diff --git a/test/DFSTest.cpp b/test/DFSTest.cpp
index 795c75253..388b9ff2b 100644
--- a/test/DFSTest.cpp
+++ b/test/DFSTest.cpp
@@ -139,3 +139,61 @@ TEST(DFSTest, test_6) {
   ASSERT_FALSE(std::find(res.begin(), res.end(), node3) != res.end());
   ASSERT_FALSE(std::find(res.begin(), res.end(), node4) != res.end());
 }
+
+TEST(DFSTest, test_7) {
+  CXXGraph::Node<int> node1("1", 1);
+  CXXGraph::Node<int> node2("2", 2);
+  CXXGraph::Node<int> node3("3", 3);
+  CXXGraph::Node<int> node4("4", 4);
+  std::pair<const CXXGraph::Node<int> *, const CXXGraph::Node<int> *> pairNode(
+      &node1, &node2);
+  CXXGraph::DirectedWeightedEdge<int> edge1(1, pairNode, 1);
+  CXXGraph::DirectedWeightedEdge<int> edge2(2, node2, node3, 1);
+  CXXGraph::DirectedWeightedEdge<int> edge3(3, node3, node4, 1);
+  CXXGraph::DirectedWeightedEdge<int> edge4(4, node4, node1, 1);
+  CXXGraph::T_EdgeSet<int> edgeSet;
+  edgeSet.insert(make_shared<CXXGraph::DirectedWeightedEdge<int>>(edge1));
+  edgeSet.insert(make_shared<CXXGraph::DirectedWeightedEdge<int>>(edge2));
+  edgeSet.insert(make_shared<CXXGraph::DirectedWeightedEdge<int>>(edge3));
+  edgeSet.insert(make_shared<CXXGraph::DirectedWeightedEdge<int>>(edge4));
+  CXXGraph::Graph<int> graph(edgeSet);
+  std::vector<CXXGraph::Node<int>> res = graph.depth_first_search(node1);
+  ASSERT_EQ(res.size(), 4);
+  ASSERT_TRUE(std::find(res.begin(), res.end(), node1) != res.end());
+  ASSERT_TRUE(std::find(res.begin(), res.end(), node2) != res.end());
+  ASSERT_TRUE(std::find(res.begin(), res.end(), node3) != res.end());
+  ASSERT_TRUE(std::find(res.begin(), res.end(), node4) != res.end());
+}
+
+TEST(DFSTest, test_8) {
+  CXXGraph::Node<int> node1("1", 1);
+  CXXGraph::Node<int> node2("2", 2);
+  CXXGraph::Node<int> node3("3", 3);
+  CXXGraph::Node<int> node4("4", 4);
+
+  CXXGraph::DirectedWeightedEdge<int> edge1(1, node1, node2, 1);
+  CXXGraph::DirectedWeightedEdge<int> edge2(2, node3, node4, 1);
+  CXXGraph::T_EdgeSet<int> edgeSet;
+  edgeSet.insert(make_shared<CXXGraph::DirectedWeightedEdge<int>>(edge1));
+  edgeSet.insert(make_shared<CXXGraph::DirectedWeightedEdge<int>>(edge2));
+  CXXGraph::Graph<int> graph(edgeSet);
+  std::vector<CXXGraph::Node<int>> res = graph.depth_first_search(node1);
+  ASSERT_EQ(res.size(), 2);
+  ASSERT_TRUE(std::find(res.begin(), res.end(), node1) != res.end());
+  ASSERT_TRUE(std::find(res.begin(), res.end(), node2) != res.end());
+  ASSERT_FALSE(std::find(res.begin(), res.end(), node3) != res.end());
+  ASSERT_FALSE(std::find(res.begin(), res.end(), node4) != res.end());
+}
+
+TEST(DFSTest, test_9) {
+  CXXGraph::Node<int> node1("1", 1);
+  std::pair<const CXXGraph::Node<int> *, const CXXGraph::Node<int> *> pairNode(
+      &node1, &node1);
+  CXXGraph::UndirectedWeightedEdge<int> edge1(1, pairNode, 1);
+  CXXGraph::T_EdgeSet<int> edgeSet;
+  edgeSet.insert(make_shared<CXXGraph::DirectedWeightedEdge<int>>(edge1));
+  CXXGraph::Graph<int> graph(edgeSet);
+  std::vector<CXXGraph::Node<int>> res = graph.depth_first_search(node1);
+  ASSERT_EQ(res.size(), 1);
+  ASSERT_TRUE(std::find(res.begin(), res.end(), node1) != res.end());
+}