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, 1 insertions, 1 deletions

diff --git a/test/parallel/test-repl-function-definition-edge-case.js b/test/parallel/test-repl-function-definition-edge-case.js
index 1e3063e3db..90234eb131 100644
--- a/test/parallel/test-repl-function-definition-edge-case.js
+++ b/test/parallel/test-repl-function-definition-edge-case.js
@@ -19,7 +19,7 @@ assert.strictEqual(got, expected);
 
 function initRepl() {
   const input = new stream();
-  input.write = input.pause = input.resume = () => {};
+  input.write = input.pause = input.resume = common.noop;
   input.readable = true;
 
   const output = new stream();