void setUp() {
        MockitoAnnotations.openMocks(this);
    }

    /**
     * Test constructor with a valid login context.
     *
     * @throws LoginException if login fails.
     */
    @Test
    void testConstructor_Success() throws LoginException {
        try (MockedConstruction<LoginContext> mocked = Mockito.mockConstruction(LoginContext.class, (mock, context) -> {
            when(mock.getSubject()).thenReturn(subject);

        this(System.getProperty("jaaslounge.sso.jaas.config"));
    }

    /**
     * Creates KerberosCredentials using the specified JAAS login context.
     *
     * @param loginContextName the name of the JAAS login context
     * @throws LoginException if authentication fails
     */
    public KerberosCredentials(String loginContextName) throws LoginException {
        LoginContext lc = new LoginContext(loginContextName);

import java.security.GeneralSecurityException;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;

import javax.security.auth.kerberos.KerberosKey;
import javax.security.auth.login.LoginException;

import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;

        final SsoMessageException loginException = new SsoMessageException(loginErrorCode, message);
        final SsoMessageException logoutException = new SsoMessageException(logoutErrorCode, message);

        // Verify
        assertEquals(loginErrorCode, loginException.getMessageCode());
        assertEquals(logoutErrorCode, logoutException.getMessageCode());

import javax.security.auth.callback.UnsupportedCallbackException;
import javax.security.auth.login.Configuration;
import javax.security.auth.login.LoginContext;
import javax.security.auth.login.LoginException;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import jcifs.CIFSException;

/**
 * JAAS kerberos authenticator
 *