Finish GoS computation test

tests/morpho/mtos.cpp

@@ -17,6 +17,39 @@ TEST(Morpho, GoS)
       {{255, 75, 0}, {31, 174, 0}, {255, 75, 0}, {31, 174, 0}, {255, 146, 0}}, //
   };
 
+  std::vector<std::set<int>> graph_ref = {             //
+                                          {},          // 0
+                                          {0},         // 1
+                                          {0, 1},      // 2
+                                          {0, 1, 14},  // 3
+                                          {0, 1, 20},  // 4
+                                          {0, 1, 24},  // 5
+                                          {0, 1, 14},  // 6
+                                          {0, 1, 14},  // 7
+                                          {0, 7, 19},  // 8
+                                          {0, 1, 22},  // 9
+                                          {0, 14},     // 10
+                                          {0, 10, 14}, // 11
+                                          {0, 11, 15}, // 12
+                                          {0, 16},     // 13
+                                          {0},         // 14
+                                          {0, 10, 14}, // 15
+                                          {0, 14},     // 16
+                                          {0, 16, 29}, // 17
+                                          {0, 16},     // 18
+                                          {0, 1, 14},  // 19
+                                          {0, 1, 14},  // 20
+                                          {0, 7, 14},  // 21
+                                          {0, 1, 14},  // 22
+                                          {0, 7, 22},     // 23
+                                          {0, 1, 14},  // 24
+                                          {6, 24, 28}, // 25
+                                          {0, 10, 15}, // 26
+                                          {0, 1, 20},  // 27
+                                          {0, 1, 14},  // 28
+                                          {0, 14},     // 29
+                                          {0, 1, 19}};
+
   std::vector<std::vector<int>> tree_to_graph_ref = {{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13},
                                                      {0, 2, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25},
                                                      {0, 26, 27, 28, 29, 30}};
@@ -35,6 +68,13 @@ TEST(Morpho, GoS)
 
   // Check number of nodes in the GoS
   ASSERT_EQ(graph.size(), 31);
+  for (int i = 0; i < (int)graph.size(); i++)
+  {
+      ASSERT_EQ(graph[i].size(), graph_ref[i].size());
+      auto ref_it = graph_ref[i].begin();
+      for (auto it = graph[i].begin(); it != graph[i].end(); it++)
+        ASSERT_EQ(*ref_it++, *it);
+  }
 
   // Compare the map tree node -> graph node
   for (int i = 0; i < 3; i++)