Get a Browser Cookie

index.js

// @see http://stackoverflow.com/a/15724300
export default (cookieName) => {
  const value = `; ${document.cookie}`;
  const parts = value.split(`; ${cookieName}=`);

  if (parts.length === 2) {
    return parts.pop().split(';').shift();
  }
};

spec.js

import { expect } from 'chai';
import getBrowserCookie from './';

describe('getBrowserCookie', () => {
  beforeEach(() => {
    document.cookie = 'some-token=Some.Token1; tags=id:123456$_sn:60$_ss:0$_st:1234567$ses_id:123456%3Bexp-session$_pn:12%3Bexp-session; WTF=id=123abc:ab=123:cd=1234567';
  });

  it('will return undefined if it cannot find the cookie', () =>{
    expect(getBrowserCookie('something-that-does-exist')).to.equal(undefined);
  });

  it('should return the correct value of a cookie', () => {
    expect(getBrowserCookie('some-token')).to.equal('Some.Token1');
  });
});