litellm/tests/unit/test_xai_responses_auto_routing.py

"""
Test automatic routing to xAI Responses API when tools are present
"""

import json
from collections.abc import Mapping
from typing import Final
from unittest.mock import MagicMock, patch

import httpx
import pytest
import litellm
from litellm.llms.custom_httpx.http_handler import HTTPHandler
from litellm.main import responses_api_bridge_check


class _RecordingResponsesHandler:
    """MockTransport handler that serves a canned /responses reply and keeps the body xAI would have received"""

    def __init__(self, reply: Mapping[str, object]) -> None:
        self.reply: Final = reply
        self.request_body: Mapping[str, object] | None = None

    def __call__(self, request: httpx.Request) -> httpx.Response:
        self.request_body = json.loads(request.content)
        return httpx.Response(200, json=dict(self.reply), request=request)


class TestXAIResponsesAutoRouting:
    """Test that xAI requests with tools automatically route to Responses API"""

    def test_responses_api_bridge_check_without_tools(self):
        """Test that without tools, xAI uses chat mode"""
        model = "grok-3"
        custom_llm_provider = "xai"
        tools = None
        web_search_options = None

        model_info, updated_model = responses_api_bridge_check(
            model=model,
            custom_llm_provider=custom_llm_provider,
            web_search_options=web_search_options,
        )

        # Should not auto-route to responses mode without tools
        assert model_info.get("mode") != "responses"
        assert updated_model == model


    def test_responses_api_bridge_check_with_empty_tools(self):
        """Test that with empty tools list, xAI does not route to Responses API"""
        model = "grok-3"
        custom_llm_provider = "xai"
        tools = []
        web_search_options = None

        model_info, updated_model = responses_api_bridge_check(
            model=model,
            custom_llm_provider=custom_llm_provider,
            web_search_options=web_search_options,
        )

        # Should not auto-route with empty tools list
        assert model_info.get("mode") != "responses"
        assert updated_model == model

    def test_responses_api_bridge_check_non_xai_provider_with_tools(self):
        """Test that non-xAI providers don't get auto-routed"""
        model = "gpt-4"
        custom_llm_provider = "openai"
        tools = [
            {
                "type": "function",
                "function": {
                    "name": "get_weather",
                    "description": "Get the weather",
                },
            }
        ]
        web_search_options = None

        model_info, updated_model = responses_api_bridge_check(
            model=model,
            custom_llm_provider=custom_llm_provider,
            web_search_options=web_search_options,
        )

        # Should not auto-route non-xAI providers
        assert model_info.get("mode") != "responses"
        assert updated_model == model

    def test_responses_api_bridge_check_with_responses_prefix(self):
        """Test that responses/ prefix still works"""
        model = "responses/grok-3"
        custom_llm_provider = "xai"
        tools = None
        web_search_options = None

        model_info, updated_model = responses_api_bridge_check(
            model=model,
            custom_llm_provider=custom_llm_provider,
            web_search_options=web_search_options,
        )

        # Should route to responses mode with prefix, even without tools
        assert model_info.get("mode") == "responses"
        assert updated_model == "grok-3"  # prefix removed




    def test_responses_api_bridge_check_with_web_search_options(self):
        """Test auto-routing with web_search_options"""
        model = "grok-4-1-fast"
        custom_llm_provider = "xai"
        tools = None
        web_search_options = {}  # Empty dict should trigger routing

        model_info, updated_model = responses_api_bridge_check(
            model=model,
            custom_llm_provider=custom_llm_provider,
            web_search_options=web_search_options,
        )

        # Should auto-route with web_search_options
        assert model_info.get("mode") == "responses"
        assert updated_model == model

    def test_responses_api_bridge_check_with_web_search_options_and_tools(self):
        """Test auto-routing with both web_search_options and tools"""
        model = "grok-4"
        custom_llm_provider = "xai"
        tools = [{"type": "code_interpreter"}]
        web_search_options = {"enabled": True}

        model_info, updated_model = responses_api_bridge_check(
            model=model,
            custom_llm_provider=custom_llm_provider,
            web_search_options=web_search_options,
        )

        # Should auto-route with both present
        assert model_info.get("mode") == "responses"
        assert updated_model == model

    def test_responses_api_bridge_check_with_web_search_options_on_unmapped_model(self):
        """web search must reach /responses even for a model missing from the cost map, chat returns 410"""
        model_info, updated_model = responses_api_bridge_check(
            model="grok-not-in-cost-map",
            custom_llm_provider="xai",
            web_search_options={"search_context_size": "medium"},
        )

        assert model_info.get("mode") == "responses"
        assert updated_model == "grok-not-in-cost-map"

    @patch("litellm.completion_extras.responses_api_bridge.completion")
    def test_completion_with_tools_routes_to_responses_api(
        self, mock_responses_completion
    ):
        """Test that completion() with tools routes to Responses API"""
        # Mock the responses_api_bridge.completion to avoid actual API calls
        mock_responses_completion.return_value = MagicMock()

        model = "xai/grok-3"
        messages = [{"role": "user", "content": "What's the weather?"}]
        tools = [
            {
                "type": "function",
                "function": {
                    "name": "get_weather",
                    "description": "Get weather info",
                    "parameters": {
                        "type": "object",
                        "properties": {"location": {"type": "string"}},
                    },
                },
            }
        ]

        try:
            litellm.completion(
                model=model,
                messages=messages,
                tools=tools,
                mock_response="This is a test",  # Use mock mode to avoid API calls
            )
        except Exception:
            # It's ok if this fails, we just want to verify the routing logic
            pass

        # The mock should have been called, indicating responses API was used
        # Note: This test may need adjustment based on actual mock_response behavior
        # The key is that the responses_api_bridge_check logic routes correctly

    def test_system_message_survives_web_search_bridge(self):
        """A system message becomes 'instructions' on the bridged /responses call, and xAI accepts it"""
        handler: Final = _RecordingResponsesHandler(
            reply={
                "id": "resp_test",
                "object": "response",
                "created_at": 0,
                "status": "completed",
                "model": "grok-4.6",
                "output": [
                    {
                        "type": "message",
                        "id": "msg_test",
                        "status": "completed",
                        "role": "assistant",
                        "content": [{"type": "output_text", "text": "1.0.0", "annotations": []}],
                    }
                ],
                "usage": {"input_tokens": 1, "output_tokens": 1, "total_tokens": 2},
            }
        )

        response: Final = litellm.completion(
            model="xai/grok-4.6",
            messages=[
                {"role": "system", "content": "Answer briefly."},
                {"role": "user", "content": "newest litellm version?"},
            ],
            web_search_options={"search_context_size": "medium"},
            api_key="fake-key",
            client=HTTPHandler(client=httpx.Client(transport=httpx.MockTransport(handler))),
        )

        assert response.choices[0].message.content == "1.0.0"
        assert handler.request_body is not None
        assert handler.request_body["instructions"] == "Answer briefly."
        assert handler.request_body["tools"] == [{"type": "web_search"}]


if __name__ == "__main__":
    pytest.main([__file__, "-v"])