fix(interop_test): return error if demo_node_cpp is missing (#27)

Author: YuanYuYuan

ros-z-tests/tests/common/mod.rs

@@ -92,3 +92,15 @@ pub fn check_rmw_zenoh_available() -> bool {
         .map(|status| status.success())
         .unwrap_or(false)
 }
+
+/// Check if demo_nodes_cpp package is available
+#[allow(dead_code)]
+pub fn check_demo_nodes_cpp_available() -> bool {
+    Command::new("ros2")
+        .args(["pkg", "prefix", "demo_nodes_cpp"])
+        .stdout(Stdio::null())
+        .stderr(Stdio::null())
+        .status()
+        .map(|status| status.success())
+        .unwrap_or(false)
+}

ros-z-tests/tests/service_interop.rs

@@ -150,6 +150,14 @@ fn test_ros2_server_ros_z_client() {
         panic!("ros2 CLI not available");
     }
 
+    if !check_demo_nodes_cpp_available() {
+        panic!(
+            "demo_nodes_cpp package not found!\n\
+             Please install it with: apt install ros-$ROS_DISTRO-demo-nodes-cpp\n\
+             Or ensure ROS environment is sourced: source /opt/ros/$ROS_DISTRO/setup.bash"
+        );
+    }
+
     ensure_zenohd_running();
 
     println!("\n=== Test: ROS2 server <-> ros-z client ===");