char proto[] = {0x0, 0x0, 0x0, 0x0};
  func_ = TF_FunctionImportFunctionDef(proto, 4, s_);
  EXPECT_TRUE(func_ == nullptr);
  EXPECT_EQ(TF_INVALID_ARGUMENT, TF_GetCode(s_));
  EXPECT_EQ(
      std::string("Invalid FunctionDef given to TF_FunctionImportFunctionDef"),
      std::string(TF_Message(s_)));
}

TEST_F(CApiFunctionTest, Attribute) {

// Returns:
//  On success, a newly created TF_Function instance. It must be deleted by
//  calling TF_DeleteFunction.
//
//  On failure, null.
TF_CAPI_EXPORT extern TF_Function* TF_FunctionImportFunctionDef(
    const void* proto, size_t proto_len, TF_Status* status);

// Sets function attribute named `attr_name` to value stored in `proto`.
// If this attribute is already set to another value, it is overridden.