private void check(Range rng, int a, int b) {
rng.set(a, b);
eq(rng, a, b);
eq(rng.limit(), rng.start + rng.length);
long backup = rng.backup();
rng.set(rnd(), rnd());
rng.restore(backup);
eq(rng, a, b);
}
@Test
public void shouldBackupAndRestore() {
Range range = new Range(10, 3);
eq(range, 10, 3);
long backup = range.backup();
range.set(7, 17);
eq(range, 7, 17);
range.restore(backup);
eq(range, 10, 3);
}