@Test
public void setDebugMode() throws Exception {

    boolean old = RpcRunningState.isDebugMode();
    try {
        RpcRunningState.setDebugMode(true);
        Assert.assertTrue(RpcRunningState.isDebugMode());
        RpcRunningState.setDebugMode(false);
        Assert.assertFalse(RpcRunningState.isDebugMode());
    } finally {
        RpcRunningState.setDebugMode(old);
    }
}