45 lines
1016 B
JavaScript
45 lines
1016 B
JavaScript
import { expect } from 'chai'
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import u from '../lib'
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describe('u.reject', () => {
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it('can reject by index', () => {
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const result = u.reject((_, index) => index === 1, [3, 4, 5])
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expect(result).to.eql([3, 5])
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})
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it('can reject with callback shorthand', () => {
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const result = u.reject('bad', [{ bad: true }, { bad: false }])
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expect(result).to.eql([{ bad: false }])
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})
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it("returns the same instance if reject doesn't make changes", () => {
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const object = { foo: [1, 2, 3] }
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const result = u(
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{
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foo: u.reject((x) => x === 'Justin Bieber'),
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},
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object
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)
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expect(result).to.equal(object)
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})
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it('returns a different instance if reject makes changes', () => {
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const object = { foo: [1, 2, 3, 4] }
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const result = u(
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{
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foo: u.reject((x) => x === 4),
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},
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object
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)
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expect(result).to.not.equal(object)
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})
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it('freezes the result', () => {
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expect(Object.isFrozen(u.reject('a', []))).to.be.true
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})
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})
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