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// Copyright Joyent, Inc. and other Node contributors.
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/*
* Tests to verify slice functionality of ArrayBuffer.
* (http://www.khronos.org/registry/typedarray/specs/latest/#5)
*/
var common = require('../common');
var assert = require('assert');
var buffer = new ArrayBuffer(8);
var sub;
var i;
for (var i = 0; i < 8; i++) {
buffer[i] = i;
}
// slice a copy of buffer
sub = buffer.slice(2, 6);
// make sure it copied correctly
assert.ok(sub instanceof ArrayBuffer);
assert.equal(sub.byteLength, 4);
for (i = 0; i < 4; i++) {
assert.equal(sub[i], i+2);
}
// modifications to the new slice shouldn't affect the original
sub[0] = 999;
for (i = 0; i < 8; i++) {
assert.equal(buffer[i], i);
}
// test optional end param
sub = buffer.slice(5);
assert.ok(sub instanceof ArrayBuffer);
assert.equal(sub.byteLength, 3);
for (i = 0; i < 3; i++) {
assert.equal(sub[i], i+5);
}
// test clamping
sub = buffer.slice(-3, -1);
assert.ok(sub instanceof ArrayBuffer);
assert.equal(sub.byteLength, 2);
for (i = 0; i < 2; i++) {
assert.equal(sub[i], i+5);
}
// test invalid clamping range
sub = buffer.slice(-1, -3);
assert.ok(sub instanceof ArrayBuffer);
assert.equal(sub.byteLength, 0);
// test wrong number of arguments
var gotError = false;
try {
sub = buffer.slice();
} catch (e) {
gotError = true;
}
assert.ok(gotError);