Add test of set data for isolated node

test/GraphTest.cpp

@@ -821,3 +821,56 @@ TEST(TestGetNode, Test_1) {
   auto node_notfound = graph.getNode("5");
   ASSERT_FALSE(node_notfound.has_value());
 }
+
+TEST(GraphTest, set_data_isolated) {
+  // Create the graph
+  CXXGraph::Node<int> node1("1", 1);
+  CXXGraph::Node<int> node2("2", 2);
+  CXXGraph::Node<int> node3("3", 3);
+  std::pair<const CXXGraph::Node<int> *, const CXXGraph::Node<int> *> pairNode(
+      &node1, &node2);
+  CXXGraph::DirectedEdge<int> edge1(1, pairNode);
+  CXXGraph::DirectedEdge<int> edge2(2, node2, node3);
+  CXXGraph::UndirectedEdge<int> edge3(3, node1, node3);
+  CXXGraph::T_EdgeSet<int> edgeSet;
+  edgeSet.insert(make_shared<CXXGraph::DirectedEdge<int>>(edge1));
+  edgeSet.insert(make_shared<CXXGraph::DirectedEdge<int>>(edge2));
+  edgeSet.insert(make_shared<CXXGraph::UndirectedEdge<int>>(edge3));
+  CXXGraph::Graph<int> graph(edgeSet);
+
+  // Create isolated nodes and add them to the graph
+  CXXGraph::Node<int> node4("4", 4);
+  CXXGraph::Node<int> node5("5", 5);
+  CXXGraph::Node<int> node6("6", 6);
+  graph.addNode(make_shared<CXXGraph::Node<int>>(node4));
+  graph.addNode(make_shared<CXXGraph::Node<int>>(node5));
+  graph.addNode(make_shared<CXXGraph::Node<int>>(node6));
+
+  std::map<std::string, int> initial_values;
+  // Construct map with the initial values of the nodes data
+  for (const auto &nodeIt : graph.getNodeSet()) {
+    initial_values[nodeIt->getUserId()] = nodeIt->getData();
+  }
+  // Change the data contained in the nodes singularly
+  std::map<std::string, int> new_values;
+  for (const auto &nodeIt : graph.getNodeSet()) {
+    int r = std::rand();
+    graph.setNodeData(nodeIt->getUserId(), r);
+    new_values[nodeIt->getUserId()] = r;
+  }
+  // Check the final values of the node data
+  for (const auto &nodeIt : graph.getNodeSet()) {
+    ASSERT_EQ(nodeIt->getData(), new_values[nodeIt->getUserId()]);
+  }
+
+  // Now set the data of all the nodes at once
+  std::map<std::string, int> data_values;
+  for (const auto &nodeIt : graph.getNodeSet()) {
+    int r = std::rand();
+    data_values[nodeIt->getUserId()] = r;
+  }
+  graph.setNodeData(data_values);
+  for (const auto &nodeIt : graph.getNodeSet()) {
+    ASSERT_EQ(nodeIt->getData(), data_values[nodeIt->getUserId()]);
+  }
+}