@Test
public void notifiesOnStateChange() {
Transaction t = new DummyTransaction();
t.onProgress(() -> progress.add(null));
t.toState(FAILED);
assertEquals(1, progress.size());
}
@Test
public void notifiesOnProgress() {
Transaction t = new DummyTransaction();
t.onProgress(() -> progress.add(null));
t.setTransferred(10L);
assertEquals(1, progress.size());
}