add std::dims test

libcudacxx/test/libcudacxx/std/containers/views/mdspan/mdspan.extents.dims/compare.pass.cpp

@@ -0,0 +1,28 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+// SPDX-FileCopyrightText: Copyright (c) 2023 NVIDIA CORPORATION & AFFILIATES.
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++11
+// UNSUPPORTED: msvc && c++14, msvc && c++17
+
+#include <cuda/std/cassert>
+#include <cuda/std/mdspan>
+
+int main(int, char**)
+{
+  {
+    using index_t = size_t;
+
+    cuda::std::dextents<index_t, 3> e0{1, 2, 3};
+    cuda::std::dims<3> e1{1, 2, 3};
+
+    assert(e0 == e1);
+  }
+
+  return 0;
+}