@Override
    public Collection<String> allClientId() {
        return clients.keySet();
    }
@Test
    void testAllClientId() {
        Collection<String> allClientIds = connectionBasedClientManager.allClientId();
        assertEquals(1, allClientIds.size());
        assertTrue(connectionBasedClientManager.verifyClient(new DistroClientVerifyInfo(connectionId, 0)));
        assertTrue(allClientIds.contains(connectionId));
    }