events: check if _events is an own property

Without this check it is possible to have the _events object shared
amongst instances.

Fixes #7157

Signed-off-by: Trevor Norris <trev.norris@gmail.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/test/simple/test-event-emitter-subclass.js b/test/simple/test-event-emitter-subclass.js
index 8a2e9c1564..60b4bf387d 100644
--- a/test/simple/test-event-emitter-subclass.js
+++ b/test/simple/test-event-emitter-subclass.js
@@ -53,3 +53,17 @@ process.on('exit', function() {
   assert.deepEqual(myee._events, {});
   console.log('ok');
 });
+
+
+function MyEE2() {
+  EventEmitter.call(this);
+}
+
+MyEE2.prototype = new EventEmitter();
+
+var ee1 = new MyEE2();
+var ee2 = new MyEE2();
+
+ee1.on('x', function () {});
+
+assert.equal(EventEmitter.listenerCount(ee2, 'x'), 0);