@Test
    public void testMDC() {
        MDC.put("k", "v");
        assertNull(MDC.get("k"));
        MDC.remove("k");
        assertNull(MDC.get("k"));
        MDC.clear();
    }
Test whether invoking the SLF4J API causes problems or not.

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