Always injects file name into the class nodes, resolves #8

Author: lisachenko

src/ReflectionEngine.php

@@ -117,6 +117,8 @@ public static function parseClass($fullClassName)
 
         foreach ($namespaceNodes as $namespaceLevelNode) {
             if ($namespaceLevelNode instanceof ClassLike && $namespaceLevelNode->name == $className) {
+                $namespaceLevelNode->setAttribute('fileName', $classFileName);
+
                 return $namespaceLevelNode;
             }
         }