diff --git a/codex-rs/core/src/guardian/review_session.rs b/codex-rs/core/src/guardian/review_session.rs
index 221a7cf5fd..de9ca4c2ff 100644
--- a/codex-rs/core/src/guardian/review_session.rs
+++ b/codex-rs/core/src/guardian/review_session.rs
@@ -518,6 +518,36 @@ impl GuardianReviewSessionManager {
         }
     }
 
+    #[cfg(test)]
+    pub(crate) async fn cache_for_test(&self, codex: Codex) {
+        let reuse_key = GuardianReviewSessionReuseKey::from_spawn_config(
+            codex.session.get_config().await.as_ref(),
+        );
+        self.state.lock().await.trunk = Some(Arc::new(GuardianReviewSession {
+            reuse_key,
+            codex,
+            cancel_token: CancellationToken::new(),
+            review_lock: Mutex::new(()),
+            last_committed_rollout_items: Mutex::new(None),
+        }));
+    }
+
+    #[cfg(test)]
+    pub(crate) async fn register_fork_for_test(&self, codex: Codex) {
+        let reuse_key = GuardianReviewSessionReuseKey::from_spawn_config(
+            codex.session.get_config().await.as_ref(),
+        );
+        self.fork_pool
+            .register(Arc::new(GuardianReviewSession {
+                reuse_key,
+                codex,
+                cancel_token: CancellationToken::new(),
+                review_lock: Mutex::new(()),
+                last_committed_rollout_items: Mutex::new(None),
+            }))
+            .await;
+    }
+
     async fn choose_review_lane<'a>(
         &self,
         trunk: &'a Arc<GuardianReviewSession>,