text: 'use strict';
  
  jest.autoMockOff();
  
  const sinon = require('sinon');
  const promiseWaterfall = require('../src/promiseWaterfall');
  
  describe('promiseWaterfall', () => {
  
    it('should run promises in a sequence', (done) => {
      const tasks = [sinon.stub(), sinon.stub()];
  
      promiseWaterfall(tasks).then(() => {
        expect(tasks[0].calledBefore(tasks[1])).toBeTruthy();
        done();
      });
    });
  
    it('should resolve with last promise value', (done) => {
      const tasks = [sinon.stub().returns(1), sinon.stub().returns(2)];
  
      promiseWaterfall(tasks).then(value => {
        expect(value).toEqual(2);
        done();
      });
    });
  
    it('should stop the sequence when one of promises is rejected', (done) => {
      const error = new Error();
      const tasks = [sinon.stub().throws(error), sinon.stub().returns(2)];
  
      promiseWaterfall(tasks).catch(err => {
        expect(err).toEqual(error);
        expect(tasks[1].callCount).toEqual(0);
        done();
      });
    });
  
  });
  