add process with no listener

tests/apps/nodejs-express/Procfile

@@ -1,2 +1,3 @@
+cron: node worker.js
 web: node web.js
-worker: node web.js
+worker: node worker.js

tests/apps/nodejs-express/web.js

@@ -9,4 +9,4 @@ app.get('/', function(request, response) {
 var port = process.env.PORT || 5000;
 app.listen(port, function() {
   console.log("Listening on " + port);
-});
+});

tests/apps/nodejs-express/worker.js

@@ -0,0 +1,6 @@
+function worker() {
+  console.log('sleeping for 60 seconds');
+  setTimeout(worker, 60 * 1000);
+}
+
+worker();