let ext = warp::ext::get::<Ext1>();

let extracted = warp::test::request()

.extension(Ext1(55))

.filter(&ext)

.await

.unwrap();

assert_eq!(extracted, Ext1(55));

let ext = warp::ext::get().map(|e: Ext1| e.0.to_string());

let res = warp::test::request().reply(&ext).await;

assert_eq!(res.status(), 500);

assert_eq!(res.body(), "Missing request extension");