assertEquals(map.getJoinedValue("baz", ", "), "foo, bar");
assertEquals(map.get("baz"), Arrays.asList("foo", "bar"));
map.deleteAll(Arrays.asList("bAz", "fOO"));
assertEquals(map.keySet(), new LinkedHashSet<String>(Arrays.asList("foo", "baz")));
assertEquals(map.getFirstValue("foo"), "bar");
assertEquals(map.getJoinedValue("foo", ", "), "bar");
assertEquals(map.get("foo"), Arrays.asList("bar"));
assertEquals(map.getFirstValue("baz"), "foo");
assertEquals(map.getJoinedValue("baz", ", "), "foo, bar");