JSTests/test262/test/built-ins/String/prototype/trim/15.5.4.20-2-43.js

// Copyright (c) 2012 Ecma International.  All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
es5id: 15.5.4.20-2-43
description: >
    String.prototype.trim - 'this' is an object with an own valueOf
    and inherited toString methods with hint string, verify inherited
    toString method will be called first
---*/

var toStringAccessed = false;
var valueOfAccessed = false;

var proto = {
  toString: function() {
    toStringAccessed = true;
    return "abc";
  }
};

var Con = function() {};
Con.prototype = proto;

var child = new Con();
child.valueOf = function() {
  valueOfAccessed = true;
  return "efg";
};

assert.sameValue(String.prototype.trim.call(child), "abc", 'String.prototype.trim.call(child)');
assert(toStringAccessed, 'toStringAccessed !== true');
assert.sameValue(valueOfAccessed, false, 'valueOfAccessed');