test: refactor test-fs-options-immutable

* Reorder require() statements per test-writing guide
* Use common.mustNotCall() to check that callback is not invoked
* Use common.mustCall() to check that callback is invoked

PR-URL: nodejs#13977
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>

test/parallel/test-fs-options-immutable.js

@@ -1,4 +1,5 @@
 'use strict';
+const common = require('../common');
 
 /*
  * These tests make sure that the `options` object passed to these functions are
@@ -7,10 +8,10 @@
  * Refer: https://github.com/nodejs/node/issues/7655
  */
 
-const common = require('../common');
 const assert = require('assert');
-const path = require('path');
 const fs = require('fs');
+const path = require('path');
+
 const errHandler = (e) => assert.ifError(e);
 const options = Object.freeze({});
 common.refreshTmpDir();
@@ -61,13 +62,15 @@ if (common.canCreateSymLink()) {
 {
   let watch;
   assert.doesNotThrow(() => {
-    watch = fs.watch(__filename, options, common.noop);
+    watch = fs.watch(__filename, options, common.mustNotCall());
   });
   watch.close();
 }
 
 {
-  assert.doesNotThrow(() => fs.watchFile(__filename, options, common.noop));
+  assert.doesNotThrow(
+    () => fs.watchFile(__filename, options, common.mustNotCall())
+  );
   fs.unwatchFile(__filename);
 }
 
@@ -89,8 +92,8 @@ if (common.canCreateSymLink()) {
 {
   const fileName = path.resolve(common.tmpDir, 'streams');
   assert.doesNotThrow(() => {
-    fs.WriteStream(fileName, options).once('open', () => {
+    fs.WriteStream(fileName, options).once('open', common.mustCall(() => {
       assert.doesNotThrow(() => fs.ReadStream(fileName, options));
-    });
+    }));
   });
 }