import chai, { expect } from "chai";
import "mocha";
import concatBytes from "./concatBytes";
import chaiArrays = require("chai-arrays");

chai.use(chaiArrays);

describe("concatBytes", () => {
  it("should concatenate underlying ArrayBuffer bytes of various typed arrays", () => {
    const res = concatBytes([
      new Uint8Array([1, 2, 3]),
      new Uint8Array([4, 5, 6]),
      new ArrayBuffer(1),
      [7, 8, 9],
      new Uint16Array([10, 11, 12]),
      new Uint32Array([13]),
      new DataView(new Int16Array([-1]).buffer).buffer,
      [256, 257, 511, 512, 513],
      new Int32Array(),
      new Int32Array([-1, -2, 0]),
      [],
      Buffer.from([31, 42, 53]),
      new Uint8Array(new Uint8Array([0, 1, 2, 3, 4]).buffer, 2, 2),
    ]);

    // WARNING: The byte order is platform dependent, but this test assumes LE!
    expect([...new Uint8Array(res)]).to.be.equalTo([
      1, 2, 3, 4, 5, 6, 0, 7, 8, 9, 10, 0, 11, 0, 12, 0, 13, 0, 0, 0, 255, 255,
      0, 1, 255, 0, 1, 255, 255, 255, 255, 254, 255, 255, 255, 0, 0, 0, 0, 31,
      42, 53, 2, 3,
    ]);
  });
});