public String msg(String msg, Object... args) {
        LogMessage l = new LogMessage();
        l.kvs = this.kvs;
        return l.setMsgString(msg, args);
    }
@Test
    public void testMsgShouldContainsMessageAndThrowableMessage() {
        final String message = logMessage.msg(MESSAGE, new Throwable(THROWABLE_MESSAGE));
        assertNotNull(message);
        assertTrue(message.contains(MESSAGE));
        assertTrue(message.contains(THROWABLE_MESSAGE));
    }