Updated test

test/utils/buildServer.js

@@ -26,6 +26,10 @@ function buildServer (handler, opts, cb) {
     : stoppable(http.createServer())
 
   server.on('request', handler)
+  server.on('error', err => {
+    console.log('http server error', err)
+    process.exit(1)
+  })
   server.listen(0, () => {
     const port = server.address().port
     cb(Object.assign({}, secureOpts, { port }), server)