singletons/test/ignore.test.js

Helps create and manage families of singletons based on customizable conditions

import {expect} from 'chai';
import {SingletonFactory} from '../src/singletons';

describe('Testing Singleton ignore type', function () {
  it(`Testing with SingletonFactory(Class, ['object', 'ignore'])`, function () {
    class Class {
      constructor () {}
    }

    const Singleton = SingletonFactory(Class, ['object', 'ignore']);

    const o1 = {id: 1};
    const o2 = {id: 2};
    const o3 = {id: 3};

    const s1 = Singleton(o1, o3);
    const s2 = Singleton(o2, 'dummy');

    expect(s1).not.to.equal(s2);

    expect(Singleton.get(o1)).to.equal(s1);
    expect(Singleton.get(o2)).to.equal(s2);
    expect(Singleton(o1)).to.equal(s1);
    expect(Singleton(o2)).to.equal(s2);

    expect(Singleton.get(o3)).to.be.undefined;

    const s3 = Singleton(o3);
    expect(Singleton.get(o3)).to.equal(s3);
    expect(Singleton.get({id: 3})).to.be.undefined;
    expect(Singleton.get({id: 3, color: 'red'})).to.be.undefined;
    expect(Singleton(o3)).to.equal(s3);

    expect(s1).not.to.equal(s3);
    expect(s2).not.to.equal(s3);
  });

  it(`Testing with SingletonFactory(Class, [{
    type: 'array',
    sub: ['object', 'object', 'ignore', 'object']
  }])`, function () {
      class Class {
        constructor () {}
      }

      const Singleton = SingletonFactory(Class, [{
        type: 'array',
        sub: ['object', 'object', 'ignore', {
          type: 'object',
          optional: true,
        }],
      }]);

      const o1 = {id: 1};
      const o2 = {id: 2};
      const o3 = {id: 3};

      const s1 = Singleton([o1, o2, 'dummy1', o3]);
      const s2 = Singleton([o1, o2, o3]);

      expect(s1).not.to.equal(s2);

      expect(Singleton.get([o1, o2, 'anything', o3])).to.equal(s1);
      expect(Singleton.get([o1, o2])).to.equal(s2);
      expect(Singleton([o1, o2, 'foo', o3])).to.equal(s1);
      expect(Singleton([o1, o2])).to.equal(s2);

      expect(Singleton.get([o2, o3])).to.be.undefined;

      const s3 = Singleton([o2, o3]);
      expect(Singleton.get([o2, o3])).to.equal(s3);
      expect(Singleton.get([o3, o2])).to.be.undefined;
      expect(Singleton.get([o2, {id: 3}])).to.be.undefined;
      expect(Singleton.get([o2, {id: 3, color: 'red'}])).to.be.undefined;
      expect(Singleton([o2, o3])).to.equal(s3);

      expect(s1).not.to.equal(s3);
      expect(s2).not.to.equal(s3);
    });
});