Simple mock support to override ResourceServiceBroker in unit tests by returning json file data

       final URL productJsonFileUrl = getClass().getResource("product-output.json");

       // mocking resourceResolver to override #findResources() only
       // and return a json output directly from a classpath resource.
       final Map resourceResolverMap = new HashMap<>();
       resourceResolverMap.put("productResources", new MockJacksonResourceResolverAdapter() {
           @Override
           public Resource findResources(String baseAbsPath, Map pathVariables, ExchangeHint exchangeHint)
                   throws ResourceException {
               return urlToResource(productJsonFileUrl);
           }
       });
       // you can add more resourceResolver(s)...

       // mocking resourceServiceBroker.
       ResourceServiceBroker mockBroker = new MockResourceServiceBroker(resourceResolverMap);
       // register the mocking resourceServiceBroker.
       MockCrispHstServices.setDefaultResourceServiceBroker(mockBroker);

       // From now on, CrispHstServices.getDefaultResourceServiceBroker() will return the resourceServiceBroker
       // which was mocked above...
       ResourceServiceBroker broker = CrispHstServices.getDefaultResourceServiceBroker(); // broker == mockBroker
       // ...