### Question:
TaskQueueImpl implements
      TaskQueue,
      ApplicationListener,
      ApplicationEventPublisherAware,
      DisposableBean { @Nullable @Override public synchronized TaskState unstallConversion(long taskId) { AppFactoryTask task = taskRecorder.getTaskFromId(taskId); if (task.getCurrentTaskState().getType().equals(AppConvertState.TYPE)) { task.unstall(); return task.getCurrentTaskState(); } return null; } TaskQueueImpl(String name,
                 int expectedTasksPerId,
                 Supplier<Integer> maxPoolSizeSupplier,
                 Supplier<Integer> maxFinishedSizeSupplier); @Override synchronized void addTask(@Nonnull AppFactoryTask task); @Nonnull @Override synchronized Iterable<TaskState> getAllTasks(); @Nonnull @Override Iterable<TaskState> getTasks(Predicate<? super TaskState> predicate); @Override int countActiveTasksByDatastoreId(Long datastoreId); @Override @Nullable synchronized TaskState findTaskById(long id); @Nonnull @Override synchronized Iterable<? extends AbstractCaptureState> findActiveTasksForApp(
         final long appId); @Nonnull @Override synchronized Iterable<? extends TaskState> findActiveTasksForFeed(
         final long feedId); @Nullable @Override synchronized TaskState abortTask(long taskId); @Override synchronized boolean moveToHead(long taskIdToMove); @Override synchronized boolean moveToTail(long taskIdToMove); @Override synchronized boolean moveBefore(long taskIdToMove, long taskIdToFollow); @Override synchronized void cleanup(); @Override synchronized boolean cleanup(long taskId); @Nullable @Override synchronized TaskState unstallConversion(long taskId); @Override @Nonnull @VisibleForTesting List<Runnable> gracefulShutdown(boolean abortUnfinishedTasks); @Override synchronized void abortAllTasks(); @Override void destroy(); @Override void onApplicationEvent(ApplicationEvent applicationEvent); @Override void setApplicationEventPublisher(@Nullable ApplicationEventPublisher applicationEventPublisher);  }### Answer:
@Test public void testUnstallConversion() throws Exception { }