From 9b04ac41734946ce81a37364259ed0848bab9e19 Mon Sep 17 00:00:00 2001
From: Wolfgang Bangerth <bangerth@math.tamu.edu>
Date: Wed, 10 Dec 2014 20:46:29 -0600
Subject: [PATCH] Add a test.

---
 tests/hp/interpolate_nothing_01.cc     | 87 ++++++++++++++++++++++++++
 tests/hp/interpolate_nothing_01.output |  4 ++
 2 files changed, 91 insertions(+)
 create mode 100644 tests/hp/interpolate_nothing_01.cc
 create mode 100644 tests/hp/interpolate_nothing_01.output

diff --git a/tests/hp/interpolate_nothing_01.cc b/tests/hp/interpolate_nothing_01.cc
new file mode 100644
index 0000000000..9803f2899a
--- /dev/null
+++ b/tests/hp/interpolate_nothing_01.cc
@@ -0,0 +1,87 @@
+// ---------------------------------------------------------------------
+//
+// Copyright (C) 2014 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 that VectorTools::interpolate works for FE_Nothing
+// elements. this is another confirmation that we had previously fixed
+// a bug again reported by Krishna Garikipati but that had previously
+// been addressed by ensuring that
+// FE_Nothing::has_unit_support_points() returns true
+
+#include "../tests.h"
+#include <deal.II/base/function.h>
+#include <deal.II/base/logstream.h>
+#include <deal.II/base/quadrature_lib.h>
+#include <deal.II/lac/vector.h>
+
+#include <deal.II/grid/tria.h>
+#include <deal.II/hp/dof_handler.h>
+#include <deal.II/grid/grid_generator.h>
+#include <deal.II/grid/grid_refinement.h>
+#include <deal.II/grid/tria_accessor.h>
+#include <deal.II/grid/tria_iterator.h>
+#include <deal.II/grid/tria_boundary_lib.h>
+#include <deal.II/dofs/dof_accessor.h>
+#include <deal.II/dofs/dof_tools.h>
+#include <deal.II/numerics/vector_tools.h>
+#include <deal.II/fe/fe_q.h>
+#include <deal.II/fe/fe_system.h>
+#include <deal.II/fe/fe_nothing.h>
+#include <deal.II/hp/q_collection.h>
+
+#include <fstream>
+#include <vector>
+
+
+template <int dim>
+void test ()
+{
+  Triangulation<dim>     triangulation;
+  GridGenerator::hyper_cube (triangulation);
+  triangulation.refine_global (3);
+
+  hp::FECollection<dim> hp_fe;
+  hp_fe.push_back(FESystem<dim>(FE_Q<dim>(2), 1, FE_Nothing<dim>(), 1));
+  hp::DoFHandler<dim>        dof_handler(triangulation);
+  dof_handler.distribute_dofs (hp_fe);
+
+  Vector<double> interpolant (dof_handler.n_dofs());
+  Vector<float>  error (triangulation.n_active_cells());
+
+  // interpolate the function
+  VectorTools::interpolate (dof_handler,
+			    ZeroFunction<dim>(hp_fe[0].n_components()),
+			    interpolant);
+  deallog << interpolant.l2_norm() << std::endl;
+}
+
+
+
+int main ()
+{
+  std::ofstream logfile("output");
+  logfile.precision (3);
+  deallog << std::setprecision(3);
+
+  deallog.attach(logfile);
+  deallog.depth_console(0);
+  deallog.threshold_double(1.e-10);
+
+  test<1>();
+  test<2>();
+  test<3>();
+}
+
diff --git a/tests/hp/interpolate_nothing_01.output b/tests/hp/interpolate_nothing_01.output
new file mode 100644
index 0000000000..70626d7e3f
--- /dev/null
+++ b/tests/hp/interpolate_nothing_01.output
@@ -0,0 +1,4 @@
+
+DEAL::0
+DEAL::0
+DEAL::0
-- 
2.39.5