相关疑难解决方法(0)

我在测试一个动作创建器时遇到了麻烦,该动作创建器只是遍历传递给它的数组,并为该数组中的每个项目调度一个动作.这很简单,我似乎无法弄明白.这是动作创建者:

export const fetchAllItems = (topicIds)=>{
  return (dispatch)=>{
    topicIds.forEach((topicId)=>{
      dispatch(fetchItems(topicId));
    });
  };
};

以下是我试图测试的方法:

describe('fetchAllItems', ()=>{
  it('should dispatch fetchItems actions for each topic id passed to it', ()=>{
    const store = mockStore({});
    return store.dispatch(fetchAllItems(['1']))
      .then(()=>{
        const actions = store.getActions();
        console.log(actions);
        //expect... I can figure this out once `actions` returns...
      });
  });
});

我收到这个错误:TypeError: Cannot read property 'then' of undefined.

我是一个新的单元测试Redux-thunk使用Jest的Action .

以下是代码:

export const functionA = (a,b) => (dispatch) =>{
    dispatch ({type: CONSTANT_A, payload: a});
    dispatch ({type: CONSTANT_B, payload: b});
} 

如何测试功能使用Unit-Test Jest？任何人都可以帮助我^^.预先感谢 :)