text: import { curry } from './curry'
  
  test('', () => {
    const addFourNumbers = (a, b, c, d) => a + b + c + d
    const curriedAddFourNumbers = curry(addFourNumbers)
    const f = curriedAddFourNumbers(1, 2)
    const g = f(3)
  
    expect(g(4)).toEqual(10)
  })
  
  test('when called with more arguments', () => {
    const add = curry((n, n2) => n + n2)
  
    expect(add(1, 2, 3)).toEqual(3)
  })
  
  test('when called with zero arguments', () => {
    const sub = curry((a, b) => a - b)
    const s0 = sub()
  
    expect(s0(5, 2)).toEqual(3)
  })
  
  test('when called via multiple curry stages', () => {
    const join = curry((a, b, c, d) => [ a, b, c, d ].join('-'))
  
    const stage1 = join('A')
    const stage2 = stage1('B', 'C')
  
    expect(stage2('D')).toEqual('A-B-C-D')
  })
  