### Question:
ZuulBlockFallbackManager { public synchronized static void clear(){ fallbackProviderCache.clear(); }  static synchronized void registerProvider(ZuulBlockFallbackProvider provider); static ZuulBlockFallbackProvider getFallbackProvider(String route); synchronized static void clear();  }### Answer:
@Test public void clear() { MyNullResponseFallBackProvider myNullResponseFallBackProvider = new MyNullResponseFallBackProvider(); ZuulBlockFallbackManager.registerProvider(myNullResponseFallBackProvider); Assert.assertEquals(myNullResponseFallBackProvider.getRoute(), ROUTE); ZuulBlockFallbackManager.clear(); Assert.assertEquals(ZuulBlockFallbackManager.getFallbackProvider(ROUTE).getRoute(), DEFAULT_ROUTE); }