48 lines
1.1 KiB
JavaScript
48 lines
1.1 KiB
JavaScript
import { expect } from 'chai'
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import u from '../lib'
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describe('u.if', () => {
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it('does not update if the predicate is false', () => {
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const object = { a: 0 }
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let result = u.if(false, { b: 1 }, object)
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expect(result).to.eql(object)
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result = u({ x: u.if(false, 1) }, {})
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expect(result).to.eql({})
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})
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it('does update if the predicate is true', () => {
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const object = { a: 0 }
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const result = u.if(true, { b: 1 }, 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.if(aIsThree, { b: 1 }, object)
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expect(result).to.eql({ a: 0 })
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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 result = u(
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{
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a: u.if(isEven, inc),
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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.if(true, {}, {}))).to.be.true
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expect(Object.isFrozen(u.if(false, {}, {}))).to.be.true
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})
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})
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