46 lines
1.2 KiB
JavaScript
46 lines
1.2 KiB
JavaScript
import { expect } from 'chai'
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import u from '../lib'
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describe('u.ifElse', () => {
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it('does updates with the else if the predicate is false', () => {
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const object = { a: 0 }
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const result = u.ifElse(false, { b: 1 }, { b: 2 }, object)
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expect(result).to.eql({ a: 0, b: 2 })
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})
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it('updates with the true update if the predicate is true', () => {
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const object = { a: 0 }
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const result = u.ifElse(true, { b: 1 }, { b: 4 }, object)
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expect(result).to.eql({ a: 0, b: 1 })
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})
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it('will use the result of a function passed as a predicate', () => {
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const object = { a: 0 }
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const aIsThree = (x) => x.a === 3
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const result = u.ifElse(aIsThree, { b: 1 }, { b: 4 }, object)
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expect(result).to.eql({ a: 0, b: 4 })
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})
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it('can be partially applied', () => {
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const object = { a: 2 }
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const isEven = (x) => x % 2 === 0
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const inc = (x) => x + 1
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const dec = (x) => x - 1
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const result = u(
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{
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a: u.ifElse(isEven, inc, dec),
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},
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object
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)
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expect(result).to.eql({ a: 3 })
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})
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it('freezes the result', () => {
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expect(Object.isFrozen(u.ifElse(true, {}, {}, {}))).to.be.true
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expect(Object.isFrozen(u.ifElse(false, {}, {}, {}))).to.be.true
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})
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})
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