@Test public void testFilterIsIn() { final Predicate<Taggable> checkMe = ISOCountryTag .isIn(IsoCountry.forCountryCode("KOR").get()); Assert.assertTrue(checkMe.test(new TestTaggable(ISOCountryTag.KEY, "KOR"))); Assert.assertFalse(checkMe.test(new TestTaggable(ISOCountryTag.KEY, "PRK"))); }