code: @Test public void should_return_set_wrapper() throws Throwable {
    PropertyMeta propertyMeta=completeBean(Void.class,String.class).field("followers").accessors().type(PropertyType.SET).build();
    getterMetas.put(propertyMeta.getGetter(),propertyMeta);
    rawValue=new HashSet<String>();
    when(invoker.getValueFromField(target,propertyMeta.getField())).thenReturn(rawValue);
    Object actual=interceptor.intercept(target,propertyMeta.getGetter(),args,proxy);
    assertThat(actual).isInstanceOf(SetWrapper.class);
  }
  