwnPropertyDescriptor(o2, "1");
michael@0: assertEq(typeof desc, "object");
michael@0: assertEq(desc.enumerable, true);
michael@0: assertEq(desc.configurable, false);
michael@0: assertEq(desc.value, 17);
michael@0: assertEq(desc.writable, true);
michael@0: 
michael@0: Object.freeze(o2);
michael@0: 
michael@0: assertEq(o2[1], 17);
michael@0: 
michael@0: desc = Object.getOwnPropertyDescriptor(o2, "1");
michael@0: assertEq(typeof desc, "object");
michael@0: assertEq(desc.enumerable, true);
michael@0: assertEq(desc.configurable, false);
michael@0: assertEq(desc.value, 17);
michael@0: assertEq(desc.writable, false);
michael@0: 
michael@0: 
michael@0: // Object with an accessor property
michael@0: 
michael@0: var o3 = { get foo() { return 17; } };
michael@0: 
michael@0: assertEq(Object.isExtensible(o3), true);
michael@0: assertEq(Object.isSealed(o3), false);
michael@0: assertEq(Object.isFrozen(o3), false);
michael@0: 
michael@0: Object.preventExtensions(o3);
michael@0: 
michael@0: assertEq(Object.isExtensible(o3), false);
michael@0: assertEq(Object.isSealed(o3), false);
michael@0: assertEq(Object.isFrozen(o3), false);
michael@0: 
michael@0: Object.seal(o3);
michael@0: 
michael@0: // An accessor property in a sealed object is unchanged if that object is
michael@0: // frozen, so a sealed object containing only accessor properties is also
michael@0: // vacuously frozen.
michael@0: assertEq(Object.isExtensible(o3), false);
michael@0: assertEq(Object.isSealed(o3), true);
michael@0: assertEq(Object.isFrozen(o3), true);
michael@0: 
michael@0: Object.freeze(o3);
michael@0: 
michael@0: assertEq(Object.isExtensible(o3), false);
michael@0: assertEq(Object.isSealed(o3), true);
michael@0: assertEq(Object.isFrozen(o3), true);
michael@0: 
michael@0: 
michael@0: /******************************************************************************/
michael@0: 
michael@0: reportCompare(true, true);
michael@0: 
michael@0: print("All tests passed!");