refactoredFetchTimeline.spec.js

// spec/javascripts/integration/twitter/fetchTimeline.spec.js

import { expect } from 'chai';
import sinon from 'sinon';
import fetchTimeline from 'app/twitter/fetchTimeline';
import createFakeTimelineServer from '../../support/createFakeTimelineServer';

describe('fetchTimeline', () => {
  let server;

  beforeEach(() => { server = createFakeTimelineServer(); });
  afterEach(() => { server.restore(); });

  const response = { tweets: [{ text: 'Hi!' }] };

  context('when timeline response is ok', () => {
    it('runs only the then callback', () => {
      server.stubGet('/twitter_timeline/thiagoaraujos', { status: 200, body: response });

      const promise = fetchTimeline('thiagoaraujos').catch(() => 'notMe');

      return promise.then((body) => {
        expect(body).to.deep.equal(response);
      });
    });

    it('chains then callbacks', () => {
      server.stubGet('/twitter_timeline/thiagoaraujos', { status: 200, body: response });

      const promise = fetchTimeline('thiagoaraujos').then((body) => {
        expect(body).to.deep.equal(response);
        return `${body.tweets[0].text} modified`;
      });

      return promise.then((modifiedBody) => {
        expect(modifiedBody).to.equal('Hi! modified');
      });
    });
  });
});