};

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

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

    }

    /**
     * Gets all registered SSO authenticators.
     *
     * @return Array of all registered SSO authenticators
     */
    public SsoAuthenticator[] getAuthenticators() {
        return authenticatorList.toArray(new SsoAuthenticator[authenticatorList.size()]);
    }

    /**
     * Registers an SSO authenticator with this manager.
     *

        });
        final LoginCredentialResolver loginResolver = new LoginCredentialResolver(resolver);
        for (final SsoAuthenticator auth : ComponentUtil.getSsoManager().getAuthenticators()) {
            auth.resolveCredential(loginResolver);
        }
    }

    /**
     * A resolver for login credentials that wraps the standard credential resolver

     *
     * @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;