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+const { expect } = require('chai')
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+const {
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+ promisifyAll,
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+ promisifyClass,
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+ callbackifyMultiResult,
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+ callbackifyAll,
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+} = require('../..')
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+
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+describe('promisifyAll', function () {
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+ describe('basic functionality', function () {
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+ before(function () {
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+ this.module = {
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+ SOME_CONSTANT: 1,
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+ asyncAdd(a, b, callback) {
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+ callback(null, a + b)
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+ },
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+ asyncDouble(x, callback) {
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+ this.asyncAdd(x, x, callback)
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+ },
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+ }
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+ this.promisified = promisifyAll(this.module)
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+ })
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+
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+ it('promisifies functions in the module', async function () {
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+ const sum = await this.promisified.asyncAdd(29, 33)
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+ expect(sum).to.equal(62)
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+ })
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+
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+ it('binds this to the original module', async function () {
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+ const sum = await this.promisified.asyncDouble(38)
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+ expect(sum).to.equal(76)
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+ })
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+
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+ it('does not copy over non-functions', async function () {
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+ expect(this.promisified).not.to.have.property('SOME_CONSTANT')
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+ })
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+
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+ it('does not modify the prototype of the module', async function () {
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+ expect(this.promisified.toString()).to.equal('[object Object]')
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+ })
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+ })
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+
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+ describe('without option', function () {
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+ before(function () {
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+ this.module = {
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+ asyncAdd(a, b, callback) {
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+ callback(null, a + b)
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+ },
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+ syncAdd(a, b) {
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+ return a + b
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+ },
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+ }
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+ this.promisified = promisifyAll(this.module, { without: ['syncAdd'] })
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+ })
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+
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+ it('does not promisify excluded functions', function () {
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+ expect(this.promisified.syncAdd).not.to.exist
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+ })
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+
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+ it('promisifies other functions', async function () {
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+ const sum = await this.promisified.asyncAdd(12, 89)
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+ expect(sum).to.equal(101)
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+ })
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+ })
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+
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+ describe('multiResult option', function () {
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+ before(function () {
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+ this.module = {
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+ asyncAdd(a, b, callback) {
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+ callback(null, a + b)
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+ },
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+ asyncArithmetic(a, b, callback) {
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+ callback(null, a + b, a * b)
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+ },
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+ }
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+ this.promisified = promisifyAll(this.module, {
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+ multiResult: { asyncArithmetic: ['sum', 'product'] },
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+ })
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+ })
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+
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+ it('promisifies multi-result functions', async function () {
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+ const result = await this.promisified.asyncArithmetic(3, 6)
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+ expect(result).to.deep.equal({ sum: 9, product: 18 })
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+ })
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+
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+ it('promisifies other functions normally', async function () {
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+ const sum = await this.promisified.asyncAdd(6, 1)
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+ expect(sum).to.equal(7)
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+ })
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+ })
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+})
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+
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+describe('promisifyClass', function () {
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+ describe('basic functionality', function () {
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+ before(function () {
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+ this.Class = class {
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+ constructor(a) {
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+ this.a = a
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+ }
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+
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+ asyncAdd(b, callback) {
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+ callback(null, this.a + b)
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+ }
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+ }
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+ this.Promisified = promisifyClass(this.Class)
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+ })
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+
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+ it('promisifies the class methods', async function () {
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+ const adder = new this.Promisified(1)
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+ const sum = await adder.asyncAdd(2)
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+ expect(sum).to.equal(3)
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+ })
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+ })
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+
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+ describe('without option', function () {
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+ before(function () {
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+ this.Class = class {
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+ constructor(a) {
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+ this.a = a
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+ }
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+
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+ asyncAdd(b, callback) {
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+ callback(null, this.a + b)
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+ }
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+
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+ syncAdd(b) {
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+ return this.a + b
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+ }
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+ }
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+ this.Promisified = promisifyClass(this.Class, { without: ['syncAdd'] })
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+ })
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+
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+ it('does not promisify excluded functions', function () {
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+ const adder = new this.Promisified(10)
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+ const sum = adder.syncAdd(12)
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+ expect(sum).to.equal(22)
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+ })
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+
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+ it('promisifies other functions', async function () {
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+ const adder = new this.Promisified(23)
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+ const sum = await adder.asyncAdd(3)
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+ expect(sum).to.equal(26)
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+ })
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+ })
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+
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+ describe('multiResult option', function () {
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+ before(function () {
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+ this.Class = class {
