code: def testInvalidSourceAsChannelFail(self):
      with self.assertRaises(ValueError):
          channel_utils.as_channel(artifacts="invalid artifacts")
  
file_path: tfx/tfx/types/channel_utils_test.py
imports: import tensorflow
  from tfx.dsl.placeholder import placeholder
  from tfx.types import artifact
  from tfx.types import channel
  from tfx.types import channel_utils
  from tfx.types import standard_artifacts
label_desc: Use image node_id 3 for calling the ChannelUtilsTest obj's underlying member method code with example usage: obj.testInvalidSourceAsChannelFail() without return types