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polyfill.test.js
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polyfill.test.js
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import { Int8Array, Float32Array } from "./polyfill.js";
describe("ArrayBufferView-Stride-Polyfill w/ Int8Array", function () {
it("exists", function () {
expect(Int8Array).to.be.a("function");
});
it("behaves like a normal ArrayBuffer view for creating new buffers", function () {
const view = new Int8Array([0, 1, 2, 3]);
expect([...view]).to.deep.equal([0, 1, 2, 3]);
expect(view.length).to.equal(4);
expect(view.byteLength).to.equal(4);
view[0] = 5;
expect([...view]).to.deep.equal([5, 1, 2, 3]);
view[3] = 5;
expect([...view]).to.deep.equal([5, 1, 2, 5]);
});
it("behaves like a normal ArrayBuffer view for creating new views on existing buffers", function () {
const buffer = new Int8Array([0, 1, 2, 3, 4, 5, 6, 7]).buffer;
let view;
view = new Int8Array(buffer);
expect(view.length).to.equal(8);
expect(view.byteLength).to.equal(8);
expect([...view]).to.deep.equal([0, 1, 2, 3, 4, 5, 6, 7]);
view = new Int8Array(buffer, 4);
expect(view.length).to.equal(4);
expect(view.byteLength).to.equal(4);
expect([...view]).to.deep.equal([4, 5, 6, 7]);
view = new Int8Array(buffer, 2, 3);
expect(view.length).to.equal(3);
expect(view.byteLength).to.equal(3);
expect([...view]).to.deep.equal([2, 3, 4]);
expect(view.buffer).to.equal(buffer);
});
it("can create views with a stride", function () {
const main = new Int8Array([0, 0, 1, 1, 2, 2, 3, 3]);
const view = new Int8Array(main.buffer, 0, 4, 2);
expect(view.length).to.equal(4);
expect(view.byteLength).to.equal(4);
expect(view[0]).to.equal(0);
expect(view[1]).to.equal(1);
expect(view[2]).to.equal(2);
expect(view[3]).to.equal(3);
expect(view.stride).to.equal(2);
expect(view.buffer).to.equal(main.buffer);
view[0] = 5;
expect([...view]).to.deep.equal([5, 1, 2, 3]);
expect([...main]).to.deep.equal([5, 0, 1, 1, 2, 2, 3, 3]);
view[3] = 5;
expect([...view]).to.deep.equal([5, 1, 2, 5]);
expect([...main]).to.deep.equal([5, 0, 1, 1, 2, 2, 5, 3]);
});
it("can handle iterators", function () {
const buffer = new Int8Array([0, 0, 1, 1, 2, 2, 3, 3]).buffer;
const view = new Int8Array(buffer, 0, 4, 2);
expect(view.length).to.equal(4);
expect(view.byteLength).to.equal(4);
expect([...view]).to.deep.equal([0, 1, 2, 3]);
expect(view.buffer).to.equal(buffer);
});
it("can handle async iterators", async function () {
const buffer = new Int8Array([0, 0, 1, 1, 2, 2, 3, 3]).buffer;
const view = new Int8Array(buffer, 0, 4, 2);
const copy = [];
for await (const v of view) {
copy.push(v);
}
expect([...view]).to.deep.equal(copy);
});
});
describe("ArrayBufferView-Stride-Polyfill w/ Float32Array", function () {
it("can create views with a stride", function () {
const buffer = new Float32Array([0, 0, 1, 1, 2, 2, 3, 3]).buffer;
const view = new Float32Array(buffer, 0, 4, 2);
expect(view.length).to.equal(4);
expect(view.byteLength).to.equal(16);
expect(view[0]).to.equal(0);
expect(view[1]).to.equal(1);
expect(view[2]).to.equal(2);
expect(view[3]).to.equal(3);
expect(view.buffer).to.equal(buffer);
});
it("can handle iterators", function () {
const buffer = new Float32Array([0, 0, 1, 1, 2, 2, 3, 3]).buffer;
const view = new Float32Array(buffer, 0, 4, 2);
expect(view.length).to.equal(4);
expect(view.byteLength).to.equal(16);
expect(view.buffer.byteLength).to.equal(32);
expect(view.buffer).to.equal(buffer);
expect([...view]).to.deep.equal([0, 1, 2, 3]);
});
it("can handle slice for copying", function () {
const buffer = new Float32Array([0, 0, 1, 1, 2, 2, 3, 3]).buffer;
const view = new Float32Array(buffer, 0, 4, 2).slice();
expect(view.length).to.equal(4);
expect(view.byteLength).to.equal(16);
expect(view.buffer).to.not.equal(buffer);
expect(view.buffer.byteLength).to.equal(16);
expect([...view]).to.deep.equal([0, 1, 2, 3]);
});
it("can handle slice for slicing", function () {
const buffer = new Float32Array([0, 0, 1, 1, 2, 2, 3, 3]).buffer;
const view = new Float32Array(buffer, 0, 4, 2).slice(1, -1);
expect(view.length).to.equal(2);
expect(view.byteLength).to.equal(8);
expect(view.buffer).to.not.equal(buffer);
expect(view.buffer.byteLength).to.equal(8);
expect([...view]).to.deep.equal([1, 2]);
});
it("can handle set", function () {
const main = new Float32Array([0, 0, 1, 1, 2, 2, 3, 3])
const view = new Float32Array(main.buffer, 0, 4, 2);
view.set([4, 5, 6, 7]);
expect(view.length).to.equal(4);
expect(view.byteLength).to.equal(16);
expect(view.buffer).to.equal(main.buffer);
expect(view.buffer.byteLength).to.equal(32);
expect([...view]).to.deep.equal([4, 5, 6, 7]);
expect([...main]).to.deep.equal([4, 0, 5, 1, 6, 2, 7, 3]);
});
it("can handle set w/ offset", function () {
const main = new Float32Array([0, 0, 1, 1, 2, 2, 3, 3])
const view = new Float32Array(main.buffer, 0, 4, 2);
view.set([4, 5], 2);
expect(view.length).to.equal(4);
expect(view.byteLength).to.equal(16);
expect(view.buffer).to.equal(main.buffer);
expect(view.buffer.byteLength).to.equal(32);
expect([...view]).to.deep.equal([0, 1, 4, 5]);
expect([...main]).to.deep.equal([0, 0, 1, 1, 4, 2, 5, 3]);
});
it("can handle map", function () {
const buffer = new Float32Array([0, 0, 1, 1, 2, 2, 3, 3]).buffer;
const view = new Float32Array(buffer, 0, 4, 2).map(v => v + 1)
expect(view.length).to.equal(4);
expect(view.byteLength).to.equal(16);
expect(view.buffer).to.not.equal(buffer);
expect(view.buffer.byteLength).to.equal(16);
expect([...view]).to.deep.equal([1, 2, 3, 4]);
});
it("can handle filter", function () {
const buffer = new Float32Array([0, 0, 1, 1, 2, 2, 3, 3]).buffer;
const view = new Float32Array(buffer, 0, 4, 2).filter(v => v % 2 === 0)
expect(view.length).to.equal(2);
expect(view.byteLength).to.equal(8);
expect(view.buffer).to.not.equal(buffer);
expect(view.buffer.byteLength).to.equal(8);
expect([...view]).to.deep.equal([0, 2]);
});
});