src/third_party/mozjs-45/js/src/tests/test262/ch11/11.4/11.4.1/11.4.4-4.a-3-s.js

/// Copyright (c) 2012 Ecma International.  All rights reserved. 
/// Ecma International makes this code available under the terms and conditions set
/// forth on http://hg.ecmascript.org/tests/test262/raw-file/tip/LICENSE (the 
/// "Use Terms").   Any redistribution of this code must retain the above 
/// copyright and this notice and otherwise comply with the Use Terms.
/**
 * This test is actually testing the [[Delete]] internal method (8.12.8). Since the
 * language provides no way to directly exercise [[Delete]], the tests are placed here.
 *
 * @path ch11/11.4/11.4.1/11.4.4-4.a-3-s.js
 * @description delete operator throws TypeError when deleting a non-configurable data property in strict mode
 * @onlyStrict
 */


function testcase() {
  'use strict';

  var o = {};
  var desc = { value : 1 }; // all other attributes default to false
  Object.defineProperty(o, "foo", desc);
  
  // Now, deleting o.foo should throw TypeError because [[Configurable]] on foo is false.
  try {
    delete o.foo;
    return false;
  }
  catch (e) {
    return (e instanceof TypeError);
  }
 }
runTestCase(testcase);