public void testCopyElementProperties() {
Graph graph = new TinkerGraph();
Vertex v = graph.addVertex(null);
v.setProperty("name", "marko");
v.setProperty("age", 31);
Vertex u = graph.addVertex(null);
assertEquals(u.getPropertyKeys().size(), 0);
ElementHelper.copyProperties(v, u);
assertEquals(u.getPropertyKeys().size(), 2);
assertEquals(u.getProperty("name"), "marko");
assertEquals(u.getProperty("age"), 31);