12345678910111213141516171819202122232425262728
import {difference} from './difference'import {difference as differenceRamda} from 'ramda'
test('difference', () => {  const a = [1, 2, 3, 4]  const b = [3, 4, 5, 6]  expect(difference(a)(b)).toEqual([1, 2])
  expect(difference([], [])).toEqual([])})
test('difference with objects', () => {  const a = [{id: 1}, {id: 2}, {id: 3}, {id: 4}]  const b = [{id: 3}, {id: 4}, {id: 5}, {id: 6}]  expect(difference(a, b)).toEqual([{id: 1}, {id: 2}])})
test('no duplicates in first list', () => {  const M2 = [1, 2, 3, 4, 1, 2, 3, 4]  const N2 = [3, 3, 4, 4, 5, 5, 6, 6]  expect(difference(M2, N2)).toEqual([1, 2])})
test('should use R.equals', () => {  expect(difference([1], [1]).length).toEqual(0)  expect(differenceRamda([NaN], [NaN]).length).toEqual(0)})