code: @Test public void shouldSupportAbstractGroup(){
    factory=new GroovyModelFactory(){
      @Override protected InputStream getModelResourceAsStream() throws IOException {
        return getClass().getResourceAsStream("abstractGroup.groovy");
      }
    }
  ;
    final WroModel model=factory.create();
    assertNotNull(model);
    assertEquals(1,model.getGroups().size());
    final Group group=model.getGroups().iterator().next();
    assertEquals("nonAbstractGroup",group.getName());
    assertEquals(1,group.getResources().size());
  }
  