michael@0: // Define a test object
michael@0: var test = {x:1,y:2};
michael@0: 
michael@0: // Put the object into dictionary mode by deleting 
michael@0: // a property that was not the last one added.
michael@0: delete test.x;
michael@0: 
michael@0: // Define a an accessor property with a setter that 
michael@0: // itself calls Object.defineProperty
michael@0: Object.defineProperty(test, "foo", {
michael@0:     get: function() { return 1; },
michael@0:     set: function(v) { 
michael@0:         Object.defineProperty(this, "foo", { value: v });
michael@0:         // Prints the correct object descriptor
michael@0:         assertEq(this.foo, 33);
michael@0:     },
michael@0:     configurable: true
michael@0: });
michael@0: 
michael@0: // Add another property, so generateOwnShape does not replace the foo property.
michael@0: test.other = 0;
michael@0: 
michael@0: // This line prints 1, as expected
michael@0: assertEq(test.foo, 1);
michael@0: 
michael@0: // Now set the property.  This calls the setter method above.
michael@0: // And the setter method prints the expected value and property descriptor.
michael@0: test.foo = 33;
michael@0: 
michael@0: // Finally read the newly set value.
michael@0: assertEq(test.foo, 33);
michael@0: 
michael@0: // Check that enumeration order is correct.
michael@0: var arr = [];
michael@0: for (var x in test) arr.push(x);
michael@0: assertEq("" + arr, "y,other");