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

// Copyright (C) Microsoft. All rights reserved.

// Licensed under the MIT license. See LICENSE.txt file in the project root for full license information.

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

// Verifies TypedArray builtin properties

if (this.WScript && this.WScript.LoadScriptFile) { // Check for running in ch

this.WScript.LoadScriptFile("..\\UnitTestFramework\\UnitTestFramework.js");

}

function mangle(u8) {

u8.length = -2;

u8.byteLength = 2000;

u8.byteOffset = 45;

u8.buffer = 25;

u8.BYTES_PER_ELEMENT = 4;

}

var tests = [

{

name: "TypedArray builtin properties can't be overwritten, but writing to them does not throw an error",

body: function () {

var arr = new ArrayBuffer(100);

var u8 = new Uint8Array(arr, 90);

for (var i = 0; i < u8.length; i++) {

u8[i] = i;

}

mangle(u8);

assert.areEqual(10, u8.length, "Writing to length has no effect");

assert.areEqual(10, u8.byteLength, "Writing to byteLength has no effect");

assert.areEqual(90, u8.byteOffset, "Writing to byteOffset has no effect");

assert.areEqual(1, u8.BYTES_PER_ELEMENT, "Writing to BYTES_PER_ELEMENT has no effect");

assert.isTrue(arr === u8.buffer, "Writing to buffer has no effect");

assert.throws(function() { Array.prototype.splice.call(u8, 4, 3, 1, 2, 3, 4, 5); }, TypeError, "Array.prototype.splice tries to set the length property of the TypedArray object which will throw", "Cannot define property: object is not extensible");

assert.areEqual(10, u8.length, "Array.prototype.splice throws when it tries to set the length property");

assert.areEqual(10, u8.byteLength, "The byteLength property should not be changed");

assert.areEqual([0,1,2,3,1,2,3,4,5,7], u8, "After splice, array has correct values - NOTE: last two values are gone from the array");

assert.throws(function() { Array.prototype.push.call(u8, 100); }, TypeError, "Array.prototype.push tries to set the length property of the TypedArray object which will throw", "Cannot define property: object is not extensible");

assert.areEqual([0,1,2,3,1,2,3,4,5,7], u8, "Array.prototype.push doesn't modify the TypedArray");

}

}

];

testRunner.runTests(tests);