updeep-remeda/test/withDefault-spec.js

import { expect } from 'chai'
import u from '../lib'

describe('u.withDefault', () => {
  it('uses the default as the basis for the update if the object is undefined', () => {
    const inc = (x) => x + 1
    const result = u.withDefault({ a: 0 }, { a: inc }, undefined)

    expect(result).to.eql({ a: 1 })
  })

  it('uses ignores the default if the object is defined', () => {
    const inc = (x) => x + 1
    const result = u.withDefault({ a: 0 }, { a: inc }, { a: 3 })

    expect(result).to.eql({ a: 4 })
  })

  it('can be partially applied', () => {
    const object = {}
    const result = u(
      {
        foo: u.withDefault([], { 0: 'bar' }),
      },
      object
    )

    expect(result).to.eql({ foo: ['bar'] })
  })

  it('freezes the result', () => {
    expect(Object.isFrozen(u.withDefault({}, { a: 1 })(undefined))).to.be.true
  })
})