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+ constructor(a) {
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+ this.a = a
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+ }
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+
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+ asyncAdd(b, callback) {
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+ callback(null, this.a + b)
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+ }
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+
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+ asyncArithmetic(b, callback) {
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+ callback(null, this.a + b, this.a * b)
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+ }
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+ }
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+ this.Promisified = promisifyClass(this.Class, {
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+ multiResult: { asyncArithmetic: ['sum', 'product'] },
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+ })
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+ })
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+
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+ it('promisifies multi-result functions', async function () {
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+ const adder = new this.Promisified(3)
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+ const result = await adder.asyncArithmetic(6)
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+ expect(result).to.deep.equal({ sum: 9, product: 18 })
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+ })
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+
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+ it('promisifies other functions normally', async function () {
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+ const adder = new this.Promisified(6)
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+ const sum = await adder.asyncAdd(1)
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+ expect(sum).to.equal(7)
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+ })
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+ })
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+})
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+
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+describe('callbackifyMultiResult', function () {
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+ it('callbackifies a multi-result function', function (done) {
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+ async function asyncArithmetic(a, b) {
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+ return { sum: a + b, product: a * b }
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+ }
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+ const callbackified = callbackifyMultiResult(asyncArithmetic, [
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+ 'sum',
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+ 'product',
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+ ])
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+ callbackified(3, 11, (err, sum, product) => {
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+ if (err != null) {
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+ return done(err)
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+ }
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+ expect(sum).to.equal(14)
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+ expect(product).to.equal(33)
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+ done()
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+ })
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+ })
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+
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+ it('propagates errors', function (done) {
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+ async function asyncBomb() {
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+ throw new Error('BOOM!')
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+ }
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+ const callbackified = callbackifyMultiResult(asyncBomb, [
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+ 'explosives',
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+ 'dynamite',
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+ ])
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+ callbackified(err => {
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+ expect(err).to.exist
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+ done()
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+ })
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+ })
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+})
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+
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+describe('callbackifyAll', function () {
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+ describe('basic functionality', function () {
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+ before(function () {
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+ this.module = {
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+ SOME_CONSTANT: 1,
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+ async asyncAdd(a, b) {
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+ return a + b
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+ },
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+ async asyncDouble(x, callback) {
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+ return await this.asyncAdd(x, x)
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+ },
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+ dashConcat(a, b) {
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+ return `${a}-${b}`
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+ },
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+ }
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+ this.callbackified = callbackifyAll(this.module)
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+ })
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+
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+ it('callbackifies async functions in the module', function (done) {
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+ this.callbackified.asyncAdd(77, 18, (err, sum) => {
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+ if (err) {
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+ return done(err)
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+ }
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+ expect(sum).to.equal(95)
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+ done()
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+ })
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+ })
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+
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+ it('binds this to the original module', function (done) {
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+ this.callbackified.asyncDouble(20, (err, double) => {
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+ if (err) {
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+ return done(err)
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+ }
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+ expect(double).to.equal(40)
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+ done()
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+ })
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+ })
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+
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+ it('copies over regular functions', function () {
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+ const s = this.callbackified.dashConcat('ping', 'pong')
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+ expect(s).to.equal('ping-pong')
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+ })
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+
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+ it('copies over non-functions', function () {
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+ expect(this.callbackified.SOME_CONSTANT).to.equal(1)
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+ })
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+ })
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+
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+ describe('multiResult option', function () {
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+ before(function () {
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+ this.module = {
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+ async asyncAdd(a, b) {
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+ return a + b
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+ },
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+ async asyncArithmetic(a, b) {
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+ return { sum: a + b, product: a * b }
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+ },
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+ }
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+ this.callbackified = callbackifyAll(this.module, {
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+ multiResult: { asyncArithmetic: ['sum', 'product'] },
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+ })
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+ })
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+
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+ it('callbackifies multi-result functions', function (done) {
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+ this.callbackified.asyncArithmetic(4, 5, (err, sum, product) => {
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+ if (err) {
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+ return done(err)
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+ }
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+ expect(sum).to.equal(9)
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+ expect(product).to.equal(20)
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+ done()
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+ })
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+ })
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+
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+ it('callbackifies other functions normally', function (done) {
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+ this.callbackified.asyncAdd(77, 18, (err, sum) => {
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+ if (err) {
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+ return done(err)
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+ }
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+ expect(sum).to.equal(95)
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+ done()
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+ })
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+ })
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+ })
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+})
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