michael@0: // Test that the watch handler is not called recursively for the same object
michael@0: // and property.
michael@0: (function() {
michael@0:     var obj1 = {}, obj2 = {};
michael@0:     var handler_entry_count = 0;
michael@0:     var handler_exit_count = 0;
michael@0: 
michael@0:     obj1.watch('x', handler);
michael@0:     obj1.watch('y', handler);
michael@0:     obj2.watch('x', handler);
michael@0:     obj1.x = 1;
michael@0:     assertEq(handler_entry_count, 3);
michael@0:     assertEq(handler_exit_count, 3);
michael@0: 
michael@0:     function handler(id) {
michael@0:         handler_entry_count++;
michael@0:         assertEq(handler_exit_count, 0);
michael@0:         switch (true) {
michael@0:           case this === obj1 && id === "x":
michael@0:             assertEq(handler_entry_count, 1);
michael@0:             obj2.x = 3;
michael@0:             assertEq(handler_exit_count, 2);
michael@0:             break;
michael@0:           case this === obj2 && id === "x":
michael@0:             assertEq(handler_entry_count, 2);
michael@0:             obj1.y = 4;
michael@0:             assertEq(handler_exit_count, 1);
michael@0:             break;
michael@0:           default:
michael@0:             assertEq(this, obj1);
michael@0:             assertEq(id, "y");
michael@0:             assertEq(handler_entry_count, 3);
michael@0: 
michael@0:             // We expect no more watch handler invocations
michael@0:             obj1.x = 5;
michael@0:             obj1.y = 6;
michael@0:             obj2.x = 7;
michael@0:             assertEq(handler_exit_count, 0);
michael@0:             break;
michael@0:         }
michael@0:         ++handler_exit_count;
michael@0:         assertEq(handler_entry_count, 3);
michael@0:     }
michael@0: })();
michael@0: 
michael@0: 
michael@0: // Test that run-away recursion in watch handlers is properly handled.  
michael@0: (function() {
michael@0:     var obj = {};
michael@0:     var i = 0;
michael@0:     try {
michael@0:         handler();
michael@0:         throw new Error("Unreachable");
michael@0:     } catch(e) {
michael@0:         assertEq(e instanceof InternalError, true);
michael@0:     }
michael@0:     
michael@0:     function handler() {
michael@0:         var prop = "a" + ++i;
michael@0:         obj.watch(prop, handler);
michael@0:         obj[prop] = 2;
michael@0:     }
michael@0: })();