From bacc5d6d0dfb77e44a97dfdc0d92ded52ae107b6 Mon Sep 17 00:00:00 2001
From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Tue, 16 Nov 2021 21:37:10 -0700
Subject: [PATCH] Add more tests.

---
 tests/grid/grid_in_comsol_mphtxt_02.cc        |  116 +
 tests/grid/grid_in_comsol_mphtxt_02.output    |   13 +
 .../comsol/busbar_with_selections.mphtxt      | 3105 +++++++++++++++++
 .../grids/comsol/mesh_example_intro.mphtxt    |  215 ++
 ...esh_example_with_complete_geom_info.mphtxt |  221 ++
 .../mesh_example_with_domain_geom_info.mphtxt |   73 +
 ...h_example_with_domain_geom_info_1_7.mphtxt |   73 +
 ...sh_example_without_domain_geom_info.mphtxt |   64 +
 8 files changed, 3880 insertions(+)
 create mode 100644 tests/grid/grid_in_comsol_mphtxt_02.cc
 create mode 100644 tests/grid/grid_in_comsol_mphtxt_02.output
 create mode 100644 tests/grid/grids/comsol/busbar_with_selections.mphtxt
 create mode 100644 tests/grid/grids/comsol/mesh_example_intro.mphtxt
 create mode 100644 tests/grid/grids/comsol/mesh_example_with_complete_geom_info.mphtxt
 create mode 100644 tests/grid/grids/comsol/mesh_example_with_domain_geom_info.mphtxt
 create mode 100644 tests/grid/grids/comsol/mesh_example_with_domain_geom_info_1_7.mphtxt
 create mode 100644 tests/grid/grids/comsol/mesh_example_without_domain_geom_info.mphtxt

diff --git a/tests/grid/grid_in_comsol_mphtxt_02.cc b/tests/grid/grid_in_comsol_mphtxt_02.cc
new file mode 100644
index 0000000000..7fe668df78
--- /dev/null
+++ b/tests/grid/grid_in_comsol_mphtxt_02.cc
@@ -0,0 +1,116 @@
+// ---------------------------------------------------------------------
+//
+// Copyright (C) 2004 - 2020 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.
+//
+// ---------------------------------------------------------------------
+
+
+
+// Check whether we can read in meshes in COMSOL's .mphtxt format.
+//
+// Compared to the _01 test, we here read in a whole bunch of other
+// meshes but output less detailed information about them.
+
+#include <deal.II/grid/grid_in.h>
+#include <deal.II/grid/grid_out.h>
+#include <deal.II/grid/tria.h>
+#include <deal.II/grid/tria_accessor.h>
+#include <deal.II/grid/tria_iterator.h>
+
+#include "../tests.h"
+
+
+
+template <int dim>
+void
+comsol_grid(const char *name)
+{
+  Triangulation<dim> tria;
+  GridIn<dim>        grid_in;
+  grid_in.attach_triangulation(tria);
+  std::ifstream input_file(name);
+  grid_in.read_comsol_mphtxt(input_file);
+
+  deallog << "  " << tria.n_active_cells() << " active cells" << std::endl;
+
+  int hash  = 0;
+  int index = 0;
+  for (typename Triangulation<dim>::active_cell_iterator c =
+         tria.begin_active();
+       c != tria.end();
+       ++c, ++index)
+    for (const unsigned int i : c->vertex_indices())
+      hash += (index * i * c->vertex_index(i)) % (tria.n_active_cells() + 1);
+  deallog << "  hash=" << hash << std::endl;
+
+#if 0
+  {
+    static int    output_file = 0;
+    GridOut       go;
+    std::ofstream o("x-" + std::to_string(output_file) + ".gnuplot");
+    go.write_gnuplot(tria, o);
+
+    ++output_file;
+  }
+
+#endif
+}
+
+
+int
+main()
+{
+  initlog();
+
+  try
+    {
+      comsol_grid<3>(SOURCE_DIR "/grids/comsol/mesh_example_intro.mphtxt");
+      comsol_grid<3>(
+        SOURCE_DIR "/grids/comsol/mesh_example_with_complete_geom_info.mphtxt");
+      comsol_grid<3>(
+        SOURCE_DIR
+        "/grids/comsol/mesh_example_with_domain_geom_info_1_7.mphtxt");
+      comsol_grid<3>(SOURCE_DIR
+                     "/grids/comsol/mesh_example_with_domain_geom_info.mphtxt");
+      comsol_grid<3>(
+        SOURCE_DIR
+        "/grids/comsol/mesh_example_without_domain_geom_info.mphtxt");
+      comsol_grid<3>(SOURCE_DIR "/grids/comsol/busbar_with_selections.mphtxt");
+    }
+  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;
+    };
+
+  return 0;
+}
diff --git a/tests/grid/grid_in_comsol_mphtxt_02.output b/tests/grid/grid_in_comsol_mphtxt_02.output
new file mode 100644
index 0000000000..8a4a6160b9
--- /dev/null
+++ b/tests/grid/grid_in_comsol_mphtxt_02.output
@@ -0,0 +1,13 @@
+
+DEAL::  7 active cells
+DEAL::  hash=74
+DEAL::  7 active cells
+DEAL::  hash=71
+DEAL::  7 active cells
+DEAL::  hash=71
+DEAL::  7 active cells
+DEAL::  hash=71
+DEAL::  7 active cells
+DEAL::  hash=74
+DEAL::  638 active cells
+DEAL::  hash=604750
diff --git a/tests/grid/grids/comsol/busbar_with_selections.mphtxt b/tests/grid/grids/comsol/busbar_with_selections.mphtxt
new file mode 100644
index 0000000000..c180a52eef
--- /dev/null
+++ b/tests/grid/grids/comsol/busbar_with_selections.mphtxt
@@ -0,0 +1,3105 @@
+# Created by COMSOL Multiphysics.
