text: const a = 'hello world'
  
  const b = a.split()
  const c = a.split('')
  const d = a.split(' ')
  const e = a.split('  ')
  const f = a.split('l')
  
  test('', function() {
    expect(b).toEqual(['hello world'])
    expect(c).toEqual(['h', 'e', 'l', 'l', 'o', ' ', 'w', 'o', 'r', 'l', 'd'])
    expect(d).toEqual(['hello', 'world'])
    expect(e).toEqual(['hello world'])
    expect(f).toEqual(['he', '', 'o wor', 'd'])
  })
  