@Test
public void testGetPreviousReturnsValidRange() throws Exception {
Range _r = new Range(10, 10);
Range _r2 = _r.previous();
assertEquals(0, _r2.getStart());
assertEquals(9, _r2.getEnd());
assertEquals(10, _r2.getBatchSize());
assertEquals(10, _r2.getSize());
_r = new Range(0, 10, 14);
_r2 = _r.previous();
assertEquals(_r, _r2);
_r = new Range(3, 10, 14);
_r2 = _r.previous();
assertEquals(0, _r2.getStart());
assertEquals(9, _r2.getEnd());
assertEquals(10, _r2.getBatchSize());
assertEquals(10, _r2.getSize());
}
@Test
public void testAlwaysMakesAValidRange() throws Exception {
Range _r = new Range(-20, -6);
assertEquals(0, _r.getStart());
assertEquals(0, _r.getEnd());
assertEquals(1, _r.getBatchSize());
assertEquals(0, _r.getSize());
assertTrue(_r.hasNext());
assertFalse(_r.hasPrevious());
assertEquals(_r, _r.previous());
_r = new Range(-3, -3, -3);
assertEquals(0, _r.getStart());
assertEquals(0, _r.getEnd());
assertEquals(1, _r.getBatchSize());
assertEquals(0, _r.getSize());
assertFalse(_r.hasNext());
assertFalse(_r.hasPrevious());
assertEquals(_r, _r.next());
assertEquals(_r, _r.previous());
}