static void checkExpectedEvent(
Iterable<WatchEvent<?>> events, WatchEvent.Kind<?> expectedKind, Object expectedContext) {
WatchEvent<?> event = events.iterator().next();
System.out.format(
"got event: type=%s, count=%d, context=%s\n", event.kind(), event.count(), event.context());
if (event.kind() != expectedKind) throw new RuntimeException("unexpected event");
if (!expectedContext.equals(event.context())) throw new RuntimeException("unexpected context");
}
