borg is able to process stdin during backups when backing up the special path -,
which can be very useful for backing up things that can be streamed (eg database
dumps, zfs snapshots).
We had problems to get borg's own test suite running.
This test is intended to perform a quick smoke test to see whether we
have missed not any important dependency necessary to create backups
with borg.
tested with:
$ nix-build nixos/release.nix -A tests.borgbackup.x86_64-linux
