test262/test/suite/ch11/11.4/11.4.1/11.4.1-4.a-5.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 ch11/11.4/11.4.1/11.4.1-4.a-5.js
 * @description delete operator returns false when deleting the environment object inside 'with'
 */


function testcase() {
  var o = new Object();
  o.x = 1;
  var d;
  with(o)
  {
    d = delete o;
  }
  if (d === false && typeof(o) === 'object' && o.x === 1) {
    return true;
  }
  return false;
 }
runTestCase(testcase);