test: strengthen durable behavior coverage after review

crates/irtt-server/tests/runtime.rs

@@ -145,3 +145,13 @@ async fn exercise_bound_server(mut server: Server) {
 fn unthrottled() -> ServerConfig {
     ServerConfig::default().with_min_send_interval(Duration::ZERO)
 }
+
+#[cfg(not(any(target_os = "linux", target_os = "macos", target_os = "freebsd")))]
+#[tokio::test(flavor = "current_thread")]
+async fn wildcard_construction_is_refused_without_reply_source_selection() {
+    let addr = "0.0.0.0:0".parse().unwrap();
+    assert!(matches!(
+        Server::bind(addr, unthrottled()).await,
+        Err(ServerRuntimeError::WildcardSourceSelectionUnsupported { .. })
+    ));
+}