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import assert from "assert";import { encode, decode, ExtData } from "../src";
function seq(n: number) {  const a: Array<number> = [];  for (let i = 0; i < n; i++) {    a.push((i + 1) % 0xff);  }  return Uint8Array.from(a);}
describe("msgpack-ext", () => {  const SPECS = {    FIXEXT1: [0xd4, new ExtData(0, seq(1))],    FIXEXT2: [0xd5, new ExtData(0, seq(2))],    FIXEXT4: [0xd6, new ExtData(0, seq(4))],    FIXEXT8: [0xd7, new ExtData(0, seq(8))],    FIXEXT16: [0xd8, new ExtData(0, seq(16))],    EXT8: [0xc7, new ExtData(0, seq(17))],    EXT16: [0xc8, new ExtData(0, seq(0x100))],    EXT32: [0xc9, new ExtData(0, seq(0x10000))],  } as Record<string, [number, ExtData]>;
  for (const name of Object.keys(SPECS)) {    const [msgpackType, extData] = SPECS[name]!;
    it(`preserves ExtData by decode(encode(${name}))`, () => {      const encoded = encode(extData);      assert.strictEqual(encoded[0], msgpackType);      assert.deepStrictEqual(decode(encoded), extData);    });  }});