function polling(tries) {
  return async (dispatch, getState) => {
    const result = await Promise.all([
      loadIntegrations(), // calling fetch()
      getAllEnabledCalendarEvents(), // calling fetch()
    ]);
    if (Array.isArray(result)) {
      if (
        result[0].every((calendar) => calendar.name && calendar.id) &&
        areDifferentBy(getState().time.integratedCalendars, result[0])
      ) {
        dispatch(setPolling(false));
        dispatch(setPollingInterval(null));
        dispatch(
          getIntegratedCalendarEvents(
            (result[1] || []).map(formatIntegrationEvent)
          )
        );
        dispatch(getIntegratedCalendars(result[0]));
      }
    }

    if (tries >= 100) {
      // There seems to be no way in Jest to mock the 100 tries
      // and see these `dispatch()` calls in the `store.getActions();`
      // return value.
      dispatch(setPolling(false));
      dispatch(setPollingInterval(null));
      const msgKey = 'wfhomecalendar.outlook.synctimeout';
      const msgs = await Stores.WF.getMessageSet([msgKey]);
      addErrorToast(msgs['msgKey']);
    }
  };
}

export function pollForNewIntegration() {
  return (dispatch) => {
    dispatch(setPolling(true));
    let tries = 0;
    dispatch(
      setPollingInterval(
        setInterval(
          async () => await dispatch(polling(tries++)),
          SECOND_IN_MS * 3
        )
      )
    );
  };
}