@Override
    public boolean contains(String clientId) {
        return clients.containsKey(clientId);
    }
@Test
    void testContainsEphemeralIpPortId() {
        assertTrue(ephemeralIpPortClientManager.contains(ephemeralIpPortId));
        assertTrue(ephemeralIpPortClientManager.contains(syncedClientId));
        String unUsedClientId = "127.0.0.1:8888#true";
        assertFalse(ephemeralIpPortClientManager.contains(unUsedClientId));
    }