moy-fp/test/Functor/identity.test.js

A functional programming library.

import __ from '../../src/Function/__'
/**
 * Identity I => I a -> a
 */
import identity from '../../src/Functor/identity'
import Identity from '../../src/Functor/Identity/index'

test('identity(not using __)', () => {
  expect(
    identity(Identity.of(12))
  ).toBe(12)
})

test('identity(using __)', () => {
  expect(
    identity(__)(Identity.of(12))
  ).toBe(12)
})