these 6 derivations will be built:
  /nix/store/dqg6bi7x5i9nzzk09zy9paia0m68s8lw-nixos-system-bob-test.drv
  /nix/store/2dqlsjw3vagzqa1324jcrpd5lras388g-closure-info.drv
  /nix/store/qyyqm3cak4ns94bwy0ns4cpp61nbz3bh-nixos-system-alice-test.drv
  /nix/store/nfbwrcl0kkpizqk5i5jkdfnayprqqyc5-closure-info.drv
  /nix/store/v7jag03gibn00pvzchg2zh142b5fjjky-nixos-test-driver-ncps.drv
  /nix/store/iv1v0zhhn6q0g7zsmlm3g5m7smixliqg-container-test-run-ncps.drv