StructuredValue ZeroReturnOutputSignature();

// Returns a StructuredValue corresponding to the serialized OutputSignature of
// a tf.function with a single tensor output
StructuredValue SingleReturnOutputSignature();

// Returns a StructuredValue corresponding to the serialized OutputSignature of
// a tf.function with three tensor outputs
StructuredValue ThreeReturnOutputSignature();

}  // namespace testing

  // `saved` has 0 inputs, 1 output
  SavedConcreteFunction saved;
  *saved.mutable_canonicalized_input_signature() =
      testing::ZeroArgInputSignature();
  *saved.mutable_output_signature() = testing::SingleReturnOutputSignature();

  // `func` has 0 inputs, 2 outputs
  FunctionDef func = FuncDefWithNumInputsOutputs(0, 2);

  std::unique_ptr<TFConcreteFunction> result;
  Status status =