code: def testNormalizeToShardedFilePattern(self, spec, expected):
      self.assertEqual(
          expected, io.normalize_to_sharded_file_pattern(spec)
      )
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from absl.testing import absltest
  from absl.testing import parameterized
  from third_party.nucleus.io import sharded_file_utils
  from third_party.nucleus.testing import test_utils
label_desc: Use image node_id 9 for calling the ShardsTest obj's underlying member method code with example usage: obj.testNormalizeToShardedFilePattern(spec, expected) without return types