import { expect } from 'chai' import u from '../lib' describe('u.if', () => { it('does not update if the predicate is false', () => { const object = { a: 0 } let result = u.if(false, { b: 1 }, object) expect(result).to.eql(object) result = u({ x: u.if(false, 1) }, {}) expect(result).to.eql({}) }) it('does update if the predicate is true', () => { const object = { a: 0 } const result = u.if(true, { b: 1 }, object) expect(result).to.eql({ a: 0, b: 1 }) }) it('will use the result of a function passed as a predicate', () => { const object = { a: 0 } const aIsThree = x => x.a === 3 const result = u.if(aIsThree, { b: 1 }, object) expect(result).to.eql({ a: 0 }) }) it('can be partially applied', () => { const object = { a: 2 } const isEven = x => x % 2 === 0 const inc = x => x + 1 const result = u( { a: u.if(isEven, inc), }, object ) expect(result).to.eql({ a: 3 }) }) it('freezes the result', () => { expect(Object.isFrozen(u.if(true, {}, {}))).to.be.true expect(Object.isFrozen(u.if(false, {}, {}))).to.be.true }) })