diff --git a/test/parallel/test-event-emitter-num-args.js b/test/parallel/test-event-emitter-num-args.js
index d1027befa3f4ad..53ac0f79c20333 100644
--- a/test/parallel/test-event-emitter-num-args.js
+++ b/test/parallel/test-event-emitter-num-args.js
@@ -4,15 +4,20 @@ const assert = require('assert');
 const events = require('events');
 
 const e = new events.EventEmitter();
-const num_args_emited = [];
+const num_args_emitted = [];
 
 e.on('numArgs', function() {
   const numArgs = arguments.length;
-  console.log('numArgs: ' + numArgs);
-  num_args_emited.push(numArgs);
+  num_args_emitted.push(numArgs);
 });
 
-console.log('start');
+e.on('foo', function() {
+  num_args_emitted.push(arguments.length);
+});
+
+e.on('foo', function() {
+  num_args_emitted.push(arguments.length);
+});
 
 e.emit('numArgs');
 e.emit('numArgs', null);
@@ -21,6 +26,8 @@ e.emit('numArgs', null, null, null);
 e.emit('numArgs', null, null, null, null);
 e.emit('numArgs', null, null, null, null, null);
 
+e.emit('foo', null, null, null, null);
+
 process.on('exit', function() {
-  assert.deepStrictEqual([0, 1, 2, 3, 4, 5], num_args_emited);
+  assert.deepStrictEqual([0, 1, 2, 3, 4, 5, 4, 4], num_args_emitted);
 });
diff --git a/test/parallel/test-event-emitter-remove-all-listeners.js b/test/parallel/test-event-emitter-remove-all-listeners.js
index 38f9b7101eb775..d7865b09abe9f5 100644
--- a/test/parallel/test-event-emitter-remove-all-listeners.js
+++ b/test/parallel/test-event-emitter-remove-all-listeners.js
@@ -77,3 +77,8 @@ function listener() {}
   ee.removeAllListeners('baz');
   assert.strictEqual(ee.listeners('baz').length, 0);
 }
+
+{
+  const ee = new events.EventEmitter();
+  assert.deepStrictEqual(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..03bde6c3d7c4c9 100644
--- a/test/parallel/test-event-emitter-remove-listeners.js
+++ b/test/parallel/test-event-emitter-remove-listeners.js
@@ -116,6 +116,12 @@ function listener2() {}
   ee.emit('hello');
 }
 
+{
+  const ee = new EventEmitter();
+
+  assert.deepStrictEqual(ee, ee.removeListener('foo', () => {}));
+}
+
 // Verify that the removed listener must be a function
 assert.throws(() => {
   const ee = new EventEmitter();
diff --git a/test/parallel/test-event-emitter-special-event-names.js b/test/parallel/test-event-emitter-special-event-names.js
index d71d819d3031b2..7ff781f0f90c5a 100644
--- a/test/parallel/test-event-emitter-special-event-names.js
+++ b/test/parallel/test-event-emitter-special-event-names.js
@@ -7,6 +7,8 @@ const assert = require('assert');
 const ee = new EventEmitter();
 const handler = () => {};
 
+assert.deepStrictEqual(ee.eventNames(), []);
+
 assert.strictEqual(ee._events.hasOwnProperty, undefined);
 assert.strictEqual(ee._events.toString, undefined);
 
diff --git a/test/parallel/test-fs-read-file-assert-encoding.js b/test/parallel/test-fs-read-file-assert-encoding.js
new file mode 100644
index 00000000000000..897bcd3bc98795
--- /dev/null
+++ b/test/parallel/test-fs-read-file-assert-encoding.js
@@ -0,0 +1,13 @@
+'use strict';
+require('../common');
+
+const assert = require('assert');
+const fs = require('fs');
+
+const encoding = 'foo-8';
+const filename = 'bar.txt';
+
+assert.throws(
+  fs.readFile.bind(fs, filename, { encoding }, () => {}),
+  new RegExp(`Error: Unknown encoding: ${encoding}$`)
+);