Configure Neotest adapters

[matteocavestri]

I'm working on a nixvim configuration aiming to be compatible with LSP, debugging, diagnostics, and testing for the largest number of languages. The flake is designed to allow either the full version or a specific version for the chosen language.
It's still a work in progress and I'm having issues configuring neotest, which I want to start setting up for Go, Rust, Java, and Python. If someone has managed to configure neotest adapters, could you help me out?

My repo is: https://github.com/matteocavestri/nevica
It's a work in progress and extremely messy and undocumented, but in its final form, it should provide comprehensive support for many languages with the ability to add complete support for new ones with a single file under ./config/languages/. For now, it's only available as a package, but I want to also make devShells available in the flake to have ready-to-use development environments anywhere. Thank you very much for your help.