Nixpkgs switched pkgs.formats.yaml to remarshal v2. Generated files now
start with a %YAML 1.1 directive and a --- document start, and multiline
strings use double-quoted escapes.
Only files written through yamlFormat.generate change. Modules that
declare the YAML type but write the file with builtins.toJSON keep their
current output.
Before 19.03, programs.beets.enable implicitly followed whether
programs.beets.settings was non-empty. That compatibility branch was
still active for older state versions, but it was silent.
Route the default through the shared state-version helper so legacy
users get a consistent deprecation warning before the implicit
enablement is cleaned up. Add focused tests for the legacy and current
default branches alongside the existing beets coverage.
Signed-off-by: Austin Horstman <khaneliman12@gmail.com>
Instead of having to manually stub packages that should not be
downloaded we instead automatically stub all packages (except a small
list of whitelisted ones). Tests can re-introduce the real package by
using the `realPkgs` module argument.
