assertEquals(-1, comp.compare(r0c1, r0c2));
assertEquals(1, comp.compare(r1c1, r1c2));
assertEquals(1, comp.compare(r2c1, r2c2));
// both r3cx are still "in the future"
assertEquals(-1, comp.compare(r3c1, r3c2));
// now we declare r3 of c1 to be before r3 of c2
// (with the same range timestamp,
// the revision timestamps are compared)
comp.add(r3c1, new Revision(0x30, 0, 0));