### Question:
MongoDbAuthorityConverter implements HydratingModelConverter<Authority, MongoDbAuthority> { @Override public void hydrate(MongoDbAuthority dehydrated) { }  @Override void hydrate(MongoDbAuthority dehydrated); @Override Class<Authority> getSourceType(); @Override MongoDbAuthority convert(Authority source);  }### Answer:
@Test public void hydrate_Valid(){ MongoDbAuthority authority = new MongoDbAuthority(); authorityConverter.hydrate(authority); assertNotNull(authority); }