code: def testInvalidChannelType(self):
      instance_a = _MyType()
      instance_b = _MyType()
      with self.assertRaises(ValueError):
          channel.Channel(_AnotherType).set_artifacts(
              [instance_a, instance_b]
          )
  
imports: from unittest import mock
  import tensorflow
  from tfx.dsl.input_resolution import resolver_op
  from tfx.dsl.placeholder import placeholder
  from tfx.types import artifact
  from tfx.types import channel
  from tfx.types import resolved_channel
  from google.protobuf import struct_pb2
  from ml_metadata.proto import metadata_store_pb2
label_desc: Use image node_id 2 for calling the ChannelTest obj's underlying member method code with example usage: obj.testInvalidChannelType() without return types