docstr: Tests generator on empty input.
docstr_tok: ["Tests","generator","on","empty","input","."]
code: def test_time_stats_generator_empty_input(self):
      """Tests generator on empty input."""
      generator = time_stats_generator.TimeStatsGenerator()
      self.assertCombinerOutputEqual(
          [], generator, statistics_pb2.FeatureNameStatistics()
      )
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from unittest import mock
  from absl.testing import absltest
  from absl.testing import parameterized
  import pyarrow
  from tensorflow_data_validation import types
  from tensorflow_data_validation.statistics.generators import time_stats_generator
  from tensorflow_data_validation.utils import test_util
  from tensorflow_metadata.proto.v0 import schema_pb2
  from tensorflow_metadata.proto.v0 import statistics_pb2
label_desc: Use image node_id 2 for calling the TimeStatsGeneratorTest obj's underlying member method code with example usage: obj.test_time_stats_generator_empty_input() without return types