Fix attachments not take effect in agentic chat (#17895)

test/unit_test/rag/advanced_rag/test_agentic_rag.py

@@ -0,0 +1,31 @@
+from copy import deepcopy
+
+import pytest
+
+from rag.advanced_rag.agentic_rag import RAGTools
+
+
+class FakeChatModel:
+    max_length = 8192
+
+    def clone(self):
+        return self
+
+
+@pytest.mark.asyncio
+async def test_rag_tool_adds_text_attachment_as_evidence(monkeypatch):
+    captured = {}
+
+    async def fake_run_agentic_rag(tools, messages):
+        captured["kbinfos"] = deepcopy(tools.kbinfos)
+        captured["messages"] = messages
+        yield "answer"
+
+    monkeypatch.setattr("rag.advanced_rag.agentic_rag_graph.run_agentic_rag", fake_run_agentic_rag)
+
+    tools = RAGTools([], FakeChatModel(), text_attachments_content="attached facts")
+
+    assert await tools.rag("What is attached?") == "answer"
+    assert captured["messages"] == [{"role": "user", "content": "What is attached?"}]
+    assert captured["kbinfos"]["chunks"][0]["docnm_kwd"] == "Chat attachment"
+    assert captured["kbinfos"]["chunks"][0]["content_with_weight"] == "attached facts"