import { describe, expect, test } from "bun:test";
import { decode, encode } from "./protocol";

describe("protocol", () => {
  test("encode produces valid json", () => {
    const msg = { type: "sync" as const, data: [1, 2, 3] };
    const encoded = encode(msg);
    expect(JSON.parse(encoded)).toEqual(msg);
  });

  test("decode parses valid json", () => {
    const msg = { type: "join" as const, room: "test" };
    const decoded = decode(JSON.stringify(msg));
    expect(decoded).toEqual(msg);
  });

  test("decode returns null for invalid json", () => {
    expect(decode("not json")).toBeNull();
    expect(decode("{broken")).toBeNull();
  });
});