test262/test/suite/chapter15/15.2/15.2.3/15.2.3.6/15.2.3.6-4-13.js

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/**
 * Step 4 of defineProperty calls the [[DefineOwnProperty]] internal method
 * of O to define the property. For non-configurable properties, step 9a of
 * [[DefineOwnProperty]] rejects changing the kind of a property.
 *
 * @path chapter15/15.2/15.2.3/15.2.3.6/15.2.3.6-4-13.js
 * @description Object.defineProperty throws TypeError when changing non-configurable accessor properties to data 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, configurable: false };
  Object.defineProperty(o, "foo", d1);

  // changing "foo" to be a data property should fail, since [[Configurable]]
  // on the original property will be false.
  var desc = { value: 101 };

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