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mtg-online-drafter/docs/development/devlog/2025-12-15-002500_deck_tester_feature.md

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# Deck Tester Feature Implementation
## Objective
Create a way to add a cards list to generate a deck and directly enter the game ui to test the imported deck, using the same exact game and battlefield of the draft.
## Implementation Details
### Frontend
1. **DeckTester Component (`src/client/src/modules/tester/DeckTester.tsx`)**:
- Created a new component that allows users to input a deck list (text area or file upload).
- Reused `CardParserService` and `ScryfallService` to parse the list and fetch card data.
- Implemented image caching logic (sending to `/api/cards/cache`).
- Connects to socket and emits `start_solo_test`.
- Upon success, switches view to `GameRoom` with the received `room` and `game` state.
2. **App Integration (`src/client/src/App.tsx`)**:
- Added a new "Deck Tester" tab to the main navigation.
- Uses the `Play` icon from lucide-react.
3. **GameRoom Enhancement (`src/client/src/modules/lobby/GameRoom.tsx`)**:
- Added `initialGameState` prop to allow initializing the `GameView` immediately without waiting for a socket update (handling potential race conditions or state sync delays).
### Backend
1. **Socket Event (`src/server/index.ts`)**:
- Added `start_solo_test` event handler.
- Creates a room with status `playing`.
- Initializes a game instance.
- Adds cards from the provided deck list to the game (library zone).
- Emits `room_update` and `game_update` to the client.
## Outcome
The user can now navigate to "Deck Tester", paste a deck list, and immediately enter the 3D Game View to test interactions on the battlefield. This reuses the entire Draft Game infrastructure, ensuring consistency.