I am trying to stub a fetch call with sinon and sinon-stub-promise. I'm pretty close...but I am not sure why it doesn't invoke the response.json() method I created.
function toJSON(response) {
console.log(response);
return response.json();
}
function init() {
fetch(darkWeatherUrl)
.then(toJSON)
.then(computeHours)
.then(sendAlerts)
.catch((e) => {
console.log('init error ' + e);
});
}
describe('lifx alert test', ()=> {
it('should run fetch', ()=> {
var fetch = sinon.stub().returnsPromise();
var body = {
"hourly": {
data:
[ { time: 1493413200,
icon: 'clear-day',
precipIntensity: 0,
precipProbability: 0,
ozone: 297.17 },
{ time: 1493416800,
icon: 'clear-day',
precipIntensity: 0,
precipProbability: 0,
ozone: 296.89 },
{ time: 1493420400,
icon: 'clear-day',
precipIntensity: 0,
precipProbability: 0,
ozone: 296.73 },
{ time: 1493424000,
icon: 'clear-day',
precipIntensity: 0,
precipProbability: 0,
ozone: 296.31 } ]
}
};
function json() {
return body;
}
var response = {};
response.json = json;
fetch.resolves(response);
var init = proxy('../index.js', {'node-fetch': fetch});
init();
fetch.should.have.been.called;
});
});
lifex alert test
{ json: [Function: json] }
[ { time: 1493413200,
icon: 'clear-day',
precipIntensity: 0,
precipProbability: 0,
ozone: 297.17 },
{ time: 1493416800,
icon: 'clear-day',
precipIntensity: 0,
precipProbability: 0,
ozone: 296.89 },
{ time: 1493420400,
icon: 'clear-day',
precipIntensity: 0,
precipProbability: 0,
ozone: 296.73 },
{ time: 1493424000,
icon: 'clear-day',
precipIntensity: 0,
precipProbability: 0,
ozone: 296.31 } ]
init error TypeError: response.json is not a function
â should run fetch
1 passing
See update on the bottom also
I removed sinon-stub-promise and kept it native sinon:
describe('lifx alert test', ()=> {
var fetchStub;
beforeEach(() => {
fetchStub = sinon.stub();
});
it('should run fetch', ()=> {
var body = {
"hourly": {
data:
[ { time: 1493413200,
icon: 'clear-day',
precipIntensity: 0,
precipProbability: 0,
ozone: 297.17 },
{ time: 1493416800,
icon: 'clear-day',
precipIntensity: 0,
precipProbability: 0,
ozone: 296.89 },
{ time: 1493420400,
icon: 'clear-day',
precipIntensity: 0,
precipProbability: 0,
ozone: 296.73 },
{ time: 1493424000,
icon: 'clear-day',
precipIntensity: 0,
precipProbability: 0,
ozone: 296.31 } ]
}
};
var response = { json: () => { return body } };
fetchStub.returns(Promise.resolve(response));
var init = proxy('../index.js', {'node-fetch': fetchStub});
init();
fetchStub.should.have.been.called;
});
UPDATE
I got it to work with sinon-stub-promise with proxyquire's global attribute:
describe('lifx alert test', ()=> {
it('should run fetch', ()=> {
var fetch = sinon.stub().returnsPromise();
var body = {
"hourly": {
data:
[ { time: 1493413200,
icon: 'clear-day',
precipIntensity: 0,
precipProbability: 0,
ozone: 297.17 },
{ time: 1493416800,
icon: 'clear-day',
precipIntensity: 0,
precipProbability: 0,
ozone: 296.89 },
{ time: 1493420400,
icon: 'clear-day',
precipIntensity: 0,
precipProbability: 0,
ozone: 296.73 },
{ time: 1493424000,
icon: 'clear-day',
precipIntensity: 0,
precipProbability: 50,
ozone: 296.31 } ]
}
};
var response = { json: () => { return body } };
fetch['@global'] = true;
fetch.resolves(response);
proxy('../index.js', {'node-fetch': fetch});
fetch.should.have.callCount(3);
});
});