38 lines
997 B
JavaScript
38 lines
997 B
JavaScript
const chai = require('chai');
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const expect = chai.expect;
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const sinon = require('sinon');
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const promiseWaterfall = require('../src/promiseWaterfall');
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describe('promiseWaterfall', () => {
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it('should run promises in a sequence', (done) => {
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const tasks = [sinon.stub(), sinon.stub()];
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promiseWaterfall(tasks).then(() => {
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expect(tasks[0].calledBefore(tasks[1])).to.be.true;
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done();
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});
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});
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it('should resolve with last promise value', (done) => {
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const tasks = [sinon.stub().returns(1), sinon.stub().returns(2)];
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promiseWaterfall(tasks).then(value => {
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expect(value).to.equal(2);
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done();
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});
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});
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it('should stop the sequence when one of promises is rejected', (done) => {
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const error = new Error();
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const tasks = [sinon.stub().throws(error), sinon.stub().returns(2)];
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promiseWaterfall(tasks).catch(err => {
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expect(err).to.equal(error);
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expect(tasks[1].callCount).to.equal(0);
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done();
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});
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});
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});
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