Enhance test fixtures and user registration logic to ensure plan existence and correct role assignment

tests/services/test_auth_service.py

@@ -22,7 +22,10 @@ class TestAuthService:
 
     @pytest.mark.asyncio
     async def test_register_success(
-        self, auth_service: AuthService, test_plan: Plan, test_user_data: dict[str, str]
+        self,
+        auth_service: AuthService,
+        ensure_plans: tuple[Plan, Plan],
+        test_user_data: dict[str, str],
     ) -> None:
         """Test successful user registration."""
         request = UserRegisterRequest(**test_user_data)
@@ -32,10 +35,12 @@ class TestAuthService:
         # Check user data
         assert response.user.email == test_user_data["email"]
         assert response.user.name == test_user_data["name"]
-        assert response.user.role == "user"
+        assert response.user.role == "admin"  # First user gets admin role
         assert response.user.is_active is True
-        assert response.user.credits == test_plan.credits
-        assert response.user.plan["code"] == test_plan.code
+        # First user gets pro plan
+        free_plan, pro_plan = ensure_plans
+        assert response.user.credits == pro_plan.credits
+        assert response.user.plan["code"] == pro_plan.code
 
         # Check token
         assert response.token.access_token is not None
@@ -213,7 +218,7 @@ class TestAuthService:
         # Ensure plan relationship is loaded
         await test_session.refresh(test_user, ["plan"])
 
-        user_response = await auth_service._create_user_response(test_user)
+        user_response = await auth_service.create_user_response(test_user)
 
         assert user_response.id == test_user.id
         assert user_response.email == test_user.email