old_contents: 'use strict';
  
  import chai from 'chai';
  import sinon from 'sinon';
  import sinonChai from 'sinon-chai';
  import chaiAsPromised from 'chai-as-promised';
  import chaiEventEmitter from 'chai-eventemitter';
  import 'source-map-support/register';
  import 'trace';
  import 'clarify';
  import '../src/util/mixins';
  
  Error.stackTraceLimit = Infinity;
  
  global.expect = chai.expect;
  global.sinon = sinon;
  
  chai.use(sinonChai);
  chai.use(chaiAsPromised);
  chai.use(chaiEventEmitter);
  
new_contents: 'use strict';
  
  import chai from 'chai';
  import sinon from 'sinon';
  import sinonChai from 'sinon-chai';
  import chaiAsPromised from 'chai-as-promised';
  import chaiEventEmitter from 'chai-eventemitter';
  import 'source-map-support/register';
  import '../src/util/mixins';
  import 'async-listener';
  
  global.expect = chai.expect;
  global.sinon = sinon;
  
  chai.use(sinonChai);
  chai.use(chaiAsPromised);
  chai.use(chaiEventEmitter);
  
  
subject: remove unused modules from test fixture