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import { zip } from './zip'
const array1 = [ 1, 2, 3 ]const array2 = [ 'A', 'B', 'C' ]
test('should return an array', () => {  const actual = zip(array1)(array2)  expect(actual).toBeInstanceOf(Array)})
test('should return and array or tuples', () => {  const expected = [    [ 1, 'A' ],    [ 2, 'B' ],    [ 3, 'C' ],  ]  const actual = zip(array1, array2)  expect(actual).toEqual(expected)})
test('should truncate result to length of shorted input list', () => {  const expectedA = [    [ 1, 'A' ],    [ 2, 'B' ],  ]  const actualA = zip([ 1, 2 ], array2)  expect(actualA).toEqual(expectedA)
  const expectedB = [    [ 1, 'A' ],    [ 2, 'B' ],  ]  const actualB = zip(array1, [ 'A', 'B' ])  expect(actualB).toEqual(expectedB)})