Фикс состояния

tests/unit_tests/chat/test_direct_service.py

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+import asyncio
+
+from app.modules.chat.direct_service import CodeExplainChatService
+from app.modules.chat.session_resolver import ChatSessionResolver
+from app.modules.chat.task_store import TaskStore
+from app.modules.rag.explain.models import ExplainIntent, ExplainPack
+from app.schemas.chat import ChatFileContext, ChatMessageRequest
+
+
+class _FakeRetriever:
+    def build_pack(self, rag_session_id: str, user_query: str, *, file_candidates: list[dict] | None = None) -> ExplainPack:
+        return ExplainPack(
+            intent=ExplainIntent(raw_query=user_query, normalized_query=user_query),
+            missing=["code_excerpts"],
+        )
+
+
+class _FakeLlm:
+    def __init__(self) -> None:
+        self.calls = 0
+
+    def generate(self, prompt_name: str, user_input: str, *, log_context: str | None = None) -> str:
+        self.calls += 1
+        return "should not be called"
+
+
+class _FakeDialogs:
+    def get(self, dialog_session_id: str):
+        return None
+
+
+def test_direct_service_skips_llm_when_evidence_is_insufficient() -> None:
+    messages: list[tuple[str, str, str, str | None]] = []
+    llm = _FakeLlm()
+    task_store = TaskStore()
+    service = CodeExplainChatService(
+        retriever=_FakeRetriever(),
+        llm=llm,
+        session_resolver=ChatSessionResolver(_FakeDialogs(), lambda rag_session_id: rag_session_id == "rag-1"),
+        task_store=task_store,
+        message_sink=lambda dialog_session_id, role, content, task_id=None: messages.append((dialog_session_id, role, content, task_id)),
+    )
+
+    result = asyncio.run(
+        service.handle_message(
+            ChatMessageRequest(
+                session_id="dialog-1",
+                project_id="rag-1",
+                message="Explain get_user",
+                files=[ChatFileContext(path="app/api/users.py", content="", content_hash="x")],
+            )
+        )
+    )
+
+    task = task_store.get(result.task_id)
+    assert task is not None
+    assert task.answer is not None
+    assert "Недостаточно опоры в коде" in task.answer
+    assert result.status == "done"
+    assert llm.calls == 0
+    assert [item[1] for item in messages] == ["user", "assistant"]