moonlit-engine/tests/engine.test.js

import { test } from "node:test";
import assert from "node:assert/strict";
import { readFileSync } from "node:fs";
import { Engine } from "../src/core/engine.js";

const example = JSON.parse(readFileSync(new URL("../example/game.json", import.meta.url), "utf8"));

function fresh() {
  let now = 0;
  const e = new Engine(structuredClone(example), { clock: () => now });
  const events = [];
  e.emitter.on("*", (ev) => events.push(ev));
  e.newGame();
  const advance = (ms) => { now += ms; e.tick(ms); };
  return { e, events, advance };
}

test("intro scene runs on the clock and lands the player in the start room", () => {
  const { e, events, advance } = fresh();
  e.startScene("intro");
  assert.ok(events.some((ev) => ev.event === "playMusic" && ev.track === "calypso"));
  assert.ok(events.some((ev) => ev.event === "slide"));
  advance(4000);   // slide done
  advance(3500);   // text done -> goto jetty
  assert.equal(e.scene, null);
  assert.equal(e.world.room, "jetty");
  assert.equal(e.world.seenScenes.intro, true);
});

test("scene skip jumps to the final goto", () => {
  const { e } = fresh();
  e.startScene("intro");
  e.skipScene();
  assert.equal(e.scene, null);
  assert.equal(e.world.room, "jetty");
});

test("clicking a walkable point schedules a walk that completes over time", () => {
  const { e, advance } = fresh();
  const p = e.world.characters.player;
  const startX = p.x;
  e.clickPoint(400, 380);
  assert.ok(e.walk, "walk scheduled");
  advance(1000);   // 80 px/s -> 80px
  assert.ok(p.x > startX);
  advance(5000);
  assert.equal(e.walk, null);
  assert.ok(Math.abs(p.x - 400) < 1, `arrived at x=400, got ${p.x}`);
});

test("click outside the walkable area clamps to the nearest edge", () => {
  const { e, advance } = fresh();
  e.clickPoint(700, 380);          // beyond the jetty polygon (x<=600)
  advance(10000);
  const p = e.world.characters.player;
  assert.ok(p.x <= 600 && p.x >= 590, `clamped near x=600, got ${p.x}`);
});

test("verb + object click: take the mug, then it leaves the room", () => {
  const { e } = fresh();
  e.selectVerb("use");
  const resp = e.click({ kind: "object", id: "mug", tags: ["container"] });
  assert.ok(resp.includes("pocket"));
  assert.deepEqual(e.world.inventory, ["mug"]);
  assert.ok(!e.world.objectsHere().some((o) => o.id === "mug"), "taken object leaves the room");
});

test("unmatched verb gets the default response — the engine always answers", () => {
  const { e } = fresh();
  e.selectVerb("give");
  const resp = e.click({ kind: "object", id: "post", tags: [] });
  assert.equal(resp, "They're not interested.");
});

test("walk verb + exit click changes rooms and fires onEnter (music)", () => {
  const { e, events } = fresh();
  e.selectVerb("walk");
  e.click({ kind: "exit", id: "tavern", tags: ["exit"] });
  assert.equal(e.world.room, "tavern");
  assert.equal(e.world.characters.player.room, "tavern");
  assert.ok(events.some((ev) => ev.event === "roomEnter" && ev.room === "tavern"));
});

test("talk verb starts the dialogue; clicks are swallowed mid-dialogue", () => {
  const { e } = fresh();
  e.goTo("tavern");
  e.selectVerb("talk");
  e.click({ kind: "character", id: "barkeep", tags: ["talker"] });
  assert.equal(e.dialogue.active, "barkeep_intro");
  const before = e.world.flags;
  const resp = e.click({ kind: "object", id: "post", tags: [] });
  assert.equal(resp, null, "clicks ignored during dialogue");
  assert.deepEqual(e.world.flags, before);
});

test("dialogue choice with give-mug chain: full interaction flow", () => {
  const { e, advance } = fresh();
  e.selectVerb("use");
  e.click({ kind: "object", id: "mug", tags: ["container"] });   // take mug
  e.goTo("tavern");
  e.selectVerb("give");
  const resp = e.click({ kind: "character", id: "barkeep", tags: ["talker"] }, "mug");
  assert.ok(resp.includes("very quiet"));
  assert.deepEqual(e.world.inventory, []);
  assert.equal(e.world.flags.gaveMug, true);
  assert.equal(e.world.vars.barkeepTrust, 1);
});

test("hitTest finds characters, objects, exits, then walkable", () => {
  const { e } = fresh();
  assert.equal(e.hitTest(500, 340).id, "post");
  assert.equal(e.hitTest(220, 375).id, "mug");
  assert.equal(e.hitTest(580, 340).kind, "exit");
  assert.equal(e.hitTest(300, 420).kind, "walkable");
  e.goTo("tavern");
  assert.equal(e.hitTest(400, 300).id, "barkeep");
});

test("endGame effect ends the run and blocks further clicks", () => {
  const spec = structuredClone(example);
  spec.interactions.push({ verb: "use", noun: "post", response: "The world ends.",
                           effects: [{ endGame: "win" }] });
  const e = new Engine(spec, { clock: () => 0 });
  e.newGame();
  e.selectVerb("use");
  e.click({ kind: "object", id: "post", tags: [] });
  assert.equal(e.phase, "ended");
  assert.equal(e.world.ended, "win");
  assert.equal(e.click({ kind: "object", id: "post", tags: [] }), null);
});

test("room onEnter effects fire on entry", () => {
  const spec = structuredClone(example);
  spec.rooms[1].onEnter = [{ setFlag: "visitedTavern" }];
  const e = new Engine(spec, { clock: () => 0 });
  e.newGame();
  e.goTo("tavern");
  assert.equal(e.world.flags.visitedTavern, true);
});

test("newGame resets everything", () => {
  const { e } = fresh();
  e.selectVerb("use");
  e.click({ kind: "object", id: "mug", tags: ["container"] });
  e.goTo("tavern");
  e.newGame();
  assert.equal(e.world.room, "jetty");
  assert.deepEqual(e.world.inventory, []);
  assert.equal(e.world.flags.tookMug, undefined);
});