private Execution createExecution() {
        return new Execution(new Chain<Searcher>(
                new VespaLowercasingSearcher(new LowercasingConfig(new LowercasingConfig.Builder()))),
                Execution.Context.createContextStub(createIndexFacts()));
    }
Tests term lowercasing in the search chain.

@author Steinar Knutsen
container-search/src/test/java/com/yahoo/search/querytransform/LowercasingTestCase.java