class_docstr: Dummy channel for testing.
class_docstr_tok: ["Dummy","channel","for","testing","."]
code: def __hash__(self):
      return hash(self.type)
  
imports: import typing
  from typing import Callable, Dict, Iterable, Iterator, List, Optional, Sequence, Set, Type, cast
  from tfx.dsl.placeholder import placeholder
  from tfx.proto.orchestration import placeholder_pb2
  from tfx.types import artifact
  from tfx.types import channel
label_desc: Use image node_id 2 for calling the ChannelForTesting obj's underlying member method code with example usage: obj.__hash__() and returns: hash