Refactor test files for improved readability and consistency

- Removed unnecessary blank lines and adjusted formatting in test files.
- Ensured consistent use of commas in function calls and assertions across various test cases.
- Updated import statements for better organization and clarity.
- Enhanced mock setups in tests for better isolation and reliability.
- Improved assertions to follow a consistent style for better readability.

tests/repositories/test_credit_transaction.py

@@ -42,7 +42,7 @@ class TestCreditTransactionRepository:
         """Create test credit transactions."""
         transactions = []
         user_id = test_user_id
-        
+
         # Create various types of transactions
         transaction_data = [
             {
@@ -105,9 +105,8 @@ class TestCreditTransactionRepository:
         ensure_plans: tuple[Any, ...],  # noqa: ARG002
     ) -> AsyncGenerator[CreditTransaction, None]:
         """Create a transaction for a different user."""
-        from app.models.plan import Plan
         from app.repositories.user import UserRepository
-        
+
         # Create another user
         user_repo = UserRepository(test_session)
         other_user_data = {
@@ -134,7 +133,7 @@ class TestCreditTransactionRepository:
         test_session.add(transaction)
         await test_session.commit()
         await test_session.refresh(transaction)
-        
+
         yield transaction
 
     @pytest.mark.asyncio
@@ -178,7 +177,7 @@ class TestCreditTransactionRepository:
         assert len(transactions) == 4
         # Should be ordered by created_at desc (newest first)
         assert all(t.user_id == test_user_id for t in transactions)
-        
+
         # Should not include other user's transaction
         other_user_ids = [t.user_id for t in transactions]
         assert other_user_transaction.user_id not in other_user_ids
@@ -193,13 +192,13 @@ class TestCreditTransactionRepository:
         """Test getting transactions by user ID with pagination."""
         # Get first 2 transactions
         first_page = await credit_transaction_repository.get_by_user_id(
-            test_user_id, limit=2, offset=0
+            test_user_id, limit=2, offset=0,
         )
         assert len(first_page) == 2
 
         # Get next 2 transactions
         second_page = await credit_transaction_repository.get_by_user_id(
-            test_user_id, limit=2, offset=2
+            test_user_id, limit=2, offset=2,
         )
         assert len(second_page) == 2
 
@@ -216,17 +215,17 @@ class TestCreditTransactionRepository:
     ) -> None:
         """Test getting transactions by action type."""
         vlc_transactions = await credit_transaction_repository.get_by_action_type(
-            "vlc_play_sound"
+            "vlc_play_sound",
         )
-        
+
         # Should return 2 VLC transactions (1 successful, 1 failed)
         assert len(vlc_transactions) >= 2
         assert all(t.action_type == "vlc_play_sound" for t in vlc_transactions)
 
         extraction_transactions = await credit_transaction_repository.get_by_action_type(
-            "audio_extraction"
+            "audio_extraction",
         )
-        
+
         # Should return 1 extraction transaction
         assert len(extraction_transactions) >= 1
         assert all(t.action_type == "audio_extraction" for t in extraction_transactions)
@@ -240,14 +239,14 @@ class TestCreditTransactionRepository:
         """Test getting transactions by action type with pagination."""
         # Test with limit
         transactions = await credit_transaction_repository.get_by_action_type(
-            "vlc_play_sound", limit=1
+            "vlc_play_sound", limit=1,
         )
         assert len(transactions) == 1
         assert transactions[0].action_type == "vlc_play_sound"
 
         # Test with offset
         transactions = await credit_transaction_repository.get_by_action_type(
-            "vlc_play_sound", limit=1, offset=1
+            "vlc_play_sound", limit=1, offset=1,
         )
         assert len(transactions) <= 1  # Might be 0 if only 1 VLC transaction in total
 
@@ -275,7 +274,7 @@ class TestCreditTransactionRepository:
     ) -> None:
         """Test getting successful transactions filtered by user."""
         successful_transactions = await credit_transaction_repository.get_successful_transactions(
-            user_id=test_user_id
+            user_id=test_user_id,
         )
 
         # Should only return successful transactions for test_user
@@ -294,14 +293,14 @@ class TestCreditTransactionRepository:
         """Test getting successful transactions with pagination."""
         # Get first 2 successful transactions
         first_page = await credit_transaction_repository.get_successful_transactions(
-            user_id=test_user_id, limit=2, offset=0
+            user_id=test_user_id, limit=2, offset=0,
         )
         assert len(first_page) == 2
         assert all(t.success is True for t in first_page)
 
         # Get next successful transaction
         second_page = await credit_transaction_repository.get_successful_transactions(
-            user_id=test_user_id, limit=2, offset=2
+            user_id=test_user_id, limit=2, offset=2,
         )
         assert len(second_page) == 1  # Should be 1 remaining
         assert all(t.success is True for t in second_page)
@@ -363,7 +362,7 @@ class TestCreditTransactionRepository:
         }
 
         updated_transaction = await credit_transaction_repository.update(
-            transaction, update_data
+            transaction, update_data,
         )
 
         assert updated_transaction.id == transaction.id
@@ -413,7 +412,7 @@ class TestCreditTransactionRepository:
     ) -> None:
         """Test that transactions are ordered by created_at desc."""
         transactions = await credit_transaction_repository.get_by_user_id(test_user_id)
-        
+
         # Should be ordered by created_at desc (newest first)
         for i in range(len(transactions) - 1):
-            assert transactions[i].created_at >= transactions[i + 1].created_at
+            assert transactions[i].created_at >= transactions[i + 1].created_at