diff --git a/server/tests/test_dedicated_server_config.py b/server/tests/test_dedicated_server_config.py
new file mode 100644
index 0000000..5ba55a4
--- /dev/null
+++ b/server/tests/test_dedicated_server_config.py
@@ -0,0 +1,27 @@
+from pathlib import Path
+
+from config import Config
+from dedicated_server import build_service_config
+
+
+def test_dedicated_server_preserves_gns_rollout_fields(tmp_path: Path):
+    config_path = tmp_path / "commonwealth-server.json"
+    config = Config(
+        host="127.0.0.1",
+        port=7777,
+        server_name="Test",
+        server_description="GNS",
+        max_players=12,
+        log_verbosity="debug",
+        admin_port=7779,
+        enable_gns_transport=True,
+        gns_bridge_path="/opt/commonwealth/libcommonwealth_online_gns_bridge.so",
+    )
+
+    service_config = build_service_config(config, config_path)
+    assert service_config.host == "127.0.0.1"
+    assert service_config.port == 7777
+    assert service_config.max_players == 12
+    assert service_config.enable_gns_transport is True
+    assert service_config.gns_bridge_path == "/opt/commonwealth/libcommonwealth_online_gns_bridge.so"
+    assert service_config.bans_path == str(tmp_path / "bans.json")