text: const assert = require('assert')
  const _ = require('../Exlodash')
  
  describe('test difference', () => {
      it('result should be [1]', () => {
          assert.deepStrictEqual(_.difference([2, 1], [2, 3]), [1])
      })
      it('result should not be [2]', () => {
          assert.notDeepStrictEqual(_.difference([2, 1], [2, 3]), [2])
      })
  })