michael@0: // Return the names returned by the trap
michael@0: var target = {};
michael@0: Object.defineProperty(target, 'foo', {
michael@0:     configurable: true
michael@0: });
michael@0: var names = Object.getOwnPropertyNames(new Proxy(target, {
michael@0:     getOwnPropertyNames : function (target) {
michael@0:         return [ 'bar' ];
michael@0:     }
michael@0: }));
michael@0: assertEq(names.length, 1);
michael@0: assertEq(names[0], 'bar');
michael@0: 
michael@0: var names = Object.getOwnPropertyNames(new Proxy(Object.create(Object.create(null, {
michael@0:     a: {
michael@0:         enumerable: true,
michael@0:         configurable: true
michael@0:     },
michael@0:     b: {
michael@0:         enumerable: false,
michael@0:         configurable: true
michael@0:     }
michael@0: }), {
michael@0:     c: {
michael@0:         enumerable: true,
michael@0:         configurable: true
michael@0:     },
michael@0:     d: {
michael@0:         enumerable: false,
michael@0:         configurable: true
michael@0:     }
michael@0: }), {
michael@0:     getOwnPropertyNames: function (target) {
michael@0:         return [ 'c', 'e' ];
michael@0:     }
michael@0: }));
michael@0: assertEq(names.length, 2);
michael@0: assertEq(names[0], 'c');
michael@0: assertEq(names[1], 'e');