minecraft-server: Add test

nixos/tests/all-tests.nix

@@ -209,6 +209,7 @@ in
   memcached = handleTest ./memcached.nix {};
   metabase = handleTest ./metabase.nix {};
   minecraft = handleTest ./minecraft.nix {};
+  minecraft-server = handleTest ./minecraft-server.nix {};
   miniflux = handleTest ./miniflux.nix {};
   minio = handleTest ./minio.nix {};
   minidlna = handleTest ./minidlna.nix {};

nixos/tests/minecraft-server.nix

@@ -0,0 +1,37 @@
+let
+  seed = "2151901553968352745";
+  rcon-pass = "foobar";
+  rcon-port = 43000;
+in import ./make-test-python.nix ({ pkgs, ... }: {
+  name = "minecraft-server";
+  meta = with pkgs.stdenv.lib.maintainers; { maintainers = [ nequissimus ]; };
+
+  nodes.server = { ... }: {
+    environment.systemPackages = [ pkgs.mcrcon ];
+
+    nixpkgs.config.allowUnfree = true;
+
+    services.minecraft-server = {
+      declarative = true;
+      enable = true;
+      eula = true;
+      serverProperties = {
+        enable-rcon = true;
+        level-seed = seed;
+        online-mode = false;
+        "rcon.password" = rcon-pass;
+        "rcon.port" = rcon-port;
+      };
+    };
+
+    virtualisation.memorySize = 2048;
+  };
+
+  testScript = ''
+    server.wait_for_unit("minecraft-server")
+    server.wait_for_open_port(${toString rcon-port})
+    assert "${seed}" in server.succeed(
+        "mcrcon -H localhost -P ${toString rcon-port} -p '${rcon-pass}' -c 'seed'"
+    )
+  '';
+})