code: def fake_allele_counter(self, start_pos, counts):
      allele_counter = mock.Mock()
      # pylint: disable=g-complex-comprehension
      allele_counter.summary_counts.return_value = [
          deepvariant_pb2.AlleleCountSummary(
              ref_supporting_read_count=n_ref,
              total_read_count=n_ref + n_alt,
              ref_base=ref,
              reference_name="chr1",
              position=start_pos + i,
          )
          for i, (n_alt, n_ref, ref) in enumerate(counts)
      ]
      # pylint: enable=g-complex-comprehension
      allele_counter.counts.return_value = counts
      return allele_counter
  
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 1 for calling the VariantCallerTests obj's underlying member method code with example usage: obj.fake_allele_counter(start_pos, counts) and returns: allele_counter