class_docstr: Test Nodes
code: def test_excpetion(self):
      pipe = RuntimePipeline(self.dag)
      with self.assertRaises(RuntimeError):
          pipe("x", [1])
  
file_path: towhee/tests/unittests/runtime/test_nodes.py
imports: import unittest
  import copy
  import threading
  from towhee.runtime.runtime_pipeline import RuntimePipeline
  from towhee.datacollection.data_collection import DataCollection
label_desc: Use image node_id 3 for calling the TestNodesWithFlatMap obj's underlying member method code with example usage: obj.test_excpetion() without return types