MDC { public static void remove(final String key) { ThreadContext.remove(key); } private  MDC(); @SuppressWarnings({ "rawtypes", "unchecked" }) static Hashtable getContext(); static Object get(final String key); static void put(final String key, final Object value); static void remove(final String key); static void clear();  }
@Test public void removeValue() { MDC.remove("pi"); verify(provider).remove("pi"); }