+
+# Major & minor version
+0 1 
+4 # number of tags
+# Tags
+5 mesh1 
+10 mesh1_sel1 
+10 mesh1_sel2 
+10 mesh1_sel3 
+4 # number of types
+# Types
+3 obj 
+3 obj 
+3 obj 
+3 obj 
+
+# --------- Object 0 ----------
+
+0 0 1 
+4 Mesh # class
+4 # version
+3 # sdim
+232 # number of mesh vertices
+0 # lowest mesh vertex index
+
+# Mesh vertex coordinates
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+0.014999999999999999 -0.043500000000000004 -0.0049999999999999992 
+0.0090000000000000011 -0.037500000000000006 -0.0049999999999999992 
+0.010757357680414054 -0.041742639054651996 -0.0050000000000000001 
+
+4 # number of element types
+
+# Type #0
+
+3 vtx # type name
+
+
+1 # number of vertices per element
+52 # number of elements
+# Elements
+1 
+3 
+8 
+9 
+11 
+12 
+14 
+21 
+22 
+26 
+33 
+38 
+40 
+42 
+44 
+48 
+75 
+89 
+105 
+106 
+108 
+114 
+130 
+133 
+138 
+140 
+141 
+153 
+157 
+160 
+163 
+169 
+171 
+172 
+173 
+174 
+186 
+187 
+195 
+198 
+202 
+204 
+209 
+211 
+212 
+215 
+216 
+217 
+222 
+225 
+229 
+230 
+
+52 # number of geometric entity indices
+# Geometric entity indices
+51 
+50 
+39 
+36 
+45 
+37 
+49 
+48 
+44 
+47 
+33 
+35 
+43 
+34 
+42 
+41 
+46 
+38 
+40 
+31 
+30 
+32 
+29 
+28 
+21 
+20 
+19 
+25 
+26 
+27 
+7 
+16 
+9 
+8 
+2 
+3 
+18 
+17 
+1 
+24 
+23 
+15 
+6 
+12 
+0 
+14 
+22 
+13 
+11 
+5 
+10 
+4 
+
+# Type #1
+
+3 edg # type name
+
+
+2 # number of vertices per element
+177 # number of elements
+# Elements
+1 0 
+0 3 
+3 4 
+6 9 
+5 11 
+11 1 
+12 6 
+12 11 
+13 1 
+14 13 
+20 14 
+21 20 
+4 21 
+9 22 
+22 5 
+22 3 
+24 22 
+8 26 
+8 27 
+29 8 
+9 30 
+27 33 
+26 34 
+36 12 
+38 36 
+39 11 
+38 40 
+40 39 
+40 14 
+41 38 
+42 41 
+30 42 
+43 40 
+42 44 
+44 43 
+44 24 
+44 21 
+33 48 
+26 48 
+49 29 
+51 33 
+34 52 
+48 61 
+63 49 
+52 64 
+66 51 
+61 72 
+74 63 
+64 75 
+80 66 
+75 81 
+76 82 
+72 87 
+89 76 
+89 74 
+75 90 
+81 94 
+82 95 
+95 96 
+98 80 
+94 101 
+96 102 
+101 103 
+102 104 
+87 105 
+103 105 
+106 89 
+108 107 
+90 108 
+106 109 
+109 110 
+114 98 
+104 114 
+107 115 
+110 116 
+115 119 
+105 122 
+123 106 
+108 125 
+116 127 
+127 128 
+128 129 
+129 130 
+130 114 
+119 132 
+132 133 
+122 133 
+125 134 
+135 123 
+138 139 
+138 140 
+137 141 
+140 141 
+141 142 
+143 140 
+146 138 
+150 130 
+133 151 
+142 153 
+153 154 
+140 155 
+145 156 
+156 135 
+155 157 
+157 153 
+134 159 
+159 144 
+139 160 
+160 157 
+163 137 
+164 163 
+169 164 
+154 169 
+170 171 
+171 146 
+172 163 
+171 172 
+172 143 
+144 173 
+173 174 
+174 145 
+151 176 
+177 150 
+179 157 
+160 182 
+172 185 
+186 170 
+182 186 
+185 187 
+187 169 
+186 187 
+187 179 
+174 188 
+173 190 
+176 192 
+194 177 
+191 198 
+198 199 
+201 202 
+198 202 
+204 191 
+188 205 
+205 195 
+206 204 
+190 207 
+209 206 
+192 210 
+199 211 
+212 195 
+207 212 
+210 212 
+211 213 
+213 209 
+195 214 
+214 194 
+204 215 
+215 201 
+202 216 
+215 217 
+217 218 
+218 216 
+219 202 
+211 222 
+222 219 
+216 223 
+224 215 
+209 225 
+225 224 
+226 217 
+225 227 
+227 222 
+222 229 
+223 229 
+225 230 
+230 226 
+229 231 
+231 230 
+
+177 # number of geometric entity indices
+# Geometric entity indices
+83 
+83 
+81 
+63 
+76 
+78 
+63 
+65 
+82 
+82 
+80 
+80 
+81 
+64 
+76 
+77 
+72 
+67 
+56 
+66 
+59 
+56 
+79 
+61 
+61 
+74 
+62 
+74 
+75 
+58 
+58 
+59 
+71 
+60 
+71 
+72 
+73 
+57 
+70 
+66 
+54 
+79 
+68 
+66 
+79 
+54 
+68 
+66 
+79 
+54 
+69 
+55 
+68 
+55 
+66 
+52 
+69 
+55 
+55 
+54 
+69 
+55 
+69 
+55 
