code: function (testOverride) {
      var ret = '127.0.0.1'
      os = testOverride || os
      var interfaces = os.networkInterfaces()
  
      Object.keys(interfaces).forEach(function (el) {
        interfaces[el].forEach(function (el2) {
          if (!el2.internal && el2.family === 'IPv4') {
            ret = el2.address
          }
        })
      })
  
      return ret
    }
docs: get server address from network interface