JSTests/test262/test/built-ins/Number/prototype/S15.7.3.1_A2_T1.js

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

/*---
info: Number.prototype is itself Number object
es5id: 15.7.3.1_A2_T1
description: >
    Checking type of Number.prototype property - test based on
    deleting Number.prototype.toString
---*/

//CHECK#1
if (typeof Number.prototype !== "object") {
  $ERROR('#1: typeof Number.prototype === "object"');
}

delete Number.prototype.toString;

if (Number.prototype.toString() !== "[object Number]") {
  $ERROR('#3: The [[Class]] property of the Number prototype object is set to "Number"');
}