private List<Searcher> createSearchers(int count) {
        List<Searcher> searchers=new ArrayList<>(count);
        for (int i=0; i<count; i++)
            searchers.add(new TestSearcher("s" + (i+1)));
        return searchers;
    }
Tests basic search chain functionality - creation, inheritance and ordering

@author bratseth
container-search/src/test/java/com/yahoo/search/searchchain/test/SearchChainTestCase.java