code: def test_gvcf_basic(self, ref, include_med_dp):
      options = _reference_model_options(0.01, 100)
      caller = PlaceholderVariantCaller(0.01, 100)
      allele_counter = self.fake_allele_counter(100, [(0, 0, ref)])
      gvcfs = list(
          caller.make_gvcfs(
              allele_counter.summary_counts(), include_med_dp
          )
      )
      self.assertLen(gvcfs, 1)
      self.assertGVCF(
          gvcfs[0],
          ref=ref,
          gq=1.0,
          start=100,
          end=101,
          min_dp=0,
          chrom="chr1",
          gls=[-0.47712125472] * 3,
          sample_name=options.sample_name,
          med_dp=0 if include_med_dp else None,
      )
  
imports: from unittest import mock
  from absl.testing import absltest
  from absl.testing import parameterized
  import numpy
  import numpy.testing
  from third_party.nucleus.util import variant_utils
  from third_party.nucleus.util import variantcall_utils
  from deepvariant import testdata
  from deepvariant import variant_caller
  from deepvariant.protos import deepvariant_pb2
label_desc: Use image node_id 5 for calling the VariantCallerTests obj's underlying member method code with example usage: obj.test_gvcf_basic(ref, include_med_dp) without return types