How to test cyclejs http driver? - http

Question

Suppose I have an API that return user detail:
/api/get_user/1
{
"status": 200,
"data": {
"username": "username1",
"email": "username#email.com"
}
}
And a "main function" like this:
function main (sources) {
const request$ = sources.ACTIONS
.filter(action => action.type === 'GET_USER_REQUEST')
.map(action => action.payload)
.map(payload => ({
category: 'GET_USER_REQUEST',
url: `${BASE_URL}/api/get_user/${payload.userId}`,
method: 'GET'
}))
const action$ = sources.HTTP
.select('GET_USER_REQUEST')
.flatten()
.map(response => response.data)
const sinks = {
HTTP: request$,
LOG: action$
}
return sinks
}
For testing the "ACTION" source, I can simply made an xstream observable
test.cb('Test main function', t => {
const actionStream$ = xs.of({
type: 'GET_USER_REQUEST',
payload: { userId: 1 }
})
const sources = { ACTION: actionStream$ }
const expectedResult = {
category: 'GET_USER_REQUEST',
url: `${BASE_URL}/api/get_user/${payload.userId}`,
method: 'GET'
}
main(sources).HTTP.addEventListener({
next: (data) => {
t.deepEqual(data, expectedResult)
},
error: (error) => {
t.fail(error)
},
complete: () => {
t.end()
}
})
})
The question is. Is it possible to do the same thing (using plan xstream observable)
to test cycle-http driver without a helper from something like nock?
Or is there a better way to test something like this?

Answer 1

You can mock out the HTTP source like so:
test.cb('Test main function', t => {
const actionStream$ = xs.of({
type: 'GET_USER_REQUEST',
payload: { userId: 1 }
})
const response$ = xs.of({
data: {
status: 200,
data: {
username: "username1",
email: "username#email.com"
}
}
});
const HTTP = {
select (category) {
// if you have multiple categories you could return different streams depending on the category
return xs.of(response$);
}
}
const sources = { ACTION: actionStream$, HTTP }
const expectedResult = {
category: 'GET_USER_REQUEST',
url: `${BASE_URL}/api/get_user/${payload.userId}`,
method: 'GET'
}
main(sources).HTTP.addEventListener({
next: (data) => {
t.deepEqual(data, expectedResult)
},
error: (error) => {
t.fail(error)
},
complete: () => {
t.end()
}
})
})
Really, we should have a mockHTTPSource helper to make this a bit easier. I have opened an issue to that effect. https://github.com/cyclejs/cyclejs/issues/567
If you want to test that certain things happen at the correct time, you could use this pattern in conjunction with #cycle/time.
http://github.com/cyclejs/time