@Test
public void backups() {
Balancer<Void, MockDatabase> balancer =
this.factory.createBalancer(Collections.<MockDatabase>emptySet());
Iterable<MockDatabase> result = balancer.backups();
assertNotNull(result);
Iterator<MockDatabase> backups = result.iterator();
assertFalse(backups.hasNext());
balancer = this.factory.createBalancer(Collections.singleton(this.databases[0]));
result = balancer.backups();
assertNotNull(result);
backups = result.iterator();
assertFalse(backups.hasNext());
balancer =
this.factory.createBalancer(
new HashSet<MockDatabase>(Arrays.asList(this.databases[0], this.databases[1])));
result = balancer.backups();
assertNotNull(result);
backups = result.iterator();
assertTrue(backups.hasNext());
assertSame(this.databases[1], backups.next());
assertFalse(backups.hasNext());
balancer =
this.factory.createBalancer(new HashSet<MockDatabase>(Arrays.asList(this.databases)));
result = balancer.backups();
assertNotNull(result);
backups = result.iterator();
assertTrue(backups.hasNext());
assertSame(this.databases[1], backups.next());
assertTrue(backups.hasNext());
assertSame(this.databases[2], backups.next());
assertFalse(backups.hasNext());
}
