Refer to https://github.com/ethereum/execution-spec-tests for the recent testing effords.
You could still use retesteth to debug legacy tests. Retesteth last supported fork for test generation is Cancun Retesteth supports .py test filling using execution-spec-tests release around Prague (Jan 2025).
A test generation tool for the test fillers https://github.com/ethereum/tests/tree/develop/src
Using state transition tool t8n
More t8n spec docs: https://github.com/ethereum/go-ethereum/tree/master/cmd/evm
Execution stats: http://retesteth.ethdevops.io/
Web interface: http://retesteth.ethdevops.io/web/
Telegram: @wdimitry