test262/test/suite/chapter15/15.2/15.2.3/15.2.3.6/15.2.3.6-4-11.js

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/**
 * Step 4 of defineProperty calls the [[DefineOwnProperty]] internal method
 * of O to define the property. Step 7b of [[DefineOwnProperty]] rejects if
 * current.[[Enumerable]] and desc.[[Enumerable]] are the boolean negations
 * of each other.
 *
 * @path chapter15/15.2/15.2.3/15.2.3.6/15.2.3.6-4-11.js
 * @description Object.defineProperty throws TypeError when changing [[Enumerable]] from true to false on non-configurable accessor properties
 */


function testcase() {
  var o = {};

  // create an accessor property; all other attributes default to false.
  // dummy getter
  var getter = function () { return 1; }
  var d1 = { get: getter, enumerable: true, configurable: false };
  Object.defineProperty(o, "foo", d1);

  // now, setting enumerable to true should fail, since [[Configurable]]
  // on the original property will be false.
  var desc = { get: getter, enumerable: false };

  try {
    Object.defineProperty(o, "foo", desc);
  }
  catch (e) {
    if (e instanceof TypeError) {
      // the property should remain unchanged.
      var d2 = Object.getOwnPropertyDescriptor(o, "foo");
      if (d2.get === getter &&
          d2.enumerable === true &&
          d2.configurable === false) {
        return true;
      }
    }
  }
 }
runTestCase(testcase);