diff --git a/graph/graph.h b/graph/graph.h
index 7e2bae6..f688e96 100644
--- a/graph/graph.h
+++ b/graph/graph.h
@@ -45,6 +45,7 @@ Graph<T>::~Graph() {
 template<typename T>
 inline void Graph<T>::insert(const T& u, const T& v) {
   Graph<T>::adjMatrix[u].insert(v);
+  Graph<T>::adjMatrix[v];
 }
 
 template<typename T>
diff --git a/test/graph_test.cc b/test/graph_test.cc
index 8365ea7..e6d957d 100644
--- a/test/graph_test.cc
+++ b/test/graph_test.cc
@@ -45,13 +45,13 @@ TEST_SUITE("Graph") {
     CHECK_EQ(R, X);
   }
 
-  TEST_CASE("Digraph::V and Digraph::E") {
+  TEST_CASE("Graph::V and Graph::E") {
     // 1 --> 2 --> 3 --> 1
     //             3 --> 4 --> 5 --> 3
     //       2 --> 6 --> 7 --> 8 --> 6
     //             6 --> 9 --> 10 --> 11 --> 12 --> 13 --> 9
     //                                       12 --> 10
-    Digraph<std::uint16_t> G;
+    Graph<std::uint16_t> G;
     G.insert(1, 2);
     G.insert(2, 3);
     G.insert(3, 1);