nixosTests.promscale: add tests for promscale_extension

nixos/tests/all-tests.nix

@@ -712,6 +712,7 @@ in {
   tiddlywiki = handleTest ./tiddlywiki.nix {};
   tigervnc = handleTest ./tigervnc.nix {};
   timescaledb = handleTest ./timescaledb.nix {};
+  promscale = handleTest ./promscale.nix {};
   timezone = handleTest ./timezone.nix {};
   tinc = handleTest ./tinc {};
   tinydns = handleTest ./tinydns.nix {};

nixos/tests/promscale.nix

@@ -0,0 +1,60 @@
+# mostly copied from ./timescaledb.nix which was copied from ./postgresql.nix
+# as it seemed unapproriate to test additional extensions for postgresql there.
+
+{ system ? builtins.currentSystem
+, config ? { }
+, pkgs ? import ../.. { inherit system config; }
+}:
+
+with import ../lib/testing-python.nix { inherit system pkgs; };
+with pkgs.lib;
+
+let
+  postgresql-versions = import ../../pkgs/servers/sql/postgresql pkgs;
+  test-sql = pkgs.writeText "postgresql-test" ''
+    CREATE USER promscale SUPERUSER PASSWORD 'promscale';
+    CREATE DATABASE promscale OWNER promscale;
+  '';
+
+  make-postgresql-test = postgresql-name: postgresql-package: makeTest {
+    name = postgresql-name;
+    meta = with pkgs.lib.maintainers; {
+      maintainers = [ anpin ];
+    };
+
+    nodes.machine = { config, pkgs, ... }:
+      {
+        services.postgresql = {
+          enable = true;
+          package = postgresql-package;
+          extraPlugins = with postgresql-package.pkgs; [
+            timescaledb
+            promscale_extension
+          ];
+          settings = { shared_preload_libraries = "timescaledb, promscale"; };
+        };
+        environment.systemPackages = with pkgs; [ promscale ];
+      };
+
+    testScript = ''
+      machine.start()
+      machine.wait_for_unit("postgresql")
+      with subtest("Postgresql with extensions timescaledb and promscale is available just after unit start"):
+          print(machine.succeed("sudo -u postgres psql -f ${test-sql}"))
+          machine.succeed("sudo -u postgres psql promscale -c 'SHOW shared_preload_libraries;' | grep promscale")
+          machine.succeed(
+            "promscale --db.name promscale --db.password promscale --db.user promscale --db.ssl-mode allow --startup.install-extensions --startup.only"
+          )
+      machine.succeed("sudo -u postgres psql promscale -c 'SELECT ps_trace.get_trace_retention_period();' | grep '(1 row)'")
+      machine.shutdown()
+    '';
+  };
+  #version 15 is not supported yet
+  applicablePostgresqlVersions = filterAttrs (_: value: versionAtLeast value.version "12" && !(versionAtLeast value.version "15")) postgresql-versions;
+in
+mapAttrs'
+  (name: package: {
+    inherit name;
+    value = make-postgresql-test name package;
+  })
+  applicablePostgresqlVersions