code: def test_partitions(self, interval_size, expected):
      rangeset = ranges.RangeSet(
          [
              ranges.make_range("chrM", 0, 100),
              ranges.make_range("chr1", 0, 76),
              ranges.make_range("chr2", 0, 121),
          ]
      )
      self.assertEqual(
          [ranges.make_range(*args) for args in expected],
          list(rangeset.partition(interval_size)),
      )
  
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 26 for calling the RangesTests obj's underlying member method code with example usage: obj.test_partitions(interval_size, expected) without return types