}
		}
		if buf.Len() != int(handlerN) {
			t.Errorf("expected echo of size %d; got %d", handlerN, buf.Len())
		}

		return nil
	})
}

func TestEarlyHints(t *testing.T) {
	ht := newHandlerTest(HandlerFunc(func(w ResponseWriter, r *Request) {
		h := w.Header()
		h.Add("Link", "</style.css>; rel=preload; as=style")
		h.Add("Link", "</script.js>; rel=preload; as=script")