code: @Test public void testIsActive(){
    featureUserProvider.setFeatureUser(null);
    assertEquals(false,manager.isActive(MyFeatures.DELETE_USERS));
    featureUserProvider.setFeatureUser(new SimpleFeatureUser("admin",false));
    assertEquals(true,manager.isActive(MyFeatures.DELETE_USERS));
    featureUserProvider.setFeatureUser(new SimpleFeatureUser("somebody",false));
    assertEquals(false,manager.isActive(MyFeatures.DELETE_USERS));
    featureUserProvider.setFeatureUser(null);
    assertEquals(false,manager.isActive(MyFeatures.EXPERIMENTAL));
  }
  