@Test
 public void testToString$baseAsResource() throws Exception {
   System.out.println(
       "Base as resource: " + sut.toString(vf.createURI(BASE.substring(0, BASE.length() - 1))));
 }
 @Test
 public void testToString$sameAsBase() throws Exception {
   System.out.println("Same as base: " + sut.toString(vf.createURI(BASE)));
 }
 @Test
 public void testToString$ancestor() throws Exception {
   System.out.println("Ancestor: " + sut.toString(vf.createURI(BASE + "..")));
 }
 @Test
 public void testToString$self() throws Exception {
   System.out.println("Self: " + sut.toString(vf.createURI(BASE.concat("."))));
 }
 @Test
 public void testToString$child() throws Exception {
   System.out.println("Child: " + sut.toString(vf.createURI(BASE + "child")));
 }