fix(tests): Correct path joining in HubTest to use DIRECTORY_SEPARATOR for consistency

Author: CodeWithKyrian

tests/Utils/HubTest.php

@@ -31,7 +31,7 @@
 });
 
 it('joins paths correctly with trailing slash', function () {
-    $result = joinPaths('path', 'to', 'file/');
+    $result = joinPaths('path', 'to', 'file'.DIRECTORY_SEPARATOR);
     $expected = 'path'.DIRECTORY_SEPARATOR.'to'.DIRECTORY_SEPARATOR.'file';
     expect($result)->toBe($expected);
 });