### Question:
Configuration implements Serializable, Cloneable { public static ConfigurationBuilder builder() { return new ConfigurationBuilder(); } Configuration(File base, SymbolTable symbolTable, List<ValidatorConfiguration> validatorConfigs, String lang, boolean secure); static List<String> getDefaultConfigKeys(); SymbolTable getSymbolTable(); List<ValidatorConfiguration> getValidatorConfigs(); String getLang(); String getVariant(); RedPenTokenizer getTokenizer(); String getKey(); File getHome(); File getBase(); File findFile(String relativePath); boolean isSecure(); @Override Configuration clone(); @Override boolean equals(Object o); @Override int hashCode(); @Override String toString(); static ConfigurationBuilder builder(); static ConfigurationBuilder builder(String key);  }### Answer:
@Test void testInvalidValidatorConfiguration() { try { Configuration.builder() .addValidatorConfig(new ValidatorConfiguration("ThereIsNoSuchValidator")).build(); } catch (Exception e) { fail("Exception not expected."); } }