@AfterClass
    static public void afterClass() {
        System.setErr(oldErr);
        System.clearProperty(SIMPLE_LOGGER_THREAD_NAME_PROPERTY);
    }
The present test is fragile in the sense that it sets up SimpleLogger
with a StringPrintStream and reverts to the old stream when done.

Any tests running simultaneously (and using SimpleLogger) will be affected 
by this. Moreover, since SimpleLogger is initialized by the call to LoggerFactory
and tests also using LoggerFactory will also be affected.

@author Ceki G&uuml;lc&uuml;
slf4j-jdk-platform-logging/src/test/java/org/slf4j/jdk/platform/logging/test/SLF4JPlatformLoggingTest.java