private static ProcessingHandler createProcessingHandler(Collection<Chain<Processor>> chains,
                                                             ComponentRegistry<Renderer> renderers,
                                                             AccessLog accessLog) {
        Executor executor = Executors.newSingleThreadExecutor();

        ChainRegistry<Processor> registry = new ChainRegistry<>();
        for (Chain<Processor> chain : chains)
            registry.register(chain.getId(), chain);
        return new ProcessingHandler(registry, renderers, executor, accessLog);
    }
A helper for making processing requests and rendering their responses.
Create an instance of this to test making processing requests and get the response or response data.

@author bratseth
container-core/src/main/java/com/yahoo/processing/handler/ProcessingTestDriver.java