test: 更新 AgentScope 相关单元测试与集成测试

- 重命名 test_react_runner.py 为 test_runner.py
- 新增 test_utils.py 测试工具函数
- 更新现有测试用例适配新架构

backend/tests/unit/v1/agent/test_repository.py

@@ -45,6 +45,12 @@ async def test_snapshot_message_returns_raw_db_columns() -> None:
         seq=7,
         role=AgentChatMessageRole.TOOL,
         content='{"offloaded":true}',
+        model_code=None,
+        tool_name=None,
+        input_tokens=0,
+        output_tokens=0,
+        cost=0,
+        latency_ms=None,
         metadata_json={"tool_call_id": "call-1"},
         created_at=now,
     )
@@ -71,8 +77,7 @@ async def test_persist_user_message_sets_session_title_when_empty() -> None:
 
     await repository.persist_user_message(
         session_id=session_id,
-        run_id="run-1",
-        content_text="  请帮我安排明天下午开会  ",
+        content="  请帮我安排明天下午开会  ",
         metadata=None,
     )
 
@@ -94,10 +99,68 @@ async def test_persist_user_message_keeps_existing_session_title() -> None:
 
     await repository.persist_user_message(
         session_id=session_id,
-        run_id="run-2",
-        content_text="新的消息内容",
+        content="新的消息内容",
         metadata=None,
     )
 
     assert session_row.title == "已有标题"
     assert session_row.message_count == 2
+
+
+class _ScalarRows:
+    def __init__(self, rows: list[object]) -> None:
+        self._rows = rows
+
+    def all(self) -> list[object]:
+        return self._rows
+
+
+class _ExecuteRowsResult:
+    def __init__(self, rows: list[object]) -> None:
+        self._rows = rows
+
+    def scalars(self) -> _ScalarRows:
+        return _ScalarRows(self._rows)
+
+
+class _FakeHistorySession:
+    def __init__(self) -> None:
+        self._execute_count = 0
+
+    async def execute(self, stmt):  # noqa: ANN001
+        del stmt
+        self._execute_count += 1
+        if self._execute_count == 1:
+            return _ExecuteResult(datetime(2026, 3, 16, 11, 0, tzinfo=timezone.utc))
+        if self._execute_count == 2:
+            message = SimpleNamespace(
+                id=uuid4(),
+                seq=1,
+                role=AgentChatMessageRole.USER,
+                content="hello",
+                model_code=None,
+                tool_name=None,
+                input_tokens=0,
+                output_tokens=0,
+                cost=0,
+                latency_ms=None,
+                metadata_json=None,
+                created_at=datetime(2026, 3, 16, 11, 0, tzinfo=timezone.utc),
+            )
+            return _ExecuteRowsResult([message])
+        return _ExecuteResult(uuid4())
+
+
+@pytest.mark.asyncio
+async def test_get_history_day_uses_target_day_queries_only() -> None:
+    session = _FakeHistorySession()
+    repository = AgentRepository(session=session)  # type: ignore[arg-type]
+
+    payload = await repository.get_history_day(session_id=str(uuid4()), before=None)
+
+    assert payload is not None
+    assert payload["day"] == "2026-03-16"
+    assert payload["hasMore"] is True
+    messages = payload["messages"]
+    assert isinstance(messages, list)
+    assert len(messages) == 1