code: def test_touching_boundaries(self):
      # Nothing to read.
      instruction = splits._AbsoluteInstruction("train", 0, 0)
      files = self._get_files(instruction)
      self.assertEqual(files, [])
  
      instruction = splits._AbsoluteInstruction("train", None, 0)
      files = self._get_files(instruction)
      self.assertEqual(files, [])
  
      instruction = splits._AbsoluteInstruction("train", 3, 3)
      files = self._get_files(instruction)
      self.assertEqual(files, [])
  
      instruction = splits._AbsoluteInstruction("train", 13, None)
      files = self._get_files(instruction)
      self.assertEqual(files, [])
  
imports: from tensorflow_datasets import testing
  from tensorflow_datasets.core import naming
  from tensorflow_datasets.core import proto
  from tensorflow_datasets.core import splits
  from tensorflow_datasets.core.utils import shard_utils
  import tensorflow_datasets.public_api
label_desc: Use image node_id 7 for calling the GetDatasetFilesTest obj's underlying member method code with example usage: obj.test_touching_boundaries() without return types