syncer/packages/shared/test/movers.test.mjs

import assert from "node:assert/strict";
import test from "node:test";
import {
  FURNITURE,
  MOVERS_BOT_IDS,
  MOVERS_PHYSICS_BACKEND,
  MOVERS_SNAPSHOT_RATE,
  MOVERS_TICK_RATE,
  moversGame,
} from "../dist/index.js";

function inputPacket(sequence, targetTick, input = {}) {
  return {
    sequence,
    targetTick,
    observedTick: Math.max(0, targetTick - 1),
    input: {
      forward: 0,
      strafe: 0,
      sprint: false,
      grab: false,
      throwItem: false,
      closeDoors: false,
      ...input,
    },
  };
}

test("Bad Movers is a fourth complete game built through defineMultiplayerGame", () => {
  assert.equal(moversGame.tickRateHz, MOVERS_TICK_RATE);
  assert.equal(moversGame.snapshotRateHz, MOVERS_SNAPSHOT_RATE);
  const server = moversGame.createServer();
  assert.equal(server.currentState.players.filter((player) => player.bot).length, MOVERS_BOT_IDS.length);
  assert.equal(server.currentState.furniture.length, Object.keys(FURNITURE).length);
  assert.deepEqual(MOVERS_PHYSICS_BACKEND, {
    name: "Box3D",
    version: "0.1.0",
    bindingVersion: "0.2.0",
    runtime: "WebAssembly SIMD",
    solver: "single-threaded deterministic",
    subSteps: 4,
  });

  server.addPlayer(1);
  server.addPlayer(2);
  assert.equal(server.currentState.players.find((player) => player.id === 1).team, "yellow");
  assert.equal(server.currentState.players.find((player) => player.id === 2).team, "blue");
});

test("real Box3D gravity advances full 3D furniture transforms", () => {
  const server = moversGame.createServer();
  const box = server.currentState.furniture.find((item) => item.kind === "mystery-box");
  Object.assign(box, {
    x: 0,
    y: 8,
    z: 0,
    velocityX: 0,
    velocityY: 0,
    velocityZ: 0,
  });
  for (let tick = 0; tick < 12; tick += 1) server.step();
  assert.ok(box.y < 7, `expected Box3D gravity to drop the box, got y=${box.y}`);
  assert.ok(box.velocityY < 0);
  assert.ok(Number.isFinite(box.rotationX + box.rotationY + box.rotationZ + box.rotationW));
});

test("independent Box3D authorities produce the same deterministic match", () => {
  const first = moversGame.createServer();
  const second = moversGame.createServer();
  for (let tick = 0; tick < 600; tick += 1) {
    first.step();
    second.step();
  }
  assert.deepEqual(first.currentState, second.currentState);
});

test("only the owning mover receives exact stamina", () => {
  const server = moversGame.createServer();
  server.addPlayer(1);
  server.addPlayer(2);
  const yellowView = server.createSnapshot(1, 0).state;
  const blueView = server.createSnapshot(2, 0).state;
  assert.equal(yellowView.players.find((player) => player.id === 1).stamina, 100);
  assert.equal(yellowView.players.find((player) => player.id === 2).stamina, null);
  assert.equal(blueView.players.find((player) => player.id === 1).stamina, null);
  assert.equal(blueView.players.find((player) => player.id === 2).stamina, 100);
  assert.equal("nextEventId" in yellowView, false);
});

test("furniture only scores when a mover closes their own truck doors", () => {
  const server = moversGame.createServer();
  server.addPlayer(1);
  const player = server.currentState.players.find((candidate) => candidate.id === 1);
  const urn = server.currentState.furniture.find((item) => item.kind === "urn");
  Object.assign(player, { x: -34, z: 0 });
  Object.assign(player, { carryingId: urn.id, grabbing: false });
  Object.assign(urn, { x: -35, z: 0, damage: 10, carriedBy: player.id });
  assert.equal(server.currentState.yellowScore, 0);

  assert.equal(server.submitInput(1, inputPacket(1, 1, { closeDoors: true })).accepted, true);
  const events = server.step().events;
  assert.equal(urn.securedBy, "yellow");
  assert.equal(server.currentState.yellowScore, Math.round(FURNITURE.urn.value * 0.9));
  assert.ok(events.some((event) => event.type === "doors" && event.team === "yellow"));
  assert.ok(events.some((event) => event.type === "secured" && event.itemId === urn.id));
});

test("Bad Movers bots can complete physical deliveries headlessly", () => {
  const server = moversGame.createServer();
  let secured = 0;
  for (let tick = 0; tick < 2_400; tick += 1) {
    for (const event of server.step().events) {
      if (event.type === "secured") secured += 1;
    }
  }
  assert.ok(secured >= 2, `expected bot deliveries, saw ${secured}`);
  assert.ok(server.currentState.yellowScore + server.currentState.blueScore > 0);
  assert.ok(server.currentState.furniture.every((item) => Number.isFinite(item.x + item.z + item.damage)));
});

test("Bad Movers input and state round-trip through the generic protocol", () => {
  const server = moversGame.createServer();
  server.addPlayer(7);
  const client = moversGame.createClient();
  client.initialize(7, server.createSnapshot(7, 10));
  const packet = client.createInput({
    forward: 1,
    strafe: -0.5,
    sprint: true,
    grab: true,
    throwItem: false,
    closeDoors: false,
  }, 1);
  const decoded = moversGame.protocol.decodeClient(
    moversGame.protocol.encodeClient({ kind: "input", packet }),
  );
  assert.equal(decoded.kind, "input");
  assert.deepEqual(decoded.packet, packet);
  assert.equal(server.submitInput(7, decoded.packet).accepted, true);
  server.step();
  client.step();
  client.reconcile(server.createSnapshot(7, 20));
  assert.ok(client.currentState.players.some((player) => player.id === 7));
});