text: import { expect } from 'chai';
  import { Airplane, TrafficTower } from '../TrafficTower.es6';
  
  describe('behavioral->mediator: TrafficTower.es6', () => {
    it('should get position of all airplanes', () => {
      const trafficTower = new TrafficTower();
      const airplanes = [10, 15, 55].map(value => new Airplane(value, trafficTower));
  
      expect(airplanes[0].requestPositions()).to.deep.equals([10, 15, 55]);
    });
  });
  