nEngine/packages/render/test/asset-refs.test.ts

import { describe, expect, it } from "vitest";
import type { MapDef, SoundDef, SpriteDef } from "@nengine/core";
import { snapshotAssetRefs } from "../src/sync/asset-refs.js";

function map(): MapDef {
  return {
    id: "farm",
    width: 2,
    height: 2,
    tilesetRef: "tiles",
    spawn: { x: 0, y: 0 },
    layers: [{ name: "ground", data: [["grass", "water"], ["grass", "grass"]] }],
    tiles: { grass: "grass-1", water: "water-1" },
  };
}

describe("snapshotAssetRefs (D37 wanted-id derivation)", () => {
  it("collects image assets from the map tiles mapping and sprite image layers", () => {
    const sprites: SpriteDef[] = [
      {
        id: "s1",
        frames: [
          { layers: [{ shape: "rect", x: 0, y: 0, w: 1, h: 1, fill: "#ff0000" }] },
          { layers: [{ shape: "image", src: "plant-sprout" }] },
        ],
      },
    ];
    const refs = snapshotAssetRefs({ map: map(), sprites });
    expect(refs.images.sort()).toEqual(["grass-1", "plant-sprout", "water-1"]);
    expect(refs.audio).toEqual([]);
  });

  it("collects audio assets from sound def src ids and ignores synth-only defs", () => {
    const sounds: SoundDef[] = [
      { id: "till", src: "drop-1" },
      { id: "coin", synth: { wave: "sine", freq: 1, durationMs: 1 } },
    ];
    const refs = snapshotAssetRefs({ map: map(), sounds });
    expect(refs.audio).toEqual(["drop-1"]);
    expect(refs.images).toEqual(["grass-1", "water-1"]);
  });

  it("returns empty refs for a snapshot with no tiles mapping, no image layers, no src sounds", () => {
    const plain = { ...map(), tiles: undefined };
    const refs = snapshotAssetRefs({ map: plain });
    expect(refs.images).toEqual([]);
    expect(refs.audio).toEqual([]);
  });
});