Tests aren't run in the derivation for nix-eval-jobs

[lf-]

It would be good if nix-eval-jobs meson ran tests, which would in turn make the derivation run the tests

[Mic92]

Those test needs a writeable store. It requires a bit of effort to make this work inside nix build i.e. using a different store.

[lf-]

oh, reminds me of the NixOS tests we reviewed recently on an internal project. they use .inputDerivation and then some extra store paths mechanism we forget, which pulls the dependencies for the test into the store making it offline compatible. but definitely annoying to need such a methodology.

does n-e-j test need merely a writable store (in which case nix copy and setting --store for the tests would suffice) or does it need to execute builds on it (in which case you probably need the NixOS test described above)?