code: def test_from_bed(self, bed_filename):
      source = test_utils.genomics_core_testdata(bed_filename)
      self.assertCountEqual(
          [
              ranges.make_range("chr1", 1, 10),
              ranges.make_range("chr2", 20, 30),
              ranges.make_range("chr2", 40, 60),
              ranges.make_range("chr3", 80, 90),
          ],
          ranges.RangeSet.from_bed(source),
      )
  
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 19 for calling the RangesTests obj's underlying member method code with example usage: obj.test_from_bed(bed_filename) without return types