code: def test(self, verify_fn, symbolic_checkpoint, compression_type):
      num_files = 5
      lines_per_file = 5
      num_outputs = num_files * lines_per_file
      test_filenames = self._createFiles(
          num_files,
          lines_per_file,
          crlf=True,
          compression_type=compression_type,
      )
      verify_fn(
          self,
          lambda: self._build_iterator_graph(
              test_filenames, symbolic_checkpoint, compression_type
          ),
          num_outputs,
      )
  
imports: import gzip
  import os
  import pathlib
  import zlib
  from absl.testing import parameterized
  from tensorflow.python.data.kernel_tests import checkpoint_test_base
  from tensorflow.python.data.kernel_tests import test_base
  from tensorflow.python.data.ops import dataset_ops
  from tensorflow.python.data.ops import options
  from tensorflow.python.data.ops import readers
  from tensorflow.python.framework import combinations
  from tensorflow.python.framework import errors
  from tensorflow.python.platform import test
  from tensorflow.python.util import compat
label_desc: Use image node_id 2 for calling the TextLineDatasetCheckpointTest obj's underlying member method code with example usage: obj.test(verify_fn, symbolic_checkpoint, compression_type) without return types