Add test for bad request

src/test/resources/feature/auth.feature

@@ -18,6 +18,20 @@ Feature: Auth routes
     eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzUxMiJ9.
     """
 
+  Scenario: The route for create citizen must response a 200 and return object
+    When I send a POST request to "/register" with body:
+    """
+    {
+      "name": {"first_name":"George2", "last_name":"MICHEL2"},
+      "birthday": "2001-01-01",
+      "user":{
+        "username": "",
+        "plain_password": ""
+      }
+    }
+    """
+    Then the response status code should be 400
+
   Scenario: The route for create citizen must response a 200 and return object
     When I send a POST request to "/login" with body:
     """