moy-fp/test/Math/dec.test.js

A functional programming library.

import __ from '../../src/Function/__'
/**
 * Number -> Number
 */
import dec from '../../src/Math/dec'

test('dec(not using __', () => {
  expect(
    dec(3)
  ).toBe(2)
})

test('dec(using __)', () => {
  expect(
    dec(__)(3)
  ).toBe(2)
})