@BeforeAll
    public static void createExecutorAndBlueprint() {
        ThreadFactory threadFactory = ThreadFactoryFactory.getThreadFactory("test-rendering");
        executor = new ThreadPoolExecutor(4, 4, 1L, TimeUnit.MINUTES, new LinkedBlockingQueue<>(), threadFactory);
        executor.prestartAllCoreThreads();
        blueprint = new JsonRenderer(executor);
    }
Functional testing of {@link JsonRenderer}.

@author Steinar Knutsen
@author bratseth
container-search/src/test/java/com/yahoo/search/rendering/JsonRendererTestCase.java