primitive-this-boxing-behavior.js

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// Any copyright is dedicated to the Public Domain.

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

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

var BUGNUMBER = 732669;

var summary = "Primitive values don't box correctly";

print(BUGNUMBER + ": " + summary);

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

 * BEGIN TEST *

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

var t;

function returnThis() { return this; }

// Boolean

Boolean.prototype.method = returnThis;

t = true.method();

assertEq(t !== Boolean.prototype, true);

assertEq(t.toString(), "true");

Object.defineProperty(Boolean.prototype, "property", { get: returnThis, configurable: true });

t = false.property;

assertEq(t !== Boolean.prototype, true);

assertEq(t.toString(), "false");

delete Boolean.prototype.method;

delete Boolean.prototype.property;

// Number

Number.prototype.method = returnThis;

t = 5..method();

assertEq(t !== Number.prototype, true);

assertEq(t.toString(), "5");

Object.defineProperty(Number.prototype, "property", { get: returnThis, configurable: true });

t = 17..property;

assertEq(t !== Number.prototype, true);

assertEq(t.toString(), "17");

delete Number.prototype.method;

delete Number.prototype.property;

// String

String.prototype.method = returnThis;

t = "foo".method();

assertEq(t !== String.prototype, true);

assertEq(t.toString(), "foo");

Object.defineProperty(String.prototype, "property", { get: returnThis, configurable: true });

t = "bar".property;

assertEq(t !== String.prototype, true);

assertEq(t.toString(), "bar");

delete String.prototype.method;

delete String.prototype.property;

// Object

Object.prototype.method = returnThis;

t = true.method();

assertEq(t !== Object.prototype, true);

assertEq(t !== Boolean.prototype, true);

assertEq(t.toString(), "true");

t = 42..method();

assertEq(t !== Object.prototype, true);

assertEq(t !== Number.prototype, true);

assertEq(t.toString(), "42");

t = "foo".method();

assertEq(t !== Object.prototype, true);

assertEq(t !== String.prototype, true);

assertEq(t.toString(), "foo");

Object.defineProperty(Object.prototype, "property", { get: returnThis, configurable: true });

t = false.property;

assertEq(t !== Object.prototype, true);

assertEq(t !== Boolean.prototype, true);

assertEq(t.toString(), "false");

t = 8675309..property;

assertEq(t !== Object.prototype, true);

assertEq(t !== Number.prototype, true);

assertEq(t.toString(), "8675309");

t = "bar".property;

assertEq(t !== Object.prototype, true);

assertEq(t !== String.prototype, true);

assertEq(t.toString(), "bar");

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

if (typeof reportCompare === "function")

  reportCompare(true, true);

print("Tests complete");