src/third_party/mozjs-45/js/src/tests/test262/ch11/11.3/11.3.1/S11.3.1_A4_T3.js

// Copyright 2009 the Sputnik authors.  All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/**
 * Operator x++ returns ToNumber(x)
 *
 * @path ch11/11.3/11.3.1/S11.3.1_A4_T3.js
 * @description Type(x) is string primitive or String object
 */

//CHECK#1
var x = "1";
var y = x++;
if (y !== 1) {
  $ERROR('#1: var x = "1"; var y = x++; y === 1. Actual: ' + (y));
}

//CHECK#2
var x = "x";
var y = x++; 
if (isNaN(y) !== true) {
  $ERROR('#2: var x = "x"; var y = x++; y === Not-a-Number. Actual: ' + (y));
}

//CHECK#3
var x = new String("-1"); 
var y = x++;
if (y !== -1) {
  $ERROR('#3: var x = new String("-1"); var y = x++; y === -1. Actual: ' + (y));
}