code: def testPickResolverFn_E2E(self):
      spans = [0, 1, 2]
      versions = [0, 0, 0]
      self._insert_artifacts_into_mlmd(spans, versions)
      xs = channel_utils.artifact_query(
          artifact_type=test_utils.DummyArtifact
      )
  
      for i in range(-3, 3):
          with self.subTest(i=i):
              x = canned_resolver_functions.pick(xs, i)
              pipeline_node = test_utils.compile_inputs({"x": x})
              resolved = inputs_utils.resolve_input_artifacts(
                  pipeline_node=pipeline_node,
                  metadata_handle=self.mlmd_handle,
              )
              self.assertLen(resolved, 1)
              self.assertEqual(resolved[0]["x"][0].span, spans[i])
  
imports: from typing import Sequence
  import tensorflow
  from tfx import types
  from tfx.dsl.control_flow import for_each
  from tfx.dsl.input_resolution import canned_resolver_functions
  from tfx.dsl.input_resolution import resolver_op
  from tfx.dsl.input_resolution.ops import test_utils
  from tfx.orchestration import pipeline
  from tfx.orchestration.portable import inputs_utils
  from tfx.orchestration.portable.input_resolution import exceptions
  from tfx.types import channel_utils
  from tfx.types import resolved_channel
  from ml_metadata.proto import metadata_store_pb2
label_desc: Use image node_id 21 for calling the CannedResolverFunctionsTest obj's underlying member method code with example usage: obj.testPickResolverFn_E2E() without return types