public void testFactory_minutesIn_RInterval() {
    DateTime start = new DateTime(2006, 6, 9, 12, 3, 0, 0, PARIS);
    DateTime end1 = new DateTime(2006, 6, 9, 12, 6, 0, 0, PARIS);
    DateTime end2 = new DateTime(2006, 6, 9, 12, 9, 0, 0, PARIS);

    assertEquals(0, Minutes.minutesIn((ReadableInterval) null).getMinutes());
    assertEquals(3, Minutes.minutesIn(new Interval(start, end1)).getMinutes());
    assertEquals(0, Minutes.minutesIn(new Interval(start, start)).getMinutes());
    assertEquals(0, Minutes.minutesIn(new Interval(end1, end1)).getMinutes());
    assertEquals(6, Minutes.minutesIn(new Interval(start, end2)).getMinutes());
  }