code: def test_parse_literal_chromosomes(self, chrom):
      self.assertEqual(
          ranges.parse_literal(chrom + ":1-20"),
          ranges.make_range(chrom, 0, 20),
      )
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import itertools
  from absl.testing import absltest
  from absl.testing import parameterized
  import mock
  from third_party.nucleus.protos import position_pb2
  from third_party.nucleus.protos import reference_pb2
  from third_party.nucleus.protos import variants_pb2
  from third_party.nucleus.testing import test_utils
  from third_party.nucleus.util import ranges
label_desc: Use image node_id 15 for calling the RangesTests obj's underlying member method code with example usage: obj.test_parse_literal_chromosomes(chrom) without return types