import worker from './dispatcher-worker';

jest.mock('../db', () => ({
  initDb: () => 'called initDb',
}));

describe('The dispatcher-worker ', () => {
  let port;
  beforeEach(() => {
    port = {
      postMessage: jest.fn(),
    };
    worker.onconnect({ ports: [port] });
  });
  test('creates a onmessage function', () => {
    expect(port.onmessage).toBeDefined();
    expect(port.postMessage).not.toBeCalled();
  });
  test('receives a ping and sends back an unknownAction', async () => {
    await port.onmessage({ data: { id: 5, payload: { action: 'ping' } } });
    expect(port.postMessage).toBeCalledWith({
      id: 5,
      payload: 'unknownAction',
    });
  });
  test('calls initDb when required', async () => {
    await port.onmessage({ data: { id: 5, payload: { action: 'initDb' } } });
    expect(port.postMessage).toBeCalledWith({
      id: 5,
      payload: 'called initDb',
    });
  });
});