测试redux-saga

Question

我正在尝试为redux saga实现一个测试，如下所示，但我遇到了一个问题。我得到的错误是无法读取未定义的属性有效负载。由于某种原因，我传递给saga函数的'message‘变量没有定义，有人能告诉我为什么吗？谢谢

  saga.spec.js
    import test from 'tape'
    import { put,take,call } from 'redux-saga/effects'
    import { onCreateMessage } from '../src/common/sagas/messages'
    import { addMessage,createMessage } from '../src/common/reducers/messages'


    test('createMessage', assert => {
        const gen = onCreateMessage()



        var message = {
            id: 1234,
            channelID: "AA",
            text: "text",
            user: "user"
          }

        assert.deepEqual(
            gen.next(message).value,
            put(addMessage(message)),
            'createMessage should dispatch addMessage action'
        )

    })

saga/index.js
export default function* rootSaga(){

    yield [ 

        takeEvery('CREATE_MESSAGE', onCreateMessage),
        ......
        ]

当我通过控制台控制下面记录的消息时，我得到了'undefined‘

export function* onCreateMessage(message) {
    console.log(message)
    yield put(addMessage(message.payload))

    try {
        yield call(fetch,'/api/newmessage',
            {
             method: 'post',
             headers: {
                'Content-Type': 'application/json'
                },
             body: JSON.stringify(message.payload)}
            )

    } catch (error){
        throw error
    }
}

我正在使用来自redux-actions的actionCreator：

export const addMessage = createAction(ADD_MESSAGE);

Answer 1

变化

const gen = onCreateMesaage()

至

const gen = onCreateMessage(message)

解释：

message是传递给生成器函数的参数，而不是yield结果。前面的代码适用于产生的结果。e.g

export function* onCreateMessage() {
    const message = yield 
    console.log(message)
    yield put(addMessage(message.payload))
}