diff --git a/composer.json b/composer.json
index 44d5479..12f8b68 100644
--- a/composer.json
+++ b/composer.json
@@ -27,6 +27,7 @@
     },
     "autoload-dev": {
         "classmap": [
+            "tests/Stubs/",
             "tests/TestCase.php"
         ],
         "files": [