Reactjs 可观察到的重复次数:epic的jest测试失败
我遵循从到测试epic的步骤Reactjs 可观察到的重复次数:epic的jest测试失败,reactjs,unit-testing,jestjs,redux-observable,Reactjs,Unit Testing,Jestjs,Redux Observable,我遵循从到测试epic的步骤 ... store.dispatch({ type: FETCH_USER }); expect(store.getActions()).toEqual([ { type: FETCH_USER }, { type: FETCH_USER_FULFILLED, payload } ]); ... 但我失败了,因为第二个动作在稍后收到,如下所示 Test failed Expected value to equal: [{"type
...
store.dispatch({ type: FETCH_USER });
expect(store.getActions()).toEqual([
{ type: FETCH_USER },
{ type: FETCH_USER_FULFILLED, payload }
]);
...
但我失败了,因为第二个动作在稍后收到,如下所示
Test failed
Expected value to equal:
[{"type": "FETCH_USER"}, {"type": "FETCH_USER_FULFILLED", "payload": [some]}]
Received:
[{"type": "FETCH_USER"}]
Difference:
- Expected
+ Received
@@ -1,20 +1,5 @@
Array [
Object {"type": "FETCH_USER"},
Object {"type": "FETCH_USER_FULFILLED", "payload": [some]} ] // this is what should be.
所以我想我应该知道什么时候派送结束或者类似的事情。
我怎样才能解决这个问题
我使用fetch()和Rx.Observable.fromPromise代替了ajax.getJSON()
这是我的史诗
const fetchUserEpic = (action$) =>
action$
.ofType(FETCH_USER)
.mergeMap(() => {
return Rx.Observable.fromPromise(api.fetchUser())
.map((users) => ({
type: FETCH_USER_FULFILLED,
payload: { users }
}))
.catch((error) => Rx.Observable.of({
type: FETCH_USER_ERROR,
payload: { error }
}))
.takeUntil(action$.ofType(FETCH_USER_CANCELLED))
})
原因是承诺总是在上解析,因此您的
api.fetchUser()
不会同步发出
您需要模拟它,使用类似于Promise.resolve()。然后(()=>expect(store.getActions)。toEqual(…)
的方法等待下一个微任务,或者您可以直接测试您的epics而不使用redux
it('Epics with the appropriate input and output of actions', (done) => {
const action$ = ActionsObservable.of({ type: 'SOMETHING' });
somethingEpic(action$, store)
.toArray() // collects everything in an array until our epic completes
.subscribe(actions => {
expect(actions).to.deep.equal([
{ type: 'SOMETHING_FULFILLED' }// whatever actions
]);
done();
});
});
当我(或其他人)有时间写的时候,这将是我们在文档中首选的测试故事。因此,我们不用在测试中使用redux和中间件,而是直接用我们自己的模拟调用epic函数。更简单、更干净
通过这种方法,我们可以利用redux observable的新依赖注入功能:
首先,使用Observable.ajax代替nock支持,如下所示
const fetchSomeData = (api: string, params: FetchDataParams) => {
const request = fetch(`${api}?${stringify(params)}`)
.then(res => res.json());
return Observable.from(request);
};
所以我的史诗是:
const fetchDataEpic: Epic<GateAction, ImGateState> = action$ =>
action$
.ofType(FETCH_MODEL)
.mergeMap((action: FetchModel) =>
fetchDynamicData(action.url, action.params)
.map((payload: FetchedData) => fetchModelSucc(payload.data))
.catch(error => Observable.of(
fetchModelFail(error)
)));
const fetchDataEpic:Epic=action$=>
行动$
.类型(FETCH_型号)
.mergeMap((操作:FetchModel)=>
FetchDynamicATA(action.url、action.params)
.map((负载:FetchedData)=>fetchModelSucc(负载.data))
.catch(错误=>Observable.of(
fetchModelFail(错误)
)));
然后,您可能需要一段时间来决定何时完成测试
describe("epics", () => {
let store: MockStore<{}>;
beforeEach(() => {
store = mockStore();
});
afterEach(() => {
nock.cleanAll();
