assertEquals(map.getJoinedValue("baz", ", "), "foo, bar");
assertEquals(map.get("baz"), Arrays.asList("foo", "bar"));
map.replaceAll((Map<String, Collection<String>>) null);
assertEquals(map.keySet(), new LinkedHashSet<String>(Arrays.asList("foo", "bar", "baz")));
assertEquals(map.getFirstValue("foo"), "bar");
assertEquals(map.getJoinedValue("foo", ", "), "bar");
assertEquals(map.get("foo"), Arrays.asList("bar"));
assertEquals(map.getFirstValue("bar"), "foo, bar");
assertEquals(map.getJoinedValue("bar", ", "), "foo, bar, baz");