+68 
+69 
+53 
+48 
+52 
+50 
+50 
+54 
+55 
+48 
+50 
+48 
+49 
+7 
+6 
+50 
+50 
+50 
+50 
+51 
+48 
+48 
+49 
+6 
+7 
+43 
+41 
+18 
+39 
+40 
+21 
+23 
+4 
+2 
+40 
+35 
+42 
+7 
+7 
+42 
+46 
+6 
+6 
+43 
+47 
+18 
+17 
+17 
+35 
+22 
+23 
+16 
+19 
+21 
+6 
+5 
+7 
+2 
+4 
+37 
+38 
+20 
+22 
+38 
+20 
+34 
+36 
+37 
+3 
+1 
+2 
+4 
+33 
+28 
+32 
+45 
+33 
+3 
+3 
+15 
+1 
+15 
+2 
+28 
+0 
+1 
+2 
+14 
+14 
+4 
+4 
+31 
+32 
+44 
+29 
+30 
+30 
+27 
+26 
+27 
+25 
+13 
+11 
+13 
+10 
+12 
+12 
+24 
+25 
+8 
+10 
+9 
+9 
+
+# Type #2
+
+3 tri # type name
+
+
+3 # number of vertices per element
+510 # number of elements
+# Elements
+1 0 2 
+0 3 2 
+4 2 3 
+0 5 3 
+0 1 5 
+5 11 6 
+5 11 10 
+11 5 1 
+12 6 11 
+1 13 11 
+13 1 2 
+14 13 2 
+6 15 9 
+12 15 6 
+5 18 11 
+14 2 20 
+20 2 21 
+21 2 4 
+9 22 6 
+5 6 22 
+5 22 18 
+22 3 5 
+9 23 6 
+24 18 22 
+22 24 3 
+4 24 21 
+4 3 24 
+5 25 22 
+10 25 5 
+8 27 26 
+6 28 12 
+6 23 28 
+8 26 29 
+30 9 15 
+9 30 22 
+24 22 30 
+29 31 8 
+27 8 31 
+28 31 29 
+23 31 28 
+30 32 9 
+9 32 23 
+23 32 31 
+27 31 33 
+29 26 34 
+10 34 25 
+34 26 25 
+11 35 10 
+10 35 34 
+36 15 12 
+36 12 37 
+12 28 37 
+38 15 36 
+11 39 12 
+36 39 38 
+36 12 39 
+11 39 35 
+39 11 18 
+39 11 13 
+40 38 39 
+39 18 40 
+14 20 40 
+14 40 13 
+39 13 40 
+38 41 15 
+41 42 15 
+42 30 15 
+40 43 38 
+41 43 42 
+41 38 43 
+40 18 43 
+43 40 20 
+44 42 43 
+42 44 30 
+24 30 44 
+43 18 44 
+44 18 24 
+21 44 20 
+43 20 44 
+44 21 24 
+24 22 45 
+22 25 45 
+44 24 46 
+24 45 46 
+45 25 47 
+47 25 26 
+27 48 26 
+33 48 27 
+47 26 48 
+34 49 29 
+28 29 49 
+37 28 49 
+42 50 30 
+30 50 32 
+33 51 48 
+51 33 31 
+32 51 31 
+50 51 32 
+49 34 52 
+35 52 34 
+35 39 53 
+53 52 35 
+36 54 38 
+36 37 54 
+37 49 55 
+54 37 55 
+38 56 41 
+38 54 56 
+43 57 40 
+40 57 58 
+40 58 39 
+58 53 39 
+41 59 42 
+41 56 59 
+42 59 50 
+46 60 44 
+44 60 43 
+43 60 57 
+51 61 48 
+47 48 61 
+46 61 60 
+45 47 61 
+46 45 61 
+62 57 60 
+52 63 49 
+55 49 63 
+63 52 64 
+63 65 55 
+61 51 66 
+50 66 51 
+50 59 66 
+52 68 64 
+53 68 52 
+53 58 68 
+55 65 69 
+54 69 56 
+54 55 69 
+59 70 66 
+56 70 59 
+56 69 70 
+58 71 68 
+57 71 58 
+62 71 57 
+66 72 61 
+60 61 72 
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+62 72 73 
+73 71 62 
+64 74 63 
+65 63 74 
+67 65 74 
+74 64 75 
+67 74 76 
+64 77 75 
+77 64 68 
+67 78 65 
+65 78 69 
+72 66 80 
+80 66 70 
+70 79 80 
+81 75 77 
+76 82 67 
+67 82 78 
+83 77 68 
+71 83 68 
+84 69 78 
+69 84 70 
+79 70 84 
+83 71 85 
+73 85 71 
+86 79 84 
+80 87 72 
+85 73 87 
+73 72 87 
+88 85 87 
+89 74 75 
+89 76 74 
+89 75 90 
+91 75 81 
+90 75 91 
+92 76 89 
+93 82 76 
+76 92 93 
+81 77 94 
+94 77 83 
+95 78 82 
+78 95 84 
+96 84 95 
+86 84 96 
+79 86 97 
+87 80 98 
+98 80 79 
+97 98 79 
+99 81 94 
+91 81 99 
+100 95 82 
+82 93 100 
+94 83 101 
+101 83 85 
+102 86 96 
+103 101 85 
+88 103 85 
+102 104 86 
+97 86 104 
+98 105 87 
+88 105 103 
+88 87 105 
+89 90 106 
+92 89 106 
+91 99 107 
+106 90 108 
+91 107 108 
+90 91 108 
+92 106 109 
+109 93 92 
+93 109 110 
+110 100 93 
+111 94 101 
+94 111 99 
+112 96 95 
+95 100 112 
+113 102 96 
+96 112 113 
+114 105 98 
+97 114 98 
+104 114 97 
+99 115 107 
+115 99 111 
+100 110 116 
+116 112 100 
+117 101 103 
+117 111 101 
+118 104 102 
+102 113 118 
+111 119 115 
+117 119 111 
+120 103 105 
+120 117 103 
+121 114 104 
+121 104 118 
+114 122 105 
+122 120 105 
+106 123 109 
+106 108 123 
+115 124 107 
+108 107 125 
+107 124 125 
+123 108 125 
+116 110 126 
+109 123 126 
