test/mjsunit/get-own-property-descriptor.js

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function get(){return x}
function set(x){this.x=x};

var obj = {x:1};
obj.__defineGetter__("accessor", get);
obj.__defineSetter__("accessor", set);


var descIsData = Object.getOwnPropertyDescriptor(obj,'x');
assertTrue(descIsData.enumerable);
assertTrue(descIsData.writable);
assertTrue(descIsData.configurable);

var descIsAccessor = Object.getOwnPropertyDescriptor(obj, 'accessor');
assertTrue(descIsAccessor.enumerable);
assertTrue(descIsAccessor.configurable);
assertTrue(descIsAccessor.get == get);
assertTrue(descIsAccessor.set == set);

var descIsNotData = Object.getOwnPropertyDescriptor(obj, 'not-x');
assertTrue(descIsNotData == undefined);

var descIsNotAccessor = Object.getOwnPropertyDescriptor(obj, 'not-accessor');
assertTrue(descIsNotAccessor == undefined);