@Test
public void get_shouldJoinTheCreatedThread_givenAFutureReturnedByExecute() throws Exception {
long startTime = System.nanoTime();
Future<?> result = asyncExecutor.execute(suppressCheckedExceptions(() -> Thread.sleep(250L)));
result.get();
long endTime = System.nanoTime();
assertThat(endTime - startTime, isGreaterThan(100 * 1000000L));
}
@Test
public void isDone_shouldReturnFalse_whenTheThreadIsFinished_givenAFutureReturnedByExecute()
throws Exception {
Future<?> result = asyncExecutor.execute(() -> {});
Thread.sleep(50L); // give other thread a chance to finish...
assertTrue(result.isDone());
}
@Test
public void get_shouldSucceed_whenTheThreadThrowsAnException_givenAFutureReturnedByExecute()
throws Exception {
Future<?> result =
asyncExecutor.execute(
() -> {
throw new RuntimeException("blah");
});
result.get(100, TimeUnit.MILLISECONDS);
}
@Test
public void cancel_shouldThrowAnUnsupportedOperationException_givenAFutureReturnedByExecute()
throws Exception {
Future<?> result = asyncExecutor.execute(() -> {});
try {
result.cancel(true);
fail("Expected an exception");
} catch (UnsupportedOperationException ignore) {
}
}
@Test
public void
getWithATimeout_shouldThrowATimeoutException_whenTheThreadDoesNotEndQuickly_givenAFutureReturnedByExecute()
throws Exception {
Future<?> result = asyncExecutor.execute(suppressCheckedExceptions(() -> Thread.sleep(250L)));
try {
result.get(50, TimeUnit.MILLISECONDS);
fail("Expected an exception");
} catch (TimeoutException ignore) {
}
}
@Test
public void isDone_shouldReturnTrue_whenTheThreadIsAlive_givenAFutureReturnedByExecute()
throws Exception {
CountDownLatch latch = new CountDownLatch(1);
Future<?> result = asyncExecutor.execute(suppressCheckedExceptions(latch::await));
try {
assertFalse(result.isDone());
} finally {
latch.countDown(); // don't want a thread waiting forever...
}
}
@Test
public void getWithATimeout_shouldSucceed_whenTheThreadEndsQuickly_givenAFutureReturnedByExecute()
throws Exception {
Future<?> result = asyncExecutor.execute(suppressCheckedExceptions(() -> Thread.sleep(50L)));
result.get(100, TimeUnit.MILLISECONDS);
}
@Test
public void isCancelled_shouldReturnFalse_givenAFutureReturnedByExecute() throws Exception {
Future<?> result = asyncExecutor.execute(() -> {});
assertFalse(result.isCancelled());
}