nixos/locate: Add a test

nixos/tests/all-tests.nix

@@ -190,6 +190,7 @@ in
   lidarr = handleTest ./lidarr.nix {};
   lightdm = handleTest ./lightdm.nix {};
   limesurvey = handleTest ./limesurvey.nix {};
+  locate = handleTest ./locate.nix {};
   login = handleTest ./login.nix {};
   loki = handleTest ./loki.nix {};
   lxd = handleTest ./lxd.nix {};

nixos/tests/locate.nix

@@ -0,0 +1,21 @@
+import ./make-test-python.nix ({ lib, pkgs, ... }:
+  let inherit (import ./ssh-keys.nix pkgs) snakeOilPrivateKey snakeOilPublicKey;
+  in {
+    name = "locate";
+    meta.maintainers = with pkgs.stdenv.lib.maintainers; [ chkno ];
+
+    nodes = rec {
+      a = {
+        services.locate = {
+          enable = true;
+          interval = "*:*:0/5";
+        };
+      };
+    };
+
+    testScript = ''
+      a.succeed("touch /file-on-a-machine-1")
+      a.wait_for_file("/var/cache/locatedb")
+      a.wait_until_succeeds("locate file-on-a-machine-1")
+    '';
+  })