### Question:
AccountAccessMultipleAccountsValidator { public ValidationResult validate(AisConsent aisConsent, boolean withBalance) { if (withBalance && aisConsent.isConsentForDedicatedAccounts()) { AccountAccess access = aisConsent.getAccess(); return validateAccountReferenceSize(access.getAccounts(), access.getBalances()) ? ValidationResult.invalid(ErrorType.AIS_401, CONSENT_INVALID) : ValidationResult.valid(); } return ValidationResult.valid(); }  ValidationResult validate(AisConsent aisConsent, boolean withBalance);  }### Answer:
@Test void DEDICATED_ACCOUNTS_WithBalance_shouldReturnValid() { AisConsent accountConsent = getAccountConsentFromFileAndUpdateRequestType(DEDICATED_CONSENT_PATH); ValidationResult actual = validator.validate(accountConsent, true); assertTrue(actual.isValid()); }
@Test void DEDICATED_ACCOUNTS_WithBalance_shouldReturnError() { AisConsent accountConsent = getAccountConsentFromFileAndUpdateRequestType(DEDICATED_CONSENT_WITH_MULTIPLE_ACCOUNTS_PATH); ValidationResult actual = validator.validate(accountConsent, true); assertTrue(actual.isNotValid()); assertEquals(new MessageError(ErrorType.AIS_401, TppMessageInformation.of(CONSENT_INVALID)), actual.getMessageError()); }
@Test void DEDICATED_ACCOUNTS_WithoutBalance_shouldReturnValid() { AisConsent accountConsent = getAccountConsentFromFileAndUpdateRequestType(DEDICATED_CONSENT_WITH_MULTIPLE_ACCOUNTS_PATH); ValidationResult actual = validator.validate(accountConsent, false); assertTrue(actual.isValid()); }
@Test void GLOBAL_WithBalance_shouldReturnValid() { AisConsent accountConsent = getAccountConsentFromFileAndUpdateRequestType(GLOBAL_CONSENT_PATH); ValidationResult actual = validator.validate(accountConsent, true); assertTrue(actual.isValid()); }
@Test void GLOBAL_WithoutBalance_shouldReturnValid() { AisConsent accountConsent = getAccountConsentFromFileAndUpdateRequestType(GLOBAL_CONSENT_PATH); ValidationResult actual = validator.validate(accountConsent, false); assertTrue(actual.isValid()); }
@Test void ALL_AVAILABLE_ACCOUNTS_WithBalance_shouldReturnValid() { AisConsent accountConsent = getAccountConsentFromFileAndUpdateRequestType(ALL_AVAILABLE_ACCOUNTS_CONSENT_PATH); ValidationResult actual = validator.validate(accountConsent, true); assertTrue(actual.isValid()); }
@Test void ALL_AVAILABLE_ACCOUNTS_WithoutBalance_shouldReturnValid() { AisConsent accountConsent = getAccountConsentFromFileAndUpdateRequestType(ALL_AVAILABLE_ACCOUNTS_CONSENT_PATH); ValidationResult actual = validator.validate(accountConsent, false); assertTrue(actual.isValid()); }
@Test void BANK_OFFERED_ACCOUNTS_WithBalance_shouldReturnValid() { AisConsent accountConsent = getAccountConsentFromFileAndUpdateRequestType(BANK_OFFERED_CONSENT_PATH); ValidationResult actual = validator.validate(accountConsent, true); assertTrue(actual.isValid()); }
@Test void BANK_OFFERED_ACCOUNTS_WithoutBalance_shouldReturnValid() { AisConsent accountConsent = getAccountConsentFromFileAndUpdateRequestType(BANK_OFFERED_CONSENT_PATH); ValidationResult actual = validator.validate(accountConsent, false); assertTrue(actual.isValid()); }