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);