@Test
public void sleepUntilRegular() throws InterruptedException {
long start = System.currentTimeMillis();
for (int i = 1; i <= 100; i++) {
ThreadUtil.sleepUntilMs(start + i);
}
long elapsed = System.currentTimeMillis() - start;
assertTrue(elapsed >= 100);
// this is probably also flaky as hell due to different scheduling behaviour of different
// platforms. lets see how well it does.
assertTrue(elapsed <= 125);
}
@Test
public void sleepUntilMsIntoThePast() throws InterruptedException {
// 1000 times no sleep at all
long tStart = System.nanoTime();
for (int i = 0; i < 1000; i++) {
long tms = System.currentTimeMillis();
ThreadUtil.sleepUntilMs(tms - 10); // noop
}
long elapsed = (System.nanoTime() - tStart);
// this should finish within a few hundred microseconds
// but that would make the test very flaky due to os-specific scheduling
assertTrue(elapsed < 25_000_1000); // 25ms
}
