code: @Test public void should_mark_dirty_on_put() throws Exception {
    Map<Integer,String> target=prepareMap();
    MapWrapper wrapper=prepareMapWrapper(target);
    wrapper.put(4,"sdfs");
    DirtyChecker dirtyChecker=dirtyMap.get(setter);
    assertThat(dirtyChecker.getPropertyMeta()).isEqualTo(propertyMeta);
    DirtyCheckChangeSet changeSet=dirtyChecker.getChangeSets().get(0);
    assertThat(changeSet.getChangeType()).isEqualTo(ADD_TO_MAP);
    assertThat(changeSet.getPropertyMeta()).isEqualTo(propertyMeta);
    assertThat(changeSet.getRawMapChanges()).hasSize(1).containsKey(4).containsValue("sdfs");
  }
  