src/third_party/mozjs-45/js/src/tests/test262/ch11/11.4/11.4.1/11.4.1-4.a-12.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-12.js
 * @description delete operator returns false when deleting a property(length)
 */


function testcase() {

  var a = [1,2,3]
  a.x = 10;
  var d = delete a.length
  if(d === false && a.length === 3)
    return true;
 }
runTestCase(testcase);