Lazy variables inside hooks

spec.js

describe('Article', function() {
  def('article', function() {
    return new Article({ type: 'news', });
  });
  
  before(function() {
    article.id = 1; // first instance
  });
  
  before(function() {
    console.log(article.id); // 1
  });
  
  beforeEach(function() {
    console.log(article.id); // undefined, new variable
    article.id = 2; // second instance
  });
  
  it('uses the instance created in "beforeEach" block', function() {
    expect(article.id).to.equal(2); // true
  });
  
  afterEach(function() {
    console.log(article.id); // 2, same instance
  });
  
  after(function() {
    console.log(article.id); // undefined, new instance
    article.id = 3;
  });
  
  after(function() {
    console.log(article.id); // 3, instance from `after` callback
  });
});