@Test fun formatTime() {
    assertThat(formatDuration(-3_499_999_999L)).isEqualTo(" -3 s ")
    assertThat(formatDuration(-3_000_000_000L)).isEqualTo(" -3 s ")
    assertThat(formatDuration(-2_500_000_000L)).isEqualTo(" -3 s ")
    assertThat(formatDuration(-2_499_999_999L)).isEqualTo(" -2 s ")
    assertThat(formatDuration(-1_500_000_000L)).isEqualTo(" -2 s ")
    assertThat(formatDuration(-1_499_999_999L)).isEqualTo(" -1 s ")

    if (loggingEnabled) {
      val elapsedNs = queue.taskRunner.backend.nanoTime() - startNs
      if (completedNormally) {
        log(task, queue, "finished run in ${formatDuration(elapsedNs)}")
      } else {
        log(task, queue, "failed a run in ${formatDuration(elapsedNs)}")
      }
    }
  }
}

private fun Logger.log(
  task: Task,
  queue: TaskQueue,
  message: String,
) {

    }
    task.nextExecuteNanoTime = executeNanoTime
    taskRunner.logger.taskLog(task, this) {
      if (recurrence) {
        "run again after ${formatDuration(executeNanoTime - now)}"
      } else {
        "scheduled after ${formatDuration(executeNanoTime - now)}"
      }
    }

    // Insert in chronological order. Always compare deltas because nanoTime() is permitted to wrap.

  </function>

  <function>
    <description>
      Returns formatted duration from a given value.
    </description>
    <name>formatDuration</name>
    <function-class>org.codelibs.fess.taglib.FessFunctions</function-class>
    <function-signature>java.lang.String formatDuration(long)</function-signature>
    <example>
      ${fe:formatDuration(1234)}
    </example>
  </function>

  <function>
    <description>

     * @param durationMillis the duration in milliseconds
     * @return formatted duration string (e.g., "2 days 14:30:25.123" or "14:30:25.123")
     */
    public static String formatDuration(final long durationMillis) {
        return DurationFormatUtils.formatDuration(durationMillis, "d 'days' HH:mm:ss.SSS").replace("0 days", StringUtil.EMPTY).trim();

    }

    /**
     * Formats a number using the specified pattern and user's locale.