diff --git a/composer.json b/composer.json
index 09a1f62..9b78e74 100644
--- a/composer.json
+++ b/composer.json
@@ -29,6 +29,7 @@
   },
   "autoload-dev": {
     "psr-4": {
+      "Rx\\Thruway\\Tests\\": "tests/",
       "Rx\\": "vendor/reactivex/rxphp/test/Rx"
     },
     "files": [