code: def test_vcf_from_string_raises_on_bad_input(self):
      with self.assertRaises(ValueError):
          self.samples_reader.from_string("BAD NOT A VCF RECORD\n;;")
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from absl.testing import absltest
  from third_party.nucleus.io.python import vcf_reader
  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 WrapVcfReaderTests obj's underlying member method code with example usage: obj.test_vcf_from_string_raises_on_bad_input() without return types