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import { curry } from './curry.js'
test('happy', () => {  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)).toBe(10)})
test('when called with more arguments', () => {  const add = curry((n, n2) => n + n2)
  expect(add(    1, 2, 3  )).toBe(3)})
test('when called with zero arguments', () => {  const sub = curry((a, b) => a - b)  const s0 = sub()
  expect(s0(5, 2)).toBe(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')).toBe('A-B-C-D')})