chore: import upstream snapshot with attribution

test/cpp/compat/ATen_hook_test.cc

@@ -0,0 +1,50 @@
+// Copyright (c) 2026 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <ATen/Functions.h>
+#include <ATen/core/TensorBody.h>
+#include <ATen/ops/tensor.h>
+#include <c10/core/ScalarType.h>
+#include <c10/core/TensorOptions.h>
+
+#include "ATen/ATen.h"
+#include "gtest/gtest.h"
+#include "torch/all.h"
+
+// ======================== register_hook tests ========================
+
+TEST(TensorHookTest, RegisterHookThrows) {
+  // register_hook should throw exception as Paddle doesn't support hooks
+  at::Tensor t = at::arange(6, at::kFloat).reshape({2, 3});
+
+  auto hook = [](const at::Tensor& grad) { return grad; };
+  EXPECT_THROW(t.register_hook(hook), std::runtime_error);
+}
+
+TEST(TensorHookTest, RegisterHookWithLambda) {
+  at::Tensor t = at::arange(6, at::kFloat).reshape({2, 3});
+
+  // Lambda that captures nothing
+  EXPECT_THROW(t.register_hook([](const at::Tensor&) { return at::Tensor(); }),
+               std::runtime_error);
+}
+
+TEST(TensorHookTest, RegisterHookWithMoveOnly) {
+  at::Tensor t = at::arange(6, at::kFloat).reshape({2, 3});
+
+  // Move-only lambda
+  EXPECT_THROW(
+      t.register_hook([](const at::Tensor&) mutable { return at::Tensor(); }),
+      std::runtime_error);
+}