Test to ensure correct behaviour of Object.defineProperty On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS JSON.stringify(Object.getOwnPropertyDescriptor(Object.defineProperty({}, 'foo', {value:1}), 'foo')) is JSON.stringify({value: 1, writable: false, enumerable: false, configurable: false}) PASS JSON.stringify(Object.getOwnPropertyDescriptor(Object.defineProperty({}, 'foo', {}), 'foo')) is JSON.stringify({writable: false, enumerable: false, configurable: false}) PASS JSON.stringify(Object.getOwnPropertyDescriptor(Object.defineProperty({}, 'foo', {get:undefined}), 'foo')) is JSON.stringify({enumerable: false, configurable: false}) PASS JSON.stringify(Object.getOwnPropertyDescriptor(Object.defineProperty({}, 'foo', {value:1, writable: false}), 'foo')) is JSON.stringify({value: 1, writable: false, enumerable: false, configurable: false}) PASS JSON.stringify(Object.getOwnPropertyDescriptor(Object.defineProperty({}, 'foo', {value:1, writable: true}), 'foo')) is JSON.stringify({value: 1, writable: true, enumerable: false, configurable: false}) PASS JSON.stringify(Object.getOwnPropertyDescriptor(Object.defineProperty({}, 'foo', {value:1, enumerable: false}), 'foo')) is JSON.stringify({value: 1, writable: false, enumerable: false, configurable: false}) PASS JSON.stringify(Object.getOwnPropertyDescriptor(Object.defineProperty({}, 'foo', {value:1, enumerable: true}), 'foo')) is JSON.stringify({value: 1, writable: false, enumerable: true, configurable: false}) PASS JSON.stringify(Object.getOwnPropertyDescriptor(Object.defineProperty({}, 'foo', {value:1, configurable: false}), 'foo')) is JSON.stringify({value: 1, writable: false, enumerable: false, configurable: false}) PASS JSON.stringify(Object.getOwnPropertyDescriptor(Object.defineProperty({}, 'foo', {value:1, configurable: true}), 'foo')) is JSON.stringify({value: 1, writable: false, enumerable: false, configurable: true}) PASS JSON.stringify(Object.getOwnPropertyDescriptor(Object.defineProperty([1,2,3], 'foo', {value:1, configurable: true}), 'foo')) is JSON.stringify({value: 1, writable: false, enumerable: false, configurable: true}) PASS Object.getOwnPropertyDescriptor(Object.defineProperty([1,2,3], '1', {value:'foo', configurable: true}), '1').value is 'foo' PASS a=[1,2,3], Object.defineProperty(a, '1', {value:'foo', configurable: true}), a[1] is 'foo' PASS Object.getOwnPropertyDescriptor(Object.defineProperty([1,2,3], '1', {get:getter, configurable: true}), '1').get is getter PASS Object.defineProperty([1,2,3], '1', {get:getter, configurable: true})[1] threw exception called getter. PASS Object.defineProperty() threw exception TypeError: Properties can only be defined on Objects.. PASS Object.defineProperty(null) threw exception TypeError: Properties can only be defined on Objects.. PASS Object.defineProperty('foo') threw exception TypeError: Properties can only be defined on Objects.. PASS Object.defineProperty({}) threw exception TypeError: Property description must be an object.. PASS Object.defineProperty({}, 'foo') threw exception TypeError: Property description must be an object.. PASS Object.defineProperty({}, 'foo', {get:undefined, value:true}).foo threw exception TypeError: Invalid property. 'value' present on property with getter or setter.. PASS Object.defineProperty({get foo() { return true; } }, 'foo', {configurable:false}).foo is true PASS Object.defineProperty(createUnconfigurableProperty({}, 'foo'), 'foo', {configurable: true}) threw exception TypeError: Attempting to change configurable attribute of unconfigurable property.. PASS Object.defineProperty(createUnconfigurableProperty({}, 'foo'), 'foo', {writable: true}) threw exception TypeError: Attempting to change writable attribute of unconfigurable property.. PASS Object.defineProperty(createUnconfigurableProperty({}, 'foo'), 'foo', {enumerable: true}) threw exception TypeError: Attempting to change enumerable attribute of unconfigurable property.. PASS Object.defineProperty(createUnconfigurableProperty({}, 'foo', false, true), 'foo', {enumerable: false}), 'foo' threw exception TypeError: Attempting to change enumerable attribute of unconfigurable property.. PASS JSON.stringify(Object.getOwnPropertyDescriptor(Object.defineProperty(createUnconfigurableProperty({}, 'foo', true), 'foo', {writable: false}), 'foo')) is JSON.stringify({value: 1, writable: false, enumerable: false, configurable: false}) PASS Object.defineProperty({}, 'foo', {value:1, get: function(){}}) threw exception TypeError: Invalid property. 