return (dispatch: Function, getState: GetState) =>
    dispatch(fetchModule(moduleCode)).then(() => {
      const module: Module = getState().moduleBank.modules[moduleCode];

      if (!module) {
        dispatch(
          openNotification(`Cannot load ${moduleCode}`, {
            action: {
              text: 'Retry',
              handler: () => dispatch(addModule(semester, moduleCode)),
            },
          }),
        );

        return;
      }

      const lessons = getModuleTimetable(module, semester);
      const moduleLessonConfig = randomModuleLessonConfig(lessons);

      dispatch({
        type: ADD_MODULE,
        payload: {
          semester,
          moduleCode,
          moduleLessonConfig,
        },
      });
    });

  test('should rethrow errors', async () => {
    const thunk = actions.fetchModule('CS1010S');

    const error = new Error('ModuleBank Test: Error loading module');
    const dispatch = jest.fn().mockRejectedValue(error);
    const getState = jest.fn().mockReturnValue({
      moduleBank: { modules: { CS1010S: {} } },
    } as any);

    // This line causes an uncaught promise exception, even though it should
    // be caught. Not sure why.
    await expect(thunk(dispatch, getState)).rejects.toThrowError(error);
  });

 .map((moduleCode) => dispatch(fetchModule(moduleCode))),