tests/stress/symbol-seal-and-freeze.js

   1 // This tests Object.seal and Object.freeze affect on Symbol properties.
   2
   3 var object = {
   4     [Symbol.iterator]: 42
   5 };
   6
   7 if (!object.hasOwnProperty(Symbol.iterator))
   8     throw "Error: object doesn't have Symbol.iterator";
   9 if (JSON.stringify(Object.getOwnPropertyDescriptor(object, Symbol.iterator)) !== '{"value":42,"writable":true,"enumerable":true,"configurable":true}')
  10     throw "Error: bad property descriptor " + JSON.stringify(Object.getOwnPropertyDescriptor(object, Symbol.iterator));
  11 if (Object.getOwnPropertySymbols(object).length !== 1)
  12     throw "Error: bad value " + Object.getOwnPropertySymbols(object).length;
  13 if (Object.getOwnPropertySymbols(object)[0] !== Symbol.iterator)
  14     throw "Error: bad value " + String(Object.getOwnPropertySymbols(object)[0]);
  15
  16 Object.seal(object);
  17 if (!object.hasOwnProperty(Symbol.iterator))
  18     throw "Error: object doesn't have Symbol.iterator";
  19 if (JSON.stringify(Object.getOwnPropertyDescriptor(object, Symbol.iterator)) !== '{"value":42,"writable":true,"enumerable":true,"configurable":false}')
  20     throw "Error: bad property descriptor " + JSON.stringify(Object.getOwnPropertyDescriptor(object, Symbol.iterator));
  21
  22 Object.freeze(object);
  23 if (!object.hasOwnProperty(Symbol.iterator))
  24     throw "Error: object doesn't have Symbol.iterator";
  25 if (JSON.stringify(Object.getOwnPropertyDescriptor(object, Symbol.iterator)) !== '{"value":42,"writable":false,"enumerable":true,"configurable":false}')
  26     throw "Error: bad property descriptor " + JSON.stringify(Object.getOwnPropertyDescriptor(object, Symbol.iterator));