+110 109 126 
+116 126 127 
+112 116 127 
+127 113 112 
+113 127 128 
+128 118 113 
+118 128 129 
+121 118 129 
+114 130 122 
+121 130 114 
+121 129 130 
+119 131 115 
+124 115 131 
+119 132 131 
+117 132 119 
+120 132 117 
+130 133 122 
+132 120 133 
+122 133 120 
+125 135 123 
+134 135 125 
+135 136 123 
+126 123 136 
+140 141 143 
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+140 143 138 
+140 143 144 
+138 139 145 
+138 145 146 
+146 138 143 
+125 147 134 
+124 147 125 
+147 124 131 
+128 148 129 
+136 148 126 
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+127 126 148 
+131 149 147 
+130 150 133 
+130 129 150 
+150 129 148 
+150 151 133 
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+132 151 131 
+149 131 151 
+152 148 136 
+140 144 155 
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+145 139 156 
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+153 162 142 
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+163 137 162 
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+160 139 165 
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+146 165 138 
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+155 167 140 
+143 140 167 
+169 164 162 
+169 162 154 
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+147 149 175 
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+176 151 177 
+148 177 150 
+152 177 148 
+178 152 161 
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+179 167 157 
+154 179 169 
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+157 179 153 
+157 160 179 
+180 161 156 
+160 180 156 
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+181 158 175 
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+180 183 161 
+183 178 161 
+184 181 175 
+172 163 185 
+164 185 163 
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+172 185 171 
+170 171 185 
+185 172 167 
+170 185 186 
+186 165 170 
+186 182 165 
+182 186 179 
+187 185 169 
+187 186 185 
+185 167 187 
+187 167 179 
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+171 174 188 
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+189 170 188 
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+176 177 192 
+192 175 176 
+184 175 192 
+192 177 194 
+178 194 177 
+178 183 194 
+186 196 182 
+196 180 182 
+186 189 196 
+180 196 183 
+191 183 196 
+187 179 197 
+184 197 181 
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+198 183 191 
+198 191 193 
+198 199 183 
+183 199 194 
+199 198 193 
+200 184 192 
+201 197 184 
+191 198 201 
+202 184 200 
+201 184 202 
+202 201 198 
+203 190 185 
+185 187 203 
+187 197 203 
+204 191 196 
+204 196 189 
+191 204 193 
+191 201 204 
+188 190 205 
+189 188 205 
+189 205 206 
+206 204 189 
+206 193 204 
+207 205 190 
+205 207 195 
+203 207 190 
+209 205 195 
+209 206 205 
+209 193 206 
+194 210 192 
+200 192 210 
+211 199 193 
+212 195 207 
+213 209 195 
+213 193 209 
+211 193 213 
+214 210 194 
+195 212 214 
+210 214 212 
+211 213 214 
+213 195 214 
+211 214 199 
+214 194 199 
+215 197 201 
+215 203 197 
+215 204 201 
+202 216 201 
+215 201 217 
+218 201 216 
+218 217 201 
+219 202 200 
+219 200 210 
+202 219 216 
+202 198 219 
+199 219 198 
+199 211 219 
+202 220 201 
+201 220 215 
+219 220 202 
+222 219 210 
+222 220 219 
+222 219 211 
+223 216 219 
+224 203 215 
+203 224 207 
+215 217 224 
+215 224 204 
+206 224 209 
+206 204 224 
+224 215 220 
+225 212 207 
+225 207 224 
+225 209 224 
+224 220 225 
+226 224 217 
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+222 210 227 
