old_contents: /* global describe, it, expect */
  
  import React from 'react';
  import { shallow } from 'enzyme';
  import Dropdown from '../src/Dropdown';
  import Button from '../src/Button';
  
  let wrapper = shallow(
    <Dropdown trigger={<Button>Drop me!</Button>} />
  );
  
  describe('<Collection />', () => {
    it('renders a dropdown', () => {
      expect(wrapper.find('.dropdown-content')).to.have.length(1);
    });
  });
  
new_contents: /* global describe, it, expect */
  
  import React from 'react';
  import { shallow } from 'enzyme';
  import Dropdown from '../src/Dropdown';
  import Button from '../src/Button';
  
  let wrapper = shallow(
    <Dropdown trigger={<Button>Drop me!</Button>} />
  );
  
  describe('<Dropdown />', () => {
    it('renders a dropdown', () => {
      expect(wrapper.find('.dropdown-content')).to.have.length(1);
    });
  });
  
subject: Update dropdown spec WIP