NoopTagExtractor implements TagExtractor { @Override public Map<String, String> addTags(Map<String, String> tags) { return tags; }  @Override Map<String, String> addTags(Map<String, String> tags);  }
@Test public void testAddTags() { final NoopTagExtractor noopTagExtractor = new NoopTagExtractor(); final Map<String, String> currentMap = ImmutableMap.of("foo", "bar", "bar", "baz", "cluster", "cluster1"); final Map<String, String> out = noopTagExtractor.addTags(currentMap); assertEquals(ImmutableMap.of("foo", "bar", "bar", "baz", "cluster", "cluster1"), out); }