Tests from the upstream tests are in this directory. AFAICT, the RISCOF tests are (were?) originally derived from this repository and are more comprehensive. However, this repo looks easier to start with.
Make sure doit is installed via pdm install -G dev. You must provide your
own copy of riscv64-unknown-elf-gcc. Then, run using pdm test or
pdm test-quick.
See Testing Prerequisites and Sim And Upstream docs for more information.