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+227 225 220 
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+216 228 218 
+218 228 217 
+226 217 228 
+223 228 216 
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+229 228 223 
+222 229 219 
+223 219 229 
+225 230 227 
+226 230 224 
+225 224 230 
+230 226 228 
+231 227 230 
+231 229 227 
+231 230 228 
+229 231 228 
+
+510 # number of geometric entity indices
+# Geometric entity indices
+42 
+42 
+42 
+41 
+41 
+35 
+36 
+41 
+35 
+40 
+42 
+42 
+31 
+31 
+37 
+42 
+42 
+42 
+35 
+35 
+37 
+41 
+29 
+37 
+39 
+39 
+39 
+36 
+36 
+30 
+29 
+29 
+4 
+31 
+33 
+33 
+29 
+29 
+29 
+29 
+29 
+29 
+29 
+29 
+4 
+36 
+36 
+36 
+36 
+31 
+29 
+29 
+31 
+34 
+34 
+34 
+36 
+37 
+40 
+34 
+37 
+38 
+40 
+40 
+31 
+31 
+31 
+32 
+32 
+32 
+37 
+38 
+32 
+33 
+33 
+37 
+37 
+38 
+38 
+39 
+36 
+36 
+36 
+36 
+36 
+36 
+30 
+30 
+36 
+4 
+29 
+29 
+29 
+29 
+1 
+29 
+29 
+29 
+4 
+36 
+36 
+36 
+29 
+29 
+29 
+29 
+29 
+29 
+36 
+36 
+36 
+36 
+29 
+29 
+29 
+36 
+36 
+36 
+1 
+36 
+36 
+36 
+36 
+36 
+4 
+29 
+4 
+29 
+1 
+29 
+29 
+36 
+36 
+36 
+29 
+29 
+29 
+29 
+29 
+29 
+36 
+36 
+36 
+1 
+36 
+36 
+36 
+36 
+4 
+29 
+29 
+4 
+29 
+36 
+36 
+29 
+29 
+1 
+29 
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+36 
+29 
+29 
+36 
+36 
+29 
+29 
+29 
+36 
+36 
+29 
+1 
+36 
+36 
+36 
+4 
+29 
+4 
+27 
+27 
+28 
+28 
+28 
+36 
+36 
+29 
+29 
+29 
+29 
+29 
+1 
+29 
+29 
+27 
+27 
+28 
+28 
+36 
+36 
+29 
+36 
+36 
+29 
+29 
+1 
+36 
+36 
+4 
+28 
+27 
+4 
+27 
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+28 
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+1 
+29 
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+27 
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+27 
+27 
+27 
+27 
+28 
+28 
+1 
+27 
+3 
+4 
+2 
+2 
+2 
+4 
+3 
+3 
+3 
+3 
+28 
+28 
+28 
+28 
+28 
+28 
+1 
+28 
+28 
+2 
+2 
+2 
+27 
+27 
+1 
+27 
+27 
+4 
+4 
+3 
+3 
+13 
+13 
+16 
+2 
+3 
+3 
+16 
+2 
+2 
+2 
+3 
+3 
+3 
+3 
+2 
+1 
+3 
+3 
+1 
+2 
+2 
+2 
+3 
+2 
+25 
+25 
+25 
+26 
+26 
+3 
+4 
+25 
+2 
+2 
+2 
+4 
+4 
+4 
+3 
+26 
+26 
+3 
+3 
+3 
+14 
+14 
+14 
+14 
+13 
+14 
+14 
+18 
+18 
+18 
+17 
+17 
+17 
+14 
+14 
+16 
+18 
+18 
+13 
+16 
+17 
+2 
+2 
+4 
+3 
+3 
+4 
+2 
+2 
+2 
+2 
+1 
+1 
+3 
+3 
+3 
+3 
+17 
+23 
+23 
+23 
+24 
+3 
+3 
+2 
+2 
+2 
+2 
+2 
+3 
+18 
+24 
+3 
+3 
+2 
+12 
+12 
+12 
+15 
+15 
+17 
+15 
+18 
+18 
+24 
+12 
+15 
+17 
+17 
+23 
+24 
+3 
+3 
+3 
+3 
+0 
+0 
+2 
+2 
+1 
+2 
+2 
+1 
+3 
+3 
+3 
+3 
+3 
+3 
+3 
+2 
+2 
+2 
+3 
+11 
+3 
+3 
+11 
+2 
+2 
+22 
+2 
+2 
+22 
+2 
+2 
+2 
+3 
+3 
+11 
+22 
+0 
+3 
+3 
+3 
+11 
+0 
+0 
+2 
+3 
+3 
+11 
+1 
+2 
+11 
+0 
+3 
+11 
+11 
+1 
+1 
+1 
+3 
+3 
+3 
+3 
+2 
+2 
+22 
+21 
+21 
+21 
+21 
+2 
+2 
+19 
+20 
+20 
+20 
+10 
+10 
+10 
+2 
+10 
+20 
+19 
+2 
+2 
+6 
+9 
+9 
+9 
+10 
+2 
+2 
+9 
+10 
+6 
+2 
+2 
+2 
+8 
+8 
+8 
+8 
+10 
+10 
+7 
+7 
+7 
+7 
+5 
+7 
+19 
+19 
+5 
+6 
+6 
+7 
+5 
+5 
+7 
+7 
+
+# Type #3
+
+3 tet # type name
+
+
+4 # number of vertices per element
+638 # number of elements
+# Elements
+0 3 5 2 
+0 1 2 5 
+5 11 6 10 
+11 1 5 2 
+12 11 10 6 
+7 9 6 15 
+12 6 15 11 
+5 6 11 15 
+7 6 5 15 
+16 14 13 2 
+13 1 11 16 
+16 13 1 2 
+16 1 11 2 
+18 5 11 15 
+7 18 15 5 
+18 5 2 11 
+16 18 2 11 
+19 7 18 15 
+17 19 18 15 
+16 14 2 20 
+16 2 18 20 
+2 20 21 18 
+5 22 6 7 
+9 7 6 22 
+7 22 18 5 
+18 5 22 2 
+22 3 2 5 
+6 5 10 23 
+9 23 22 6 
+5 6 22 23 
