@Test
public void statusFromCancelled_returnCancelledIfCauseIsNull() {
Context.CancellableContext cancellableContext = Context.current().withCancellation();
cancellableContext.cancel(null);
assertTrue(cancellableContext.isCancelled());
Status status = statusFromCancelled(cancellableContext);
assertNotNull(status);
assertEquals(Status.Code.CANCELLED, status.getCode());
}
/** This is a whitebox test, to verify a special case of the implementation. */
@Test
public void statusFromCancelled_StatusUnknownShouldWork() {
Context.CancellableContext cancellableContext = Context.current().withCancellation();
Exception e = Status.UNKNOWN.asException();
cancellableContext.cancel(e);
assertTrue(cancellableContext.isCancelled());
Status status = statusFromCancelled(cancellableContext);
assertNotNull(status);
assertEquals(Status.Code.UNKNOWN, status.getCode());
assertSame(e, status.getCause());
}
@Test
public void statusFromCancelled_TimeoutExceptionShouldMapToDeadlineExceeded() {
FakeClock fakeClock = new FakeClock();
Context.CancellableContext cancellableContext =
Context.current()
.withDeadlineAfter(100, TimeUnit.MILLISECONDS, fakeClock.scheduledExecutorService);
fakeClock.forwardTime(System.nanoTime(), TimeUnit.NANOSECONDS);
fakeClock.forwardMillis(100);
assertTrue(cancellableContext.isCancelled());
assertThat(cancellableContext.cancellationCause(), instanceOf(TimeoutException.class));
Status status = statusFromCancelled(cancellableContext);
assertNotNull(status);
assertEquals(Status.Code.DEADLINE_EXCEEDED, status.getCode());
assertEquals("context timed out", status.getDescription());
}