these 2 derivations will be built:
  /nix/store/xsbsxa0p121i9ys0b3ddf67fgsb6rnb5-nixos-test-driver-pgtap.drv
  /nix/store/pzf1391yi0fgb3kbczfxzakh0kqwbdss-vm-test-run-pgtap.drv