Here it is
fun daysBeforeDoom() {
return doomTime - System.currentTimeMillis()) / millisInDay
}while (true) {
Thread.sleep(ONE_DAY)
println(“${daysBeforeDoom()} days left till the doomsday”)
}
while (true) {
Thread.sleep(ONE_DAY)
println(“${daysBeforeDoom()} days left till the doomsday”)
}
increaseTime(ONE_DAY)
waitUntilThreadsAreFrozen(1_000/ms, timeout/)
checkMessage()
long timeMillis();
long nanoTime();
void sleep(long millis) throws InterruptedException;
void sleep(long millis, int nanos) throws InterruptedException;
void waitOn(Object monitor, long millis) throws InterruptedException;
void waitOn(Object monitor, long millis, int nanos) throws InterruptedException;
void notifyAll(Object monitor);
void notify(Object monitor);
void park(boolean isAbsolute, long time);
void unpark(Object thread);
@Before
public void setup() {
// Use TestTimeProvider for this test
TestTimeProvider.start(/* initial time could be passed here /);
}

@After
public void reset() {
// Reset time provider to default after the test execution
TestTimeProvider.reset();
}

@Test
public void test() {
runMyConcurrentApplication();
TestTimeProvider.increaseTime(60_000 /ms/);
TestTimeProvider.waitUntilThreadsAreFrozen(1_000 /ms*/);
checkMyApplicationState();
}