test: improve coverage on removeListeners functions

PR-URL: nodejs#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>
italoacasas · Feb 14, 2017 · e9f6bc6 · e9f6bc6
1 parent 8547871
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diff --git a/test/parallel/test-event-emitter-remove-all-listeners.js b/test/parallel/test-event-emitter-remove-all-listeners.js
@@ -82,3 +82,9 @@ function listener() {}
   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
@@ -128,3 +128,11 @@ 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);
+}