code: def testCompileChannel(self):
      channel = channel_types.Channel(
          type=DummyArtifact,
          producer_component_id="MyProducer",
          output_key="my_output_key",
      )
      node = DummyNode("MyNode", inputs={"x": channel})
  
      result = self._compile_node_inputs(node)
  
      self.assertLen(result.inputs["x"].channels, 1)
      self.assertProtoEquals(
          result.inputs["x"].channels[0],
          self._get_channel_pb(
              node_id="MyProducer", output_key="my_output_key"
          ),
      )
  
imports: from typing import List, Type
  from absl.testing import parameterized
  import tensorflow
  from tfx import types
  from tfx.dsl.compiler import compiler_context
  from tfx.dsl.compiler import node_inputs_compiler
  from tfx.dsl.components.base import base_component
  from tfx.dsl.components.base import base_node
  from tfx.dsl.components.base import executor_spec
  from tfx.dsl.control_flow import for_each
  from tfx.dsl.experimental.conditionals import conditional
  from tfx.dsl.experimental.node_execution_options import utils
  from tfx.dsl.input_resolution import resolver_function
  from tfx.dsl.input_resolution import resolver_op
  from tfx.dsl.placeholder import placeholder
  from tfx.orchestration import pipeline
  from tfx.proto.orchestration import pipeline_pb2
  from tfx.types import channel
  from tfx.types import channel_utils
  from tfx.types import component_spec
  from tfx.types import standard_artifacts
  from google.protobuf import text_format
label_desc: Use image node_id 5 for calling the NodeInputsCompilerTest obj's underlying member method code with example usage: obj.testCompileChannel() without return types