code: def test_detector_no_ranges(self):
      range_set = ranges.RangeSet()
      # don't have any ranges by default
      self.assertEqual(bool(range_set), False)
      # make sure we can call overlaps without any ranges
      self.assertFalse(range_set.overlaps("chr1", 10))
  
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 2 for calling the RangesTests obj's underlying member method code with example usage: obj.test_detector_no_ranges() without return types