35 lines
857 B
JavaScript
35 lines
857 B
JavaScript
import { expect } from 'chai'
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import u from '../lib'
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describe('u.withDefault', () => {
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it('uses the default as the basis for the update if the object is undefined', () => {
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const inc = (x) => x + 1
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const result = u.withDefault({ a: 0 }, { a: inc }, undefined)
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expect(result).to.eql({ a: 1 })
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})
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it('uses ignores the default if the object is defined', () => {
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const inc = (x) => x + 1
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const result = u.withDefault({ a: 0 }, { a: inc }, { a: 3 })
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expect(result).to.eql({ a: 4 })
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})
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it('can be partially applied', () => {
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const object = {}
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const result = u(
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{
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foo: u.withDefault([], { 0: 'bar' }),
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},
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object
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)
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expect(result).to.eql({ foo: ['bar'] })
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})
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it('freezes the result', () => {
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expect(Object.isFrozen(u.withDefault({}, { a: 1 })(undefined))).to.be.true
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})
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})
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