diff --git a/tests/test_four_phase_unit.py b/tests/test_four_phase_unit.py
index b7f723d..d7df249 100644
--- a/tests/test_four_phase_unit.py
+++ b/tests/test_four_phase_unit.py
@@ -213,7 +213,6 @@ class TestU3RoundComplete:
         ticker._build_review_prompt = MagicMock(return_value="Review prompt mock")
                         spawner=mock_spawner, dispatcher=MagicMock())
         # mock _build_review_prompt（f-string 在 Python 3.9 有兼容性问题）
-        ticker._build_review_prompt = MagicMock(return_value="Review prompt mock")
 
         async def run():
             result = await ticker._check_round_complete(db_path, pid)
@@ -243,6 +242,7 @@ class TestU3RoundComplete:
 
         ticker = Ticker(registry=MagicMock(), spawner=MagicMock(),
                         dispatcher=MagicMock())
+        ticker._build_review_prompt = MagicMock(return_value="Review prompt mock")
 
         async def run():
             return await ticker._check_round_complete(db_path, pid)
@@ -313,6 +313,7 @@ class TestU5RoundLimit:
 
         ticker = Ticker(registry=MagicMock(), spawner=MagicMock(),
                         dispatcher=MagicMock())
+        ticker._build_review_prompt = MagicMock(return_value="Review prompt mock")
 
         async def run():
             return await ticker._check_round_complete(db_path, pid)
@@ -383,6 +384,7 @@ class TestU6MentionGrouping:
 
         ticker = Ticker(registry=MagicMock(), spawner=mock_spawner,
                         dispatcher=MagicMock())
+        ticker._build_review_prompt = MagicMock(return_value="Review prompt mock")
 
         async def run():
             return await ticker._process_mentions(db_path, pid)