+7 22 24 18 
+7 19 18 24 
+22 3 24 2 
+4 21 24 2 
+18 24 2 22 
+4 3 2 24 
+18 2 24 21 
+5 23 25 10 
+22 23 25 5 
+6 10 28 23 
+6 10 12 28 
+10 28 23 25 
+7 9 15 30 
+7 19 30 15 
+7 9 30 22 
+7 24 22 30 
+7 19 24 30 
+8 26 31 29 
+8 26 27 31 
+25 23 31 28 
+9 30 22 32 
+24 30 32 22 
+9 23 32 22 
+29 28 34 31 
+28 10 34 25 
+25 28 31 34 
+29 34 26 31 
+25 31 26 34 
+10 28 34 35 
+11 12 10 35 
+10 12 28 35 
+37 35 28 12 
+11 39 12 35 
+36 12 39 37 
+37 35 12 39 
+11 12 39 15 
+17 18 39 15 
+18 39 15 11 
+36 12 15 39 
+36 38 39 15 
+17 38 15 39 
+39 16 13 11 
+16 39 18 11 
+17 40 39 18 
+40 17 39 38 
+16 39 13 40 
+16 14 40 13 
+16 39 40 18 
+14 16 40 20 
+17 41 15 38 
+17 19 15 41 
+19 42 30 15 
+19 42 15 41 
+19 41 43 42 
+17 19 41 43 
+17 43 40 18 
+17 40 43 38 
+17 41 38 43 
+17 19 43 18 
+16 40 43 18 
+40 43 20 16 
+16 43 20 18 
+19 42 44 30 
+19 44 42 43 
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+
+638 # number of geometric entity indices
+# Geometric entity indices
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+
+# --------- Object 1 ----------
+
+0 0 1 
+9 Selection # class
+0 # Version
+8 Ti Bolts # Label
+5 mesh1 # Geometry/mesh tag
+3 # Dimension
+6 # Number of entities
+# Entities
+2 
+3 
+4 
+5 
+6 
+7 
+
+# --------- Object 2 ----------
+
+0 0 1 
+9 Selection # class
+0 # Version
+12 Copper Piece # Label
+5 mesh1 # Geometry/mesh tag
+3 # Dimension
+1 # Number of entities
+# Entities
+1 
+
+# --------- Object 3 ----------
+
+0 0 1 
+9 Selection # class
+0 # Version
+11 Single Bolt # Label
+5 mesh1 # Geometry/mesh tag
+3 # Dimension
+2 # Number of entities
+# Entities
+2 
+3 
diff --git a/tests/grid/grids/comsol/mesh_example_intro.mphtxt b/tests/grid/grids/comsol/mesh_example_intro.mphtxt
new file mode 100644
index 0000000000..d6065e6a1d
--- /dev/null
+++ b/tests/grid/grids/comsol/mesh_example_intro.mphtxt
@@ -0,0 +1,215 @@
+# Created by COMSOL Multiphysics.
+
+# Major & minor version
+0 1 
+1 # number of tags
+# Tags
+5 mesh1 
+1 # number of types
+# Types
+3 obj 
+
+# --------- Object 0 ----------
+
+0 0 1 
+4 Mesh # class
+4 # version
+3 # sdim
+12 # number of mesh vertices
+0 # lowest mesh vertex index
+
+# Mesh vertex coordinates
+0 0 0 
+0 0 1 
+0 1 1 
+1 0 1 
+0 1 0 
+1 0 0 
+1 1 1 
+2 0 1 
+1 1 0 
+2 0 0 
+2 1 1 
+2 1 0 
+
+6 # number of element types
+
+# Type #0
+
+3 tet # type name
+
+
+4 # number of vertices per element
+5 # number of elements
+# Elements
+0 5 4 1 
+2 4 6 1 
+5 4 1 6 
+3 5 1 6 
+8 5 6 4 
+
+5 # number of geometric entity indices
+# Geometric entity indices
+1 
+1 
+1 
+1 
+2 
+
+# Type #1
+
+5 prism # type name
+
+
+6 # number of vertices per element
+2 # number of elements
+# Elements
+3 5 6 7 9 10 
+8 6 5 11 10 9 
+
+2 # number of geometric entity indices
+# Geometric entity indices
+1 
+2 
+
+# Type #2
+
+3 vtx # type name
+
+
+1 # number of vertices per element
+10 # number of elements
+# Elements
+0 
+1 
+2 
+4 
+5 
+6 
+7 
+9 
+10 
+11 
+
+10 # number of geometric entity indices
+# Geometric entity indices
+0 
+1 
+3 
+2 
+4 
+5 
+7 
+6 
+9 
+8 
+
+# Type #3
+
+3 edg # type name
+
+
+2 # number of vertices per element
+19 # number of elements
+# Elements
+0 1 
+1 2 
+1 3 
+0 4 
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+4 5 
+4 6 
+2 6 
+3 7 
+4 8 
+9 7 
+5 9 
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+7 10 
+6 10 
+8 11 
+11 10 
+9 11 
+
+19 # number of geometric entity indices
+# Geometric entity indices
+0 
+3 
+4 
+1 
+5 
+2 
+6 
+7 
+9 
+4 
+8 
+12 
