react-native/local-cli/rnpm/link/test/promiseWaterfall.spec.js

38 lines
997 B
JavaScript

const chai = require('chai');
const expect = chai.expect;
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])).to.be.true;
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).to.equal(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).to.equal(error);
expect(tasks[1].callCount).to.equal(0);
done();
});
});
});