silphius/app/ecs/component.test.js

import {expect, test} from 'vitest';

import Component from './component.js';

const fakeEcs = {markChange() {}};

test('creates instances', async () => {
  class CreatingComponent extends Component {
    static properties = {
      foo: {defaultValue: 'bar', type: 'string'},
    };
  }
  const ComponentInstance = new CreatingComponent(fakeEcs);
  await ComponentInstance.create(1);
  expect(ComponentInstance.get(1).entity)
    .to.equal(1);
});

test('does not serialize default values', async () => {
  class CreatingComponent extends Component {
    static properties = {
      foo: {defaultValue: 'bar', type: 'string'}, bar: {type: 'uint8'},
    };
  }
  const ComponentInstance = new CreatingComponent(fakeEcs);
  await ComponentInstance.create(1)
  expect(ComponentInstance.get(1).toJSON())
    .to.deep.equal({});
  ComponentInstance.get(1).bar = 1;
  expect(ComponentInstance.get(1).toJSON())
    .to.deep.equal({bar: 1});
});

test('reuses instances', async () => {
  class ReusingComponent extends Component {
    static properties = {
      foo: {type: 'string'},
    };
  }
  const ComponentInstance = new ReusingComponent(fakeEcs);
  await ComponentInstance.create(1);
  const instance = ComponentInstance.get(1);
  ComponentInstance.destroy(1);
  expect(ComponentInstance.get(1))
    .to.be.undefined;
  expect(() => {
    ComponentInstance.destroy(1);
  })
    .to.throw();
  await ComponentInstance.create(1);
  expect(ComponentInstance.get(1))
    .to.equal(instance);
});