import { describe, expect, test } from "vitest";
import { ConstDataView, parse, serialize, sizeofHead } from "../src";
import { expectDataViewEqual } from ".";
import { filledDataView } from "../src";

describe(ConstDataView.name, () => {
  test('serialize', () => {
    const expected = filledDataView([0x00, 0x00, 0x01, 0x02, 0x00, 0x00])
    const dv = filledDataView([0x01, 0x02])

    const buffer = new ArrayBuffer(6)
    let actual = new DataView(buffer, 2, 1)
    expect(() => serialize(actual, dv, ConstDataView(2))).toThrow()

    actual = new DataView(buffer, 2, 2)

    expect(() => serialize(actual, dv, ConstDataView(1))).toThrow()

    serialize(actual, dv, ConstDataView(2))
    expectDataViewEqual(new DataView(actual.buffer), expected)
  })

  test('parse', () => {
    const expected = filledDataView([0x01, 0x02])
    const dv = filledDataView([0x00, 0x00, 0x01, 0x02, 0x00, 0x00])
    const frame = new DataView(dv.buffer, dv.byteOffset + 2, 2)
    const actual = parse(frame, ConstDataView(2))
    expectDataViewEqual(actual, expected)
  })

  test('sizeof', () => {
    expect(sizeofHead(ConstDataView(2))).toEqual(2)
  })
})