Add a test.

diff --git a/tests/base/index_set_35.cc b/tests/base/index_set_35.cc
new file mode 100644 (file)
index 0000000..dd44e0a
--- /dev/null
+++ b/tests/base/index_set_35.cc
@@ -0,0 +1,50 @@
+// ---------------------------------------------------------------------
+//
+// Copyright (C) 2010 - 2018 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.
+//
+// ---------------------------------------------------------------------
+
+
+// Ensure that we can compare IndexSet objects against the empty
+// object. (Comparisons between IndexSet objects of different sizes
+// are otherwise not allowed.)
+
+#include <deal.II/base/index_set.h>
+
+#include <stdlib.h>
+
+#include "../tests.h"
+
+
+void
+test()
+{
+  IndexSet is1(100);
+  IndexSet is2;
+
+  Assert((is1 == is2) == false, ExcInternalError());
+  Assert((is2 != is1) == true, ExcInternalError());
+  Assert((is1 == is2) == false, ExcInternalError());
+  Assert((is2 != is1) == true, ExcInternalError());
+
+  deallog << "OK" << std::endl;
+}
+
+
+
+int
+main()
+{
+  initlog();
+
+  test();
+}

diff --git a/tests/base/index_set_35.output b/tests/base/index_set_35.output
new file mode 100644 (file)
index 0000000..0fd8fc1
--- /dev/null
+++ b/tests/base/index_set_35.output
@@ -0,0 +1,2 @@
+
+DEAL::OK