o-unflatten/test/index.spec.js

Package for conversion from flat to nested objects

'use strict';

const expect = require('chai').expect;
const unflatten = require('../');

const nodes = [
  {id: 1, parentId: 0},
  {id: 2, parentId: 0},
  {id: 3, parentId: 1},
  {id: 4, parentId: 1},
  {id: 5, parentId: 2},
  {id: 6, parentId: 4},
  {id: 7, parentId: 5}
];

describe('Test module', () => {
  const nested = unflatten(nodes);

  it('Must be instance of Array', () => expect(nested).to.be.instanceof(Array));

  it('Must be an array with size 2', () => expect(nested).to.have.property('length').that.is.an('number').that.equals(2));

  it('Must have all simple properties', () => nested.map(item => expect(item).to.have.all.keys(['id', 'parentId', 'children'])));

  it('Arrays full lengths must be equal', () => {
    const deepLength = array => array.length + array.map(item => deepLength(item.children)).reduce((sum, curr) => sum + curr, 0);

    expect(nodes).to.have.property('length').that.is.an('number').that.equals(deepLength(nested));
  });
});