public boolean isRunning(Member member) {
        RpcClient client = RpcClientFactory.getClient(memberClientKey(member));
        if (null == client) {
            return false;
        }
        return client.isRunning();
    }
@Test
    void testIsRunningForClientConnected() {
        when(client.isRunning()).thenReturn(true);
        assertTrue(clusterRpcClientProxy.isRunning(member));
    }