49 lines
1.2 KiB
JavaScript
49 lines
1.2 KiB
JavaScript
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* All rights reserved.
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*
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* @emails oncall+javascript_foundation
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*/
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'use strict';
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const sinon = require('sinon');
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const promiseWaterfall = require('../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])).toBeTruthy();
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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).toEqual(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).toEqual(error);
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expect(tasks[1].callCount).toEqual(0);
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done();
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});
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});
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});
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