private Execution createExecution(SignificanceSearcher searcher, Language language) {
        var context = Execution.Context.createContextStub();
        context.setLinguistics(new MockLinguistics(language));
        return new Execution(new Chain<>(searcher), context);
    }
Tests significance term in the search chain.

@author MariusArhaug
container-search/src/test/java/com/yahoo/search/significance/test/SignificanceSearcherTest.java