@Before
    public void setUp() throws Exception {
        oldLevel = root.getLevel();
        root.setLevel(Level.FINE);
        // removeAllHandlers(root);
        root.addHandler(listHandler);
    }
Test whether invoking the SLF4J API causes problems or not.

@author Ceki Gulcu
slf4j-jdk14/src/test/java/org/slf4j/jul/InvocationTest.java