test: specify 'dir' for directory symlinks

Directory symlinks in Windows require the 'dir' flag to be passed to
create the symlink correctly.

PR-URL: nodejs/node#19049
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Khaidi Chu <i@2333.moe>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

test/addons/symlinked-module/test.js

@@ -18,7 +18,7 @@ const addonPath = path.join(__dirname, 'build', common.buildType);
 const addonLink = path.join(common.tmpDir, 'addon');
 
 try {
-  fs.symlinkSync(addonPath, addonLink);
+  fs.symlinkSync(addonPath, addonLink, 'dir');
 } catch (err) {
   if (err.code !== 'EPERM') throw err;
   common.skip('module identity test (no privs for symlinks)');

test/es-module/test-esm-symlink.js

@@ -36,7 +36,7 @@ try {
   fs.symlinkSync(real, link_absolute_path);
   fs.symlinkSync(path.basename(real), link_relative_path);
   fs.symlinkSync(real, link_ignore_extension);
-  fs.symlinkSync(path.dirname(real), link_directory);
+  fs.symlinkSync(path.dirname(real), link_directory, 'dir');
 } catch (err) {
   if (err.code !== 'EPERM') throw err;
   common.skip('insufficient privileges for symlinks');

test/parallel/test-module-symlinked-peer-modules.js

@@ -42,7 +42,7 @@ fs.mkdirSync(moduleB);
 // Attempt to make the symlink. If this fails due to lack of sufficient
 // permissions, the test will bail out and be skipped.
 try {
-  fs.symlinkSync(moduleA, moduleA_link);
+  fs.symlinkSync(moduleA, moduleA_link, 'dir');
 } catch (err) {
   if (err.code !== 'EPERM') throw err;
   common.skip('insufficient privileges for symlinks');