## Test Plan for CUDA and Android Support

### Unit Tests

#### Test Case 1: NVIDIA GPU Detection
- **Input:** System with NVIDIA GPU and pynvml installed
- **Expected Output:** GPUInfo with correct name, VRAM, and is_nvidia=True
- **Location:** src/hardware/detector.py:detect_nvidia_gpu()

#### Test Case 2: GPU Layer Configuration for CUDA
- **Input:** HardwareProfile with NVIDIA GPU (4GB VRAM)
- **Expected Output:** n_gpu_layers=-1 (all layers), proper CUDA configuration
- **Location:** src/backends/__init__.py:create_backend()

#### Test Case 3: Android Platform Detection
- **Input:** platform.system() returns 'Linux', Termux environment detected
- **Expected Output:** is_android=True, proper Android path handling
- **Location:** src/hardware/detector.py:detect_android()

#### Test Case 4: PeerInfo with Timeout
- **Input:** PeerInfo with custom timeout
- **Expected Output:** FederationClient respects peer timeout
- **Location:** src/network/discovery.py:PeerInfo

### Integration Tests

#### End-to-End Flow 1: CUDA Backend Creation
1. Detect hardware with NVIDIA GPU
2. Create backend via factory
3. Verify n_gpu_layers=-1 set
4. Load test model
5. Expected: Successful GPU offload

#### End-to-End Flow 2: Android Device Join Federation
1. Start discovery on Android (Termux)
2. Advertise Android hardware
3. Join federation from macOS peer
4. Send vote request
5. Expected: Android responds successfully

#### End-to-End Flow 3: Federation with Per-Peer Timeout
1. Add peer with 30s timeout
2. Add peer with 60s timeout
3. Request votes from both
4. Expected: Each peer uses its own timeout

### Manual Verification

#### Command to Run:
```bash
python -m pytest tests/ -v -k "cuda or android or federation"
```

#### Expected Output:
- All tests pass
- No ImportError for pynvml
- GPU layer detection works on CUDA machines
- Android detection passes on Termux

#### Platform Testing:
1. **macOS (Apple Silicon):** MLX backend loads
2. **Linux (NVIDIA):** CUDA backend auto-detects
3. **Android (Termux):** CPU-only mode, proper paths