const expect = require('expect');
const {unionWith} = require('./_30s.js');

test('unionWith is a Function', () => {
  expect(unionWith).toBeInstanceOf(Function);
});
test('Produces the appropriate results', () => {
  expect(
    unionWith([1, 1.2, 1.5, 3, 0], [1.9, 3, 0, 3.9], (a, b) => Math.round(a) === Math.round(b))
  ).toEqual([1, 1.2, 1.5, 3, 0, 3.9]);
});