slice-buffer.js
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/*
* Test dependencies
*/
var sliceBuffer = require('../index.js');
var expect = require('expect.js');
/**
* Tests
*/
describe('sliceBuffer', function() {
describe('using standard slice', function() {
it('should slice correctly with only start provided', function() {
var abv = new Uint8Array(10);
for (var i = 0; i < abv.length; i++) {
abv[i] = i;
}
var sliced = sliceBuffer(abv.buffer, 3);
var sabv = new Uint8Array(sliced);
for (var i = 3, ii = 0; i < abv.length; i++, ii++) {
expect(abv[i]).to.equal(sabv[ii]);
}
});
it('should slice correctly with start and end provided', function() {
var abv = new Uint8Array(10);
for (var i = 0; i < abv.length; i++) {
abv[i] = i;
}
var sliced = sliceBuffer(abv.buffer, 3, 8);
var sabv = new Uint8Array(sliced);
for (var i = 3, ii = 0; i < 8; i++, ii++) {
expect(abv[i]).to.equal(sabv[ii]);
}
});
it('should slice correctly with negative start', function() {
var abv = new Uint8Array(10);
for (var i = 0; i < abv.length; i++) {
abv[i] = i;
}
var sliced = sliceBuffer(abv.buffer, -3);
var sabv = new Uint8Array(sliced);
for (var i = abv.length - 3, ii = 0; i < abv.length; i++, ii++) {
expect(abv[i]).to.equal(sabv[ii]);
}
});
it('should slice correctly with negative end', function() {
var abv = new Uint8Array(10);
for (var i = 0; i < abv.length; i++) {
abv[i] = i;
}
var sliced = sliceBuffer(abv.buffer, 0, -3);
var sabv = new Uint8Array(sliced);
for (var i = 0, ii = 0; i < abv.length - 3; i++, ii++) {
expect(abv[i]).to.equal(sabv[ii]);
}
});
it('should slice correctly with negative start and end', function() {
var abv = new Uint8Array(10);
for (var i = 0; i < abv.length; i++) {
abv[i] = i;
}
var sliced = sliceBuffer(abv.buffer, -6, -3);
var sabv = new Uint8Array(sliced);
for (var i = abv.length - 6, ii = 0; i < abv.length - 3; i++, ii++) {
expect(abv[i]).to.equal(sabv[ii]);
}
});
it('should slice correctly with equal start and end', function() {
var abv = new Uint8Array(10);
for (var i = 0; i < abv.length; i++) {
abv[i] = i;
}
var sliced = sliceBuffer(abv.buffer, 1, 1);
expect(sliced.byteLength).to.equal(0);
});
it('should slice correctly when end larger than buffer', function() {
var abv = new Uint8Array(10);
for (var i = 0; i < abv.length; i++) {
abv[i] = i;
}
var sliced = sliceBuffer(abv.buffer, 0, 100);
expect(new Uint8Array(sliced)).to.eql(abv);
});
it('shoud slice correctly when start larger than end', function() {
var abv = new Uint8Array(10);
for (var i = 0; i < abv.length; i++) {
abv[i] = i;
}
var sliced = sliceBuffer(abv.buffer, 6, 5);
expect(sliced.byteLength).to.equal(0);
});
});
describe('using fallback', function() {
it('should slice correctly with only start provided', function() {
var abv = new Uint8Array(10);
for (var i = 0; i < abv.length; i++) {
abv[i] = i;
}
var ab = abv.buffer;
ab.slice = undefined;
var sliced = sliceBuffer(ab, 3);
var sabv = new Uint8Array(sliced);
for (var i = 3, ii = 0; i < abv.length; i++, ii++) {
expect(abv[i]).to.equal(sabv[ii]);
}
});
it('should slice correctly with start and end provided', function() {
var abv = new Uint8Array(10);
for (var i = 0; i < abv.length; i++) {
abv[i] = i;
}
var ab = abv.buffer;
ab.slice = undefined;
var sliced = sliceBuffer(ab, 3, 8);
var sabv = new Uint8Array(sliced);
for (var i = 3, ii = 0; i < 8; i++, ii++) {
expect(abv[i]).to.equal(sabv[ii]);
}
});
it('should slice correctly with negative start', function() {
var abv = new Uint8Array(10);
for (var i = 0; i < abv.length; i++) {
abv[i] = i;
}
var ab = abv.buffer;
ab.slice = undefined;
var sliced = sliceBuffer(ab, -3);
var sabv = new Uint8Array(sliced);
for (var i = abv.length - 3, ii = 0; i < abv.length; i++, ii++) {
expect(abv[i]).to.equal(sabv[ii]);
}
});
it('should slice correctly with negative end', function() {
var abv = new Uint8Array(10);
for (var i = 0; i < abv.length; i++) {
abv[i] = i;
}
var ab = abv.buffer;
ab.slice = undefined;
var sliced = sliceBuffer(ab, 0, -3);
var sabv = new Uint8Array(sliced);
for (var i = 0, ii = 0; i < abv.length - 3; i++, ii++) {
expect(abv[i]).to.equal(sabv[ii]);
}
});
it('should slice correctly with negative start and end', function() {
var abv = new Uint8Array(10);
for (var i = 0; i < abv.length; i++) {
abv[i] = i;
}
var ab = abv.buffer;
ab.slice = undefined;
var sliced = sliceBuffer(ab, -6, -3);
var sabv = new Uint8Array(sliced);
for (var i = abv.length - 6, ii = 0; i < abv.length - 3; i++, ii++) {
expect(abv[i]).to.equal(sabv[ii]);
}
});
it('should slice correctly with equal start and end', function() {
var abv = new Uint8Array(10);
for (var i = 0; i < abv.length; i++) {
abv[i] = i;
}
var ab = abv.buffer;
ab.slice = undefined;
var sliced = sliceBuffer(ab, 1, 1);
expect(sliced.byteLength).to.equal(0);
});
it('should slice correctly when end larger than buffer', function() {
var abv = new Uint8Array(10);
for (var i = 0; i < abv.length; i++) {
abv[i] = i;
}
var ab = abv.buffer;
ab.slice = undefined;
var sliced = sliceBuffer(ab, 0, 100);
var sabv = new Uint8Array(sliced);
for (var i = 0; i < abv.length; i++) {
expect(abv[i]).to.equal(sabv[i]);
}
});
it('shoud slice correctly when start larger than end', function() {
var abv = new Uint8Array(10);
for (var i = 0; i < abv.length; i++) {
abv[i] = i;
}
var ab = abv.buffer;
ab.slice = undefined;
var sliced = sliceBuffer(ab, 6, 5);
expect(sliced.byteLength).to.equal(0);
});
});
});