old_contents: 'use strict'
  
  ;['master', 'worker', 'utils', 'marshaller', 'types/error'].forEach((file) => {
    require(`./${file}`)
  })
  
new_contents: 'use strict'
  
  ;['env',
    'master',
    'worker',
    'utils',
    'marshaller',
    'types/error'].forEach((file) => {
    require(`./${file}`)
  })
  
subject: Include env test