From 5095027e6e68e1e0a35987150d5652979120c82a Mon Sep 17 00:00:00 2001
From: Martin Kronbichler <kronbichler@lnm.mw.tum.de>
Date: Sat, 8 May 2021 12:19:28 +0200
Subject: [PATCH] Add test case

---
 .../copy_serial_tria_12.cc                    | 72 +++++++++++++++++++
 .../copy_serial_tria_12.mpirun=1.output       |  2 +
 2 files changed, 74 insertions(+)
 create mode 100644 tests/fullydistributed_grids/copy_serial_tria_12.cc
 create mode 100644 tests/fullydistributed_grids/copy_serial_tria_12.mpirun=1.output

diff --git a/tests/fullydistributed_grids/copy_serial_tria_12.cc b/tests/fullydistributed_grids/copy_serial_tria_12.cc
new file mode 100644
index 0000000000..d07ad85552
--- /dev/null
+++ b/tests/fullydistributed_grids/copy_serial_tria_12.cc
@@ -0,0 +1,72 @@
+// ---------------------------------------------------------------------
+//
+// Copyright (C) 2021 by the deal.II authors
+//
+// This file is part of the deal.II library.
+//
+// The deal.II library is free software; you can use it, redistribute
+// it, and/or modify it under the terms of the GNU Lesser General
+// Public License as published by the Free Software Foundation; either
+// version 2.1 of the License, or (at your option) any later version.
+// The full text of the license can be found in the file LICENSE.md at
+// the top level directory of deal.II.
+//
+// ---------------------------------------------------------------------
+
+
+// Create a serial triangulation with empty cell_info fields and copy it.
+
+#include <deal.II/base/mpi.h>
+
+#include <deal.II/distributed/fully_distributed_tria.h>
+#include <deal.II/distributed/shared_tria.h>
+#include <deal.II/distributed/tria.h>
+
+#include <deal.II/fe/fe_q.h>
+
+#include <deal.II/grid/grid_generator.h>
+#include <deal.II/grid/grid_out.h>
+#include <deal.II/grid/grid_tools.h>
+#include <deal.II/grid/tria.h>
+#include <deal.II/grid/tria_description.h>
+
+#include "./tests.h"
+
+using namespace dealii;
+
+template <int dim>
+void
+test(MPI_Comm comm)
+{
+  // create serial triangulation
+  Triangulation<dim> basetria;
+  GridGenerator::hyper_cube(basetria);
+
+  // create instance of pft
+  parallel::fullydistributed::Triangulation<dim> tria_pft(comm);
+
+  // extract relevant information form serial triangulation
+  auto construction_data =
+    TriangulationDescription::Utilities::create_description_from_triangulation(
+      basetria, comm);
+
+  // create some empty levels to imitate empty levels on some MPI processes
+  construction_data.cell_infos.resize(basetria.n_levels() + 2);
+
+  // actually create triangulation
+  tria_pft.create_triangulation(construction_data);
+
+  // if everything went fine, we do not have bugs inside the library
+  deallog << "OK" << std::endl;
+}
+
+int
+main(int argc, char *argv[])
+{
+  Utilities::MPI::MPI_InitFinalize mpi_initialization(argc, argv, 1);
+  mpi_initlog();
+
+  const MPI_Comm comm = MPI_COMM_WORLD;
+
+  test<2>(comm);
+}
diff --git a/tests/fullydistributed_grids/copy_serial_tria_12.mpirun=1.output b/tests/fullydistributed_grids/copy_serial_tria_12.mpirun=1.output
new file mode 100644
index 0000000000..0fd8fc12f0
--- /dev/null
+++ b/tests/fullydistributed_grids/copy_serial_tria_12.mpirun=1.output
@@ -0,0 +1,2 @@
+
+DEAL::OK
-- 
2.39.5