From 5e095f699e2f7253cd151c0a829dd020c78d2487 Mon Sep 17 00:00:00 2001
From: cjihrig <cjihrig@gmail.com>
Date: Tue, 18 Apr 2017 21:30:53 -0400
Subject: [PATCH] test: verify listener leak is only emitted once

When a possible listener leak is detected, a warning is
emitted. This commit updates an existing test to verify that the
warning is only emitted once.

PR-URL: https://github.com/nodejs/node/pull/12502
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
---
 test/parallel/test-event-emitter-max-listeners-warning.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/test/parallel/test-event-emitter-max-listeners-warning.js b/test/parallel/test-event-emitter-max-listeners-warning.js
index 42532543529087..1a4a1b8bf2af03 100644
--- a/test/parallel/test-event-emitter-max-listeners-warning.js
+++ b/test/parallel/test-event-emitter-max-listeners-warning.js
@@ -19,4 +19,5 @@ process.on('warning', common.mustCall((warning) => {
 }));
 
 e.on('event-type', common.noop);
-e.on('event-type', common.noop);
+e.on('event-type', common.noop);  // Trigger warning.
+e.on('event-type', common.noop);  // Verify that warning is emitted only once.