"""Phase 1 tests: LLM client.

Covers:
- OpenAI-compatible API client for Qwen LLM
- Provider switching via .env (OpenRouter, Alibaba Cloud, vLLM)
- Error handling for API failures
- Mocked responses in test mode
"""
import pytest


class TestLLMClient:
    """LLM client tests (all external calls mocked)."""

    def test_llm_call_success(self, mock_llm_client):
        """Should return structured response from mocked LLM."""
        pass  # TODO: implement

    def test_llm_provider_switching(self):
        """Should switch base URL based on .env config."""
        pass  # TODO: implement

    def test_llm_api_error_handling(self):
        """Should handle HTTP errors from LLM provider."""
        pass  # TODO: implement