/**
  * Test method for {@link KNXNetworkLinkFT12#close()}.
  *
  * @throws InterruptedException on interrupted thread
  * @throws KNXTimeoutException
  */
 @Test
 public final void testClose() throws InterruptedException, KNXTimeoutException {
   System.out.println(lnk.toString());
   assertTrue(lnk.isOpen());
   lnk.close();
   System.out.println(lnk.toString());
   // time for link event notifier
   Thread.sleep(50);
   assertTrue(nll.closed);
   assertFalse(lnk.isOpen());
   lnk.close();
   try {
     lnk.send(frame, false);
     fail("we are closed");
   } catch (final KNXLinkClosedException e) {
   }
   try {
     lnk.send(frame, false);
     fail("we are closed");
   } catch (final KNXLinkClosedException e) {
   }
 }
 /** Test method for {@link KNXNetworkLinkFT12#isOpen()}. */
 @Test
 public final void testIsOpen() {
   assertTrue(lnk.isOpen());
   lnk.close();
   assertFalse(lnk.isOpen());
 }