code: def test_span_raises_on_bad_input(self, regions, regexp):
      with self.assertRaisesRegexp(ValueError, regexp):
          ranges.span(regions)
  
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 40 for calling the RangesTests obj's underlying member method code with example usage: obj.test_span_raises_on_bad_input(regions, regexp) without return types