diff --git a/tarpc/src/server/in_flight_requests.rs b/tarpc/src/server/in_flight_requests.rs
index 67817e2..581eac3 100644
--- a/tarpc/src/server/in_flight_requests.rs
+++ b/tarpc/src/server/in_flight_requests.rs
@@ -185,11 +185,26 @@ mod tests {
     async fn remove_request_doesnt_abort() {
         let mut in_flight_requests = InFlightRequests::default();
         let abort_registration = in_flight_requests
-            .start_request(0, SystemTime::now(), Span::current())
+            .start_request(
+                0,
+                SystemTime::now() + std::time::Duration::from_secs(10),
+                Span::current(),
+            )
             .unwrap();
         let mut abortable_future = Box::new(Abortable::new(pending::<()>(), abort_registration));
 
+        // Precondition: Pending expiration
+        assert_matches!(
+            in_flight_requests.poll_expired(&mut noop_context()),
+            Poll::Pending
+        );
+
         assert_matches!(in_flight_requests.remove_request(0), Some(_));
+        // Postcondition: No pending expirations
+        assert_matches!(
+            in_flight_requests.poll_expired(&mut noop_context()),
+            Poll::Ready(None)
+        );
         assert_matches!(
             abortable_future.poll_unpin(&mut noop_context()),
             Poll::Pending