From c16160418b30e6616bf7b9a3efd83dc419e5b5f5 Mon Sep 17 00:00:00 2001
From: matsuda-koushi <cauchymazda@r.recruit.co.jp>
Date: Fri, 3 Feb 2017 15:59:12 +0900
Subject: [PATCH] test: improve coverage on removeListeners functions

PR-URL: https://github.com/nodejs/node/pull/11140
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Italo A. Casas <me@italoacasas.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
---
 .../test-event-emitter-remove-all-listeners.js        | 11 +++++++++++
 test/parallel/test-event-emitter-remove-listeners.js  |  8 ++++++++
 2 files changed, 19 insertions(+)

diff --git a/test/parallel/test-event-emitter-remove-all-listeners.js b/test/parallel/test-event-emitter-remove-all-listeners.js
index e32a0e3f94f5b4..1970904df25a75 100644
--- a/test/parallel/test-event-emitter-remove-all-listeners.js
+++ b/test/parallel/test-event-emitter-remove-all-listeners.js
@@ -77,3 +77,14 @@ function listener() {}
   ee.removeAllListeners('baz');
   assert.strictEqual(ee.listeners('baz').length, 0);
 }
+
+{
+  const ee = new events.EventEmitter();
+  assert.deepStrictEqual(ee, ee.removeAllListeners());
+}
+
+{
+  const ee = new events.EventEmitter();
+  ee._events = undefined;
+  assert.strictEqual(ee, ee.removeAllListeners());
+}
diff --git a/test/parallel/test-event-emitter-remove-listeners.js b/test/parallel/test-event-emitter-remove-listeners.js
index ff5ee5dc242e0f..55108f753c7a15 100644
--- a/test/parallel/test-event-emitter-remove-listeners.js
+++ b/test/parallel/test-event-emitter-remove-listeners.js
@@ -122,3 +122,11 @@ assert.throws(() => {
 
   ee.removeListener('foo', null);
 }, /^TypeError: "listener" argument must be a function$/);
+
+{
+  const ee = new EventEmitter();
+  const listener = () => {};
+  ee._events = undefined;
+  const e = ee.removeListener('foo', listener);
+  assert.strictEqual(e, ee);
+}