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

A functional programming library.

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

test('negate(not using __), positive number', () => {
  expect(
    negate(10)
  ).toBe(-10)
})

test('negate(not using __), negative number', () => {
  expect(
    negate(-10)
  ).toBe(10)
})

test('negate(not using __), zero', () => {
  expect(
    negate(0)
  ).toBe(0)
})

test('negate(using __), positive number', () => {
  expect(
    negate(__)(10)
  ).toBe(-10)
})