@Test
  public void shouldJoinChunks() {
    List<String> chunks = Arrays.asList("chunk1", "chunk2", "chunk3");
    String delimiter = ",";

    String expected = "chunk1,chunk2,chunk3";
    String result = StringUtils.join(chunks, delimiter);
    assertEquals(expected, result);
  }
A dummy key which is longer than allowed.
src/test/java/net/spy/memcached/util/StringUtilsTest.java