};

        SsoAuthenticator authenticator = ssoManager.getAuthenticator();
        assertNull(authenticator);
    }

    // Test register() and getAuthenticators() methods
    @Test
    public void test_register_singleAuthenticator() {
        ssoManager.register(testAuthenticator);
        SsoAuthenticator[] authenticators = ssoManager.getAuthenticators();
        assertEquals(1, authenticators.length);

     *         or no credential could be obtained
     */
    public LoginCredential getLoginCredential() {
        if (available()) {
            final SsoAuthenticator authenticator = getAuthenticator();
            if (authenticator != null) {
                return authenticator.getLoginCredential();
            }
        }
        return null;
    }

    /**

     *
     * @return The configured SPNEGO authenticator instance
     * @throws SsoLoginException if SPNEGO initialization fails
     */
    protected synchronized org.codelibs.spnego.SpnegoAuthenticator getAuthenticator() {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        if (authenticator != null && fessConfig.getSystemPropertyAsBoolean(SPNEGO_INITIALIZED, false)) {
            return authenticator;