map1.put("key1", "value1");
        assertEquals(1, event.toSource().size());

        // Replace the map
        Map<String, Object> map2 = new HashMap<>();
        map2.put("key2", "value2");
        map2.put("key3", "value3");
        event.setSourceMap(map2);
        assertEquals(2, event.toSource().size());
        assertFalse(event.toSource().containsKey("key1"));

        final Map<String, Object> map = newHashMap();
        map.put("aaa", Integer.valueOf(1000));
        final Map<String, Object> map2 = newHashMap();
        BeanUtil.copyMapToMap(map, map2, converter(new NumberConverter("#,##0")));
        assertEquals("1,000", map2.get("aaa"));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testCopyMapToMap_converter2() throws Exception {

  /**
   * <a href="https://tools.ietf.org/html/rfc3745">JP2K image format</a>.
   *
   * @since 28.1
   */
  public static final MediaType JP2K = createConstant(IMAGE_TYPE, "jp2");

  /* audio types */
  public static final MediaType MP4_AUDIO = createConstant(AUDIO_TYPE, "mp4");
  public static final MediaType MPEG_AUDIO = createConstant(AUDIO_TYPE, "mpeg");

  /**
   * <a href="https://tools.ietf.org/html/rfc3745">JP2K image format</a>.
   *
   * @since 28.1
   */
  public static final MediaType JP2K = createConstant(IMAGE_TYPE, "jp2");

  /* audio types */
  public static final MediaType MP4_AUDIO = createConstant(AUDIO_TYPE, "mp4");
  public static final MediaType MPEG_AUDIO = createConstant(AUDIO_TYPE, "mpeg");