code: def test_overlaps_variant_empty_range(self):
      variant = variants_pb2.Variant(
          reference_name="chr2", start=10, end=11
      )
      empty_set = ranges.RangeSet()
      self.assertEqual(
          empty_set.variant_overlaps(
              variant, empty_set_return_value="foo"
          ),
          "foo",
      )
  
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 9 for calling the RangesTests obj's underlying member method code with example usage: obj.test_overlaps_variant_empty_range() without return types