'value' present on property with getter or setter.. PASS Object.defineProperty({}, 'foo', {value:1, set: function(){}}) threw exception TypeError: Invalid property. 'value' present on property with getter or setter.. PASS Object.defineProperty({}, 'foo', {writable:true, get: function(){}}) threw exception TypeError: Invalid property. 'writable' present on property with getter or setter.. PASS Object.defineProperty({}, 'foo', {writable:true, set: function(){}}) threw exception TypeError: Invalid property. 'writable' present on property with getter or setter.. PASS Object.defineProperty({}, 'foo', {get: null}) threw exception TypeError: Getter must be a function.. PASS Object.defineProperty({}, 'foo', {set: null}) threw exception TypeError: Setter must be a function.. PASS Object.defineProperty({}, 'foo', {set: setter}).foo='test' threw exception called setter. PASS Object.defineProperty(Object.defineProperty({}, 'foo', {set: setter}), 'foo', {set: setter1}) threw exception TypeError: Attempting to change the setter of an unconfigurable property.. PASS Object.defineProperty(Object.defineProperty({}, 'foo', {set: setter}), 'foo', {get: getter1}) threw exception TypeError: Attempting to change the getter of an unconfigurable property.. PASS Object.defineProperty(Object.defineProperty({}, 'foo', {set: setter}), 'foo', {value: 1}) threw exception TypeError: Attempting to change access mechanism for an unconfigurable property.. PASS Object.defineProperty(Object.defineProperty({}, 'foo', {set: setter, configurable: true}), 'foo', {set: setter1}).foo='test' threw exception called setter1. PASS Object.defineProperty(Object.defineProperty({}, 'foo', {set: setter, configurable: true}), 'foo', {get: getter1}).foo threw exception called getter1. PASS Object.defineProperty(Object.defineProperty({}, 'foo', {set: setter, configurable: true}), 'foo', {value: true}).foo is true PASS 'foo' in Object.defineProperty(Object.defineProperty({}, 'foo', {set: setter, configurable: true}), 'foo', {writable: true}) is true PASS Object.defineProperty(Object.defineProperty({}, 'foo', {set: setter, configurable: true}), 'foo', {writable: true}).foo is undefined. PASS Object.defineProperty({}, 'foo', {get: getter}).foo threw exception called getter. PASS Object.defineProperty(Object.defineProperty({}, 'foo', {get: getter}), 'foo', {get: getter1}) threw exception TypeError: Attempting to change the getter of an unconfigurable property.. PASS Object.defineProperty(Object.defineProperty({}, 'foo', {get: getter}), 'foo', {set: setter1}) threw exception TypeError: Attempting to change the setter of an unconfigurable property.. PASS Object.defineProperty(Object.defineProperty({}, 'foo', {get: getter, configurable: true}), 'foo', {get: getter1}).foo threw exception called getter1. PASS Object.defineProperty(Object.defineProperty({}, 'foo', {get: getter, configurable: true}), 'foo', {set: setter1}).foo='test' threw exception called setter1. PASS Object.defineProperty(Object.defineProperty({}, 'foo', {get: getter, configurable: true}), 'foo', {value: true}).foo is true PASS Object.defineProperty(Object.defineProperty({}, 'foo', {get: getter, configurable: true}), 'foo', {writable: true}).foo is undefined. PASS 'foo' in Object.defineProperty(Object.defineProperty({}, 'foo', {get: getter, configurable: true}), 'foo', {writable: true}) is true PASS Object.defineProperty(Object.defineProperty({}, 'foo', {value: 1}), 'foo', {set: setter1}) threw exception TypeError: Attempting to change access mechanism for an unconfigurable property.. PASS Object.defineProperty(Object.defineProperty({}, 'foo', {value: 1, configurable: true}), 'foo', {set: setter1}).foo='test' threw exception called