### Question:
PropertyMergePostProcessor implements SlingPostProcessor { protected static boolean looksLikeTag(String value) { return VALID_TAG.asPredicate().test(value); }  @Override final void process(final SlingHttpServletRequest request,
            final List<Modification> modifications);  }### Answer:
@Test public void testTagDetection() { Assert.assertTrue("Valid root tag detection", PropertyMergePostProcessor.looksLikeTag("Some_Root:")); Assert.assertTrue("Valid root tag detection", PropertyMergePostProcessor.looksLikeTag("Some_Root:Tag")); Assert.assertTrue("Valid sub tag detection", PropertyMergePostProcessor.looksLikeTag("Some_Root-123:Tag/Another_Tag456")); Assert.assertFalse("Invalid tag pattern", PropertyMergePostProcessor.looksLikeTag("Some_Root123")); Assert.assertFalse("Spaces check 1", PropertyMergePostProcessor.looksLikeTag("Some Root:Tag")); Assert.assertFalse("Spaces check 2", PropertyMergePostProcessor.looksLikeTag("Some_Root : Tag")); Assert.assertFalse("Spaces check 3", PropertyMergePostProcessor.looksLikeTag("Some_Root:Tag Name")); Assert.assertFalse("Spaces check 4", PropertyMergePostProcessor.looksLikeTag("Some_Root:Tag/Other Tag Name")); }