code: def test_reserved_format_field_get_fn(self):
      info = variants_pb2.VariantCall().info
      expected = [0.2, 0.5, 0.3]
      struct_utils.set_number_field(info, "GP", expected[:])
      get_fn = vcf_constants.reserved_format_field_get_fn("GP")
      actual = get_fn(info, "GP")
      self.assertEqual(actual, expected)
  
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 17 for calling the VcfConstantsTest obj's underlying member method code with example usage: obj.test_reserved_format_field_get_fn() without return types