diff --git a/apps/api/tests/test_governance_agent.py b/apps/api/tests/test_governance_agent.py
index c9460f1b..edb59437 100644
--- a/apps/api/tests/test_governance_agent.py
+++ b/apps/api/tests/test_governance_agent.py
@@ -398,17 +398,19 @@ class TestRunSelfCheck:
 
     @pytest.mark.asyncio
     async def test_all_checks_fail_returns_all_errors(self):
-        """所有項目全部失敗 → 4 個 key 都有 error"""
+        """所有項目全部失敗 → 5 個 key 都有 error（2026-04-27 P3.4 加入 slo_compliance）"""
         agent = _make_agent()
 
         for attr in ["check_trust_drift", "check_knowledge_degradation",
-                     "check_llm_hallucination", "check_execution_blast_radius"]:
+                     "check_llm_hallucination", "check_execution_blast_radius",
+                     "check_slo_compliance"]:
             setattr(agent, attr, AsyncMock(side_effect=Exception("mock failure")))
 
         results = await agent.run_self_check()
 
-        assert len(results) == 4
-        for key in ["trust_drift", "knowledge_degradation", "llm_hallucination", "execution_blast_radius"]:
+        assert len(results) == 5
+        for key in ["trust_drift", "knowledge_degradation", "llm_hallucination",
+                    "execution_blast_radius", "slo_compliance"]:
             assert "error" in results[key]
 
 
@@ -514,13 +516,14 @@ class TestRunSelfCheckGlobalFailureAlert:
 
     @pytest.mark.asyncio
     async def test_all_four_checks_fail_triggers_alert_with_four_failed(self):
-        """4 項全失敗 → governance_self_failure 告警的 failed_checks 包含全部 4 個"""
+        """5 項全失敗 → governance_self_failure 告警的 failed_checks 包含全部 5 個（2026-04-27 P3.4 加 slo_compliance）"""
         alerter = AsyncMock()
         alerter.alert_governance = AsyncMock()
         agent = _make_agent(alerter=alerter)
 
         for attr in ["check_trust_drift", "check_knowledge_degradation",
-                     "check_llm_hallucination", "check_execution_blast_radius"]:
+                     "check_llm_hallucination", "check_execution_blast_radius",
+                     "check_slo_compliance"]:
             setattr(agent, attr, AsyncMock(side_effect=Exception("all down")))
 
         with patch("src.services.governance_agent.get_db_context") as mock_ctx:
@@ -534,8 +537,8 @@ class TestRunSelfCheckGlobalFailureAlert:
         assert len(governance_failure_calls) >= 1
 
         payload = governance_failure_calls[0][0][1]
-        assert payload["total_checks"] == 4
-        assert len(payload["failed_checks"]) == 4
+        assert payload["total_checks"] == 5
+        assert len(payload["failed_checks"]) == 5
 
     @pytest.mark.asyncio
     async def test_two_checks_fail_does_not_trigger_governance_self_failure(self):
diff --git a/apps/api/tests/test_wave8_remaining_blockers.py b/apps/api/tests/test_wave8_remaining_blockers.py
index cacb81e4..86e6ea5b 100644
--- a/apps/api/tests/test_wave8_remaining_blockers.py
+++ b/apps/api/tests/test_wave8_remaining_blockers.py
@@ -225,11 +225,12 @@ class TestB8GovernanceFailureAlert:
         from src.services.governance_agent import GovernanceAgent
 
         agent = GovernanceAgent()
-        # mock 四項 check：3 個 raise，1 個成功
+        # 2026-04-27 P3.4: mock 五項 check（含 slo_compliance）：3 raise，2 成功
         agent.check_trust_drift = AsyncMock(side_effect=RuntimeError("DB down"))
         agent.check_knowledge_degradation = AsyncMock(side_effect=RuntimeError("KM error"))
         agent.check_llm_hallucination = AsyncMock(side_effect=RuntimeError("LLM error"))
         agent.check_execution_blast_radius = AsyncMock(return_value={"status": "ok"})
+        agent.check_slo_compliance = AsyncMock(return_value={"status": "ok"})
 
         agent._alert = AsyncMock()
 
@@ -240,7 +241,7 @@ class TestB8GovernanceFailureAlert:
         call_args = agent._alert.await_args
         assert call_args[0][0] == "governance_self_failure"
         payload = call_args[0][1]
-        assert payload["total_checks"] == 4
+        assert payload["total_checks"] == 5
         assert len(payload["failed_checks"]) >= 3
 
     @pytest.mark.asyncio
@@ -249,10 +250,12 @@ class TestB8GovernanceFailureAlert:
         from src.services.governance_agent import GovernanceAgent
 
         agent = GovernanceAgent()
+        # 2026-04-27 P3.4: 加 slo_compliance（成功）
         agent.check_trust_drift = AsyncMock(side_effect=RuntimeError("err1"))
         agent.check_knowledge_degradation = AsyncMock(side_effect=RuntimeError("err2"))
         agent.check_llm_hallucination = AsyncMock(return_value={"status": "ok"})
         agent.check_execution_blast_radius = AsyncMock(return_value={"status": "ok"})
+        agent.check_slo_compliance = AsyncMock(return_value={"status": "ok"})
 
         agent._alert = AsyncMock()
 
@@ -267,10 +270,12 @@ class TestB8GovernanceFailureAlert:
         from src.services.governance_agent import GovernanceAgent
 
         agent = GovernanceAgent()
+        # 2026-04-27 P3.4: 5 項全失敗
         agent.check_trust_drift = AsyncMock(side_effect=RuntimeError("e"))
         agent.check_knowledge_degradation = AsyncMock(side_effect=RuntimeError("e"))
         agent.check_llm_hallucination = AsyncMock(side_effect=RuntimeError("e"))
         agent.check_execution_blast_radius = AsyncMock(side_effect=RuntimeError("e"))
+        agent.check_slo_compliance = AsyncMock(side_effect=RuntimeError("e"))
 
         agent._alert = AsyncMock()
 
@@ -278,4 +283,4 @@ class TestB8GovernanceFailureAlert:
 
         agent._alert.assert_awaited_once()
         payload = agent._alert.await_args[0][1]
-        assert len(payload["failed_checks"]) == 4
+        assert len(payload["failed_checks"]) == 5