separate business layer from infrastructure layer after test

service.spec.js

import {jest} from '@jest/globals'

import Service from './service';

test('teams with disqualified players cannot check-in', async () => {
  const repository = {
    findDisqualifiedPlayers: jest.fn()
      .mockResolvedValueOnce([
        {
          teamID: 'some team id',
          reason: 'was a big meanie'
        }
      ]),
      checkInTeam: jest.fn()
  };

  const service = Service(repository);
  await expect(service.checkIn('some team id')).rejects.toThrow();
  expect(repository.findDisqualifiedPlayers).toHaveBeenNthCalledWith(1, 'some team id');
  expect(repository.checkInTeam).not.toHaveBeenCalled();
});