@Test
public void testChangeLogLevel() throws RemotingException {

    mockChannel = mock(Channel.class);
    String result = log.telnet(mockChannel, "error");
    assertTrue(result.contains("\r\nCURRENT LOG LEVEL:ERROR"));
    String result2 = log.telnet(mockChannel, "warn");
    assertTrue(result2.contains("\r\nCURRENT LOG LEVEL:WARN"));
}