private ConfigurationData createMandatoryFieldConfiguration() {
    final ConfigurationData config = ValidatorTestData.createEmptyConfigurationWithDefaultGroup();
    final UiGroupData group = config.getGroups().get(0);

    final CsticData checkBoxListCstic = new CsticData();
    checkBoxListCstic.setRequired(true);
    checkBoxListCstic.setType(UiType.CHECK_BOX_LIST);
    final List<CsticValueData> domainvalues = new ArrayList<>();
    checkBoxListCstic.setDomainvalues(domainvalues);
    group.getCstics().add(checkBoxListCstic);

    final CsticData stringCstic = new CsticData();
    stringCstic.setType(UiType.STRING);
    stringCstic.setRequired(true);
    group.getCstics().add(stringCstic);

    final CsticData dropDownCstic = new CsticData();
    dropDownCstic.setRequired(true);
    dropDownCstic.setType(UiType.DROPDOWN);
    dropDownCstic.setDomainvalues(domainvalues);
    group.getCstics().add(dropDownCstic);
    return config;
  }