avocado/packages/traits/test/trait.js

import {expect} from 'chai';

import Trait from '../src/trait';

class TestTrait extends Trait {

  static defaultParams() {
    return {
      asd: 'hello',
      sdf: 311,
    };
  }

  static defaultState() {
    return {
      foo: 69,
      bar: '420',
    };
  }

}

it('can set and override default params and state', async () => {
  const testTrait = await TestTrait.load({
    params: {
      asd: 'boo',
    },
    state: {
      bar: 'yee',
    },
  });
  expect(testTrait.toJSON()).to.deep.equal({
    params: {
      asd: 'boo',
      sdf: 311,
    },
    state: {
      bar: 'yee',
      foo: 69,
    },
  });
});

it('tracks state differences', () => {
  const testTrait = new TestTrait();
  testTrait.state.foo = 420;
  expect(testTrait.stateDifferences()).to.deep.equal({
    foo: {
      old: 69,
      value: 420,
    },
  });
  testTrait.markAsClean();
  expect(testTrait.stateDifferences()).to.deep.equal({});
});

it('can memoize listeners', () => {
  class ListenerTrait extends Trait {

    listeners() {
      return {
        heard: () => {},
      };
    }

  }
  const testTrait = new ListenerTrait();
  const memoized = testTrait.memoizedListeners();
  expect(Object.keys(testTrait.listeners())).to.deep.equal(Object.keys(memoized));
  expect(testTrait.memoizedListeners()).to.equal(testTrait.memoizedListeners());
});