# Testing

## Native Tests (host machine)

Run algorithm tests that don't require hardware:

```bash
pio test -e native
```

Tests:

- `test_photo_queue.cpp` — queue cycling, favorites weighting
- `test_image_pipeline.cpp` — nearest color, dithering correctness

## On-Device Testing

Flash and monitor:

```bash
pio run -e m5stack-papercolor -t upload && pio device monitor
```

### Verification Checklist

- [ ] Device boots and prints version to serial
- [ ] AP mode activates on first boot
- [ ] Captive portal serves setup page at 192.168.4.1
- [ ] WiFi credentials save and device reboots to station mode
- [ ] mDNS resolves at papercolor.local
- [ ] Web UI dashboard shows battery/WiFi/uptime
- [ ] Albums page lists Immich albums
- [ ] Album selection persists across reboots
- [ ] Photos download and display correctly
- [ ] Portrait photos pair side-by-side
- [ ] Slideshow advances at configured interval
- [ ] BTN_UP: next photo (LED flashes white)
- [ ] BTN_TOP: random photo (LED flashes white)
- [ ] BTN_DOWN: pause/play toggle
- [ ] BTN_TOP+BTN_DOWN 3s: deep sleep
- [ ] BTN_UP 5s: factory reset
- [ ] Battery LED: orange at 25%, red at 10%
- [ ] OTA upload succeeds via web UI
- [ ] Device recovers from WiFi disconnect (reconnect on next cycle)