moy-fp/test/List/concatList.test.js

A functional programming library.

import __ from '../../src/Function/__'
/**
 * [a] -> [a] -> [a]
 */
import concatList from '../../src/List/concatList'

test('concatList(not using __)', () => {
  expect(
    concatList([3, 4])([1, 2])
  ).toEqual([1, 2, 3, 4])
})

test('concatList(using __)', () => {
  expect(
    concatList(__, [1, 2])([3, 4])
  ).toEqual([1, 2, 3, 4])
})