code: @Test public void resetTest(){
    Logger root=lc.getLogger(Logger.ROOT_LOGGER_NAME);
    Logger a=lc.getLogger("a");
    Logger ab=lc.getLogger("a.b");
    ab.setLevel(Level.WARN);
    root.setLevel(Level.INFO);
    lc.reset();
    assertEquals(Level.DEBUG,root.getEffectiveLevel());
    assertTrue(root.isDebugEnabled());
    assertEquals(Level.DEBUG,a.getEffectiveLevel());
    assertEquals(Level.DEBUG,ab.getEffectiveLevel());
    assertEquals(Level.DEBUG,root.getLevel());
    assertNull(a.getLevel());
    assertNull(ab.getLevel());
  }
  