setter1. PASS Object.defineProperty(Object.defineProperty({}, 'foo', {value: 1}), 'foo', {get: getter1}) threw exception TypeError: Attempting to change access mechanism for an unconfigurable property.. PASS Object.defineProperty(Object.defineProperty({}, 'foo', {value: 1}), 'foo', {set: setter1}) threw exception TypeError: Attempting to change access mechanism for an unconfigurable property.. PASS Object.defineProperty(Object.defineProperty({}, 'foo', {value: 1, configurable: true}), 'foo', {get: getter1}).foo threw exception called getter1. PASS Object.defineProperty(Object.defineProperty({}, 'foo', {value: 1, configurable: true}), 'foo', {set: setter1}).foo='test' threw exception called setter1. PASS Object.defineProperty(Object.defineProperty({}, 'foo', {value: 1, configurable: true, writable: false}), 'foo', {value: 2, configurable: true, writable: true}).foo is 2 PASS Object.defineProperty(Object.defineProperty({}, 'foo', {value: 1, configurable: true, writable: false}), 'foo', {value: 2, configurable: true, writable: false}).foo is 2 PASS Object.defineProperty(Object.defineProperty({}, 'foo', {value: 1, configurable: false, writable: false}), 'foo', {value: 1, configurable: false, writable: false}).foo is 1 PASS Object.defineProperty(Object.defineProperty({}, 'foo', {get: function() { return 1; }, configurable: true, enumerable: true}), 'foo', {get: function() { return 2; }, configurable: true, enumerable: false}).foo is 2 PASS Object.defineProperty(Object.defineProperty({}, 'foo', {get: function() { return 1; }, configurable: true, enumerable: false}), 'foo', {get: function() { return 2; }, configurable: true, enumerable: false}).foo is 2 PASS var result = false; var o = Object.defineProperty(Object.defineProperty({}, 'foo', {get: function() { return 1; }, configurable: true, enumerable: true}), 'foo', {get: function() { return 2; }, configurable: true, enumerable: false}); for (x in o) result = true; result is false PASS var result = false; var o = Object.defineProperty(Object.defineProperty({}, 'foo', {get: function() { return 1; }, configurable: true, enumerable: false}), 'foo', {get: function() { return 2; }, configurable: true, enumerable: true}); for (x in o) result = true; result is true PASS var o = Object.defineProperty({}, 'foo', {get: function() { return 1; }, configurable: true}); delete o.foo; o.foo is undefined. PASS var o = Object.defineProperty({}, 'foo', {get: function() { return 1; }, configurable: false}); delete o.foo; o.foo is 1 PASS Object.defineProperty(Object.defineProperty({}, 'foo', {get: function() { return 1; }, configurable: true}), 'foo', {value:2}).foo is 2 PASS Object.defineProperty(Object.defineProperty({}, 'foo', {get: function() { return 1; }, configurable: false}), 'foo', {value:2}).foo threw exception TypeError: Attempting to change access mechanism for an unconfigurable property.. PASS var o = Object.defineProperty(Object.defineProperty({}, 'foo', {get: function() { return 1; }, configurable: true}), 'foo', {value:2}); o.foo = 3; o.foo is 2 PASS Object.defineProperty(Object.defineProperty({}, 'foo', {value: 1}), 'foo', {value:2, configurable: true}) threw exception TypeError: Attempting to change configurable attribute of unconfigurable property.. PASS Object.defineProperty(Object.defineProperty([], 'foo', {value: 1}), 'foo', {value:2, configurable: true}) threw exception TypeError: Attempting to change configurable attribute of unconfigurable property.. PASS var o = Object.defineProperty({}, 'foo', {get:function(){return 42;}, set:function(x){this.result = x;}}); o.foo is 42 PASS var o = Object.defineProperty({}, 'foo', {get:function(){return 42;}, set:function(x){this.result = x;}}); o.foo = 42; o.result; is 42 PASS var o = Object.defineProperty({}, 'foo', {get:undefined, set:function(x){this.result = x;}}); o.foo is undefined PASS var o = Object.defineProperty({}, 'foo', {get:undefined, set:function(x){this.result = x;}}); o.foo = 42; o.result; is 42 PASS var o = Object.defineProperty({}, 'foo', {set:function(x){this.result = x;}}); o.foo is undefined PASS var o = Object.defineProperty({}, 