epicMiddleware.replaceEpic(epic);
});
it("fetch data model succ", () => {
const payload = {
code: 0,
data: someData,
header: {},
msg: "ok"
};
const params = {
data1: 100,
data2: "4"
};
const mock = nock("https://test.com")
.get("/test")
.query(params)
.reply(200, payload);
const go = new Promise((resolve) => {
store.dispatch({
type: FETCH_MODEL,
url: "https://test.com/test",
params
});
let interval: number;
interval = window.setInterval(() => {
if (mock.isDone()) {
clearInterval(interval);
resolve(store.getActions());
}
}, 20);
});
return expect(go).resolves.toEqual([
{
type: FETCH_MODEL,
url: "https://test.com/assignment",
params
},
{
type: FETCH_MODEL_SUCC,
data: somData
}
]);
});
});
描述(“史诗”,()=>{
让商店:MockStore;
在每个之前(()=>{
store=mockStore();
});
之后(()=>{
nock.cleanAll();
epic.replacepic(epic);
});
它(“获取数据模型成功”,()=>{
常数有效载荷={
代码:0,
数据:一些数据,
标题:{},
味精:“好的”
};
常量参数={
数据1:100,,
数据2:“4”
};
常量mock=nock(“https://test.com")
.get(“/test”)
.query(参数)
.答复(200,有效载荷);
const go=新承诺((解决)=>{
仓库调度({
类型:FETCH_模型,
url:“https://test.com/test",
params
});
让间隔:数字;
间隔=窗口。设置间隔(()=>{
if(mock.isDone()){
间隔时间;
解析(store.getActions());
}
}, 20);
});
返回expect(go).resolves.toEqual([
{
类型:FETCH_模型,
url:“https://test.com/assignment",
params
},
{
类型:获取\模型\成功,
数据:somData
}
]);
});
});
享受它:)我发现解决方案是正确的。我得到了“TypeError:Cannotreadproperty'\u location'of null”,尽管这不在问题的范围之内。我在这上面花了几个小时。。。尝试此操作后出现“…toArray不是函数”错误。是的,RxJS用户始终可以决定如何导入运算符。仍然存在问题。。。带有Observable.ajax的epic返回DomeException InvalidAccessError。我在开玩笑。似乎它没有正确地模仿…问题不在ajax调用中。任何可观察到的异步执行都会导致超时。对
done
的调用从未发生过。
const fetchSomeData = (api: string, params: FetchDataParams) => {
const request = fetch(`${api}?${stringify(params)}`)
.then(res => res.json());
return Observable.from(request);
};
const fetchDataEpic: Epic<GateAction, ImGateState> = action$ =>
action$
.ofType(FETCH_MODEL)
.mergeMap((action: FetchModel) =>
fetchDynamicData(action.url, action.params)
.map((payload: FetchedData) => fetchModelSucc(payload.data))
.catch(error => Observable.of(
fetchModelFail(error)
)));
describe("epics", () => {
let store: MockStore<{}>;
beforeEach(() => {
store = mockStore();
});
afterEach(() => {
nock.cleanAll();
epicMiddleware.replaceEpic(epic);
});
it("fetch data model succ", () => {
const payload = {
code: 0,
data: someData,
header: {},
msg: "ok"
};
const params = {
data1: 100,
data2: "4"
};
const mock = nock("https://test.com")
.get("/test")
.query(params)
.reply(200, payload);
const go = new Promise((resolve) => {
store.dispatch({
type: FETCH_MODEL,
url: "https://test.com/test",
params
});
let interval: number;
interval = window.setInterval(() => {
if (mock.isDone()) {
clearInterval(interval);
resolve(store.getActions());
}
}, 20);
});
return expect(go).resolves.toEqual([
{
type: FETCH_MODEL,
url: "https://test.com/assignment",
params
},
{
type: FETCH_MODEL_SUCC,
data: somData
}
]);
});
});