nixpkgs/nixos/tests/initdb.nix

import ./make-test-python.nix ({ pkgs, latestKernel ? false, ... }: {
  name = "pg-initdb";

  machine = {...}:
    {
      documentation.enable = false;
      services.postgresql.enable = true;
      services.postgresql.package = pkgs.postgresql_9_6;
      environment.pathsToLink = [
        "/share/postgresql"
      ];
    };

  testScript = ''
    machine.start()
    machine.succeed("sudo -u postgres initdb -D /tmp/testpostgres2")
    machine.shutdown()
  '';
})