### Question:
TppController implements TppRestApi { @Override public ResponseEntity<Set<Currency>> getCurrencies() { return dataRestClient.currencies(); }  @Override void login(String login, String pin); @Override ResponseEntity<Set<Currency>> getCurrencies(); @Override ResponseEntity<Map<CountryCode, String>> getSupportedCountryCodes(); @Override ResponseEntity<BankCodeStructure> getBankCodeStructure(String countryCode); @Override ResponseEntity<String> getRandomTppId(String countryCode); @Override ResponseEntity<Void> register(User user); @Override ResponseEntity<Void> remove(); @Override ResponseEntity<Void> transactions(String accountId); @Override ResponseEntity<Void> account(String accountId); @Override ResponseEntity<Void> user(String userId); @Override ResponseEntity<Void> revert(RevertRequestTO revertRequest);  }### Answer:
@Test void getCurrencies() { when(dataRestClient.currencies()).thenReturn(ResponseEntity.ok(getSupportedCurrencies())); ResponseEntity<Set<Currency>> response = tppController.getCurrencies(); assertTrue(response.getStatusCode().is2xxSuccessful()); assertEquals(Objects.requireNonNull(response.getBody()).size(), getSupportedCurrencies().size()); }