test: add common.noop, default for common.mustCall()

Export a new common.noop no-operation function for general use.
Allow using common.mustCall() without a fn argument to simplify
test cases.

Replace various non-op functions throughout tests with common.noop

PR-URL: https://github.com/nodejs/node/pull/12027
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Teddy Katz <teddy.katz@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Franziska Hinkelmann <franziska.hinkelmann@gmail.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/test/parallel/test-next-tick.js b/test/parallel/test-next-tick.js
index 896e895aa9..9c69efeb78 100644
--- a/test/parallel/test-next-tick.js
+++ b/test/parallel/test-next-tick.js
@@ -25,15 +25,15 @@ const assert = require('assert');
 
 process.nextTick(common.mustCall(function() {
   process.nextTick(common.mustCall(function() {
-    process.nextTick(common.mustCall(function() {}));
+    process.nextTick(common.mustCall());
   }));
 }));
 
 setTimeout(common.mustCall(function() {
-  process.nextTick(common.mustCall(function() {}));
+  process.nextTick(common.mustCall());
 }), 50);
 
-process.nextTick(common.mustCall(function() {}));
+process.nextTick(common.mustCall());
 
 const obj = {};