/**
     * Calculates the expiration time in milliseconds from the current time.
     *
     * @param days the number of days from now when the item should expire
     * @return the expiration time in milliseconds since epoch
     */
    protected long getExpiredTime(final int days) {
        final long now = ComponentUtil.getSystemHelper().getCurrentTimeAsLong();
        return now + days * Constants.ONE_DAY_IN_MILLIS;
    }

    builder = builder.addAll(headersOf())
    builder = builder.add("", Date(0L))
    builder = builder.add("", Instant.EPOCH)
    builder = builder.set("", "")
    builder = builder.set("", Date(0L))
    builder = builder.set("", Instant.EPOCH)
    builder = builder.removeAll("")
    val get: String? = builder[""]
    val headers: Headers = builder.build()
  }

  @Test