stringify-boxed-primitives.js

Enable keyboard shortcuts

// Any copyright is dedicated to the Public Domain.

// http://creativecommons.org/licenses/publicdomain/

var gTestfile = 'stringify-boxed-primitives.js';

//-----------------------------------------------------------------------------

var BUGNUMBER = 584909;

var summary = "Stringification of Boolean/String/Number objects";

print(BUGNUMBER + ": " + summary);

/**************

 * BEGIN TEST *

 **************/

function redefine(obj, prop, fun)

  var desc =

    { value: fun, writable: true, configurable: true, enumerable: false };

  Object.defineProperty(obj, prop, desc);

assertEq(JSON.stringify(new Boolean(false)), "false");

assertEq(JSON.stringify(new Number(5)), "5");

assertEq(JSON.stringify(new String("foopy")), '"foopy"');

var numToString = Number.prototype.toString;

var numValueOf = Number.prototype.valueOf;

var objToString = Object.prototype.toString;

var objValueOf = Object.prototype.valueOf;

var boolToString = Boolean.prototype.toString;

var boolValueOf = Boolean.prototype.valueOf;

redefine(Boolean.prototype, "toString", function() { return 17; });

assertEq(JSON.stringify(new Boolean(false)), "false")

delete Boolean.prototype.toString;

assertEq(JSON.stringify(new Boolean(false)), "false");

delete Object.prototype.toString;

assertEq(JSON.stringify(new Boolean(false)), "false");

delete Boolean.prototype.valueOf;

assertEq(JSON.stringify(new Boolean(false)), "false");

delete Object.prototype.valueOf;

assertEq(JSON.stringify(new Boolean(false)), "false");

redefine(Boolean.prototype, "toString", boolToString);

redefine(Boolean.prototype, "valueOf", boolValueOf);

redefine(Object.prototype, "toString", objToString);

redefine(Object.prototype, "valueOf", objValueOf);

redefine(Number.prototype, "toString", function() { return 42; });

assertEq(JSON.stringify(new Number(5)), "5");

redefine(Number.prototype, "valueOf", function() { return 17; });

assertEq(JSON.stringify(new Number(5)), "17");

delete Number.prototype.toString;

assertEq(JSON.stringify(new Number(5)), "17");

delete Number.prototype.valueOf;

assertEq(JSON.stringify(new Number(5)), "null"); // isNaN(Number("[object Number]"))

delete Object.prototype.toString;

try

  JSON.stringify(new Number(5));

  throw new Error("didn't throw");

catch (e)

  assertEq(e instanceof TypeError, true,

           "ToNumber failure, should throw TypeError");

delete Object.prototype.valueOf;

try

  JSON.stringify(new Number(5));

  throw new Error("didn't throw");

catch (e)

  assertEq(e instanceof TypeError, true,

           "ToNumber failure, should throw TypeError");

redefine(Number.prototype, "toString", numToString);

redefine(Number.prototype, "valueOf", numValueOf);

redefine(Object.prototype, "toString", objToString);

redefine(Object.prototype, "valueOf", objValueOf);

redefine(String.prototype, "valueOf", function() { return 17; });

assertEq(JSON.stringify(new String(5)), '"5"');

redefine(String.prototype, "toString", function() { return 42; });

assertEq(JSON.stringify(new String(5)), '"42"');

delete String.prototype.toString;

assertEq(JSON.stringify(new String(5)), '"[object String]"');

delete Object.prototype.toString;

assertEq(JSON.stringify(new String(5)), '"17"');

delete String.prototype.valueOf;

try

  JSON.stringify(new String(5));

  throw new Error("didn't throw");

catch (e)

  assertEq(e instanceof TypeError, true,

           "ToString failure, should throw TypeError");

delete Object.prototype.valueOf;

try

  JSON.stringify(new String(5));

  throw new Error("didn't throw");

catch (e)

  assertEq(e instanceof TypeError, true,

           "ToString failure, should throw TypeError");

/******************************************************************************/

if (typeof reportCompare === "function")

  reportCompare(true, true);

print("All tests passed!");