test_both_sync_and_async_middleware_uses_appropriate_path() — langchain Function Reference

Source Code

libs/langchain_v1/tests/unit_tests/agents/middleware/core/test_sync_async_wrappers.py lines 175–217

    def test_both_sync_and_async_middleware_uses_appropriate_path(self) -> None:
        """Middleware with both sync and async uses correct implementation per path."""
        call_log = []

        class BothSyncAsyncMiddleware(AgentMiddleware):
            def wrap_tool_call(
                self,
                request: ToolCallRequest,
                handler: Callable[[ToolCallRequest], ToolMessage | Command[Any]],
            ) -> ToolMessage | Command[Any]:
                call_log.append("sync_called")
                return handler(request)

            async def awrap_tool_call(
                self,
                request: ToolCallRequest,
                handler: Callable[[ToolCallRequest], Awaitable[ToolMessage | Command[Any]]],
            ) -> ToolMessage | Command[Any]:
                call_log.append("async_called")
                return await handler(request)

        model = FakeToolCallingModel(
            tool_calls=[
                [ToolCall(name="search", args={"query": "test"}, id="1")],
                [],
            ]
        )

        agent = create_agent(
            model=model,
            tools=[search],
            middleware=[BothSyncAsyncMiddleware()],
            checkpointer=InMemorySaver(),
        )

        # Sync path
        call_log.clear()
        agent.invoke(
            {"messages": [HumanMessage("Search")]},
            {"configurable": {"thread_id": "test1"}},
        )
        assert "sync_called" in call_log
        assert "async_called" not in call_log