src/third_party/mozjs-45/js/src/tests/test262/ch08/8.12/8.12.4/8.14.4-8-b_1.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.
/**
 * @path ch08/8.12/8.12.4/8.14.4-8-b_1.js
 * @description Non-writable property on a prototype written to.
 */

function testcase() {   
    function foo() {};
    Object.defineProperty(foo.prototype, "bar", {value: "unwritable"}); 
    
    var o = new foo(); 
    o.bar = "overridden"; 
    return o.hasOwnProperty("bar")===false && o.bar==="unwritable";
}
runTestCase(testcase);