diff --git a/tests/unit/executor-codex.test.ts b/tests/unit/executor-codex.test.ts
index 05c67da79b..e27df7ba2f 100644
--- a/tests/unit/executor-codex.test.ts
+++ b/tests/unit/executor-codex.test.ts
@@ -274,7 +274,7 @@ test("CodexExecutor.transformRequest preserves store-enabled responses state whe
 
   assert.equal(result._omnirouteResponsesStore, undefined);
   assert.equal(result.store, true);
-  assert.equal(result.previous_response_id, undefined);
+  assert.equal(result.previous_response_id, "resp_prev_123");
 });
 
 test("CodexExecutor.transformRequest applies per-connection reasoning and service tier defaults", () => {
diff --git a/tests/unit/responses-handler.test.ts b/tests/unit/responses-handler.test.ts
index 9f5022dde0..60b0b07b77 100644
--- a/tests/unit/responses-handler.test.ts
+++ b/tests/unit/responses-handler.test.ts
@@ -194,7 +194,7 @@ test("handleResponsesCore preserves store for Codex responses when connection op
   });
 
   assert.equal(result.success, true);
-  assert.equal(call.body.previous_response_id, undefined);
+  assert.equal(call.body.previous_response_id, "resp_prev_store");
   assert.equal(call.body.store, true);
   assert.equal(call.body.stream, true);
 });