test(qwen): red phase for Qwen via DashScope (5 failing tests)

5 failing tests in tests/test_qwen_provider.py that establish the
core behaviors of the new Qwen (DashScope) provider:

1. test_send_qwen_routes_to_dashscope: _send_qwen calls _ensure_qwen_client
   and _dashscope_call, returns the text from the DashScope response
2. test_qwen_vision_vl_model_accepts_image: when file_items contains an
   image, the messages passed to _dashscope_call include the image ref
3. test_qwen_tool_format_translation: build_dashscope_tools converts
   OpenAI-shaped tool dicts to DashScope shape (name/description/parameters
   flat structure, not wrapped in function:)
4. test_qwen_error_classification: classify_dashscope_error maps
   dashscope.common.error.InvalidApiKey -> ProviderError(kind='auth',
   provider='qwen')
5. test_list_qwen_models_returns_hardcoded_registry: _list_qwen_models
   returns the 7 Qwen models registered in src/vendor_capabilities.py

The autouse _reset_qwen_state fixture uses hasattr() so it is a no-op
when _qwen_client / _qwen_history do not exist (yet); this keeps the
fixture working in the Red phase.

All 5 tests fail:
- Tests 1, 2: AttributeError: src.ai_client has no _ensure_qwen_client /
  _send_qwen / _dashscope_call
- Tests 3, 4: ModuleNotFoundError: No module named src.qwen_adapter
- Test 5: ImportError: cannot import name _list_qwen_models

Test signature adapted to match the real _send_minimax signature at
src/ai_client.py:2143-2148 (10 params, no enable_tools / rag_engine)
rather than the plan's 12-param signature.

Next: Green phase - implement src/qwen_adapter.py + src/ai_client.py
state + _ensure_qwen_client + _send_qwen + _list_qwen_models.

tests/test_qwen_provider.py

@@ -0,0 +1,55 @@
+from unittest.mock import MagicMock, patch
+import pytest
+from src import ai_client
+
+@pytest.fixture(autouse=True)
+def _reset_qwen_state():
+ if hasattr(ai_client, '_qwen_client'):
+  ai_client._qwen_client = None
+ if hasattr(ai_client, '_qwen_history'):
+  ai_client._qwen_history = []
+ yield
+
+def test_send_qwen_routes_to_dashscope(monkeypatch: pytest.MonkeyPatch) -> None:
+ ai_client.set_provider("qwen", "qwen-max")
+ with patch("src.ai_client._ensure_qwen_client") as ensure, \
+  patch("src.ai_client._dashscope_call", return_value={"text": "hi from qwen", "tool_calls": [], "usage": {"input_tokens": 10, "output_tokens": 5}}) as call:
+  result = ai_client._send_qwen("system", "user", ".", None, "", False, None, None, None)
+  assert result == "hi from qwen"
+  call.assert_called_once()
+  ensure.assert_called_once()
+
+def test_qwen_vision_vl_model_accepts_image(monkeypatch: pytest.MonkeyPatch) -> None:
+ ai_client.set_provider("qwen", "qwen-vl-max")
+ with patch("src.ai_client._ensure_qwen_client"), \
+  patch("src.ai_client._dashscope_call", return_value={"text": "I see a cat", "tool_calls": [], "usage": {"input_tokens": 10, "output_tokens": 5}}) as call:
+  file_items = [{"path": "/tmp/cat.png", "is_image": True, "base64_data": "iVBOR..."}]
+  result = ai_client._send_qwen("system", "describe this image", ".", file_items, "", False, None, None, None)
+  assert "cat" in result.lower()
+  kwargs = call.call_args.kwargs
+  msgs_str = str(kwargs.get("messages", [])).lower()
+  assert "image" in msgs_str or "cat.png" in msgs_str
+
+def test_qwen_tool_format_translation() -> None:
+ from src.qwen_adapter import build_dashscope_tools
+ openai_tools = [{"type": "function", "function": {"name": "read_file", "description": "Read a file", "parameters": {"type": "object", "properties": {"path": {"type": "string"}}}}}]
+ ds_tools = build_dashscope_tools(openai_tools)
+ assert len(ds_tools) == 1
+ assert ds_tools[0]["name"] == "read_file"
+ assert "parameters" in ds_tools[0]
+
+def test_qwen_error_classification() -> None:
+ from src.ai_client import ProviderError
+ from src.qwen_adapter import classify_dashscope_error
+ import dashscope
+ err = classify_dashscope_error(dashscope.common.error.InvalidApiKey("bad key"))
+ assert err.kind == "auth"
+ assert err.provider == "qwen"
+
+def test_list_qwen_models_returns_hardcoded_registry() -> None:
+ from src.ai_client import _list_qwen_models
+ models = _list_qwen_models()
+ assert "qwen-max" in models
+ assert "qwen-vl-max" in models
+ assert "qwen-turbo" in models
+ assert "qwen-audio" in models