metropolis/src/items/ean/ean.spec.ts

import { EANService } from './ean.service';

describe('EANService', () => {
  const eans = new EANService();
  test('generates valid EAN-13 checksum', () => {
    const sum = eans.calcChecksum('400638133393');
    expect(sum).toBe(1);
  });
});