chore: import upstream snapshot with attribution

examples/flows/chat/chat-with-pdf-maf/test_multi_node.py

@@ -0,0 +1,38 @@
+import asyncio
+
+from workflow_multi_node import ChatInput, create_workflow
+
+
+async def main():
+    # Single-turn test
+    workflow = create_workflow()
+    result = await workflow.run(
+        ChatInput(
+            question="what NLP tasks does it perform well?",
+            pdf_url="https://arxiv.org/pdf/1810.04805.pdf",
+        )
+    )
+    output = result.get_outputs()[0]
+    print(f"Answer: {output['answer']}")
+    print(f"Context: {output['context']}")
+
+    # Multi-turn test
+    workflow2 = create_workflow()
+    result2 = await workflow2.run(
+        ChatInput(
+            question="Can you elaborate on the fine-tuning approach?",
+            pdf_url="https://arxiv.org/pdf/1810.04805.pdf",
+            chat_history=[
+                {
+                    "inputs": {"question": "what NLP tasks does it perform well?"},
+                    "outputs": {"answer": output["answer"]},
+                }
+            ],
+        )
+    )
+    output2 = result2.get_outputs()[0]
+    print(f"\nFollow-up Answer: {output2['answer']}")
+
+
+if __name__ == "__main__":
+    asyncio.run(main())