silphius/app/ecs/query.test.js

import {expect, test} from 'vitest';

import Ecs from './ecs.js';
import {wrapComponents} from './test-helper.js';
import Query from './query.js';

const Components = wrapComponents([
  ['A', {a: {type: 'int32', defaultValue: 64}}],
  ['B', {b: {type: 'int32', defaultValue: 32}}],
  ['C', {c: {type: 'int32'}}],
]);

const ecsTest = test.extend({
  ecs: async ({}, use) => {
    const ecs = new Ecs({Components});
    await ecs.createManySpecific([
      [1, {B: {}}],
      [2, {A: {}, B: {}, C: {}}],
      [3, {A: {}}],
      [4, {C: {}}],
    ]);
    await use(ecs);
  },
});

async function testQuery(ecs, parameters, expected) {
  const query = new Query(parameters, ecs);
  query.reindex([1, 2, 3]);
  expect(query.count)
    .to.equal(expected.length);
  for (const _ of query.select()) {
    expect(expected.includes(_.id))
      .to.equal(true);
  }
}

ecsTest('can query all', async ({ecs}) => {
  await testQuery(ecs, [], [1, 2, 3]);
});

ecsTest('can query some', async ({ecs}) => {
  await testQuery(ecs, ['A'], [2, 3]);
  await testQuery(ecs, ['A', 'B'], [2]);
});

ecsTest('can query excluding', async ({ecs}) => {
  await testQuery(ecs, ['!A'], [1]);
  await testQuery(ecs, ['A', '!B'], [3]);
});

ecsTest('can deindex', async ({ecs}) => {
  const query = new Query(['A'], ecs);
  query.reindex([1, 2, 3]);
  expect(query.count)
    .to.equal(2);
  query.deindex([2]);
  expect(query.count)
    .to.equal(1);
});

ecsTest('can reindex', async ({ecs}) => {
  const query = new Query(['B'], ecs);
  query.reindex([1, 2]);
  expect(query.count)
    .to.equal(2);
  ecs.destroyMany(new Set([2]));
  query.reindex([1, 2]);
  expect(query.count)
    .to.equal(1);
});

ecsTest('can select', async ({ecs}) => {
  const query = new Query(['A'], ecs);
  query.reindex([1, 2, 3]);
  const it = query.select();
  const {value: {A}} = it.next();
  expect(A.a)
    .to.equal(64);
});