import { describe, expect, it, test } from '@jest/globals'
import { difference } from './difference.js'

describe('difference', () => {
  test('difference', () => {
    const a = new Set([1, 2])
    const b = new Set([2])
    const c = difference(a, b)
    expect(c).toEqual(new Set([1]))
  })

  it('support more than 2 arguments', () => {
    const a = new Set([1, 2, 3])
    const b = new Set([2])
    const c = new Set([3])
    const result = difference(a, b, c)
    expect(result).toEqual(new Set([1]))
  })
})