old_contents: import 'babel-polyfill';
  import * as should from '../node_modules/should';
  import './base';
  import './monad';
  import './tuple';
  import './list';
  
new_contents: import 'babel-polyfill';
  import * as should from '../node_modules/should';
  import './base';
  import './monad';
  import './maybe';
  import './tuple';
  import './list';
  
subject: Create Maybe test file