### Question:
SimpleUserSystemService implements UserSystemService { @Override public void test() { } SimpleUserSystemService(); @Override void start(); @Override String getName(); @Override List<User> findAllUsers(); List<Group> findAllGroups(); @Override void test(); @Override User findUser(String id); static final String USERS_FILE; static final String SKILLS_FILE; static final String AFFINITIES_FILE; static final String NAME; }### Answer:
@Test public void test() { userSystem.test(); }