moy-fp/test/Relation/equalsBy.test.js

A functional programming library.

import __ from '../../src/Function/__'
/**
 * (a -> b) -> a -> a -> Boolean
 */
import equalsBy from '../../src/Relation/equalsBy'

test('equals(not using __), not reference type, return false', () => {
  expect(
    equalsBy(Math.abs)(5)(-6)
  ).toBeFalsy()
})

test('equals(not using __), not reference type, return true', () => {
  expect(
    equalsBy(Math.abs)(5)(-5)
  ).toBeTruthy()
})

test('equals(not using __), reference type, return false', () => {
  expect(
    equalsBy(x => x.id)({id: 1})({id: 2})
  ).toBeFalsy()
})

test('equals(not using __), reference type, return true', () => {
  expect(
    equalsBy(x => x.id)({id: 1})({id: 1})
  ).toBeTruthy()
})

test('equals(using __), not reference type, return true', () => {
  expect(
    equalsBy(Math.abs, __, -5)(5)
  ).toBeTruthy()
})