class_docstr: Test Pipeline
class_docstr_tok: ["Test","Pipeline"]
code: def test_callable_func(self):
      def func(x):
          return x + 2
  
      pipe = Pipeline.input("A").map("A", "cRes", func).output("cRes")
      res = pipe(1).get()
      self.assertEqual(res[0], 3)
  
imports: import unittest
  from towhee.operator.nop import NOPNodeOperator
  from towhee.operator import PyOperator
  from towhee.runtime.pipeline import Pipeline
  from towhee.runtime.data_queue import Empty
  from towhee.runtime import ops, register
  from towhee.runtime.runtime_pipeline import RuntimePipeline
label_desc: Use image node_id 3 for calling the TestPipeline obj's underlying member method code with example usage: obj.test_callable_func() and returns: unknown