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

A functional programming library.

import __ from '../../src/Function/__'
/**
 * [a] -> [a] -> [a]
 */
import union from '../../src/Relation/union'

test('union(not using __), first empty array', () => {
  expect(
    union([])([{a: 1}, {a: 2}, {a: 3}])
  ).toEqual([{a: 1}, {a: 2}, {a: 3}])
})

test('union(not using __), second empty array', () => {
  expect(
    union([{a: 1}, {a: 2}, {a: 3}])([])
  ).toEqual([{a: 1}, {a: 2}, {a: 3}])
})

test('union(not using __), no empty array', () => {
  expect(
    union([{a: 2}, {a: 4}])([{a: 1}, {a: 2}, {a: 3}, {a: 1}])
  ).toEqual([{a: 1}, {a: 2}, {a: 3}, {a: 4}])
})

test('union(not using __), no empty array and mix item type', () => {
  expect(
    union([false, 2, {a: 2}, [2], {a: 4}])(['false', {a: 1}, '2', {a: 3}, {a: 2}])
  ).toEqual(['false', {a: 1}, '2', {a: 3}, {a: 2}, false, 2, [2], {a: 4}])
})

test('union(using __), no empty array', () => {
  expect(
    union(__, [{a: 1}, {a: 2}, {a: 3}, {a: 1}])([{a: 2}, {a: 4}])
  ).toEqual([{a: 1}, {a: 2}, {a: 3}, {a: 4}])
})