Now, both the unit and functional tests relating to derivation options
are tested both ways -- with input addressing and content-addressing
derivations.
This tests the Nix language side of things.
We are purposely skipping most of `common.sh` because it is overkill for
this test: we don't want to have an "overfit" test environment.
Co-Authored-By: John Ericson <John.Ericson@Obsidian.Systems>
