From 6cab70b25af0f8d55d6b11dd056ae135a2676e4d Mon Sep 17 00:00:00 2001
From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Thu, 28 Oct 2021 14:54:09 -0600
Subject: [PATCH] Add another test for simplex-mesh DataOutFaces.

---
 tests/simplex/data_out_faces_01.cc     | 107 +++++
 tests/simplex/data_out_faces_01.output | 550 +++++++++++++++++++++++++
 2 files changed, 657 insertions(+)
 create mode 100644 tests/simplex/data_out_faces_01.cc
 create mode 100644 tests/simplex/data_out_faces_01.output

diff --git a/tests/simplex/data_out_faces_01.cc b/tests/simplex/data_out_faces_01.cc
new file mode 100644
index 0000000000..e5fe7dec0a
--- /dev/null
+++ b/tests/simplex/data_out_faces_01.cc
@@ -0,0 +1,107 @@
+// ---------------------------------------------------------------------
+//
+// Copyright (C) 2020 - 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.
+//
+// ---------------------------------------------------------------------
+
+
+
+// Test DataOutFaces::write_vtk() for simplex meshes.
+
+#include <deal.II/base/quadrature_lib.h>
+
+#include <deal.II/dofs/dof_handler.h>
+
+#include <deal.II/fe/fe_pyramid_p.h>
+#include <deal.II/fe/fe_simplex_p.h>
+#include <deal.II/fe/fe_simplex_p_bubbles.h>
+#include <deal.II/fe/fe_system.h>
+#include <deal.II/fe/fe_wedge_p.h>
+#include <deal.II/fe/mapping_fe.h>
+
+#include <deal.II/grid/grid_generator.h>
+#include <deal.II/grid/grid_in.h>
+#include <deal.II/grid/grid_out.h>
+#include <deal.II/grid/tria.h>
+
+#include <deal.II/numerics/data_out_faces.h>
+#include <deal.II/numerics/vector_tools.h>
+
+#include "../tests.h"
+
+using namespace dealii;
+
+template <int dim>
+class RightHandSideFunction : public Function<dim>
+{
+public:
+  RightHandSideFunction(const unsigned int n_components)
+    : Function<dim>(n_components)
+  {}
+
+  virtual double
+  value(const Point<dim> &p, const unsigned int component = 0) const
+  {
+    return p[component % dim] * p[component % dim];
+  }
+};
+
+template <int dim, int spacedim = dim>
+void
+test(const FiniteElement<dim, spacedim> &fe, const unsigned int n_components)
+{
+  Triangulation<dim, spacedim> tria;
+  GridGenerator::subdivided_hyper_cube_with_simplices(tria, dim == 2 ? 4 : 2);
+
+  DoFHandler<dim> dof_handler(tria);
+  dof_handler.distribute_dofs(fe);
+
+  Vector<double> solution(dof_handler.n_dofs());
+
+  VectorTools::interpolate(dof_handler,
+                           RightHandSideFunction<dim>(n_components),
+                           solution);
+
+  DataOutFaces<dim> data_out;
+
+  data_out.attach_dof_handler(dof_handler);
+  data_out.add_data_vector(solution, "solution");
+
+  data_out.build_patches();
+
+#if true
+  static unsigned int counter = 0;
+  std::ofstream       output("test." + std::to_string(dim) +
+                       std::to_string(counter++) + ".vtk");
+  data_out.write_vtk(output);
+#endif
+
+  data_out.write_vtk(deallog.get_file_stream());
+}
+
+int
+main()
+{
+  initlog();
+
+  {
+    const int dim = 2;
+    test<dim>(FE_SimplexP<dim>(2) /*=degree*/, 1);
+    test<dim>(FESystem<dim>(FE_SimplexP<dim>(2 /*=degree*/), dim), dim);
+  }
+
+  {
+    const int dim = 3;
+    test<dim>(FE_SimplexP<dim>(2) /*=degree*/, 1);
+    test<dim>(FESystem<dim>(FE_SimplexP<dim>(2 /*=degree*/), dim), dim);
+  }
+}
diff --git a/tests/simplex/data_out_faces_01.output b/tests/simplex/data_out_faces_01.output
new file mode 100644
index 0000000000..ae8e5dc08b
--- /dev/null
+++ b/tests/simplex/data_out_faces_01.output
@@ -0,0 +1,550 @@
+
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2.39.5