Add a setup for each test.

app/tests/Controller/User/RegisterUserActionTest.php

@@ -43,6 +43,15 @@ class RegisterUserActionTest extends TestCase
                     ]);
     }
 
+
+    /**
+     * Set up the Application, the DI Container, and the Repository mock
+     */
+    protected function setUp(): void
+    {
+
+    }
+
     public function testSuccessfulRegistration(): void
     {
         $user = $this->getUser();