*    dA =  U
     *    dB = -U
     *
     */

    // Grad for A
    DCHECK(grad_outputs[0]);
    grad_inputs[0] = grad_outputs[0];
    grad_inputs[0]->Ref();

    // Grad for B
    // negate the upstream grad
    std::string name = "Neg_Sub_Grad_B";
    TF_RETURN_IF_ERROR(
        ops::Neg(ctx, grad_outputs[0], &grad_inputs[1], name.c_str()));

    return absl::OkStatus();
  }

             {{"scalar10_0:output:0", "scalar10"}}, {});
}

TEST_F(CApiFunctionTest, OneOp_OneInput_OneOutput) {
  /*
   *                   |
   *                   v
   *                 negate
   *                   |
   *                   v
   */
  // Define
  TF_Operation* feed = Placeholder(func_graph_, s_);
  TF_Operation* neg = Neg(feed, func_graph_, s_);
  Define(-1, {}, {feed}, {neg}, {});