code: @Test public void testConfigureCacheUpdatePeriodWithPropertiesFileSet(){
    factory=new PropertiesAndFilterConfigWroConfigurationFactory(filterConfig){
      @Override protected Properties newDefaultProperties(){
        final Properties props=new Properties();
        props.put(ConfigConstants.cacheUpdatePeriod.name(),"15");
        props.put(ConfigConstants.modelUpdatePeriod.name(),"30");
        return props;
      }
    }
  ;
    Mockito.when(filterConfig.getInitParameter(ConfigConstants.cacheUpdatePeriod.name())).thenReturn("10");
    final WroConfiguration config=factory.create();
    Assert.assertEquals(10,config.getCacheUpdatePeriod());
    Assert.assertEquals(true,config.isDebug());
    Assert.assertEquals(10,config.getCacheUpdatePeriod());
    Assert.assertEquals(30,config.getModelUpdatePeriod());
  }
  