Unit tests (PlatformIO Unit Testing / Unity) go here.

Planned first test: EL512Panel::encodeRow() - check that HS is high for exactly
256 clocks per visible row, VS appears only on the last blanking line, and that
even/odd columns land on VID/TVID.

Run with:  pio test -e esp32dev

More info: https://docs.platformio.org/en/latest/advanced/unit-testing/index.html