code: def _format_expected_variant(ref, alts, format_spec, *samples):
      base = ["20", 1, ".", ref, alts, 0, ".", ".", format_spec]
      return base + list(samples)
  
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 etils import epath
  from third_party.nucleus.io import vcf
  from third_party.nucleus.protos import reference_pb2
  from third_party.nucleus.protos import struct_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 1 for calling a global function with example usage: _format_expected_variant(ref, alts, format_spec) and returns: unknown