moy-fp/test/Logic/complement.test.js

A functional programming library.

import __ from '../../src/Function/__'
/**
 * ((a, b, ..., m) -> n) -> ((a, b, ..., m) -> Boolean)
 */
import complement from '../../src/Logic/complement'

test('complement(not using __), return true', () => {
  expect(
    complement(x => x - 3)(3)
  ).toBeTruthy()
})

test('complement(not using __), return false', () => {
  expect(
    complement(x => x - 3)(4)
  ).toBeFalsy()
})

test('complement(using __), return true', () => {
  expect(
    complement(__)(x => x - 3)(3)
  ).toBeTruthy()
})