old_contents: // ChaiAsPromised setup
  //
  var chai = require('chai'),
      chaiAsPromised = require('chai-as-promised');
  
  chai.use(chaiAsPromised);
  
  // http://derpturkey.com/testing-asyncawait-with-babel-and-mocha
  //
  var STAGE = require('../package.json').config.stage;
  
  require('babel/register')({
    stage: STAGE,
    sourceMaps: 'inline'
  });
  
  // Unhandled rejection handling
  //
  /* istanbul ignore next */
  process.on('unhandledRejection', function(reason) {
    console.log('Unhandled Rejection, reason:', reason);
    if (reason.stack) {
      console.err(reason.stack);
    }
  });
  
new_contents: // ChaiAsPromised setup
  //
  var chai = require('chai'),
      chaiAsPromised = require('chai-as-promised');
  
  chai.use(chaiAsPromised);
  
  // http://derpturkey.com/testing-asyncawait-with-babel-and-mocha
  //
  var STAGE = require('../package.json').config.stage;
  
  require('babel/register')({
    stage: STAGE,
    sourceMaps: 'inline',
    optional: ['runtime']
  });
  
  // Unhandled rejection handling
  //
  /* istanbul ignore next */
  process.on('unhandledRejection', function(reason) {
    console.log('Unhandled Rejection, reason:', reason);
    if (reason.stack) {
      console.err(reason.stack);
    }
  });
  
subject: Add runtime to mocha babel