code: def test_get_reserved_filter(self):
      filt = vcf_constants.reserved_filter_field("PASS")
      self.assertIsInstance(filt, variants_pb2.VcfFilterInfo)
      self.assertEqual(filt.id, "PASS")
      self.assertEqual(filt.description, "All filters passed")
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from absl.testing import absltest
  from absl.testing import parameterized
  from third_party.nucleus.protos import variants_pb2
  from third_party.nucleus.util import struct_utils
  from third_party.nucleus.util import vcf_constants
label_desc: Use image node_id 4 for calling the VcfConstantsTest obj's underlying member method code with example usage: obj.test_get_reserved_filter() without return types