ReactJs - test multiple calls in redux-saga with expectSaga - unit-testing

Question

I'm using expectSaga ('redux-saga-test-plan') to test one of my sagas and I'm wondering how to test multiple calls made within the same saga.
Sagas.js
export function* fetchSomething(arg){
const response = yield call(executeFetch, arg);
if(response.status === 200){
// trigger success action
} else if (response.status >= 400){
const errResp = yield response.json();
const errorCode = yield call(sharedUtilToExtractErrors, errResp);
yield put(
{ type: 'FETCH_FAILED', errorMessage: UI_ERR_MSG, errorCode }
);
}
}
Unit test
import { expectSaga } from 'redux-saga-test-plan';
describe('fetchSomething', () => {
// positive paths
// ..
// negative paths
it('fetches something and with status code 400 triggers FETCH_FAILED with error message and extracted error code', () => {
const serverError = { message: 'BANG BANG BABY!' };
const koResponse = new Response(
JSON.stringify(serverError),
{ status: 400, headers: { 'Content-type': 'application/json' } }
);
return expectSaga(fetchSomething)
.provide(
{
call: () => koResponse,
call: () => serverError.message,
}
)
.put({
type: 'FETCH_FAILED', errorMessage: UI_ERR_MSG, serverError.message
})
.run();
})
})
Clearly having the "call" attribute twice in the same object passed in to provide() doesn't work but also calling provide() twice doesn't do the trick. Any suggestions?
Thanks

Answer 1

This is how you can provide multiple calls according to the documentation:
.provide([ // this external array is actually optional
[call(executeFetch, arg), koResponse],
[call(sharedUtilToExtractErrors, serverError), serverError.message],
])
or if you're lazy and don't want to specify the arguments:
import * as matchers from 'redux-saga-test-plan/matchers';
.provide(
[matchers.call.fn(executeFetch), koResponse],
[matchers.call.fn(sharedUtilToExtractErrrors), serverError.message],
)
Neither of these two worked for me though as for some reason it was not mocking out the dependencies and still calling them caused errors.
I solved using a dynamic provider:
.provide({
// select(effect, next) { return 'something-for-a-selector' },
call(effect) {
switch(effect.fn.constructor.name) {
case executeFetch.constructor.name: return koResponse;
case sharedUtilToExtractErrors.constructor.name: return serverError.message;
default: throw new Error('Unknown function called in test');
}
}
})