import { AnalyticsService, DataLayerWindow, AnalyticsEvent } from './AnalyticsService';
import { Mock, IMock, It, Times } from 'typemoq';
import { expect } from 'chai';

describe('Analytics service', () => {
  let dataLayer: AnalyticsEvent[];
  let service: AnalyticsService;

  beforeEach(() => {
    dataLayer = [];
    let $window = Mock.ofType<DataLayerWindow>();
    $window.setup(x => x.dataLayer).returns(() => dataLayer);
    service = new AnalyticsService($window.object);
  });

  it('should add an event to the data layer', () => {
    const event: AnalyticsEvent = { event: 'ViewQuoteForm', postcode: 'AB12CD' };
    service.push(event);
    expect(dataLayer).to.contain(event);
  });

  it('should clear the data layer', () => {
    dataLayer.push(
      { event: 'ViewQuoteForm', postcode: 'AB12CD', paymentMethod: 'Paym' },
      { event: 'ViewQuoteForm', fuel: 'Electricity' }
    );
    service.clear();
    expect(dataLayer).to.contain({ postcode: undefined, paymentMethod: undefined, fuel: undefined });
  });
});