old_contents: 'use strict'
  
  module.exports = {
    hooks: {
      'pre-commit': 'npm run lint',
      'pre-push': 'npm run lint && npm test',
    },
  }
  
new_contents: 'use strict'
  
  module.exports = {
    hooks: {
      'pre-commit': 'npm run lint',
      'pre-push': 'npm run lint && npm build && npm test',
    },
  }
  
subject: Add build step to pre-push git hook