michael@0: var flag = 0;
michael@0: var a = {};
michael@0: Object.defineProperty(a, "value", {set: function(x) {}});
michael@0: a.watch("value", function(){flag++;});
michael@0: 
michael@0: for(var i = 0; i < 100; i++) {
michael@0:     a.value = i;
michael@0:     assertEq(flag, i+1);
michael@0: }