error in test

error in the following test:

assert.deepEqual( gen.next().value, call(delay, 1000), 'incrementAsync Saga must call delay(1000)' )

this gen.next().value return a promise as value:

{ value: Promise { _c: [], _a: undefined, _s: 0, _d: false, _v: undefined, _h: 0, _n: false, '@@redux-saga/cancelPromise': [Function] }, done: false }

So the test fail

[rodolfoag]

For newcomers: I was getting the same error and the problem was on the first line of incrementAsync(): yield call(delay(1000)) should be yield call(delay, 1000)

[ropinheiro]

Meanwhile, I found this answer in StackOverflow:

https://stackoverflow.com/questions/49263089/how-to-test-redux-saga-delay

More specifically:

I suspected that something like that would be happening.

I fixed my problem by using this in both files (sagas.js and sagas.spec.js):

import { delay } from 'redux-saga'

instead of this:

const delay = ms => new Promise(res => setTimeout(res, ms))

I think the tutorial should be changed for this, too, as it not only fixes the issue, but also applies a bit of DRY philosophy to the code (not to mention the DRTW).