michael@0: function strictArgs() {
michael@0:     return (function (a, b, c) {'use strict'; return arguments; })(1, 2);
michael@0: }
michael@0: 
michael@0: function normalArgs() {
michael@0:     return (function (a, b, c) { return arguments; })(1, 2);
michael@0: }
michael@0: 
michael@0: function checkProperty(options, prop, shouldThrow) {
michael@0:     var desc, orig;
michael@0:     var obj = options.strict ? strictArgs() : normalArgs();
michael@0:     var objType = options.strict ? "strict arguments." : "normal arguments.";
michael@0: 
michael@0:     function check() {
michael@0:         orig = Object.getOwnPropertyDescriptor(obj, prop);
michael@0: 
michael@0:         var threw = false;
michael@0:         try {
michael@0:             obj[prop] = obj[prop];
michael@0:         }
michael@0:         catch (e) {
michael@0:             threw = true;
michael@0:         }
michael@0:         assertEq(threw, shouldThrow, objType + prop + " threw");
michael@0: 
michael@0:         if (orig === undefined) {
michael@0:             // The property wasn't defined, so we can skip it.
michael@0:             return;
michael@0:         }
michael@0: 
michael@0:         desc = Object.getOwnPropertyDescriptor(obj, prop);
michael@0:         if ("value" in orig) {
michael@0:             assertEq(desc.value, orig.value, objType + prop + " value");
michael@0:         } else {
michael@0:             assertEq(desc.get, orig.get, objType + prop + " get");
michael@0:             assertEq(desc.set, orig.set, objType + prop + " set");
michael@0:         }
michael@0:         assertEq(desc.writable, orig.writable, objType + prop + " writable");
michael@0:         assertEq(desc.enumerable, orig.enumerable, objType + prop + " enumerable");
michael@0:         assertEq(desc.configurable, orig.configurable, objType + prop + " configurable");
michael@0:     }
michael@0: 
michael@0:     check();
michael@0: 
michael@0:     if (orig && orig.configurable) {
michael@0:         if(options.refresh) { obj = options.strict ? strictArgs() : normalArgs(); }
michael@0:         Object.defineProperty(obj, prop, {writable: false, enumerable: true});
michael@0:         check();
michael@0: 
michael@0:         if(options.refresh) { obj = options.strict ? strictArgs() : normalArgs(); }
michael@0:         Object.defineProperty(obj, prop, {writable: true, enumerable: false});
michael@0:         check();
michael@0: 
michael@0:         if(options.refresh) { obj = options.strict ? strictArgs() : normalArgs(); }
michael@0:         Object.defineProperty(obj, prop, {writable: false, configurable: false});
michael@0:         check();
michael@0:     }
michael@0: }
michael@0: 
michael@0: checkProperty({strict: true, refresh: true}, 'callee', true);
michael@0: checkProperty({strict: true, refresh: false}, 'callee', true);
michael@0: checkProperty({strict: false, refresh: true}, 'callee', false);
michael@0: checkProperty({strict: false, refresh: false}, 'callee', false);
michael@0: 
michael@0: checkProperty({strict: true, refresh: true}, 'length', false);
michael@0: checkProperty({strict: true, refresh: false}, 'length', false);
michael@0: checkProperty({strict: false, refresh: true}, 'length', false);
michael@0: checkProperty({strict: false, refresh: false}, 'length', false);
michael@0: 
michael@0: for (var i = 0; i <= 5; i++) {
michael@0:     checkProperty({strict: true, refresh: true}, "" + i, false);
michael@0:     checkProperty({strict: true, refresh: false}, "" + i, false);
michael@0:     checkProperty({strict: false, refresh: true}, "" + i, false);
michael@0:     checkProperty({strict: false, refresh: false}, "" + i, false);
michael@0: }