Auth service tests update

app/exceptions/auth.py

@@ -3,8 +3,8 @@
 Authentication and authorization specific exceptions.
 """
 
-from typing import Any, Dict, Optional
-from .base import AuthenticationException, AuthorizationException
+from typing import Optional
+from .base import AuthenticationException, AuthorizationException, ConflictException
 
 
 class InvalidCredentialsException(AuthenticationException):
@@ -76,7 +76,7 @@ class AdminRequiredException(AuthorizationException):
         )
 
 
-class UserAlreadyExistsException(AuthenticationException):
+class UserAlreadyExistsException(ConflictException):
     """Raised when trying to register with existing username/email."""
 
     def __init__(