diff --git a/tests/test_four_phase_unit.py b/tests/test_four_phase_unit.py
index 2462071..2a85a6e 100644
--- a/tests/test_four_phase_unit.py
+++ b/tests/test_four_phase_unit.py
@@ -536,3 +536,95 @@ class TestU10ReviewPrompt:
         assert "失败处理" in prompt
         assert "2 个" in prompt  # "有 2 个 sub task failed"
         assert "第 2 轮" in prompt
+
+
+class TestU11ReviewingState:
+    """reviewing 中间态防重复触发"""
+
+    def test_reviewing_skipped_in_round_check(self, project_env):
+        """reviewing 状态的 parent 不触发一轮结束检测"""
+        tmpdir, pid, bb = project_env
+        parent = _make_task(bb, "parent-1")
+        _make_task(bb, "s1", parent_task=parent)
+
+        # sub done
+        bb.update_task_status("s1", "claimed", agent="test")
+        bb.update_task_status("s1", "working", agent="test")
+        bb.update_task_status("s1", "review", agent="test")
+        bb.update_task_status("s1", "done", agent="test")
+
+        # parent done → reviewing
+        bb.update_task_status("parent-1", "claimed", agent="test")
+        bb.update_task_status("parent-1", "working", agent="test")
+        bb.update_task_status("parent-1", "review", agent="test")
+        bb.update_task_status("parent-1", "done", agent="test")
+        bb.update_task_status("parent-1", "reviewing", agent="daemon")
+
+        # 验证 summary 返回 reviewing
+        summary = bb.get_subtasks_summary("parent-1")
+        assert summary is not None
+        assert summary["parent_status"] == "reviewing"
+
+        # reviewing 不在 ("done", "failed") 中 → _check_round_complete 应跳过
+        assert summary["parent_status"] not in ("done", "failed")
+
+    def test_reviewing_not_overwritten_by_aggregation(self, project_env):
+        """reviewing 是 MANUAL_STATUS，不被 compute_parent_status 覆盖"""
+        tmpdir, pid, bb = project_env
+        parent = _make_task(bb, "parent-2")
+        _make_task(bb, "s1", parent_task=parent)
+
+        # sub done
+        bb.update_task_status("s1", "claimed", agent="test")
+        bb.update_task_status("s1", "working", agent="test")
+        bb.update_task_status("s1", "review", agent="test")
+        bb.update_task_status("s1", "done", agent="test")
+
+        # parent done → reviewing
+        bb.update_task_status("parent-2", "claimed", agent="test")
+        bb.update_task_status("parent-2", "working", agent="test")
+        bb.update_task_status("parent-2", "review", agent="test")
+        bb.update_task_status("parent-2", "done", agent="test")
+        bb.update_task_status("parent-2", "reviewing", agent="daemon")
+
+        # compute_parent_status 应返回 reviewing（不覆盖）
+        from src.blackboard.queries import Queries
+        q = Queries(bb.db_path)
+        computed = q.compute_parent_status("parent-2")
+        assert computed == "reviewing"
+
+    def test_reviewing_to_done_transition(self, project_env):
+        """reviewing → done 转换合法（GOAL_ACHIEVED 时）"""
+        tmpdir, pid, bb = project_env
+        parent = _make_task(bb, "parent-3")
+
+        bb.update_task_status("parent-3", "claimed", agent="test")
+        bb.update_task_status("parent-3", "working", agent="test")
+        bb.update_task_status("parent-3", "review", agent="test")
+        bb.update_task_status("parent-3", "done", agent="test")
+        bb.update_task_status("parent-3", "reviewing", agent="daemon")
+
+        # reviewing → done（GOAL_ACHIEVED 后）
+        result = bb.update_task_status("parent-3", "done", agent="daemon")
+        assert result is True
+
+        task = bb.get_task("parent-3")
+        assert task.status == "done"
+
+    def test_reviewing_to_working_transition(self, project_env):
+        """reviewing → working 转换合法（继续下一轮时）"""
+        tmpdir, pid, bb = project_env
+        parent = _make_task(bb, "parent-4")
+
+        bb.update_task_status("parent-4", "claimed", agent="test")
+        bb.update_task_status("parent-4", "working", agent="test")
+        bb.update_task_status("parent-4", "review", agent="test")
+        bb.update_task_status("parent-4", "done", agent="test")
+        bb.update_task_status("parent-4", "reviewing", agent="daemon")
+
+        # reviewing → working（继续下一轮）
+        result = bb.update_task_status("parent-4", "working", agent="daemon")
+        assert result is True
+
+        task = bb.get_task("parent-4")
+        assert task.status == "working"