@AfterEach
    public void tearDown() throws Exception {
        logger.removeHandler(logChecker);
        logger.setUseParentHandlers(initUseParentHandlers);
        logger.setLevel(initLevel);
    }
Check error logging from ContentChannelOutputStream is sane.

@author Steinar Knutsen
container-core/src/test/java/com/yahoo/container/jdisc/LoggingTestCase.java