+10 
+14 
+15 
+11 
+8 
+16 
+13 
+
+# Type #4
+
+3 tri # type name
+
+
+3 # number of vertices per element
+13 # number of elements
+# Elements
+0 1 4 
+2 4 1 
+0 5 1 
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+2 1 6 
+3 6 1 
+5 6 4 
+8 5 4 
+8 4 6 
+7 9 10 
+11 10 9 
+
+13 # number of geometric entity indices
+# Geometric entity indices
+0 
+0 
+1 
+2 
+1 
+4 
+3 
+3 
+5 
+6 
+7 
+8 
+9 
+
+# Type #5
+
+4 quad # type name
+
+
+4 # number of vertices per element
+5 # number of elements
+# Elements
+5 9 3 7 
+3 7 6 10 
+5 9 6 10 
+5 8 9 11 
+8 6 11 10 
+
+5 # number of geometric entity indices
+# Geometric entity indices
+1 
+3 
+5 
+6 
+7 
diff --git a/tests/grid/grids/comsol/mesh_example_with_complete_geom_info.mphtxt b/tests/grid/grids/comsol/mesh_example_with_complete_geom_info.mphtxt
new file mode 100644
index 0000000000..c6c8c69cda
--- /dev/null
+++ b/tests/grid/grids/comsol/mesh_example_with_complete_geom_info.mphtxt
@@ -0,0 +1,221 @@
+# Created by COMSOL Multiphysics.
+
+# Major & minor version
+0 1 
+1 # number of tags
+# Tags
+5 mesh2 
+1 # number of types
+# Types
+3 obj 
+
+# --------- Object 0 ----------
+
+0 0 1 
+4 Mesh # class
+4 # version
+3 # sdim
+12 # number of mesh vertices
+0 # lowest mesh vertex index
+
+# Mesh vertex coordinates
+0 1 1 
+0 0 1 
+0 0 0 
+1 0 1 
+0 1 0 
+1 1 1 
+1 0 0 
+2 0 1 
+1 1 0 
+2 1 1 
+2 0 0 
+2 1 0 
+
+6 # number of element types
+
+# Type #0
+
+3 tet # type name
+
+
+4 # number of vertices per element
+5 # number of elements
+# Elements
+2 4 1 6 
+4 0 1 5 
+1 6 4 5 
+1 3 6 5 
+6 8 4 5 
+
+5 # number of geometric entity indices
+# Geometric entity indices
+1 
+1 
+1 
+1 
+1 
+
+# Type #1
+
+5 prism # type name
+
+
+6 # number of vertices per element
+2 # number of elements
+# Elements
+5 3 6 9 7 10 
+6 8 5 10 11 9 
+
+2 # number of geometric entity indices
+# Geometric entity indices
+2 
+2 
+
+# Type #2
+
+3 vtx # type name
+
+
+1 # number of vertices per element
+12 # number of elements
+# Elements
+0 
+1 
+2 
+3 
+4 
+5 
+6 
+7 
+8 
+9 
+10 
+11 
+
+12 # number of geometric entity indices
+# Geometric entity indices
+3 
+1 
+0 
+5 
+2 
+7 
+4 
+9 
+6 
+11 
+8 
+10 
+
+# Type #3
+
+3 edg # type name
+
+
+2 # number of vertices per element
+20 # number of elements
+# Elements
+10 7 
+7 9 
+11 9 
+10 11 
+6 3 
+3 5 
+8 5 
+6 8 
+4 0 
+0 5 
+4 8 
+2 4 
+2 6 
+1 0 
+1 3 
+2 1 
+5 9 
+8 11 
+6 10 
+3 7 
+
+20 # number of geometric entity indices
+# Geometric entity indices
+16 
+18 
+19 
+17 
+8 
+11 
+13 
+9 
+5 
+7 
+6 
+1 
+2 
+3 
+4 
+0 
+15 
+14 
+10 
+12 
+
+# Type #4
+
+3 tri # type name
+
+
+3 # number of vertices per element
+14 # number of elements
+# Elements
+2 1 4 
+2 6 1 
+2 4 6 
+4 1 0 
+4 0 5 
+0 1 5 
+1 6 3 
+1 3 5 
+6 4 8 
+8 4 5 
+5 6 3 
+9 7 10 
+6 5 8 
+10 11 9 
+
+14 # number of geometric entity indices
+# Geometric entity indices
+0 
+1 
+2 
+0 
+4 
+3 
+1 
+3 
+2 
+4 
+5 
+10 
+5 
+10 
+
+# Type #5
+
+4 quad # type name
+
+
+4 # number of vertices per element
+4 # number of elements
+# Elements
+5 3 9 7 
+3 6 7 10 
+6 8 10 11 
+8 5 11 9 
+
+4 # number of geometric entity indices
+# Geometric entity indices
+8 
+6 
+7 
+9 
diff --git a/tests/grid/grids/comsol/mesh_example_with_domain_geom_info.mphtxt b/tests/grid/grids/comsol/mesh_example_with_domain_geom_info.mphtxt
new file mode 100644
index 0000000000..471bf86205
--- /dev/null
+++ b/tests/grid/grids/comsol/mesh_example_with_domain_geom_info.mphtxt
@@ -0,0 +1,73 @@
+# Created by COMSOL Multiphysics.
