code: def testAsProto(self):
      self.assertTrue(
          tensor_shape.unknown_shape().as_proto().unknown_rank
      )
      self.assertFalse(
          tensor_shape.unknown_shape(rank=3).as_proto().unknown_rank
      )
      self.assertFalse(
          tensor_shape.TensorShape([1, 2, 3]).as_proto().unknown_rank
      )
      self.assertFalse(
          tensor_shape.TensorShape([1, None, 3]).as_proto().unknown_rank
      )
  
imports: from absl.testing import parameterized
  from tensorflow.core.framework import tensor_shape_pb2
  from tensorflow.core.function import trace_type
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import tensor_shape
  from tensorflow.python.framework import test_util
  from tensorflow.python.platform import googletest
label_desc: Use image node_id 17 for calling the ShapeTest obj's underlying member method code with example usage: obj.testAsProto() without return types