silphius/app/engine/engine.test.js

import {expect, test} from 'vitest';

import {RESOLUTION} from '@/constants.js'
import Server from '@/net/server/server.js';
import Engine from './engine.js';

test('visibility-based updates', async () => {
  const engine = new Engine(Server);
  const ecs = engine.ecses[1];
  // Create an entity.
  const entity = ecs.get(ecs.create({
    Momentum: {x: 1, y: 0},
    Position: {x: (RESOLUTION.x * 1.5) + 32 - 3, y: 20},
    VisibleAabb: {},
  }));
  // Connect an entity.
  await engine.connectPlayer(undefined);
  // Tick and get update. Should be a full update.
  engine.tick(1);
  expect(engine.updateFor(undefined))
    .to.deep.include({2: ecs.get(2).toJSON(), 3: {MainEntity: {}, ...ecs.get(3).toJSON()}});
  // Tick and get update. Should be a partial update.
  engine.tick(1);
  expect(engine.updateFor(undefined))
    .to.deep.include({
      2: {
        Position: {x: (RESOLUTION.x * 1.5) + 32 - 1},
        VisibleAabb: {
          x0: 1199,
          x1: 1263,
        },
      },
    });
  // Tick and get update. Should remove the entity.
  engine.tick(1);
  expect(engine.updateFor(undefined))
    .to.deep.include({2: false});
  // Aim back toward visible area and tick. Should be a full update for that entity.
  entity.Momentum.x = -1;
  engine.tick(1);
  expect(engine.updateFor(undefined))
    .to.deep.include({2: ecs.get(2).toJSON()});
});