'foo', {set:function(x){this.result = x;}}); o.foo = 42; o.result; is 42 PASS var o = Object.defineProperty({}, 'foo', {get:function(){return 42;}, set:undefined}); o.foo is 42 PASS var o = Object.defineProperty({}, 'foo', {get:function(){return 42;}, set:undefined}); o.foo = 42; o.result; is undefined PASS var o = Object.defineProperty({}, 'foo', {get:function(){return 42;}}); o.foo is 42 PASS var o = Object.defineProperty({}, 'foo', {get:function(){return 42;}}); o.foo = 42; o.result; is undefined PASS var o = Object.defineProperty({}, 'foo', {get:undefined, set:undefined}); o.foo is undefined PASS var o = Object.defineProperty({}, 'foo', {get:undefined, set:undefined}); o.foo = 42; o.result; is undefined PASS var o = Object.defineProperty(Object.defineProperty({foo:1}, 'foo', {get:function(){return 42;}, set:function(x){this.result = x;}}), 'foo', {get:function(){return 13;}}); o.foo is 13 PASS var o = Object.defineProperty(Object.defineProperty({foo:1}, 'foo', {get:function(){return 42;}, set:function(x){this.result = x;}}), 'foo', {get:function(){return 13;}}); o.foo = 42; o.result; is 42 PASS var o = Object.defineProperty(Object.defineProperty({foo:1}, 'foo', {get:function(){return 42;}, set:function(x){this.result = x;}}), 'foo', {get:undefined}); o.foo is undefined PASS var o = Object.defineProperty(Object.defineProperty({foo:1}, 'foo', {get:function(){return 42;}, set:function(x){this.result = x;}}), 'foo', {get:undefined}); o.foo = 42; o.result; is 42 PASS var o = Object.defineProperty(Object.defineProperty({foo:1}, 'foo', {get:function(){return 42;}, set:function(x){this.result = x;}}), 'foo', {set:function(){this.result = 13;}}); o.foo is 42 PASS var o = Object.defineProperty(Object.defineProperty({foo:1}, 'foo', {get:function(){return 42;}, set:function(x){this.result = x;}}), 'foo', {set:function(){this.result = 13;}}); o.foo = 42; o.result; is 13 PASS var o = Object.defineProperty(Object.defineProperty({foo:1}, 'foo', {get:function(){return 42;}, set:function(x){this.result = x;}}), 'foo', {set:undefined}); o.foo is 42 PASS var o = Object.defineProperty(Object.defineProperty({foo:1}, 'foo', {get:function(){return 42;}, set:function(x){this.result = x;}}), 'foo', {set:undefined}); o.foo = 42; o.result; is undefined PASS 'use strict'; var o = Object.defineProperty({}, 'foo', {get:function(){return 42;}, set:function(x){this.result = x;}}); o.foo is 42 PASS 'use strict'; var o = Object.defineProperty({}, 'foo', {get:function(){return 42;}, set:function(x){this.result = x;}}); o.foo = 42; o.result; is 42 PASS 'use strict'; var o = Object.defineProperty({}, 'foo', {get:undefined, set:function(x){this.result = x;}}); o.foo is undefined PASS 'use strict'; var o = Object.defineProperty({}, 'foo', {get:undefined, set:function(x){this.result = x;}}); o.foo = 42; o.result; is 42 PASS 'use strict'; var o = Object.defineProperty({}, 'foo', {set:function(x){this.result = x;}}); o.foo is undefined PASS 'use strict'; var o = Object.defineProperty({}, 'foo', {set:function(x){this.result = x;}}); o.foo = 42; o.result; is 42 PASS 'use strict'; var o = Object.defineProperty({}, 'foo', {get:function(){return 42;}, set:undefined}); o.foo is 42 PASS 'use strict'; var o = Object.defineProperty({}, 'foo', {get:function(){return 42;}, set:undefined}); o.foo = 42; o.result; threw exception TypeError: Attempted to assign to readonly property.. PASS 'use strict'; var o = Object.defineProperty({}, 'foo', {get:function(){return 42;}}); o.foo is 42 PASS 'use strict'; var o = Object.defineProperty({}, 'foo', {get:function(){return 42;}}); o.foo = 42; o.result; threw exception TypeError: Attempted to assign to readonly property.. PASS 'use strict'; var o = Object.defineProperty({}, 'foo', {get:undefined, set:undefined}); o.foo is undefined PASS 'use strict'; var o = Object.defineProperty({}, 'foo', {get:undefined, set:undefined}); o.foo = 42; o.result; threw exception TypeError: Attempted to assign to readonly property.. PASS 'use strict'; var o = Object.defineProperty(Object.defineProperty({foo:1}, 'foo', {get:function(){return 42;}, set:function(x){this.result = x;}}), 'foo', {get:function(){return 13;}}); o.foo is 13 PASS 'use strict'; var o = Object.defineProperty(Object.defineProperty({foo:1}, 'foo', {get:function(){return 42;}, set:function(x){this.result = x;}}), 'foo', {get:function(){return 13;}}); o.foo = 42; o.result; is 42 PASS 'use strict'; var o = Object.defineProperty(Object.defineProperty({foo:1}, 'foo', {get:function(){return 42;}, set:function(x){this.result = x;}}), 'foo', {get:undefined}); o.foo is undefined PASS 'use strict'; var o = Object.defineProperty(Object.defineProperty({foo:1}, 'foo', {get:function(){return 42;}, set:function(x){this.result = x;}}), 'foo', {get:undefined}); o.foo = 42; o.result; is 42 PASS 'use strict'; var o = Object.defineProperty(Object.defineProperty({foo:1}, 'foo', {get:function(){return 42;}, set:function(x){this.result = x;}}), 'foo', {set:function(){this.result = 13;}}); o.foo is 42 PASS 'use strict'; var o = Object.defineProperty(Object.defineProperty({foo:1}, 'foo', {get:function(){return 42;}, set:function(x){this.result = x;}}), 'foo', {set:function(){this.result = 13;}}); o.foo = 42; o.result; is 13 PASS 'use strict'; var o = Object.defineProperty(Object.defineProperty({foo:1}, 'foo', {get:function(){return 42;}, set:function(x){this.result = x;}}), 'foo', {set:undefined}); o.foo is 42 PASS 'use strict'; var o = Object.defineProperty(Object.defineProperty({foo:1}, 'foo', {get:function(){return 42;}, set:function(x){this.result = x;}}), 'foo', {set:undefined}); o.foo = 42; o.result; threw exception TypeError: Attempted to assign to readonly property.. PASS 0 in Object.prototype is true PASS '0' in Object.prototype is true PASS var o = {}; o.readOnly = false; o.readOnly is true PASS 'use strict'; var o = {}; o.readOnly = false; o.readOnly threw exception TypeError: Attempted to assign to readonly property.. PASS Object.getOwnPropertyDescriptor(Object.defineProperty(Object.defineProperty({}, 'foo', {get: function() { return false; }, configurable: true}), 'foo', {value:false}), 'foo').writable is false PASS Object.getOwnPropertyDescriptor(Object.defineProperty(Object.defineProperty({}, 'foo', {get: function() { return false; }, configurable: true}), 'foo', {value:false, writable: false}), 'foo').writable is false PASS Object.getOwnPropertyDescriptor(Object.defineProperty(Object.defineProperty({}, 'foo', {get: function() { return false; }, configurable: true}), 'foo', {value:false, writable: true}), 'foo').writable is true PASS var a = Object.defineProperty([], 'length', {writable: false}); a[0] = 42; 0 in a; is false PASS 'use strict'; var a = Object.defineProperty([], 'length', {writable: false}); a[0] = 42; 0 in a; threw exception TypeError: Attempted to assign to readonly property.. PASS var a = Object.defineProperty([42], '0', {writable: false}); a[0] = false; a[0]; is 42 PASS 'use strict'; var a = Object.defineProperty([42], '0', {writable: false}); a[0] = false; a[0]; threw exception TypeError: Attempted to assign to readonly property.. PASS var a = Object.defineProperty([], '0', {set: undefined}); a[0] = 42; a[0]; is undefined. PASS 'use strict'; var a = Object.defineProperty([], '0', {set: undefined}); a[0] = 42; a[0]; threw exception TypeError: Attempted to assign to readonly property.. PASS anObj.slot1 is "foo" PASS anObj.slot2 is "bar" PASS anObj.propertyIsEnumerable('slot1') is true PASS anObj.propertyIsEnumerable('slot2') is false PASS anObj.slot4 is "goo" PASS anObj.slot5 is 123 PASS anObj._Slot5 is 123 PASS Object.getOwnPropertyDescriptor(anObj, 'slot5') is undefined. PASS anObj.slot5 is 456 PASS anObj._Slot5 is 123 PASS Object.getOwnPropertyDescriptor(anObj, 'slot5').value is 456 PASS anObj.slot1 is "foo" PASS anObj.slot2 is "bar" PASS anObj.propertyIsEnumerable('slot1') is true PASS anObj.propertyIsEnumerable('slot2') is false PASS anObj.slot4 is "goo" PASS anObj.slot5 is 123 PASS anObj._Slot5 is 123 PASS Object.getOwnPropertyDescriptor(anObj, 'slot5') is undefined. PASS anObj.slot5 is 456 PASS anObj._Slot5 is 123 PASS Object.getOwnPropertyDescriptor(anObj, 'slot5').value is 456 PASS successfullyParsed is true TEST COMPLETE