nixpkgs/nixos/tests/postgresql/postgresql-jit.nix

{
  pkgs,
  makeTest,
  genTests,
}:

let
  inherit (pkgs) lib;

  makeTestFor =
    package:
    makeTest {
      name = "postgresql-jit-${package.name}";
      meta.maintainers = with lib.maintainers; [ ma27 ];

      nodes.machine =
        { pkgs, ... }:
        {
          services.postgresql = {
            inherit package;
            enable = true;
            enableJIT = true;
            initialScript = pkgs.writeText "init.sql" ''
              create table demo (id int);
              insert into demo (id) select generate_series(1, 5);
            '';
          };
        };

      testScript = ''
        machine.start()
        machine.wait_for_unit("postgresql.target")

        with subtest("JIT is enabled"):
            machine.succeed("sudo -u postgres psql <<<'show jit;' | grep 'on'")

        with subtest("Test JIT works fine"):
            output = machine.succeed(
                "cat ${pkgs.writeText "test.sql" ''
                  set jit_above_cost = 1;
                  EXPLAIN ANALYZE SELECT CONCAT('jit result = ', SUM(id)) FROM demo;
                  SELECT CONCAT('jit result = ', SUM(id)) from demo;
                ''} | sudo -u postgres psql"
            )
            assert "JIT:" in output
            assert "jit result = 15" in output

        machine.shutdown()
      '';
    };
in
genTests {
  inherit makeTestFor;
}