diff --git a/apps/api/tests/test_p2_db_fixes.py b/apps/api/tests/test_p2_db_fixes.py
index acf18bb9f..bc2a56696 100644
--- a/apps/api/tests/test_p2_db_fixes.py
+++ b/apps/api/tests/test_p2_db_fixes.py
@@ -20,7 +20,7 @@ from __future__ import annotations
 import re
 from pathlib import Path
 from typing import Any
-from unittest.mock import AsyncMock, MagicMock, patch
+from unittest.mock import ANY, AsyncMock, MagicMock, call, patch
 
 import pytest
 
@@ -174,8 +174,13 @@ class TestConsensusEnginePersistsToPg:
 
                 await engine._save_consensus(result)
 
-        # Redis 寫（保留熱快取）
-        mock_redis.set.assert_called_once()
+        # Redis Phase A 雙寫（新 namespace + legacy 熱快取）
+        mock_redis.set.assert_has_calls(
+            [
+                call("__platform__:consensus:CS-TEST-001", ANY, ex=3600),
+                call("consensus:CS-TEST-001", ANY, ex=3600),
+            ]
+        )
 
         # PG 寫（永久記錄）
         mock_db.execute.assert_called_once()
@@ -244,8 +249,13 @@ class TestConsensusEnginePersistsToPg:
                 # 不應拋例外
                 await engine._save_consensus(result)
 
-        # Redis 已完成（在 PG 嘗試之前）
-        mock_redis.set.assert_called_once()
+        # Redis Phase A 雙寫已完成（在 PG 嘗試之前）
+        mock_redis.set.assert_has_calls(
+            [
+                call("__platform__:consensus:CS-TEST-001", ANY, ex=3600),
+                call("consensus:CS-TEST-001", ANY, ex=3600),
+            ]
+        )
 
 
 # =============================================================================