@Override
    public Object get(String key) {
        return this.map.get(key);
    }
@Test
    public void keyWithDifferentCase() {
        map.put("key", "value");
        CamelMessagingHeadersExtractAdapter adapter = new CamelMessagingHeadersExtractAdapter(map, true);
        assertEquals("value", adapter.get("KeY"));
    }