feat: update hatter test

__shuttle/hatter-test/src/lib.rs

@@ -1,13 +1,17 @@
 use axum::{routing::get, Router};
 use sync_wrapper::SyncWrapper;
 
+async fn root() -> &'static str {
+    "root"
+}
+
 async fn hello_world() -> &'static str {
     "Hello, world!"
 }
 
 #[shuttle_service::main]
 async fn axum() -> shuttle_service::ShuttleAxum {
-    let router = Router::new().route("/hello", get(hello_world));
+    let router = Router::new().route("/", get(root)).route("/hello", get(hello_world));
     let sync_wrapper = SyncWrapper::new(router);
 
     Ok(sync_wrapper)