test: harden test-child-process-fork-regr-gh-2847

test/parallel/test-child-process-fork-regr-gh-2847.js

@@ -7,6 +7,9 @@ const cluster = require('cluster');
 const net = require('net');
 const util = require('util');
 
+var connectcount = 0;
+var sendcount = 0;
+
 if (!cluster.isMaster) {
   // Exit on first received handle to leave the queue non-empty in master
   process.on('message', function() {
@@ -25,6 +28,21 @@ var server = net.createServer(function(s) {
   function send(callback) {
     var s = net.connect(common.PORT, function() {
       worker.send({}, s, callback);
+      connectcount++;
+    });
+
+    // Errors can happen if the connections
+    // are still happening while the server has been closed.
+    // This can happen depending on how the messages are
+    // bundled into packets. If they all make it into the first
+    // one then no errors will occur, otherwise the server
+    // may have been closed by the time the later ones make
+    // it to the server side.
+    // We ignore any errors that occur after some connections
+    // get through
+    s.on('error', function(err) {
+      if (connectcount < 3)
+        console.log(err);
     });
   }
 
@@ -36,5 +54,9 @@ var server = net.createServer(function(s) {
 
   // Queue up several handles, to make `process.disconnect()` wait
   for (var i = 0; i < 100; i++)
-    send();
+    send(function(err) {
+      if (err && sendcount < 3)
+        console.log(err);
+      sendcount++;
+    });
 });