@Test
  public void shouldWorkWithEmptyOrNullStrings() {
    assertFalse(StringUtils.isJsonObject(""));
    assertFalse(StringUtils.isJsonObject(null));
    assertFalse(StringUtils.isJsonObject("\r\n"));
    assertFalse(StringUtils.isJsonObject("\n"));
    assertFalse(StringUtils.isJsonObject(" "));
  }
A dummy key which is longer than allowed.
src/test/java/net/spy/memcached/util/StringUtilsTest.java