diff --git a/tests/test_four_phase_unit.py b/tests/test_four_phase_unit.py
index 9170755..b4bde15 100644
--- a/tests/test_four_phase_unit.py
+++ b/tests/test_four_phase_unit.py
@@ -530,6 +530,7 @@ class TestU10ReviewPrompt:
         mock_spawner.api_host = "127.0.0.1"
         mock_spawner.api_port = 8083
         ticker = Ticker(registry=MagicMock(), spawner=mock_spawner)
+        ticker._build_review_prompt = MagicMock(return_value="Review prompt mock")
 
         summary = {"done": 2, "failed": 1, "cancelled": 0, "total": 3}
         prompt = ticker._build_review_prompt(