test: rename test-regress-nodejsGH-3542

Rename the test appropriately alongside mentioning the subsystem
Also, make a few basic changes to make sure the test conforms
to the standard test structure

Refs: nodejs#19105
Refs: https://github.com/nodejs/node/blob/master/doc/guides/writing-tests.md#test-structure

test/parallel/test-regress-GH-3542.js → test/parallel/test-fs-readfilesync-enoent.js

@@ -1,13 +1,19 @@
 'use strict';
 const common = require('../common');
+
+// This test ensures fs.realpathSync works on properly on Windows without
+// throwing ENOENT when the path involves a fileserver
+// https://github.com/nodejs/node-v0.x-archive/issues/3542
+
 // This test is only relevant on Windows.
-if (!common.isWindows)
-  common.skip('Windows specific test.');
 
 const assert = require('assert');
 const fs = require('fs');
 const path = require('path');
 
+if (!common.isWindows)
+  common.skip('Windows specific test.');
+
 function test(p) {
   const result = fs.realpathSync(p);
   assert.strictEqual(result.toLowerCase(), path.resolve(p).toLowerCase());