@Test
 public void generateExamplePoITest() {
   assertEquals(10, graphExamplePoI.getNumberOfNodes());
   assertEquals(13, graphExamplePoI.getNumberOfEdges());
 }
 @Test
 public void generateAndorraTest() {
   assertEquals(2621, graphAndorra.getNumberOfNodes());
   assertEquals(5326, graphAndorra.getNumberOfEdges());
 }
 @Test
 public void generateExample3Test() {
   assertEquals(6, graphExample3.getNumberOfNodes());
   assertEquals(7, graphExample3.getNumberOfEdges());
 }