public boolean isCacheSecurityCredentials() {
        return cacheSecurityCredentials;
    }
@Test
    void testIsCacheSecurityCredentials() {
        assertTrue(StsConfig.getInstance().isCacheSecurityCredentials());
        StsConfig.getInstance().setCacheSecurityCredentials(false);
        assertFalse(StsConfig.getInstance().isCacheSecurityCredentials());
    }