public void testSeDurationBeforeEnd_RI2() {
   MutableInterval test = new MutableInterval(TEST_TIME1, TEST_TIME2);
   try {
     test.setDurationBeforeEnd(new Duration(-1));
     fail();
   } catch (IllegalArgumentException ex) {
   }
 }
 public void testSetDurationBeforeEnd_RI3() {
   MutableInterval test = new MutableInterval(TEST_TIME1, TEST_TIME2);
   test.setDurationBeforeEnd(null);
   assertEquals(TEST_TIME2, test.getStartMillis());
   assertEquals(TEST_TIME2, test.getEndMillis());
 }