diff --git a/tests/routes.rs b/tests/routes.rs
index 9e38fe2f..0b4d8098 100644
--- a/tests/routes.rs
+++ b/tests/routes.rs
@@ -4,6 +4,7 @@ use std::sync::{
 };
 
 use bytes::BytesMut;
+use rstest::rstest;
 use wireframe::{
     Serializer,
     app::WireframeApp,
@@ -24,6 +25,7 @@ struct TestEnvelope {
 #[derive(bincode::Encode, bincode::BorrowDecode, PartialEq, Debug)]
 struct Echo(u8);
 
+#[rstest]
 #[tokio::test]
 async fn handler_receives_message_and_echoes_response() {
     let called = Arc::new(AtomicUsize::new(0));
diff --git a/tests/util.rs b/tests/util.rs
index 16371c41..cd136a84 100644
--- a/tests/util.rs
+++ b/tests/util.rs
@@ -1,5 +1,6 @@
+use rstest::fixture;
 use tokio::io::{self, AsyncReadExt, AsyncWriteExt, duplex};
-use wireframe::app::WireframeApp;
+use wireframe::{app::WireframeApp, frame::LengthPrefixedProcessor};
 
 /// Feed a single frame into `app` and collect the response bytes.
 ///
@@ -13,6 +14,13 @@ use wireframe::app::WireframeApp;
 /// Optional duplex buffer capacity for `run_app_with_frame`.
 const DEFAULT_CAPACITY: usize = 4096;
 
+/// Create a default length-prefixed frame processor for tests.
+#[fixture]
+#[rustfmt::skip]
+pub fn processor() -> LengthPrefixedProcessor {
+    LengthPrefixedProcessor::default()
+}
+
 /// Run `app` with a single input `frame` using the default buffer capacity.
 ///
 /// # Errors