code: def test_simple_routing():
      f = Flow().add(uses=SimplExecutor)
      with f:
          docs = f.post(on="/index", inputs=[Document()])
          assert docs[0].text == "Hello World!"
  
imports: from docarray import Document, DocumentArray
  from jina import Executor, Flow, requests
  import pytest
label_desc: Use image node_id 1 for calling a global function with example usage: test_simple_routing() without return types