diff --git a/crates/openshell-sandbox-backend/src/audit.rs b/crates/openshell-sandbox-backend/src/audit.rs
index 59f6ba1dc..1751ce5ab 100644
--- a/crates/openshell-sandbox-backend/src/audit.rs
+++ b/crates/openshell-sandbox-backend/src/audit.rs
@@ -49,7 +49,8 @@ mod tests {
                 },
                 "landlock_abi": 3, "landlock_allow_deny": true,
                 "udp_dns_round_trip": true, "tcp_dns_round_trip": true,
-                "tcp_allow_round_trip": true, "tcp_deny_round_trip": true
+                "tcp_allow_round_trip": true, "tcp_deny_round_trip": true,
+                "socket_loopback_confinement": true
         });
         let properties = LinuxBoundaryAuditValidator.validate(&evidence).unwrap();
         let audit: crate::boundary_protocol::NativeLinuxSandboxAuditEvidence =
diff --git a/crates/openshell-supervisor/src/backend_setup/tests.rs b/crates/openshell-supervisor/src/backend_setup/tests.rs
index c9b464146..16359e59b 100644
--- a/crates/openshell-supervisor/src/backend_setup/tests.rs
+++ b/crates/openshell-supervisor/src/backend_setup/tests.rs
@@ -357,6 +357,18 @@ impl NetworkMediationSource for TestIo {
 
 #[tonic::async_trait]
 impl BoundaryProcess for TestIo {
+    async fn attach(
+        &self,
+    ) -> std::result::Result<openshell_isolation_interface::contract::ProcessAttachment, BackendError>
+    {
+        Ok(openshell_isolation_interface::contract::ProcessAttachment {
+            stdin: Box::new(tokio::io::sink()),
+            stdout: Box::new(tokio::io::empty()),
+            stderr: Some(Box::new(tokio::io::empty())),
+            terminal: None,
+        })
+    }
+
     async fn wait(&self) -> std::result::Result<BoundaryExitStatus, BackendError> {
         Ok(BoundaryExitStatus::Exited(0))
     }