### Question:
MongoDbPortalPreferenceConverter implements HydratingModelConverter<PortalPreference, MongoDbPortalPreference> { @Override public void hydrate(MongoDbPortalPreference dehydrated) { }  @Override void hydrate(MongoDbPortalPreference dehydrated); @Override Class<PortalPreference> getSourceType(); @Override MongoDbPortalPreference convert(PortalPreference source);  }### Answer:
@Test public void hydrate(){ MongoDbPortalPreference mpp = new MongoDbPortalPreference(); converter.hydrate(mpp); assertNotNull(mpp); }