code: @Test public void shouldConsiderContributeMethodsWhenManagerFactoryIsExtended(){
    final String alias="contributed";
    victim=new ConfigurableWroManagerFactory(){
      @Override protected void contributePreProcessors(    final Map<String,ResourcePreProcessor> map){
        map.put(alias,new JSMinProcessor());
      }
      @Override protected void contributePostProcessors(    final Map<String,ResourcePostProcessor> map){
        map.put(alias,new JSMinProcessor());
      }
      @Override protected void contributeLocators(    final Map<String,UriLocator> map){
        map.put(alias,new UrlUriLocator());
      }
    }
  ;
    final Properties configProperties=new Properties();
    configProperties.setProperty(ConfigurableProcessorsFactory.PARAM_PRE_PROCESSORS,alias);
    configProperties.setProperty(ConfigurableProcessorsFactory.PARAM_POST_PROCESSORS,alias);
    configProperties.setProperty(ConfigurableLocatorFactory.PARAM_URI_LOCATORS,alias);
    victim.setConfigProperties(configProperties);
    final WroManager manager=victim.create();
    assertFalse(manager.getProcessorsFactory().getPostProcessors().isEmpty());
    assertFalse(manager.getProcessorsFactory().getPreProcessors().isEmpty());
  }
  