### Question:
DbStore implements Store, UserAddressStore { public static DbStore getInstance() { return INSTANCE; } private  DbStore(); static DbStore getInstance(); @Override User findByLogin(String login); @Override void add(User user); @Override void update(User newUser); @Override void delete(int userId); @Override List<User> findAll(); @Override User findById(int id); List<String> findAllCountries(); List<String> findCitiesByCountry(String name);  }### Answer:
@Test public void getInstance() { assertThat(this.testStore, is(DbStore.getInstance())); }