Refactor code structure for improved readability and maintainability

tests/repositories/test_credit_transaction.py

@@ -32,7 +32,7 @@ class TestCreditTransactionRepository:
     async def credit_transaction_repository(
         self,
         test_session: AsyncSession,
-    ) -> AsyncGenerator[CreditTransactionRepository, None]:
+    ) -> AsyncGenerator[CreditTransactionRepository]:
         """Create a credit transaction repository instance."""
         yield CreditTransactionRepository(test_session)
 
@@ -50,7 +50,7 @@ class TestCreditTransactionRepository:
         self,
         test_session: AsyncSession,
         test_user_id: int,
-    ) -> AsyncGenerator[list[CreditTransaction], None]:
+    ) -> AsyncGenerator[list[CreditTransaction]]:
         """Create test credit transactions."""
         transactions = []
         user_id = test_user_id
@@ -115,7 +115,7 @@ class TestCreditTransactionRepository:
         self,
         test_session: AsyncSession,
         ensure_plans: tuple[Any, ...],
-    ) -> AsyncGenerator[CreditTransaction, None]:
+    ) -> AsyncGenerator[CreditTransaction]:
         """Create a transaction for a different user."""
         # Create another user
         user_repo = UserRepository(test_session)