lux-framework/src/utils/test/pick.test.js

Build scalable, Node.js-powered REST APIs with almost no code.

// @flow
import { expect } from 'chai';
import { it, describe } from 'mocha';

import pick from '../pick';

describe('util pick()', () => {
  it('filters out keys that are not passed as arguments', () => {
    expect(pick({ a: 1, b: 2, c: 3 }, 'a', 'c')).to.deep.equal({ a: 1, c: 3 });
  });

  it('does not mutate the source object', () => {
    const subject = { a: 1, b: 2, c: 3 };

    pick(subject, 'a', 'c');

    expect(subject).to.deep.equal({ a: 1, b: 2, c: 3 });
  });
});