test: fs.watch filename check for Windows & AIX

Fixes: nodejs#13108

Author: Chris Young

doc/api/fs.md

@@ -2406,7 +2406,7 @@ this improves the usability of file watching. This is expected behavior.
 <!--type=misc-->
 
 Providing `filename` argument in the callback is only supported on Linux, 
-macOS, and Windows.  Even on supported platforms, `filename` is not always 
+macOS, Windows, and AIX.  Even on supported platforms, `filename` is not always 
 guaranteed to be provided. Therefore, don't assume that `filename` argument is 
 always provided in the callback, and have some fallback logic if it is null.
 

test/parallel/test-fs-watchfile.js

@@ -64,24 +64,20 @@ fs.watchFile(enoentFile, {interval: 0}, common.mustCall(function(curr, prev) {
   }
 }, 2));
 
-// Watch events should callback with a filename
-if (common.isLinux || common.isOSX) {
+// Watch events should callback with a filename on supported systems
+if (common.isLinux || common.isOSX || common.isWindows || common.isAix) {
   const dir = common.tmpDir + '/watch';
 
   fs.mkdir(dir, common.mustCall(function(err) {
-    assert(!err);
+    if (err) assert.fail(err);
 
     fs.watch(dir, common.mustCall(function(eventType, filename) {
       this._handle.close();
-      common.refreshTmpDir();
       assert.strictEqual(filename, 'foo.txt');
     }));
 
-    fs.writeFile(`${dir}/foo.txt`, 'foo', common.mustCall((err) => {
-      if (err) {
-        common.refreshTmpDir();
-        assert(!err);
-      }
+    fs.writeFile(`${dir}/foo.txt`, 'foo', common.mustCall(function(err) {
+      if (err) assert.fail(err);
     }));
   }));
 }