+
+# Major & minor version
+0 1 
+1 # number of tags
+# Tags
+5 mesh4 
+1 # number of types
+# Types
+3 obj 
+
+# --------- Object 0 ----------
+
+0 0 1 
+4 Mesh # class
+4 # version
+3 # sdim
+12 # number of mesh vertices
+0 # lowest mesh vertex index
+
+# Mesh vertex coordinates
+0 1 1 
+0 0 1 
+0 0 0 
+1 0 1 
+0 1 0 
+1 1 1 
+1 0 0 
+2 0 1 
+1 1 0 
+2 1 1 
+2 0 0 
+2 1 0 
+
+2 # number of element types
+
+# Type #0
+
+3 tet # type name
+
+
+4 # number of vertices per element
+5 # number of elements
+# Elements
+2 4 1 6 
+4 0 1 5 
+1 6 4 5 
+1 3 6 5 
+6 8 4 5 
+
+5 # number of geometric entity indices
+# Geometric entity indices
+1 
+1 
+1 
+1 
+1 
+
+# Type #1
+
+5 prism # type name
+
+
+6 # number of vertices per element
+2 # number of elements
+# Elements
+5 3 6 9 7 10 
+6 8 5 10 11 9 
+
+2 # number of geometric entity indices
+# Geometric entity indices
+2 
+2 
diff --git a/tests/grid/grids/comsol/mesh_example_with_domain_geom_info_1_7.mphtxt b/tests/grid/grids/comsol/mesh_example_with_domain_geom_info_1_7.mphtxt
new file mode 100644
index 0000000000..22df34044b
--- /dev/null
+++ b/tests/grid/grids/comsol/mesh_example_with_domain_geom_info_1_7.mphtxt
@@ -0,0 +1,73 @@
+# Created by COMSOL Multiphysics.
+
+# Major & minor version
+0 1 
+1 # number of tags
+# Tags
+5 mesh6 
+1 # number of types
+# Types
+3 obj 
+
+# --------- Object 0 ----------
+
+0 0 1 
+4 Mesh # class
+4 # version
+3 # sdim
+12 # number of mesh vertices
+0 # lowest mesh vertex index
+
+# Mesh vertex coordinates
+0 0 0 
+0 0 1 
+0 1 1 
+1 0 1 
+0 1 0 
+1 0 0 
+1 1 1 
+2 0 1 
+1 1 0 
+2 0 0 
+2 1 1 
+2 1 0 
+
+2 # number of element types
+
+# Type #0
+
+3 tet # type name
+
+
+4 # number of vertices per element
+5 # number of elements
+# Elements
+2 4 1 6 
+4 0 1 5 
+1 6 4 5 
+1 3 6 5 
+6 8 4 5 
+
+5 # number of geometric entity indices
+# Geometric entity indices
+1 
+2 
+3 
+4 
+5 
+
+# Type #1
+
+5 prism # type name
+
+
+6 # number of vertices per element
+2 # number of elements
+# Elements
+5 3 6 9 7 10 
+6 8 5 10 11 9 
+
+2 # number of geometric entity indices
+# Geometric entity indices
+6 
+7
\ No newline at end of file
diff --git a/tests/grid/grids/comsol/mesh_example_without_domain_geom_info.mphtxt b/tests/grid/grids/comsol/mesh_example_without_domain_geom_info.mphtxt
new file mode 100644
index 0000000000..03113d5156
--- /dev/null
+++ b/tests/grid/grids/comsol/mesh_example_without_domain_geom_info.mphtxt
@@ -0,0 +1,64 @@
+# Created by COMSOL Multiphysics.
+
+# Major & minor version
+0 1 
+1 # number of tags
+# Tags
+5 mesh1 
+1 # number of types
+# Types
+3 obj 
+
+# --------- Object 0 ----------
+
+0 0 1 
+4 Mesh # class
+4 # version
+3 # sdim
+12 # number of mesh vertices
+0 # lowest mesh vertex index
+
+# Mesh vertex coordinates
+0 0 0 
+0 0 1 
+0 1 1 
+1 0 1 
+0 1 0 
+1 0 0 
+1 1 1 
+2 0 1 
+1 1 0 
+2 0 0 
+2 1 1 
+2 1 0 
+
+2 # number of element types
+
+# Type #0
+
+3 tet # type name
+
+
+4 # number of vertices per element
+5 # number of elements
+# Elements
+0 5 4 1 
+2 4 6 1 
+5 4 1 6 
+3 5 1 6 
+8 5 6 4 
+
+0 # number of geometric entity indices
+
+# Type #1
+
+5 prism # type name
+
+
+6 # number of vertices per element
+2 # number of elements
+# Elements
+3 5 6 7 9 10 
+8 6 5 11 10 9 
+
+0 # number of geometric entity indices
-- 
2.39.5