tests/stress/symbol-define-property.js

   1 // This tests Object.create, Object.defineProperty, Object.defineProperties work with Symbol.
   2
   3 function testSymbol(object) {
   4     if (!object.hasOwnProperty(Symbol.iterator))
   5         throw "Error: object doesn't have Symbol.iterator";
   6     if (object.propertyIsEnumerable(Symbol.iterator))
   7         throw "Error: Symbol.iterator is defined as enumerable";
   8     if (JSON.stringify(Object.getOwnPropertyDescriptor(object, Symbol.iterator)) !== '{"value":42,"writable":false,"enumerable":false,"configurable":false}')
   9         throw "Error: bad property descriptor " + JSON.stringify(Object.getOwnPropertyDescriptor(object, Symbol.iterator));
  10     if (Object.getOwnPropertySymbols(object).length !== 1)
  11     throw "Error: bad value " + Object.getOwnPropertySymbols(object).length;
  12     if (Object.getOwnPropertySymbols(object)[0] !== Symbol.iterator)
  13         throw "Error: bad value " + String(Object.getOwnPropertySymbols(object)[0]);
  14 }
  15
  16 var object = Object.create(Object.prototype, {
  17     [Symbol.iterator]: {
  18         value: 42
  19     }
  20 });
  21 testSymbol(object);
  22
  23 var object = Object.defineProperties({}, {
  24     [Symbol.iterator]: {
  25         value: 42
  26     }
  27 });
  28 testSymbol(object);
  29
  30 var object = Object.defineProperty({}, Symbol.iterator, {
  31     value: 42
  32 });
  33 testSymbol(object);