code: def setUp(self):
      super().setUp()
      self.alts = ["A"]
      self.variant = variants_pb2.Variant(
          reference_name="1",
          start=10,
          end=11,
          reference_bases="C",
          alternate_bases=self.alts,
      )
      self.encoded_image = b"encoded_image_data"
      self.default_shape = [5, 5, 7]
  
imports: from absl.testing import absltest
  from absl.testing import parameterized
  import tensorflow
  from deepvariant import dv_utils
  from tensorflow.python.platform import gfile
  from third_party.nucleus.io import tfrecord
  from third_party.nucleus.protos import variants_pb2
  from third_party.nucleus.testing import test_utils
  from tensorflow.core.example import example_pb2
label_desc: Use image node_id 1 for calling the TFUtilsTest obj's underlying member method code with example usage: obj.setUp() without return types