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22 changes: 22 additions & 0 deletions CONTRIBUTING.md
Original file line number Diff line number Diff line change
Expand Up @@ -83,6 +83,28 @@ When adding new interactive components:

# Contributing

## Local prerequisites

### API E2E tests

The API E2E suite spins up real Postgres and Redis containers via [Testcontainers](https://testcontainers.com/). You need:

- **Docker Desktop** (or any Docker-compatible daemon) running locally.
- Node 20+.

No `.env` file is needed — the global setup injects all ephemeral credentials at runtime.

```bash
cd backend
npm ci
npx prisma generate
npm run test:e2e
```

The first run pulls `postgres:16-alpine` and `redis:7-alpine` (~100 MB total). Subsequent runs use the local Docker cache and start in seconds.

> **Tip:** If a test hangs, check that Docker is running: `docker info`.

## Soroban ABI golden vectors

The file `backend/src/soroban/golden-vectors.json` records the exact ScVal
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