RdfEngine implements Engine { @Override public Set<User> getUsers() { Set<User> users = new HashSet<>(); try (RepositoryConnection conn = repository.getConnection()) { GraphQuery query = conn.prepareGraphQuery(GET_USERS_QUERY); Model usersModel = QueryResults.asModel(query.evaluate(), mf); users.addAll(userFactory.getAllExisting(usersModel)); } return users; }  @Override Optional<Role> getRole(String roleName); @Override Set<User> getUsers(); @Override User createUser(UserConfig userConfig); @Override void storeUser(User user); @Override boolean userExists(String username); @Override boolean userExists(Resource userId); @Override Optional<User> retrieveUser(String username); @Override void updateUser(User newUser); @Override void deleteUser(String username); @Override Set<Group> getGroups(); @Override Group createGroup(GroupConfig groupConfig); @Override void storeGroup(Group group); @Override boolean groupExists(String groupTitle); @Override boolean groupExists(Resource groupId); @Override Optional<Group> retrieveGroup(String groupTitle); @Override void updateGroup(Group newGroup); @Override void deleteGroup(String groupTitle); @Override Set<Role> getUserRoles(String username); @Override boolean checkPassword(String username, String password); @Override String getEngineName(); static final String ENGINE_NAME; }
@Test public void testGetUsers() { Set<String> expectedUsernames = Stream.of("admin", username).collect(Collectors.toSet()); Set<User> users = engine.getUsers(); assertEquals(expectedUsernames.size(), users.size()); users.forEach(user -> { Optional<Literal> optUsername = user.getUsername(); assertTrue(optUsername.isPresent()); assertTrue(expectedUsernames.contains(optUsername.get().stringValue())); }); }