feuerwerk/tools/e2e/03-play.mjs

const FIXTURE_IDS = ['o1', 'o2', 'o3', 'o4', 'o5', 'oc1', 'oc2'];

/**
 * Play mode: the camera frame is rendered, the Mover behavior moves its owner on the arrow
 * keys, Esc stops without touching the model. Then editing while playing (moves, delete, undo
 * and Spawn reach the world at once; Stop discards all of it), culling, and a scene without a
 * camera.
 */
export async function play(t) {
  const {
    check,
    sleep,
    evaluate,
    json,
    shot,
    clickText,
    press,
    holdKey,
    undo,
    state,
    object,
    objects,
    world,
    entity,
    select,
    mutate,
    stop,
  } = t;
  const gameInfo = () => json('__gm.gameInfo()');
  const play = t.play;

  // 7. Play: both crates lie inside the 640×360 frame at the origin; the behavior symbol is
  //    editor-only. The "Mover" behavior owns the red crate: holding ArrowRight moves it in the
  //    world (Axis input × speed × dt), Esc stops without touching the model.
  await clickText('Renamed crate');
  const xBeforePlay = (await object('o2')).position.x;
  await play();
  let s = await state();
  check('play mode entered', s.mode === 'play', JSON.stringify(s));
  let info = await gameInfo();
  check(
    'play renders the camera frame with both crates',
    info.rendering && info.visibleItems === 2,
    JSON.stringify(info),
  );
  await shot('08-playing');
  await holdKey('ArrowRight', 400);
  const movedCrate = await entity('o1');
  check(
    'behavior graph moved its owner while ArrowRight was held',
    movedCrate.x > -150 + 30,
    `world x=${movedCrate.x}`,
  );
  await holdKey('ArrowLeft', 250);
  const afterLeft = await entity('o1');
  check(
    'ArrowLeft (axis x = −1) moved the owner back left',
    afterLeft.x < movedCrate.x,
    `world x=${afterLeft.x}`,
  );
  await stop();
  s = await state();
  check('escape stopped play', s.mode === 'edit', JSON.stringify(s));
  await shot('09-stopped');
  const o2AfterPlay = (await object('o2')).position.x;
  const o1AfterPlay = (await object('o1')).position.x;
  check(
    'play did not write back to the model',
    o2AfterPlay === xBeforePlay && o1AfterPlay === -150,
    `${o2AfterPlay} vs ${xBeforePlay}, o1=${o1AfterPlay}`,
  );

  // 7a. Editing while playing: Play opens the Game tab, the panels stay open and edit a runtime
  //     copy. Moving the blue crate (model hook + preview, as a scrub does) and deleting it with
  //     the Delete key change the world at once, undo brings it back, Esc restores the saved model.
  await play();
  check('play opens the Game tab', (await evaluate('__gm.tab()')) === 'game');
  check(
    'panels stay visible while playing',
    Boolean(await evaluate(`__gm.locate('INSPECTOR')`)) &&
      (await evaluate('__gm.hierarchyExpandAll(); __gm.hierarchyOrder().length')) === 7,
  );
  await select({ kind: 'object', sceneId: 'scene1', objectId: 'o2' });
  await mutate(`__gm.state.activeScene.objects.find(o => o.id === 'o2').position.x = 400`);
  let liveO2 = await entity('o2');
  check(
    'an edit while playing moves the entity in the world',
    liveO2 && liveO2.x === 400,
    JSON.stringify(liveO2),
  );
  await shot('08b-editing-while-playing');
  await press('Delete');
  await sleep(150);
  const liveIds = (await world()).entities.map((e) => e.objectId);
  check(
    'Delete while playing removes the entity and its collider child from the world',
    !liveIds.includes('o2') && !liveIds.includes('oc2') && liveIds.length === 5,
    JSON.stringify(liveIds),
  );
  await undo();
  liveO2 = await entity('o2');
  check(
    'undo while playing brings the entity back into the world',
    liveO2 && liveO2.x === 400,
    JSON.stringify(liveO2),
  );

  // 7a-ii. Spawning: the "Spawner" behavior places a Crate at (0, 150) on Space. The new object
  //        shows up in the runtime scene (hierarchy), in the world and in the Game view at once;
  //        Stop discards it with the rest of the runtime copy.
  const visibleBeforeSpawn = (await gameInfo()).visibleItems;
  await press('Space');
  await sleep(200);
  const spawnedObjects = await objects();
  const spawned = spawnedObjects.find((o) => !FIXTURE_IDS.includes(o.id));
  check(
    'Spawn node adds a crate object to the runtime scene at (0, 150)',
    spawned &&
      spawned.assetId === 'crate' &&
      spawned.parentId === '' &&
      spawned.position.x === 0 &&
      spawned.position.y === 150 &&
      spawnedObjects.length === 8,
    JSON.stringify(spawned),
  );
  const spawnWorld = await world();
  check(
    'the spawned entity lives in the world and its name reached the Log node',
    spawnWorld.entities.length === 8 && spawnWorld.log.includes('Crate'),
    JSON.stringify({ n: spawnWorld.entities.length, log: spawnWorld.log }),
  );
  check(
    'hierarchy lists the spawned object',
    (await evaluate('__gm.hierarchyExpandAll(); __gm.hierarchyOrder().length')) === 8,
  );
  info = await gameInfo();
  check(
    'the Game view renders the spawned crate',
    info.visibleItems === visibleBeforeSpawn + 1,
    `${JSON.stringify(info)} before=${visibleBeforeSpawn}`,
  );
  await shot('08c-spawned');
  await stop();
  const o2AfterEdit = (await object('o2')).position.x;
  check(
    'stop restores the saved model untouched by play-mode edits (spawned object gone)',
    o2AfterEdit === xBeforePlay && (await objects()).length === 7,
    `x=${o2AfterEdit}`,
  );
  check('stop returns to the Scene tab', (await evaluate('__gm.tab()')) === 'scene');

  // 7b. Culling: move the blue crate far outside the camera frame → only one item visible.
  await mutate(`__gm.state.activeScene.objects.find(o => o.id === 'o2').position.x = 5000`);
  await play();
  info = await gameInfo();
  check('objects outside the camera frame are culled', info.visibleItems === 1, JSON.stringify(info));
  await stop();
  await mutate(`__gm.state.activeScene.objects.find(o => o.id === 'o2').position.x = ${xBeforePlay}`);

  // 7c. Without a camera nothing is rendered: delete the camera object, play, then undo.
  await select({ kind: 'object', sceneId: 'scene1', objectId: 'o3' });
  await press('Delete');
  await sleep(200);
  check('camera object deleted', (await objects()).length === 6);
  await play();
  info = await gameInfo();
  s = await state();
  check(
    'play without camera renders nothing',
    s.mode === 'play' && !info.rendering && info.visibleItems === 0,
    JSON.stringify(info),
  );
  check('play without camera shows a notice', s.notice.includes('no camera'), s.notice);
  await shot('10-play-no-camera');
  await stop();
  await undo();
  check('undo restored the camera object', (await objects()).length === 7);
}