yarn-error.log

Arguments: 
  /usr/local/bin/node /usr/local/bin/yarn add --dev jest

PATH: 
  /Library/Frameworks/Python.framework/Versions/3.6/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/share/dotnet:/opt/X11/bin:~/.dotnet/tools:/Library/Frameworks/Mono.framework/Versions/Current/Commands:/usr/local/git/bin:/Library/Frameworks/Python.framework/Versions/3.6/bin:/Users/tonman-pc/.rvm/bin

Yarn version: 
  1.0.0

Node version: 
  11.0.0

Platform: 
  darwin x64

npm manifest: 
  {
    "name": "tddlab1",
    "version": "1.0.0",
    "description": "",
    "main": "index.js",
    "scripts": {
      "test": "jest",
      "start": "nodemon ./romanNumber/romanNumber.js"
    },
    "author": "",
    "license": "ISC"
  }

yarn manifest: 
  No manifest

Lockfile: 
  No lockfile

Trace: 
  Error: http://172.16.1.252:4873/jest: ETIMEDOUT
      at Timeout._onTimeout (/usr/local/lib/node_modules/yarn/lib/cli.js:117940:19)
      at listOnTimeout (timers.js:324:15)
      at processTimers (timers.js:268:5)