test: move buffer-as-path symlink test to its own test file

The buffer-as-path test for fs.symlinkSync() is a bit unusual and
potentially error-prone embedded in the general fs.symlink() test. Move
it to its own test file.

Refs: https://github.com/nodejs/node/pull/34540/files#r463168354

PR-URL: #34569
Reviewed-By: Pranshu Srivastava <rexagod@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Gerhard Stöbich <deb2001-github@yahoo.de>

Author: Trott

test/parallel/test-fs-symlink-buffer-path.js

@@ -0,0 +1,63 @@
+// Copyright Joyent, Inc. and other Node contributors.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to permit
+// persons to whom the Software is furnished to do so, subject to the
+// following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
+// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+// USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+'use strict';
+const common = require('../common');
+if (!common.canCreateSymLink())
+  common.skip('insufficient privileges');
+
+const fixtures = require('../common/fixtures');
+
+const assert = require('assert');
+const path = require('path');
+const fs = require('fs');
+
+const tmpdir = require('../common/tmpdir');
+tmpdir.refresh();
+
+// Test creating and reading symbolic link
+const linkData = fixtures.path('/cycles/root.js');
+const linkPath = path.join(tmpdir.path, 'symlink1.js');
+
+let linkTime;
+let fileTime;
+
+// Refs: https://github.com/nodejs/node/issues/34514
+fs.symlinkSync(Buffer.from(linkData), linkPath);
+
+fs.lstat(linkPath, common.mustCall(function(err, stats) {
+  assert.ifError(err);
+  linkTime = stats.mtime.getTime();
+}));
+
+fs.stat(linkPath, common.mustCall(function(err, stats) {
+  assert.ifError(err);
+  fileTime = stats.mtime.getTime();
+}));
+
+fs.readlink(linkPath, common.mustCall(function(err, destination) {
+  assert.ifError(err);
+  assert.strictEqual(destination, linkData);
+}));
+
+process.on('exit', () => {
+  assert.notStrictEqual(linkTime, fileTime);
+});

test/parallel/test-fs-symlink.js

@@ -56,10 +56,6 @@ fs.symlink(linkData, linkPath, common.mustCall(function(err) {
     assert.ifError(err);
     assert.strictEqual(destination, linkData);
   }));
-
-  tmpdir.refresh();
-  // Refs: https://github.com/nodejs/node/issues/34514
-  fs.symlinkSync(Buffer.from(linkData), linkPath);
 }));
 
 // Test invalid symlink
@@ -96,6 +92,6 @@ const errObj = {
 assert.throws(() => fs.symlink('', '', '🍏', common.mustNotCall()), errObj);
 assert.throws(() => fs.symlinkSync('', '', '🍏'), errObj);
 
-process.on('exit', function() {
+process.on('exit', () => {
   assert.notStrictEqual(linkTime, fileTime);
 });