not used to plugin testing - trying to get working but fixtures not working yet

composer.json

@@ -5,6 +5,7 @@
     "license": "AGPL-3.0-or-later",
     "require": {
         "php": ">=8.1",
+        "dereuromark/cakephp-tools": "^3.9",
         "cakephp/cakephp": "^5.0.1"
     },
     "require-dev": {
@@ -18,7 +19,8 @@
     "autoload-dev": {
         "psr-4": {
             "CakeProducts\\Test\\": "tests/",
-            "Cake\\Test\\": "vendor/cakephp/cakephp/tests/"
+            "Cake\\Test\\": "vendor/cakephp/cakephp/tests/",
+            "TestApp\\": "tests/test_app/src/"
         }
     }
 }