*/
public void test_Config() throws Exception {
// create login module for testing
Krb5LoginModule module = new Krb5LoginModule();
module.initialize(null, new MockCallbackHandler(), null, options);
// case 1: unset 'kdc' and set 'real' sys.props
TestUtils.setSystemProperty(ENV_KDC, null);
TestUtils.setSystemProperty(ENV_REALM, "some_value");
try {