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

A functional programming library.

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

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

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