@Override
        public Result search(Query query, Execution execution) {
            final Result result = new Result(query);
            result.hits().setField(PROPAGATION_KEY, IS_THIS_PROPAGATED);
            return result;
        }
Test for federation searcher. The searcher is also tested in
com.yahoo.prelude.searcher.test.BlendingSearcherTestCase.

@author Arne Bergene Fossaa
container-search/src/test/java/com/yahoo/search/federation/FederationSearcherTestCase.java