66 lines
1.7 KiB
JavaScript
66 lines
1.7 KiB
JavaScript
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const chai = require('chai')
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const chaiAsPromised = require('chai-as-promised')
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const tryEach = require('../src/utils/tryEach')
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chai.use(chaiAsPromised)
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const { expect } = chai
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describe('tryEach', () => {
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it('should work with the first element', async () => {
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// given
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const array = [1, 2, 3]
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const f = x => (x === 1 ? Promise.resolve(2 * x) : Promise.reject())
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// when
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const [result, index] = await tryEach(array, f)
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// then
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expect(result).to.equal(2)
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expect(index).to.equal(0)
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})
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it('should work with the second element', async () => {
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// given
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const array = [1, 2, 3]
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const f = x => (x === 2 ? Promise.resolve(2 * x) : Promise.reject())
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// when
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const [result, index] = await tryEach(array, f)
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// then
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expect(result).to.equal(4)
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expect(index).to.equal(1)
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})
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it('should work with the last element', async () => {
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// given
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const array = [1, 2, 3]
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const f = x => (x === array[array.length - 1] ? Promise.resolve(2 * x) : Promise.reject())
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// when
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const [result, index] = await tryEach(array, f)
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// then
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expect(result).to.equal(6)
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expect(index).to.equal(2)
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})
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it('should return array with errors if all elements fail', async () => {
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// given
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const array = [1, 2, 3]
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const f = x => Promise.reject(-x) // eslint-disable-line prefer-promise-reject-errors
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// when
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return expect(tryEach(array, f)).to.be.rejected.and.eventually.deep.equal([-1, -2, -3])
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})
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it('should return an empty array if input array is empty', async () => {
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// given
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const array = []
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const f = x => Promise.resolve(x)
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// when
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return expect(tryEach(array, f)).to.be.rejected.and.eventually.deep.equal([])
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})
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})
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