public F get(long timeout, TimeUnit unit) throws InterruptedException,
                ExecutionException, TimeoutException {
            return wrapped.get(timeout, unit);
        }
Test adding hits to a hit group during rendering.

@author <a href="mailto:steinar@yahoo-inc.com">Steinar Knutsen</a>
container-search/src/test/java/com/yahoo/search/rendering/AsyncGroupPopulationTestCase.java