### Question:
IpFilters { public static IpFilter createCached(Config config) { return new CachedIpFilter(create(config)); }  static IpFilter create(Config config); static IpFilter createCached(Config config);  }### Answer:
@Test public void createCachedIpFilterWithConfig() { IpFilter filter = IpFilters.createCached(createConfig()); assertTrue(filter instanceof CachedIpFilter); }