From e7e1914499b0a653f160a064b87fc3e06393acb2 Mon Sep 17 00:00:00 2001
From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Thu, 11 Jan 2018 07:11:14 -0700
Subject: [PATCH] Add another test.

---
 tests/trilinos/n_nonzeros_02_parallel.cc      | 106 ++++++++++++++++++
 ...=9.with_trilinos=true.with_mpi=true.output |  26 +++++
 2 files changed, 132 insertions(+)
 create mode 100644 tests/trilinos/n_nonzeros_02_parallel.cc
 create mode 100644 tests/trilinos/n_nonzeros_02_parallel.mpirun=9.with_trilinos=true.with_mpi=true.output

diff --git a/tests/trilinos/n_nonzeros_02_parallel.cc b/tests/trilinos/n_nonzeros_02_parallel.cc
new file mode 100644
index 0000000000..ffd3025942
--- /dev/null
+++ b/tests/trilinos/n_nonzeros_02_parallel.cc
@@ -0,0 +1,106 @@
+// ---------------------------------------------------------------------
+//
+// Copyright (C) 2017 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 at
+// the top level of the deal.II distribution.
+//
+// ---------------------------------------------------------------------
+
+
+
+// check n_nonzero_elements() for an empty matrix
+
+#include "../tests.h"
+#include <deal.II/lac/trilinos_sparsity_pattern.h>
+#include <deal.II/lac/sparsity_pattern.h>
+#include <deal.II/lac/trilinos_sparse_matrix.h>
+#include <deal.II/dofs/dof_tools.h>
+#include <deal.II/dofs/dof_handler.h>
+#include <deal.II/fe/fe_q.h>
+#include <deal.II/grid/grid_generator.h>
+#include <deal.II/distributed/tria.h>
+
+
+void test ()
+{
+  parallel::distributed::Triangulation<2> tria (MPI_COMM_WORLD);
+  GridGenerator::hyper_cube (tria);
+  tria.refine_global (3);
+
+  FE_Q<2> fe(1);
+  DoFHandler<2> dof_handler (tria);
+  dof_handler.distribute_dofs(fe);
+
+  Table<2,DoFTools::Coupling> coupling (1,1);
+  coupling.fill (DoFTools::none);
+
+  const IndexSet system_partitioning = dof_handler.locally_owned_dofs();
+  IndexSet system_relevant_set;
+  DoFTools::extract_locally_relevant_dofs (dof_handler,
+                                           system_relevant_set);
+
+
+  // create an empty sparsity pattern
+  TrilinosWrappers::SparsityPattern sparsity;
+  sparsity.reinit (system_partitioning,
+                   system_partitioning,
+                   system_relevant_set,
+                   MPI_COMM_WORLD);
+  DoFTools::make_sparsity_pattern (dof_handler,
+                                   coupling, sparsity,
+                                   ConstraintMatrix(), false,
+                                   Utilities::MPI::
+                                   this_mpi_process(MPI_COMM_WORLD));
+  sparsity.compress ();
+
+  // attach a sparse matrix to it
+  TrilinosWrappers::SparseMatrix A;
+  A.reinit(sparsity);
+
+  // see how many nonzero elements it reports
+  deallog << A.n_nonzero_elements() << std::endl;
+}
+
+
+
+int main (int argc, char **argv)
+{
+  Utilities::MPI::MPI_InitFinalize mpi_initialization (argc, argv, 1);
+  MPILogInitAll log;
+
+  try
+    {
+      test ();
+    }
+  catch (std::exception &exc)
+    {
+      deallog << std::endl << std::endl
+              << "----------------------------------------------------"
+              << std::endl;
+      deallog << "Exception on processing: " << std::endl
+              << exc.what() << std::endl
+              << "Aborting!" << std::endl
+              << "----------------------------------------------------"
+              << std::endl;
+
+      return 1;
+    }
+  catch (...)
+    {
+      deallog << std::endl << std::endl
+              << "----------------------------------------------------"
+              << std::endl;
+      deallog << "Unknown exception!" << std::endl
+              << "Aborting!" << std::endl
+              << "----------------------------------------------------"
+              << std::endl;
+      return 1;
+    };
+}
diff --git a/tests/trilinos/n_nonzeros_02_parallel.mpirun=9.with_trilinos=true.with_mpi=true.output b/tests/trilinos/n_nonzeros_02_parallel.mpirun=9.with_trilinos=true.with_mpi=true.output
new file mode 100644
index 0000000000..6c072d8b3d
--- /dev/null
+++ b/tests/trilinos/n_nonzeros_02_parallel.mpirun=9.with_trilinos=true.with_mpi=true.output
@@ -0,0 +1,26 @@
+
+DEAL:0::0
+
+DEAL:1::0
+
+
+DEAL:2::0
+
+
+DEAL:3::0
+
+
+DEAL:4::0
+
+
+DEAL:5::0
+
+
+DEAL:6::0
+
+
+DEAL:7::0
+
+
+DEAL:8::0
+
-- 
2.39.5